Manned submersibles

. te ball ]
Sar aah . oe 4

- y) sai < i

- q -
pin = s JE
bene FT aa. : yy

/ % g
i if

>

aot

ee |
a,

f TbheS?O00 TOEO oO

MICE 0

1OHM/T8IN

Woods Hole Oceanographic Institution

ate ibrar
Data Library

Reference Collection

MANNED SUBMERSIBLES

BY
R. Frank Busby

OFFICE OF THE OCEANOGRAPHER
OF THE NAVY

1976

. - . :
ROBERT PALMER BRADLEY

September 3, 19830—November 28, 1973

Had I the chance to peel away the years and once again decide which path to follow, it would be
towards the sea. I would do this for two reasons: Because it is a most intriguing subject and the most
intriguing people are met on and under its surface. Bob Bradley was, what I can only call, a delight
and a rare privilege to know. He possessed a sharp, sly sense of humor, a pioneer’s sense of adventure
and displayed a scholar’s interest in the oceans. Naval aviator, commercial diver, submersible pilot and
graduate in marine biology are not credentials one would expect from a son of the prairies. But in a
quiet, certain, almost casual manner, Bob dealt as easily with the deep oceans as he would have the
wheatfields of his native Kansas. He was quick to befriend, perhaps too quick, for the waters he felt he
knew and understood claimed his life at 219 feet in Douglas Channel, British Columbia. I miss him; so
do the other friends he left. In a very real sense, an earlier pioneer of the deep oceans, William Beebe,
described our loss.

“When the last individual of a race of living things breathes no more, another heaven and another
earth must pass before such a one can be again.”

R. Frank Busby
Arlington, Virginia
January, 1975

FOREWORD

History records evidence of insatiable human curiosity about our
world. But it was a more urgent need than curiosity which tempted
early man to look beneath the surface of the sea and test his limits of
endurance. He went in search of natural treasure to augment his hard-
won food supply and for naturally occurring materials that were useful
in a primitive, comfortless routine of living. Limits were quickly
reached in his invasion of the ocean depths, and all that lay beyond was
called mysterious, remaining unapproachable without some form of
protection against hostilities destructive to the fragile vehicle of hu-
man life.

Twentieth century technology has cleared the pathway for safe
passage through those deep sea hostilities for an invasion of the
marine environment unparalleled in history. A growing host of varied
undersea vehicles is entering the ocean’s depths in missions of science,
engineering and exploration for industrial opportunity, as well as for
the satisfaction of simple curiosity.

The U.S. Navy is required, by the responsibilities of its mission, to
operate throughout the entire ocean environment. Those responsibili-
ties, in turn, impose requirements for knowledge about our operational
environment and technology that will operate there, effectively. In
order to gain knowledge of the deep ocean and its influences upon
naval operations, we have to go there. One way to go there is to send
tools which function as extensions of man’s senses and work capabili-
ties. But, even though modern technology is helping us to develop
increasingly refined instrumentation and methods for perceiving the
nature of the ocean depths, there are observations and conclusions
which cannot be achieved without the benefit of man’s highly devel-
oped sensory capabilities operating in the immediate vicinity of investi-
gation and work areas.

It is the manned submersible which offers us the opportunity to be
on the scene and perform tasks in a relatively comfortable and secure
environment at ocean depths or locations which would otherwise be
destructive to human life. The Navy has developed a small family of
manned submersibles to investigate the deep ocean and to perform
various kinds of work included in the Navy’s mission. We are also
interested to know what others have done in the development of
manned submersibles, because each effort in the field is helpful in
solving problems of how to work most effectively in the deep ocean
environment.

Our Nation ... indeed, the whole world ... has demonstrated
renewed interest in developing the technology and the methods neces-
sary to begin harvesting natural resources from the sea, in quantity.
Amateurs as well as professionals are at work to design and build
vehicles of one kind or another which will permit useful work in the
ocean. Progress toward those goals is assisted by sharing both suc-
cesses and failures in development efforts. The problems of reaching
those goals are based on the difficulties of creating technology that
works in the deep ocean. But the problems are basically the same no
matter what kind of work is contemplated so a sharing of them and
their solutions works to speed progress for all.

ili

Because of escalating interest in what is required to accomplish
useful work in the ocean environment, questions are being asked about
manned submersibles: How do they work? Are there laws that govern
their construction and employment? What are they capable of doing? If
they are involved in an emergency what can be done to assist them?
What are their limitations and their capabilities? Mr. Busby has
compiled a comprehensive review of the development and operation of
manned submersibles, providing the marine scientist, engineer and
surveyor ...as well as the uninitiated explorer of the ocean depths...
with many answers to questions about these unique vehicles.

It is the Navy’s intent to encourage a wider and more productive
exchange of information concerning the requirements for performing
useful work in the deep ocean and information about recorded achieve-
ments in design and operation of manned submersibles. Mr. Busby’s
efforts in collecting and presenting the information within the follow-
ing pages have contributed greatly to such exchanges among present
day and future participants in ocean programs that we all hope will
some day deliver, to a waiting world, a realization of the age-old
promise of resources from the sea.

Rear Admiral J. Edward Snyder,
USN

Oceanographer of the Navy

ACKNOWLEDGEMENTS

My sincerest appreciation is extended to CAPT Edward Clausner, Jr.,
USN (Ret.), formerly of the Navy Material Command, who found the
time to listen to my pleas for support and, subsequently, provided the
resources to fund this effort. He reviewed several of its chapters,
opened many doors to information and, finally, still manages a smile
after one and one-half years of near-continual pestering.

Secondly, my thanks and appreciation are tendered to CAPT Jack
Boller, USN (Ret.), now Executive Secretary of the Marine Board of
the National Academy of Engineering. CAPT Boller’s support and
advice were instrumental in seeing this work reach fruition.

I am indebted to Rear Admiral J. Edward Snyder, Jr., USN, Oceanog-
rapher of the Navy. His kindness and hospitality in providing me with
working space and office facilities, during my tenure with CAPT
Clausner, was boundless. I am further indebted to Admiral Snyder for
allowing me to use the name of his office in the many requests to
private and government institutions for information.

Although he was not directly involved with the preparation or
funding of this work, Mr. John Perry, President and founder of Perry
Submarine Builders, has contributed to its content since 1965. Through
his gracious hospitality, the Perry staff, their submersibles and shops,
have been my practical primer for almost a decade. In the course of
this education, Mr. Perry kindly and indulgently stood by while I
stumbled through the frustrating process of finding out what wouldn’t
work underwater and managed to keep a straight face while I attached
the latest in undersea navigation devices: A bicycle wheel, to his PC-
3B. In the course of such neophyte shenanigans, Mr. Perry has
persevered through some difficult times to place manned submersibles
in the category of practical and useful ‘‘work” boats, rather than
expensive engineering toys.

Some 4,000 miles to the northwest of the Perry shops is the firm of
International Hydrodynamics Ltd. (HYCO), founded by three commer-
cial divers, Mack Thompson, Al Trice and Don Sorte, of Vancouver, B.C.
Likewise, these three opened their shops and files to me and provided
any and all information on their PISCES class submersible. In particu-
lar, I would like to express my appreciation to Mack Thompson, a
practical, imaginative, ingenious, submersible designer and manufac-
turer who responded to every request of mine and made the time
available for me to participate in dives on the PISCES III. The
hospitality of the HYCO staff made every visit to Canada a rewarding
and memorable occasion.

Now, my reviewers, E. W. Seabrook Hull, as my editor, reviewed this
manuscript and restructured the narration to the English language
and the reasoning to that of a relative sanity. Mr. Lloyd Wilson of the
Naval Oceanographic Office took on the laborious chore of reviewing
the first proof print. With patience and skill he corrected the hundreds
of inconsistencies and spelling errors while imposing a sense of disci-
pline to an exceptionally rambling narration. The following people
kindly and most thoroughly reviewed individual chapters for technical
accuracy: CAPT R. K. R. Worthington, USN, (Ret.), the DEEP QUEST

Submersible System Operations Officer; Mr. Jamie Farriss, Office of
the Oceanographer of the Navy; Messrs. Larry Shumaker, and William
O. Rainnie, Jr... WHOI; Mr. William Greenert, Naval Material Com-
mand; Messrs. Ronald Proventure, William Louis, and Gary North,
Naval Ship Engineering Center; Mr. John Purcell, Naval Ship Systems
Command; Dr. R. C. Bornmann, CAPT, USN, Bureau of Medicine and
Surgery; Mr. Martin Fagot, U.S. Naval Oceanographic Office; Mr.
Matthew J. Letich, American Bureau of Shipping; LCDR Ian Cruick-
shank and LT Richard Peyzer, U.S.C.G., and Mr. F. D. ‘“‘Don”’ Barnett,
Perry Submarine Builders.

I am particularly indebted to John Purcell and Don Barnett. In the
face of numerous and frequent requests for data, photographs, advice.
and explanations, time and again did Mr. Purcell produce precisely
what I needed or led me to individuals who could and did. Drawing on
Mr. Barnett’s wide range of experience with TRIESTE I, the STAR
vehicles, ALUMINAUT and the Perry vehicles, I received an education
in the operating and design philosophies of both private and govern-
ment submersible activities.

A host of individuals provided information and photographs of their
submersible design and construction; specifically the following were
most helpful and patient in dealing with my many requests: Douglas N.
Privitt, General Oceanographics; Terry Thompson, T. Thompson Ltd.;
Donald Morcombe, Horton Maritime Exploration, Ltd.; Donald B.
Bline, Westinghouse Ocean Research Laboratory; Donald Saner, Lock-
heed Missiles and Space Corp.; Robert McGratten, Electric Boat Div.,
Gen. Dyn. Corp.; A. Pete Ianuzzi, Naval Facilities Engineering Com-
mand; William C. W. Haines, All Ocean Industries Corp.; CAPT Edward
E. Hennifen, Officer of the Chief of Naval Operations; CDR Robert F.
Nevin, USN and Joseph R. Vadus, Manned Undersea Technology
Program, NOAA; Dr. Andres Rechnitzer, Office of the Oceanographer
of the Navy; Roger Cook, Operations Officer, JOHNSON SEA LINK;
Paul Dostal, Alvin, Texas; John La Cerda and Mike Witt, Perry
Submarine Builders; Donald Johnson, Naval Ship Systems Command;
Thomas Horton, Living Sea Corp.; Robert Watts, Naval Undersea
Research and Development Center; Burtis L. Dickman, Auburn, Ind.;
C. Richards Vincent, Houston, Texas and D. W. Murphy, Hawaii Lab.,
Naval Undersea Center.

The majority of illustrations were reproduced from various transac-
tions of the Marine Technology Society’s annual meetings; in this
regard I would like to express my appreciation to the Society and Mr.
Robert Niblock, its former Executive Director, for granting permission
to reproduce its material.

Information on non-U.S. submersibles was mainly obtained by writ-
ing one or several individuals from various countries who found the
time and patience to answer another of the many “please tell me all
you can about” letters that owners and operators of submersibles
receive. My gratitude and appreciation is extended to the Kenneth R.
Haigh, Admiralty Experimental Diving Unit and G. S. Henson, Vickers
Ltd. Shipbuilding Group of the United Kingdom; LCDR Rod Smith and
LT Paul LeGallis of the Canadian Armed Forces; Dr. Alexander Witte
and J. Haas, Bruker-Physik AG Karlsruhe, Federal Republic of West
Germany; Dr. Jacques Piccard, Lausanne, Switzerland; LCDR Masa-
taka, Nozaki, Japanese Maritime Self Defense Force and Dr. Tamio
Ashino, Japan Ship’s Machinery Development Association.

vi

Finally, we enter the trenches, which, in this case is manned by
typists, illustrators, and photographers. My appreciation is extended to
Mr. Dick Moody of the Office of the Oceanographer of the Navy, who
waded through the morass of governmental contracting to somehow
see all the illustrations through to timely and accurate completion. Mr.
Carl Mueller, also of the Oceanographer’s Office, performed all photo-
graphic reproductions and processing and still exchanges hellos after
my countless changes of mind, format and requests for processing. Mrs.
Becky Murray, another OCEANAV employee, had the questionable
honor of typing the final drafts of this manuscript and did much to
impose a degree of consistency and order to a most incorrigible subject.

The photographs which appear with NAVOCEANO (Naval Oceano-
graphic Office) credits were taken by members of its Deep Vehicles
Branch which functioned from 1966 through 1970. During this period,
in which I was the nominal head of the Branch, its members contrib-
uted not only photographs, but a wide variety of practical expertise
and critical observations from which I drew heavily to display my
“expertise.” Specifically, I am grateful to Roger Merrifield, Joe Pollio,
Mike Costin, Larry Hawkins, Pete Bockman, Tim Janaitis, LeRoy
Freeman and Dick Young for their years of patience and enthusiasm
while I fumbled through the alleged role of “Leader.”

My final thanks and gratitude are to Miss. Jean Michaud, my
anchorman. Typing the first hand-written chapter as a favor, her
involvement grew to providing all subsequent typing and the necessary
nagging to keep the work going when the task seemed unending. Her
help, encouragement and loyalty were direct contributors to its timely
completion.

- eS eo
g >= pel Pert
4 - AD &> $ 0685 1914.07
Md - - ——@ <7 Gee ey
a = ay =o We
‘ : Seog @) eiWow —abais
ie™=) » & a Gene 2 ang Cam = ay age yu
ae —_ 2 eae § _ ©
ae, ib patti Mite 4) Gk awe amas) eal.
oS 1 =a oa = Z ee aeet
d nt “|e oO 2 e « tras Ge
rs pak i Ce aren Jihad: .\ 440 he GD
=e Pa eS wy UWP S44 © Orbs.) nore
= 1 Peru pas Gulla 2a reer OG
ae oe) area ty6 sl¥wee Lid.
ru a. ee ee Sa eee) ee | eee
PG Sse) LA, (0) Pee Ge came ivstc debs idetp
0d ai hd BF V4) oe of” 1. mm Oop ee) = pjogsgrt

hin We ‘ ti eee cod loser 5 © 1> ban (ial oa

o@eee- ie lie! eae eee Last en

aed a es a folie oo

» > Gee 019°. aylegrans “aa
to Ae Nee hoa Filaqh) al Os etnies

Woy a9 71U lor = Ge) ete Oe.
CAGE? °n eso EP GY (se eee,

m2 YW Gane) 6 fre =e 104

Lhe 7 >in 6 ae et
* . 7 7 en
_ or@ is J a $<¢ea
m _ - — _ mile
7 @! Gee i a
é ® q 2a 4g
i 2 ’
- z it
oe
9G °
4
e¢F
>

ee ec
>
7
_ »
<
>
y a
-
7
, : ¢
7
- U
-_

TABLE OF CONTENTS

Dedication
Foreword
Acknowledgements
fl, WON/ARTRXOVD OCG AMTICO UN a te as ee ee ees Seen eke if
Mannedisubmersibler Defined ig eta ee a oe ee ee eee 5
PASE eC] clit Eyl Cee ee ee ee ee eee 28 ee es oe eee eee 5
Wel clens Galt US umes wane eaten ee ee ee ee a 8 ee 6
herminologyaandeU mits am eee a Mere eet ae earl ee es ee 7
Generaleanduspeciticuaublicationsiof Interests ae een ee ee eee 8
Somes Bloe Silloth: (a aa es ee ee ee ee eee ee 10
mheMannedeAspectofssubmersibles) 22022222 se Se 10
2, DESIGN AND OPERATIONAL CONSIDERATIONS ______-_-_-___-~_______--__-_-_ + 13
EnvironmentalaConstralnts cuss See re eee Se ee ee Pe 14
Wehicleshertornmancesequinements) (22.25 5-20 as ee ee 16
FUT aTRC ONSTCE GALTON S eee ees we a ee 18
Hmerrencvabroced ures ap sass. kaka eee Sea ae Se ee ge i Se es ee 19
Supportahequinements ses ees) S es Be re eee ee ee ee 19
he DEER GUEST. Submersibley System os ee ee 20
SEE CONDEMPORARYE SUBMERSIBLE DEVE LORME NIL 22 31
Bathyspherestoss athy sca p lime ee ee ee a ee a ee 32
VCoe aT OS to ECE!S ThE Perce a a Se ee ee ee 42
Oceanographic ChimatetofitheyMid= Sixties esse ee ee 48
WeniclespiomAnysOccasion (ses —6 oe ee nae 2 ae a ona eee ed 51
AS MVoreiConsenvabivierApPLOach=—— ine wl 9/10) spss ee 64
AP VEAININIE RS US VER ROS LB RS 919482194 eee ee 75
Dimensional/Rertorm an Cele rns eee ae eee eee ee 76
Component/Sub=-Systemplherm Sa 2 sas ee eee ae ee aed a a ee ee ee 76
SubmenrsiblessDescribecdimeesse- ee sees = ie ee a ee eee 86-240
5, TER OSISNO RID BUGGIES ANID) Sp. COSMU ROCA) a 241
PSE CSS UCB EU S puememmeaere Sees mame Saree hae Be Raa ee ee Ser ee ee ee 241
Saye S gee Senet ern eee ee ge oe ee oe SO eee oe ee ee ee 241
Material sees setae: ree ieee s Sunes See Pi eT eee ee ee ee 247
ES UPD TT CeAtL Wk i i i Te Sg a a ec 250
vil BB enetra tions ase oe 2 ese ee ee ee 255
EStennalts bRUCCURCS samen oan cnet oe Ses ee Oe a eee eee 263
EXOSCEUCEURC Set Seen eee ny pe ee Be ee ee ee eee 263
ELAN o's eee Meek cr ne Ce een LB Ae. eas AR ee ee ee 265
ressureeNes tin Paes ae wee Pl SE ee ee ee ee ee 266
BressuremhestehiciGliltie spe mene teen ae ets ee ae ee ee ee 270
TessunereullaVleasume meres TiC ike sts yee ee ee 271
BCOrrosioncanagltss Control y= 28 2. 8 se == ee a 275
Cee AIGIGA STUNG ANDI TRRIMCSYSIREMS) | 2222-22222 ee ee 279
iWeirhtrandavolumertstimatesmea soe. esl ot eee) ty aes ee ees See fs eae 279
@ompressedpAinandsWeballasting wy) (25 = == set ee 282
Ballastin gas yS tems tae wee an eg st UNS ee cee ee ae ee ee 285
IRS SN.S LENT S eee ane mien hae eae ne SEE Cs SA Se ete sn, See ee 301
(A LOWEREAN DALES DLS TRIBUTION! 22 A. ee ee 309
Manual lowe nanometer seer ae, eee nt en i Ses ee ts ee ee ES 309
Bare TIAA GLC HAO We Te eee eee re ee ee ee Fe ee 310
ELE CEr CREO We Te ee ee ee ee en ed ee Bee, te eee 310

ix

Battenes: =<...) Si ere eae et _ e s , 319

RuelGells: ...-. 5 ee ee DS . ee ee ee eee 331
NucléarJPo we n/a pmeree aee e E in Te a Ee eee 334
Gable-To-Surrfacenm pete ee eee ee 334
WTS SELES CC ve ep a a ea ae 336
Power Distributiong se 8-6-2 we ee eee eee 338
Penetr ators ype eee en ae peers cee ee ee 338
OTA TE CEO TS ip et ek ee a SP 345
(Gallo les ae ht rats 6 8 cg ee pl LORY: al ng a gtr bes ea = IN A 351
Jumcetione Boxes) «222s = eee ee ee 355
Imterferencer sete ee 2 A Se ee ie ee ee ee 361
85 IMANEUMERABIEITY AND CONTROL. 222 2S Eee 369
Propulsion! 92aee 2 2o ease oe Se i LO ee ee ee By Al
Maneuvering 2222 2-2 2 see eee ss Se ee ee eee 381
IMIGtOTS eects ere at Pee at ho en oA ee Ed ee eee ee 388
DT AoA OVCES ne ten or et oe eg See oe whee le A | ES Dia 392
Propulsion*’PowersRequirements» 2222-22222). 2 SOS eee 395
Controls Devices: 22-4 ae ee Sey Pe Par TE eS 397
oS hike SUPPORT-AND HABITABIDUIY: 2 EEE EEE eee 409
Isife Supports se Soe or re ee en 409
Replenishment. 2222222002 eee ee Ss eee 412
Removal: os een ee OO a A 419
Control) ae 5 res ee a ee ee eee 428
IMOnItONIN Gg) sss. 26 oe a es oe No oe Se ook eee 430
PhilosophicalbApproach wo222s.22s22cso Soe esos We ee eee 437
Ss Ore es A oe ae ed se eee 438
IBENORRANKLIN QF 222) Be eee Ae eee 438

FS ital ity hepa re ale Se Bo Se 449
Psy chologicallsAspects). 2.2 2 ae ee eee 463
10. OPERATIONAL EQUIPMENT, NAVIGATION, MANIPULATORS ______-___--_______-______ 467
BQUIp Ment” <..e2e2 oes ene oe Hh ee ee ee ee eee 467
Bnvironmental: 222222 22ssu S222 ss See ee ee eee 468
Depths a. 8 a2. oe a et ee a I el 481
SPeGd 2s Soe 2 Foote oF Te ee oh ae a 487
Pitch(Roll) 2222s .22see 2c 22 oes 2 ee a oe eee 488
Communications: -—-- - =. eS ee ee eee 488
INSVIPatON (25.5 a ee ee ae ee ee a ee eee 494
Surtace(Drackitigw 22262. oe eed ee ee 496
Submerged Navigation. 22.2.222220 22 eee 503
Homing? << ae Se oe ae 512
Manipulators: «:25-22s-5 Sos20 oi oe ee eee 519
POWER 2s as ae Oe ee es a ye ee ee 523
Desion/capabilities: 2-2-2 2te 2 ee eee eee 525

Cla WS oes a2. bes sot eek er ee eee eee 531
GontTolis 22226. ~oe eee on oh ee eo oe a eee 531

He sSCIENTMDIGCAND WORK @ UIE MibIND. 2222 ee ee ee eee 537
Constraimtsions Submersible lias tr Ure rit see ee ee a 538
Survey Instruments 22 = 2s ae pe ed gee 544
Researchwlnstruments)-=22.-- ne eee ee 556
Eneimeenne/Inspection/Salwvage: sels 2= sss = ee 557
12> “SHA-AND SHORE: SWPPORMT 22223 2 2k ee ee ee 577
Transportation =< =2. 2. S-. 2222 e soe hes ee eee eee 577

Sup POs AULOLIN Ss eens ae ee tee On oer eS Se 2S ee 581

WaunchiketuevaleVlethod sams eee siete ee pe oe es ee eee 592

Way WSS, eh aaa i a a ee 596

(Corree yy Guess eee ene ee SO ee ee se ee ee 606

Tete EL OO KS pee nen eee Sera ee Serene ee a ee eo ee ee 615

OO Will] eee ene ene eens Wieenae eee) et he Fe ee eee et ee 616

Parsomnal aracl Snore evens. 2-252 617

13. CERTIFICATION, CLASSIFICATION, REQUIREMENTS ____--------_---__--____________ 623

Rotentialetaziands weer se Siew oe oe eet se ee ely 3 ye SL 626

Sy stemmblaz ands 55 sa s2 2 ee ee ee eee 2 eS eee 626

Matenaleand sub-system peal ures) aes ee eee 626

Imstrumentwbeall Wess. = eee on et ee eee ee oe 627

Oyaereatiore JO ET Tees see ee eee ee 2. RM es eee Se ee oe ee ee 627

WMaunchiketrievaleMarlure spt se os! 55 0D ie ee eee ee eS Se ee 628

Environmentalublazards: 22m 26 26 oe ee ee eee 630

ING uit eees bese Dat oral oan SS Ue es Se St ee ee ee Ree 630

Memn=Wiad caps ste sek 2 RN be ee Se ee ee eee 632

WESaNavvaCertificationy. S22 eke Boe | ee ee 636

MatenialeAdequacy. 0 eee. $e LS ee eee 637

Operator Competency, amen 22 020 ee eee eee 642

Operational Satety: <= seemeeees ee 5) eee eee 644

Americans Dune aulotes hip pingen Glas sili Cay tl Orn See eee ee ee ae er nn ee 644

WeSeCoast: Guard Requirements: 22-2 ===" i ee eee 646

Seanchrandulvescueuhesp on silo iit yams mee ee 647

IVIGAVER SAU eee Seneca. 0 gr me a ee ee ee ee ee 647

MAS UTE] CO we eee ee ee inne nL eee Ds re ee eee 648

14 TEM ODE TRIN IDDNWAKOIOS) ANID TOYO AID DIS) ee 651

HimercencyeAvoldance SystemSa qess ee =. 8 ee ee _ 651

Emergency Corrective Systems (Submerged) ___--___-_______________________________-- 659

EAMES E SM CHa SVS UE NISMS UIs fren Ce Cl) seme tna at on yn a ee ee 670

Dewees to ANSBIe Winclennanirare INGO 2 ee 675

15. EMERGENCY INCIDENTS AND THE POTENTIAL FOR RESCUE —_____________________- 685

InCid @niGS hae eae SE ee ee ee ee ee Oe Pe ee een 686

IREROUE leuemincl_ incline AINSI ee ee 695

DEEP SUBMERGENCE RESCUE VEHICLES _________-------------------_- 695 & 698

Swolonmewabas Iesene CMigyinloere 2 695 & 699

RESCUE INorermtpeL | Rermavenyell se 700

ArmibientyDivienSwaee see ne 28 ne Sl De ee ee Pe ee are ee ey ee 700

MiammnedeStilbmensilole sae oo ce aren ee ele eh eee 703

Wirnimeanmeciave icles ye — ee ae Ea ee ee ee ees Se eee 703

TD ma Ve DSS ane ty ae A a we Es ee a ee 706

PESCEStiieincident: 2200 l= 6 = es Be a ee 707
APPENDICES:

IE @onwersi ons actors pee 5s ne Ee ee ee ee ee 713

IAG S LOTTE TEST MVE tai Cl ems cate bynes a 724

Mite SAO E Rea bre-vand.eost-Dive Checklist, 22-2 s asa eee 730

GROSSARYORFACR ON MMS VAN DETER MS set ee ee 733

(CORB OR ADE RIN D) Xeon eran es eee EN er ee ES ASE are Dae Sk ele ee es ee 738

SHOTS UES Cie ING) BE XGgee tare betnener ves Beek Shee e Er ee es i A ok Vee ENS ee ee 741

ANIDID SINTON Dae a ee Eee re ee Oe ae ee ends Poe, 4 OLN Reg RS EEE 763

xi

INTRODUCTION

Some four centuries before the birth of
Christ, Aristotle wrote of small “diving bells”
used by sponge divers who regularly worked
at depths of 75 to 100 feet. The bells were
inverted bowls weighted down by stones. The
divers would stick their heads in them to
replenish their air without surfacing. The air
in the bells, in turn, was resupplied by
weighted skins filled with air and lowered
from the surface.

In 1620 A. D. a Dutchman, Cornelius van
Drebel, is said to have constructed a sub-
mersible under contract to King James I of
England. It was operated by 12 rowers, with
leather sleeves waterproofing the oar-ports.
Cans containing some ‘secret substance”’
(soda lime?) were opened periodically to pu-

rify the air. It is said that the craft navi-
gated the Thames River at depths of 12 to 15
feet for several hours.

In 1707 Dr. Edmund Halley (of Halley’s
Comet fame) built a diving bell with a limited
“lock-out”? capability. It had glass ports
above to light the inside of the bell, provi-
sions for replenishing its air and crude, um-
bilically-supplied diving helmets which per-
mitted divers to walk around outside—so
long as they didn’t lower their heads below
the water level in the bell!

In the late 1770’s Connecticut Yankee Dr.
David Bushnell built and operated a small
wooden submarine designed to attach mines
to and blow up British warships. After sev-
eral abortive attempts, TURTLE, as the ve-

hicle was named, did account for one enemy
schooner.

In the early 1800’s Robert Fulton (inventor
of the steamship) built two iron-framed, cop-
per-skinned submarines, NAUTILUS and
MUTE.The former carried out successful mil-
itary tests against moored targets for both
France’s Napoleon Bonaparte and the
British. Neither craft was ever used opera-
tionally, however.

The first “modern” submersible—it could
be argued—was Simon Lake’s ARGONAUT
FIRST, a small clumsy-looking vehicle
launched shortly before 1890. Made of
wooden planks and waterproofed with pitch,
it was powered by a gasoline engine snor-
keled to the surface through a buoy-sup-
ported flexible hose, and it boasted blowable
ballast tanks—the first submarine to do so.
In addition, it sported powered wheels and a
bottom hatch that could be opened—after
the interior was pressurized to ambient—to
permit the hand recovery of bottom samples,
including oysters.

These are just a few examples of the long
history and the nature of man’s early tech-
nological efforts to function effectively
within the ocean environment. While Simon
Lake in the first part of the 20th Century did
develop a submersible salvage system, in-
cluding submersible barges, and managed to
recover a cargo of anthracite coal from the
bottom of Long Island Sound, the manned
submersible was not to emerge as a diverse
and functional means of accomplishing use-
ful underwater work for over half a century,
which brings us to where this work com-
mences.

In 1965 a delegation from the U.S. Naval
Oceanographic Office journeyed to Lantana,
Florida to evaluate John Perry’s CUBMA-
RINE as an undersea surveyor.

The “evaluation,” to say the least, was
cursory and strongly resembled a used car
purchase. The team (headed by the author)
gazed astutely at the tiny, yellow craft from
various angles, rapped its steel hull for
toughness, caressed its sides for smoothness
and sat inside to see if they fit. A few hours
later the team leader had the opportunity to
dive in the (now pronounced) “sound” vehicle
for an operational evaluation. The result was

predictable: One could see out of it, the seats
were hard and there wasn’t much room. But,
what else could the amateur do? Had it been
possible, we probably would have taken a
bite out of it.

Since the mid-sixties hundreds of scientific
and technical articles have appeared describ-
ing the design and materials of what are now
called manned submersibles. Several books
have been published that relate the activi-
ties of specific vehicles. As a result, the in-
dustrious student can—with patience and a
comprehensive library—become quite famil-
iar with the history, jargon, design and oper-
ations of submersibles and need not feel like
a technological ignoramus on his first en-
counter.

Unfortunately, as the new student soon
learns, there is no single point of reference
from which to begin an education. The infor-
mation is available, but it is so scattered that
merely accumulating an adequate bibliog-
raphy is a chore, and in the course of assem-
bling this data, the field itself is moving at so
rapid a pace that most vehicle descriptions
are in error within a short time of their
publication.

Adding to the consternation is the jargon;
many of the terms used to describe manned
submersibles, such as “trim,” “blow,” “vent,”
came directly from military submarines, but
“viewports,”’ ‘“‘mechanical arms,” “claws”
and other terms are unique to the submers-
ibles. Indeed “manned submersible” is not
used with consistency. “‘Undersea Vehicles,”
“Deep Research Vehicles,” “Deep Submer-
gence Vehicles,” ‘Mini-Subs,” “Submersible
Vessels,” even ‘‘Submarinos” are synony-
mous. So the quest for an introduction, even
a nodding aquaintance, may be detoured by
jargon alone.

On the other hand there are the partici-
pants of the field; though not blocked by
jargon, they have no ready access to the
technological advancements or even the cur-
rent progress in their own field. There is a
wide variety of technical and semi-technical
journals wherein bits and pieces of experi-
ence in, and advice on, submersible opera-
tions and the results of tests or evaluation of
components can be found, but the time it
takes to review the literature (even if it
could all be found in one place) is prohibitive.

Then, there is the student of maritime
history who will find excellent documenta-
tion of the early bathyscaphs and two or
three accounts of the later vehicles but little
at all on the techniques and design in the
field at large. Reference is made later in this
chapter to documentation within the field of
deep submergence. It is sufficient to note
that in terms of documentation the full-scale,
peaceful invasion of the ocean in the last
score of years was and remains almost invisi-
ble.

This is not to infer that the manned sub-
mersible is merely a historical curiosity. Doc-
umenting the ways of deep submergence
benefits not only the historian but potential
users and designers as well. If one is to use a
present capability or improve it and at the
same time avoid reinventing the wheel, it is
obvious that one must know the stage to
which it has advanced. In manned submers-
ibles the “state-of-the-art” is most difficult to
measure. For every question there are al-
most as many answers as there are submers-
ibles. One might ask, ‘‘of what are they
built?” The answer is steel, aluminum, plas-
tic, glass and wood. ‘“‘How deep can they
dive?” From 150 to 36,000 feet. “How long
can they stay under?” From 6 hours to 6
weeks. In short, to find the state-of-the-art,
one must look at the overall field. Where one
vehicle is lacking, another is not and where
one cannot perform a particular task as well
as another, it might very well outperform its
rival in a different job. Canvassing the entire
field to define each vehicle’s capabilities en-
tails a world-wide search, which few have the
time or funds to pursue.

It is to help solve these problems that this
book is written. Jt is an examination, analy-
sis and synthesis of the last 26 years during
which over 100 deep- and shallow-diving sub-
mersibles have been constructed and oper-
ated in many parts of the world. Within the
past year (1973-1974) utilization and con-
struction have literally skyrocketed follow-
ing a 3-year period during which submers-
ibles were, in fact, becoming historical curi-
osities.

At this point in time it would seem appro-
priate, therefore, to see where we’ve been,
how well we’ve done and where we are.

The future of manned submersibles is not

discussed beyond a description of vehicles
now under construction or about to be built.
Not that the future looks dim; on the con-
trary, it looks fantastic. But it looked fantas-
tic once before and then fell on its face.
Predicting or even speculating on the course
of future events in this area is a difficult
proposition. For example, while gathering
data for this book, a visit was made to Perry
Submarine Builders in March 1973. At that
time the Perry company had just released a
good number of its employees and was re-
trenching owing to lack of business. The
future, for Perry at least, looked rather
bleak. On a subsequent visit in April 1974,
the Perry workshops were a beehive of activ-
ity, and negotiations were underway to relo-
cate and construct facilities that could han-
dle the incredible volume of new business.

So, predictions on the future will be left to
the more courageous. Also omitted is any
effort to predict the application of new mate-
rials, components, instruments or power sup-
plies. What has been and is being done in
manned submersibles constitutes the pri-
mary subject matter of this work.

As one could anticipate, there are some
shades of gray, and they color vehicles whose
construction was started (e.g., ARGYRO-
NETE, DEEPSTAR 20000) but halted before
completion. Such vehicles are included be-
cause they are a part of history and repre-
sent the thoughts of various deep submer-
gence participants at that time. So, in the
engineer’s jargon, credentials to this book
are simply that steel has been cut.

There are other benefits to be gained in
looking backwards, if we look to the periph-
ery as well; the periphery being the activi-
ties or operational methods of others and
their approach to submersible diving. In this
respect the subject of safety and emergency
devices comes to mind. Chapter 14 relates at
some length the devices and equipment car-
ried on individual submersibles to avoid and
to respond to emergencies. This listing is not
presented with the inferred message that
the submersible operator “must” have all of
these provisions if he is to operate safely. It
is given instead, as something to be consid-
ered. A requirement for distress rockets, ra-
dio homing beacons and the like may be
overreacting for the submersible working in

Ss | &) RG).

1. Operator/observer 2. Pressure hull 3. Life support/controls

NS - @

4. Exostructure

7. Fairings/sail

Fig. 1.1 Submersible components

4

a dam or Lake Geneva, but if the same
vehicle moves its operations to the open sea
they then warrant consideration. _ hd

Likewise, there are the different ap-
proaches to ballasting, maneuvering, life
support and launch/retrieval. By reviewing
the many different means to the same ends,
the operator may find an idea or a different
arrangement to increase the capabilities
and/or performance of his vehicle.

There are, unfortunately, many stumbling
blocks in trying to categorize and force order
on such a free-wheeling, dynamic and wide-
spread activity. In some cases the subject
refuses to be pigeon-holed, terms must be
introduced which are arbitrary, modifica-
tions to the vehicle make near-current de-
scriptions inaccurate, and many loose ends
are left. To deal with these problems, this
chapter is devoted to alerting the reader to
the nature of such pitfalls, omissions and
inconsistencies. Other subjects will be dis-
cussed which, by their rebellious nature, are
only satisfied with a separate discussion or
by constant reiteration.

Manned Submersible Defined

To limit the scope of this book the following
defines a manned submersible: A manned,
non-combatant craft capable of independent
operation on and under the water’s surface
which has its own propulsion power and a
means of direct viewing for the occupants
who are embarked within a dry atmosphere.

This definition precludes underwater habi-
tats which have no independent means of
propulsion, swimmer delivery vehicles which
are not “dry” and diver support or delivery
chambers which are tethered to the surface.
By definition the tethered vehicles KURO-
SHIO II, GUPPY and OPSUB should not be
included, but here is another gray area. KU-
ROSHIO II and its predecessor KUROSHIO
I have been a part of submersible history
since 1960; to omit them would serve no
particular purpose and would deny their sig-
nificant role in undersea exploration. Having
made this exception, GUPPY and OPSUB
must be included by default.

Throughout these pages reference is made
to the “Submersible System;” this system
includes not only the submersible, but a ship
or surface craft to support it and an appara-

tus for putting it in and taking it out of the
water. Attention is drawn to Figure 1.1
wherein the submersible system is graphi-
cally portrayed beginning with its most basic
component: The human. The importance of
this “system” concept is dealt with in Chap-
ters 2 and 12.

A Field in Flux

In a certain sense this section should be
entitled “An Apology” because its message is
to warn the reader that the vehicle descrip-
tions in Chapter 4 are, to varying degrees,
inaccurate. There are two primary reasons
for these inaccuracies: 1) Many of the vehi-
cles are no longer in existence and both the
participants and the records often are un-
available for authenticating what data is
available, and 2) the dynamics of the sub-
mersible industry. The first reason needs
little else in the way of explanation, but the
second requires some elaboration.

Submersibles, like any other capital equip-
ment, can change owners, and a new owner
may change not only its design, but its name
as well. For example, the 1970 Perry-built PC-
9 (a Perry designation number) was originally
christened SURVEY SUB I by its owners
Brown and Root. In 1973, Taylor Diving Serv-
ices acquired the vehicle and renamed it TS-1.
Another Perry vehicle PS-2 was built in 1972
by Perry Submarine Builders for Access of
Toronto and was later christened TUDLIK. In
about 1973 the vehicle was transferred back to
Perry in Florida and reverted back to PS-2. In
1974 it was purchased by Sub Sea Oil Services
of Milan; its name has not yet changed, but
this may soon happen. Arctic Marine’s SEA
OTTER was originally PAULO I and belonged
to Anautics Inc. of San Diego. In 1971 it was
purchased by Candive of Vancouver, B.C. and
subsequently leased on a long-term basis to
Arctic Marine which renamed it SEA OTTER,
while upgrading its operating depth from 600
to 1,500 feet. In some instances the same
owner may retain the vehicle, but it dives
under a variety of aliases. For example Cous-
teau’s DIVING SAUCER is, to the French
reader, LA SOUCOUPE PLONGEANTE (this
name was also used at times in the U.S.), and
in the course of its history it was occasionally
called DENICE (after Cousteau’s wife), DS-2
and SP-300. In 1970 the same vehicle was

upgraded in depth from 300 to 350 meters and
became SP-350.

Such name changes have occurred with a
number of vehicles, and produce a quandary
concerning which one to use and what it is
now. Strictly for convenience, the names used
herein are the ones with which the author is
most familiar. The other aliases are given
under “Remarks” in the individual listings in
Chapter 4.

A change of owners generally produces a
change in the vehicle. Mention was made of
increasing the operating depth of SP-350 and
SEA OTTER. This is only one source of error
in any set of “current” descriptions. The origi-
nal.SURVEY SUB 1 or TS-1 had port and
starboard vertical thrusters mounted amid-
ships, the “new” TS-1 has shock absorbers
where the vertical thrusters once were (they
are now fore and aft). It also has increased life
support duration, a different lift padeye, and
an expanded suite of operating and surveying
equipment. This is only one of many examples
where the vehicle has changed by virtue of a
new owner, new tasks or different operating
philosophies. In regards to changing operat-
ing philosophies, the first five or six Perry
vehicles used Baralyme as a carbon dioxide
scrubbing chemical. Now Perry uses lithium
hydroxide and has replaced the Baralyme in
some other earlier vehicles with lithium hy-
droxide. In some cases almost the only thing
remaining from the original vehicle is the
pressure hull. AUGUSTE PICCARD, for exam-
ple, is described herein as it was when first
constructed. It is presently undergoing exten-
sive modification for open-ocean surveying
and except for the pressure hull and propul-
sion, will bear little resemblance to the origi-
nal.

In other instances inaccuracies are intro-
duced by virtue of changes occurring from the
vehicle-as-constructed to the vehicle-as-oper-
ated; those changes can be substantial. The
operating and design details of DEEP QUEST
in Chapter 2 were originally obtained from a
1968 description of the vehicle. Mr. R. K. R.
Worthington, DEEP QUEST’s Operations
Manager, kindly reviewed this chapter and
made numerous and critical changes to reflect
DEEP QUEST as it now operates. Where a
particular submersible has always operated
for the same organization and under the same

individual, such changes have been relatively
easy to identify. But, when it has changed
hands or the principals involved in its opera-
tions and readiness have been replaced (as is
the case with the military submersibles), it is
a research project in itself to ascertain the
many modifications which have taken place
on merely one vehicle.

In short, the descriptions and operating de-
tails of the submersibles herein reflect them
at some time in their life—though every effort
has been made to be as up-to-date as possible.
Dimensional characteristics, such as length,
height and width, weights, operating equip-
ment, safety devices, propulsion arrange-
ments and other features are all subject to
change which, except for those vehicles no
longer operating, is probably continuous. For
a first approximation the descriptions are
valid, but if precise details are desired, one
should contact either the current operator or
operating manager. In the course of the U.S.
Naval Oceanographic Office’s submersible
leasing program, it was quickly revealed
(sometimes with chagrin) that the marketing
arms of large corporations were quite often
ignorant of changes to the vehicle which the
operators performed.

Vehicle Status

It would seem to be a relatively simple task
to state what a vehicle’s status is—i.e., it is
either operational or not operational. But, in
reality, a vehicle’s status may be quite diffi-
cult to define accurately. ALUMINAUT is a
typical example. It is now in storage in Flor-
ida and has not dived since 1969. This does not
mean, however, that it cannot or will not dive
again. If a sufficiently profitable contract
were to appear for ALUMINAUT, its owners
probably would take it out of storage and put
it to work. PC-3B or TECHDIVER is another
example; it hasn’t dived for a number of years,
but again, under the right financial climate, it
undoubtedly could be induced to operate.
Some of the shallow vehicles, such as the
NAUTILETTE series, only dive in the summer
months when the weather on the Great Lakes
is amiable; in the winter they are in storage.
A few vehicles are on display in museums or
parks, others have been cannibalized to a
point where they are now in bits and pieces
and scattered in backyards. So, in some cases

it is quite easy to place them in either the
operating or non-operating category. Those
vehicles not clearly in either category are
classed as inactive. Specifically, the following
definitions are used in this work:
Submersibles which have been
reported diving in 1974, includ-
ing vehicles which are undergo-
ing test and evaluation and
those which are undergoing
modifications preparatory to
diving.
Submersibles which, within a 2-
or 3-month period or less, can
be made operational. ALUMI-
NAUT, GUPPY, OPSUB,
TECHDIVER are examples of
this category.
Non-Opera- Submersibles that are incapa-
tional: ble of operating without major
refitting.

Operational:

Inactive:

Terminology and Units

A number of the terms herein will probably
send the traditional submariner into a deep
depression. With over a half century of tradi-
tion behind him, the military submariner has
a ready-made field of jargon which quite ap-
propriately applies to the military submarine.
But, there is no traditional submersible and
the jargon which has grown around this field
comes from the aeronautical engineer, the
scuba diver, the machinist, the scientist, the
hobbyist and from the traditionalist himself.
This variety is not surprising: With virtually
all submersibles having been built and now
being operated by the non-traditionalist, there
is no uniformity in the terms used. This has
not been a handicap to anyone in the field and
is not likely to become one in the future.
Indeed, as far as tradition is concerned, the
operation of a manned submersible literally
violates every tradition of the submarine serv-
ice. Where bottoming or grounding a fleet
submarine is to be avoided in all but dire
emergencies, it is expected of submersibles.
Where every attempt is made to keep a sub-
marine’s lines hydrodynamically clean, there
is absolutely no desire or need to do so in
submersibles where speed is of little impor-
tance. A “long dive” in submersibles is 12 or so
hours, to the nuclear submariner this would
hardly classify as a dive. Then again, launch-

ing and retrieving a fleet submarine between
dives is not only unthinkable, it is virtually
impossible. So while the traditionalist might
blanch, most of the jargon he will find dis-
tasteful is that which is in more or less com-
mon usage. A few examples might be in order.
In some cases the term “brow” appears, this
is not a typographical error, some vehicles
(DEEPSTAR 4000) have a brow which over-
hangs the forward viewport; it is synonymous
with bow but with a specific kind of bow.

“Trim” is the means used by a submersible
to either transfer weight or rearrange dis-
placement forward or aft to incline the sub-
mersible’s bow up or down. Trim in a subma-
rine refers to arranging ballast such that the
submarine is buoyantly stable at a particular
depth. Occasionally the term “pitch” is synon-
ymous with trim in submersibles.

“Exostructure” herein refers to the struc-
tural framework external to the hull which
supports the batteries, propulsion units and
other components. Surrounding the exo-
structure may be a “fairing”? which smooths
out the envelope of the exostructure. Some
manufacturers refer to the exostructure as
the “framework” and fairings as the “skin.”

The term “operator” refers to the individual
who controls the movements of the submers-
ible and it is synonymous with “pilot.” Ini-
tially the term pilot was used and was quite
descriptive, but in the late sixties the U.S.
Navy introduced the term operator when it
invoked certification for the operator(s), i.e.,
pilots, of submersibles. As long as the term
operator has remained within the military it
served the purpose, but in the private sector a
submersible can be and quite frequently is
owned by one company, operated by another
and piloted by an employee of the operating
company. The dilemma, therefore, is apparent
when one speaks of the operator of the sub-
mersible, is it the firm or the individual? When
this confusion looms, the term pilot is used to
distinguish the individual from the firm.

Many other terms are used which are gen-
erally explained within the text, but the best
appreciation for the diversity from vehicle-to-
vehicle can be gained by noting the different
names given to components on the schematics
in Chapter 4. The names given to various
submersible components are those used by the
owners or operators. While it might be taxo-

nomically satisfying to relabel these compo-
nents with the same terms, one might find it
difficult to communicate with the owner
whose vehicle has been redesignated.

Finally, we arrive at units of measure or,
more precisely, the metric system versus the
English system. Quite evident is the fact that
nothing has been done herein to advance the
metric system. Recognizing the practicality of
it over the English system, the conversion of
the many values from the latter into the
former represents a job of considerable magni-
tude and leads to strange dimensions. A 6-
foot-diameter pressure hull would become one
of 1.83 meters and still not be an exact meas-
urement. So to simplify matters, where the
original data are in meters, it is so reported,
and where feet and inches are used, they are
given. And, as a final apology, a table to
convert the various units is included in Ap-
pendix I.

General and Specific Publications of
Interest

Throughout the text reference is made to a
variety of books, articles and reports dealing
with specific design aspects or operations of
submersibles. For the reader who might be
interested in only one vehicle or particular
components of submersibles, the following
books or reports, though referenced later, are
noted:

General Listings and Descriptions of Manned
Submersibles

Terry, R. D. 1966 The Deep Submersible.
Western Periodicals Co., North Hollywood,
Calif., 456 pp.

Shenton, E. H. 1972 Diving for Science. W. W.
Norton & Co., New York (describes the major
components of submersibles in non-technical
terms)

Penzias, W. and Goodman, M. W. 1973 Man
Beneath the Sea. Wiley & Sons, New York (a
recent listing which contains much technical
information, but leans toward the technical
aspects of ambient diving)

Specific Submersible Diving History and Design

Beebe, W. 1934 Half Mile Down. Harcourt,
Brace & Co., New York (construction and div-
ing history of the bathysphere)

Piccard, A. 1954 In Balloon and Bathy-

scaphe. Cassell & Co. Ltd., London (FNRS-2
and TRIESTE 1)

Houot, G. S. and Wilhm, P. H. 1955 2,000
Fathoms Down. E. P. Dutton & Co., New York
(FNRS-3)

Cousteau, J. Y. 1956 The Living Sea. Harper &
Row, New York (early history of SP-350)
Piccard, J. and Dietz, R. S. 1960 Seven Miles
Down. G. P. Putnam’s Sons, New York (TRI-
ESTE I and the events leading to its record
dive)

Shenton, E. H. 1968 Exploring the Ocean
Depths, W. W. Norton & Co., New York (Scien-
tific diving of SP-350)

Piccard, J. 1971 The Sun Beneath the Sea.
Charles Scribner’s Sons, New York (AU-
GUSTE PICCARD, BEN FRANKLIN, and the
Gulf Stream Drift Mission)

Link, M. C. 1973 Windows in the Sea. Smith-
sonian Institution Press (DEEP DIVER,
JOHNSON-SEA-LINK, and other undersea ac-
tivities of Mr. Edwin Link)

The Woods Hole Oceanographic Institution
beginning in 1960 issued yearly reports on the
design, construction, operations and modifica-
tions to ALVIN. The first 2 years deal with
ALUMINAUT, which at that time was a coop-
erative venture between the Navy and Rey-
nolds International, but from 1963 on through
1970 they deal only with ALVIN. These reports
are entitled Deep Submergence Research and
each covers a calendar year during the above
period. Unfortunately they are not widely dis-
seminated, but are available at WHOI and
may be found in university libraries where
oceanographic courses are offered. Careful
reading of these is literally a course in deep
submergence components and the painful
progress of making a manned submersible a
useful scientific tool. One of the main deficien-
cies with most reports describing modifica-
tions to submersibles is that the author tells
what has been changed but not why it was
changed or what was the problem. The WHOI
reports, on the other hand, provide all such
details, and they explain each change in de-
tail: Why each change was made, what the
component or system was lacking and how the
new approach is intended to improve the vehi-
cle, its support platform and its launch/re-
trieval system. They constitute, in substance,
a technological stroll through deep submer-

gence problems and developments of the six-
ties.

Another series of reports, also not readily
available, are the handbooks issued by the
U.S. Navy’s Deep Ocean Technology (DOT)
Program. Recognizing the severe problems in
various electrical and mechanical components
in manned deep submersibles, the Navy began
this program in the late sixties, and the re-
sults are profitable reading for both present
and future submersible operators and design-
ers. The various components investigated can
be seen in the list below. Each handbook
summarizes the problems with available com-
ponents, solutions to some problems and rec-
ommendations for surmounting others. The
reports are limited in distribution to those
who have a legitimate need for such data, and
requests should be addressed to:

Defense Documentation Center
Cameron Station
Alexandria, VA. 22314

As of 1974 the following handbooks have been
issued which pertain to manned submersibles.

Handbook of Electric Cable Technology for
Deep Ocean Applications. NSRDL (A), 6—54/
70, Nov. 1970. AD 877-774.

Rotary Shaft-Seal Selection Handbook for
Pressure Equalized, Deep Ocean Equipment.
NSRDC(A), 7-758, Oct. 1971. AD 889-330(L).
Handbook of Vehicle Electric Penetrators,
Connectors and Harnesses for Deep Ocean
Applications. NAVSEC, July 1971. AD 888
281.

Handbook of Fluids and Lubricants for
Deep Ocean Applications. NSRDC(A) MAT-
LAB 360, Rev. 1972. AD 893-990.

Handbook of Fluid Filled, Depth/Pressure
Compensating Systems for Deep Ocean Ap-
plications. NSRDV(A) 27-8, April 1972. AD
894-795.

Handbook of Electrical and Electronic Cir-
cuit-Interrupting and Protective Devices for
Deep Ocean Applications. NSRDC(A), 6-67,
Nov. 1971. AD 889-829.

Handbook of Underwater Imaging System
Design. NUC TP 303, July 1972. AD 904-
472(L).

Submersible Work and Instruments

Excluding the DOT handbooks, all of the
publications listed above contain accounts of

various work performed by the particular
submersibles. Additionally, the references in
Chapter 11 relate specific work accomplish-
ments by a variety of submersibles. Notewor-
thy, is reference (1) of Chapter 11, which
summarized all of the published scientific
accounts of submersible work through 1970.
A popularized version of submersibles and
their accomplishments is contained in:

Soule, G. 1968 Undersea Frontiers.

Rand McNally & Company, New York

The references in Chapter 11 also describe,
to varying degrees, the instruments used to
perform certain tasks. The best single refer-
ence for work tools is Winget’s report (ref. 6,
Chap. 11) which not only describes a wide
array of work tools, but also provides the
manufacturer’s name and address for each
component used in each device described.
This report can only be described as a gold-
mine for the builder or designer of submers-
ible work equipment.

Since the seventies most of the literature
describing submersible work is relatively
sparse. Perhaps because the work is no
longer mainly scientific and may be consid-
ered proprietary information by the user.
Virtually all recent accounts merely describe
the job as pipeline inspection, cable burial, or
the like, with details of the why, how and
performance of the vehicle and tools omitted.
Likewise, are accounts of submersible scien-
tific endeavors sparse regarding perfor-
mance of vehicles and instruments. Reports
of the National Oceanic and Atmospheric
Administration’s Manned Undersea Science
and Technology Program relate what work
was done, why and, when possible, its scien-
tific implications, but nothing regarding the
performance, problems or solutions is in-
cluded. Such omissions, though clearly a pre-
rogative of the user, are unfortunate, be-
cause identifying and making known the
problem areas of submersibles is the only
means of providing direction or goals to the
designer of future vehicles.

Soviet Bloc Submersibles

Conspicuous by its absence is any discus-
sion of Soviet Bloc submersible design. The
reason is quite simple: There is no easy way

to authenticate what information is availa-
ble. Mr. Lee Boylan of Informatics Inc.,
Rockville, Maryland summarized Soviet-bloc
submersible development in a 1969 mono-
graph for the Marine Technology Society
Journal (v. 3, n. 2) and updated this report in
1972 in the same Journal (v. 6, n. 5). Mr.
Boylan’s original work was based on 206
articles and reports from the Soviet Union
and elsewhere. It is most comprehensive, but
Boylan himself admits that his 45-year his-
tory does not comprise the entire Soviet Bloc
inventory. There are a few other articles
which serve to reinforce Boylan’s tabulation,
but the picture is still confusing.

From those details that are available,
Soviet submersible development and use
have been primarily aimed at fisheries inves-
tigations. In 1957 the Soviets converted a
fleet-type submarine into the fisheries re-
search vehicle SEVERYANKA. Seven re-
search cruises were conducted by this vehi-
cle during the next few years. Then it ap-
pears to have been decommissioned in the
early sixties.

At present, Russia, according to Boylan,
has or has had four submersibles which fol-
lowed SEVERYANKA; these are: The 6,562-ft
SEVER 2, the 810-ft GVIDON, the 984-ft
TINRO 1, and the DOREA for which no
operating depth is stated. International Hy-
drodynamics of Canada is constructing a
PISCES-class submersible (6,500-ft depth)
and the lock-out vehicle ARIES (1,200-ft
depth) for the Soviet Union for delivery
sometime in 1974.

Admittedly, this is making very short
shrift of Soviet Bloe undersea efforts. Al-
though they seem quite active in habitats
and swimmer delivery (wet) vehicles, there is
little information available on the actual
submersible field. A report by V. S. Yastre-
bov, Head of the Laboratory of Underwater
Research Technique, Academy of Sciences,
USSR, tends to confirm that there is really
very little to report in Soviet submersible
activities. Yastrebov’s report (presented at
the Brighton Oceanology International Con-
ference, 1972) compares the efficiency of di-
vers and underwater devices. He speaks of
an unmanned Soviet bottom crawler, CRAB,
and of manipulator experiments at the Acad-
emy of Sciences, but every example of sub-

10

mersible performance he cites is of a U.S.
vehicle. Furthermore, of 14 references in
Yastrebov’s report, 11 are from U.S. sources.
In another paper given at the Brighton Con-
ference, V. G. Azhazha of the Central Re-
search Institute of Fisheries Information
and Economics analyzed the efficiency of
submersibles in fishery investigations. Here
again, except for a brief mention of SEVER-
YANKA, all of the submersibles mentioned
are U.S., English or Canadian. One is left to
conclude, therefore, that Soviet-bloe at-sea
submersible experience is quite limited, of a
confidential nature, or both.

The ‘‘Manned”’ Aspect of
Submersibles

The most significant omission of submers-
ible components in the following chapters is
the human component. The Deep Submers-
ible Pilots Association and the Navy’s Sub-
marine Development Group One have de-
fined the minimal requirements for an opera-
tor or pilot. Chapter 12, herein, tabulates the
number and types of operating and support
personnel for selected vehicles. Unfortu-
nately, all of these fall quite short in actually
defining the nature and qualities of the peo-
ple who keep the system running efficiently
and safely. Indeed, if one were to list the
desirable attributes of a submersible crew-
man—and the crew includes support as well
as operating personnel—the final product
would seem unattainable.

First, for the most part submersibles work
far out at sea or in other isolated places
where public admiration is not the rule. Sec-
ondly, photographers, press agents and me-
dia representatives are generally unaware of
submersible activities until there is an emer-
gency, and these are quite rare. Thirdly,
working at sea is arduous, frustrating, con-
tinuous and, in the submersible business,
calls for the skills of a seaman, an engineer,
a diver and a master mariner. The point is
that the personnel must be highly-skilled,
dedicated individuals who are willing to
spend a good portion of their life on a pitch-
ing, rolling, benevolent prison. The pay is not
fantastic and residuals for television adver-
tisements are unknown. One hundred per-
cent successful missions are rare, and frus-
trating compromise is generally the rule.

So one might ask, where do you find such
people and what do you offer? Quite frankly
(and somewhat mysteriously), they find you
and surmounting the challenge seems to be
reward in itself. Commonality of back-
grounds, such as education, technical train-
ing and the like, is not readily apparent.
Most however, have spent a major portion of
their adult life working with the sea, either
in the Navy or with commercial enterprises.
Many, through various channels, simply
drift into the submersible area, others specif-
ically seek out the field. In either case, all
have a capacity for hard work and seem to
possess an unusually wide-ranging knowl-
edge of seamanship, diving, electronics and
other skills related to submersibles. Admit-
tedly it would be quite helpful to state the
desirable background characteristics to look
for in a submersible operator and the sup-
port crew, but, in the author’s experience, all
are quite individualistic and, like submers-
ibles themselves, defy categorization. Yet
each seems to have a particular skill that
contributes to a successful operation.

In this respect, an incident comes to mind
of a lost current meter array retrieved by
ALUMINAUT in 1967 off St. Croix, Virgin
Islands. ALUMINAUT, at that time, was the
ultimate in deep submergence technology, it
represented the best efforts of the best scien-
tific and engineering expertise industry and
academia could offer. In the course of re-

11

trieval it dived, made the necessary hookup
and performed perfectly. The final step, how-
ever, was to reel the retrieving line onto the
support ship. To complicate matters, when
the array line began appearing at the sur-
face it was a snarled and tangled mass of
nylon rope, wire and current meters. At this
point the knot-tying and load-handling tal-
ents of an ex-navy bosun, Mr. Doug Farrow,
were required for several hours to success-
fully bring the spaghetti-like mess aboard.

The “manned” component, therefore, re-
quires skills which range from those tracea-
ble to the Phoenicians to those developed in
the space age. Man’s ancestors, it is said, left
the ocean in primordial times; since recorded
history it is evident that he has tried, with
some success, to return. In earlier days it
was in wood and leather diving bells and
suits; now it is in steel and plastic shells.
Whatever the means, it has always been
man; never machines, against the sea. The
instruments, be they submersibles, subma-
rines, towed devices or whatever, are inani-
mate, inert and functionless without the in-
tervention of a human being. Regardless of
its duration, if the return to the sea is to be
successful, an arsenal of human talents must
be drawn from the pages of ancient and
recent history. The knot tier, the navigator,
the mariner, the engineer and the theoreti-
cal scientist all share equal responsibilities
and all can be found somewhere in the suc-
cessful submersible system.

i As i

: — -
*4 2

@U) ~@e

has) a
= @ 6®
| ed
|
- j
© 5

R..
mae 4

e
| - ‘
, ee “2 f
e 6 SFP Le es
6 ai -

eS « barat dys 81

DESIGN AND OPERATIONAL

CONSIDERATIONS

To accomplish its passenger-carrying and
work functions economically, a submersible
must be transportable, easily maintainable,
and amenable to launch/retrieval from a roll-
ing vessel. A review of the submersibles in
Chapter 4 reveals the varied approaches to
these requirements. No matter what the ap-
proach, there are laws of physics and human
biology which all successful vehicles must
obey. There are also logistical and operational
considerations which, because of their impor-
tance, are an integral part of the submersible
diving system; these are its support platform,
and its launch/retrieval apparatus.

Five categories have been defined and in-
clude the design and operational factors with

13

which the successful submersible operator
must contend; these categories are:

Environmental Constraints

Vehicle Performance

Human Considerations

Emergency Procedures

Support Requirements
The factors within these categories are drawn
from the history of submersible operations
and deal with the submersible system instead
of the submersible as an independent opera-
tor. Inclusion of support requirements may
seem outside the scope of submersible diving
principles; but submersibles are not military
submarines, and none routinely operates in
the open sea without surface support and, in
the final analysis, shore support.

ENVIRONMENTAL
CONSTRAINTS

Pressure

A fundamental consideration in the design
of any vehicle transporting man or equipment
underwater is pressure. Pressure may be re-
sisted, as it is by the submersible’s pressure
hull, or it may be compensated, as is the case
with many battery packs, propulsion motors,
etc. Once the submersible’s operating depth
has been established, the pressure at that
depth will determine the dimensional and
compositional characteristics of the vehicle
and its components.

Pressure in the ocean is a function of depth,
and for routine oceanographic calculations the
33-foot depth is equal to about 1 atmosphere
(14.7 psi). To moderate depths, say to several
thousand feet, seawater may be considered
incompressible and the following expression is
used:

Di pa wh

where p is pressure in pounds per square inch
(psi), p, is atmospheric pressure (psi), w is a
1.0-ft head of standard salt water equal to a
pressure of 0.4447 psi and h is depth in feet;
then

p = 14.7 + 0.444h psi

At greater depths, the compressibility of
water must be considered and, to obtain a
more accurate value, the density of seawater
may be taken as varying linearly from 64 pef
at the surface to 66.6 pef at 30,000 feet
(Fig. 2.1). Neglecting atmospheric pressure,
the pressure at depth h then is approximately

2
p= 0.444h + 0.3(2 7) psi (ref. 1)

Hence, at 6,000 feet, the pressure on the
surface of a body is 2,674.8 psi acting normal
to every exposed surface.

Seawater Conductivity

Various devices in submersibles, e.g., mo-
tors, batteries, pumps, are immersed in a pro-
tective liquid which serves as an ambient
pressure compensator and an insulator
against loss of power to seawater. The intrin-
sic dielectric conductivity of seawater is ap-
proximately 4 mhos/m (milliohms/meter) or 4,-
000 times greater than that of fresh water;

14

and, it increases with temperature, salinity,
frequency of the propagating wave and pres-
sure (1). A common cause of failure in electri-
cal systems is contamination of the compen-
sating/insulating fluid by seawater, where as
little as 0.1 percent contamination reduces the
resistivity of some fluids below recommended
limits (8). Various forms of corrosion (pit, crev-
ice, stress, layer, etc.) attack metals in seawa-
ter. Protective coatings and/or sacrificial
anodes should be considered in the initial de-
sign stage.

Temperature

The temperature of seawater (Fig. 2.1) has,
among others, two important effects on sub-
mersible diving: 1) The occupants must deal
with extremes of temperature caused mainly
by loss or gain of heat through the pressure
hull; and 2) the pressure hull material must be
capable of retaining its desirable characteris-
tics (crack arrest) under cold temperatures
encountered above and below the surface.

Light

Sunlight has been observed to penetrate the
ocean to depths as great as 2,300 feet (4), but
usable sunlight for detailed external viewing
generally terminates at 1,000 feet even under
the very best of conditions. Consequently, the
submersible user must rely on artificial light
sources for external illumination. Because of
the lateral and vertical variability of hght
transmission properties and the frequent
blinding effects of backscatter throughout the
oceans, lighting for each diving mission is
approached on a case-by-case basis.

WEIGHT DENSITY, LB/FT* SALINITY, PARTS PER THOUSAND TEMPERATURE, °F

64 65 66 3334858687 30. 40 +50 60 70 80
= = Surface :

, 7 souTe

7,000

6,000
SSE

2,000

DEPTH, FATHOMS
12,000
E

DEPTH, FEET

18,000

ee ee
3,000

xe

4,000
24,000

—
0
30,000

o 10 20
TEMPERATURE, °C

Fig. 2.1 Seawater density, salinity, and temperature as function of ocean depth.
[From Ref. (2)]

Currents

Currents in the ocean and contiguous
waters range in horizontal speeds from less
than 0.05 knot (Pacific deep water) to 15.5
knots (Skjerstadt Fjord, Norway), and they
fluctuate rapidly both spatially and tempo-
rally (5). Where currents are strong, the sub-
mersible must be able to maintain control and
headway to conduct its task and maneuver
safely.

Density

Since seawater density varies not only with
depth (Fig. 2.1), but with temperature and
salinity as well, vehicle buoyancy calculations
must be based on the specific diving location.
In some instances, underwater discharge of
fresh or brackish water near the bottom has
caused significant loss of positive buoyancy on
a submersible working close to the bottom (6).

Acoustics

Light and radio waves attenuate rapidly in
the ocean. Depending on the frequency of the
signal and oceanographic conditions, sound
waves may travel for thousands of miles.
Sound, therefore, is used for communications
between ship and submersible, for tracking of
the submersible from the surface and for a
variety of data collection instruments. The
velocity of sound in seawater varies from
about 4,775 to 5,150 feet/second and increases
with increasing temperature, salinity and
pressure (5). If sound is traveling vertically
downward, the effect of refraction (bending) is
relatively slight; as the beam direction ap-
proaches the horizontal, refraction may be-
come quite great. The usual situation (Fig. 2.2)
is for sound speed to decrease initially with
depth as the temperature decreases; hence,
the upper part of the sound beam travels
faster than the lower part and a shadow zone,
into which the sound beam does not pene-
trate, is left near the surface. Such refraction
may occur at any depth in the ocean; its
effects can control the ranges from which a
submersible can be tracked from its surface
support and still maintain voice contact.

Sea State

The operational limits of submersibles’
launch/retrieval devices are determined by
wave height (the vertical distance from wave
trough to crest) and period (the time interval

15

between successive crests passing a station-
ary point); the condition is generally termed
Sea State, and its boundaries are presented in
Table 2.1. Sea state, as defined in the accom-
panying table, is misleading as a measure of
the ability of a launch/retrieval apparatus, for
it does not take into account wave period. For
example, launch/retrieval may be ruled out in
low sea states if the period is on the order of 8
to 10 seconds; but, if the period is doubled or
greater, the frequency of the wave crest’s
passage is less and time may be sufficient to
complete the hook-up of lift lines between
successive crests. One must be aware that the
sea surface is rarely calm and is in a constant
state of change. If a submersible system is to

SPEED OF SOUND,
FT/SEC

4900 4950 5000

4000

DEPTH, FEET

6000

; a
10,000

Fig. 2.2 Typical variation of speed of sound with depth in the ocean.

be economically practicable, the ability to de-
ploy and recover the vehicle safely under av-
erage weather conditions is Just as important
as pressure hull integrity.

Bottom Conditions

The ocean floor ranges in composition from
soft, fine muds to hard rock cliffs; a submers-
ible can be expected to operate within these
ranges. During operations requiring a vehicle
to transit near the bottom, search missions for
example, the pilot generally prefers to “fly”
just off the bottom, a few pounds negatively
buoyant. This procedure makes vertical con-
trol of the submersible much easier. Over a
rough, hard bottom, rugged skegs or other
devices (wheels, skids) are used to protect the
pressure hull and other components. On a soft
bottom the submersible may accumulate sedi-
ment, the weight of which can become great
enough to restrain the vehicle from surfacing.
ALUMINAUT, for example, accumulated ap-
proximately 4,000 pounds of sediment in this
manner during an operation off the coast of
Spain.

VEHICLE PERFORMANCE
REQUIREMENTS

No one submersible is designed to perform
all the underwater tasks that may arise, but
there is a commonality of vehicle performance
requirements which may be found by analyz-
ing past dives; these requirements are listed
below.

Viewing

Some means for external viewing is re-
quired. Viewports (windows) provide the easi-
est and most reliable solution, but their loca-
tion and quantity are arbitrary and fre-
quently dictated by other characteristics of
the hull configuration. Acrylic plastic pressure
hulls are available which can provide pano-
ramic viewing. Television cameras are an ad-
junct to direct viewing and, with low light
level amplification, may provide greater range
and resolution. Optical viewing systems, e.g.,
periscope-type, have also been employed.

Buoyancy
Archimedes’ principle defines the magni-

16

tude of upward buoyant force: any object
immersed in a fluid is buoyed up by a force
equal to the weight of the fluid displaced.
Three states of submersible buoyancy are de-
sired: Positive, negative and neutral. Displace-
ment volume (D) determines the buoyant
force, and buoyancy is expressed by the ratio
W/D, i.e., weight of vehicle (W) to weight of
displaced water. Buoyancy regulation under
different vehicle load and water density condi-
tions requires variable ballast systems which
may include one or more of the following:
Water ballast tanks, steel shot, gasoline filled
tanks, or interconnected hard and soft con-
tainers.

Trim

To correct unequal weight distribution
along the longitudinal axis which might cause
the vehicle to have an up or down angle from
the horizontal, or to intentionally obtain such
an up or down angle for the dive mission, a
trim system is required. This system, through
a variety of methods, acts to transfer weight
or ballast forward or aft.

Stability

Stability is that property of a body that
causes it, when disturbed from a condition of
equilibrium, to develop forces that tend to
restore it to its original condition. Equilib-
rium is a state of balance between opposing
forces which may exist in three states: Sta-
ble, neutral, and unstable. For example, if
when an angle is put on a ship forces are set
up which act to reduce the angle, the ship is
stable. Neutral equilibrium exists when a
body remains in its displaced position after a
force that displaced it is removed; unstable
equilibrium exists when a body continues
movement after a slight displacement. Sta-
bility in a submersible is intimately related
to center of buoyancy and center of gravity.
The center of buoyancy is the geometric cen-
ter of volume of the displaced water. The
center of gravity is the effective center of
mass. These two centers are indicated as B
and G, respectively, in Figure 2.3a. When a
floating body is in stable equilibrium, its cen-
ter of buoyancy and center of gravity are in
the same vertical line. Another term which
must be introduced to understand stability
is metacenter, which is the point of intersec-

|
|
|

iT

|
|

Fig. 2.3 Change of center of buoyancy metacenter during submergence.

tion of a vertical line through the center of
buoyancy of a body floating upright and a
vertical line through the new center of buoy-
ancy when it is inclined a small amount as
indicated by the letter M in Figure 2.3b.

When a surfaced submersible is tipped as
shown in Figure 2.3b, the center of buoyancy
moves from B to B1 because the volume of
displaced water at the left of G has been
decreased while the volume of displaced
water to the right is increased. The center of
buoyancy, being at the center of gravity of
the displaced water, moves to point B1 and a
vertical line through this point passes G and
intersects the original vertical at M. The
distance GM is known as the metacentric
height. This illustrates a fundamental law of
stability. When M is above G, the metacen-
tric height is positive and the vessel is stable
because a moment arm, GZ, has been set up
which tends to return the vessel to its origi-
nal position. It is obvious that if M is located
below G, the moment arm would tend to
increase the inclination. In this case, the
metacentric height is negative and the ves-
sel is unstable.

When on the surface, a submarine presents
much the same problem in stability as a
surface ship. However, differences are appar-
ent as may be seen in the diagrams in Figure
2.3c, where the three points B, G, and M,
though in the same relative positions, are
much closer together than is the case with
surface ships.

17

As noted above, when a ship on the surface
heels over, there is a shift in the position of
the buoyancy center because of the volume
shape change below the waterline. In the
case of a submerged submarine, no such
change takes place because all the volume of
the submarine is below the surface of the
water. Thus, for submerged stability, the
center of gravity must be below the center of
buoyancy.

During the process of going from the sur-
faced condition to the submerged condition,
the center of gravity of the submarine, G,
remains fixed slightly below the centerline of
the boat while B and M approach each other.
At complete submergence, G is below B, and
M and B are at a common point. These
changes are shown diagrammatically in Fig-
ure 2.8¢.

As the ballast tanks fill, the displacement
becomes less with the consequent rising of B
and lowering of M. There is a point during
submergence when B coincides with G. Due
to the configuration of the upper part of the
hull, B would only move a short distance
from G if a list were taken at this point. In
this condition, the stability is least; and the
time spent at this low-righting stage must be
minimal. When the ballast tanks are fully
flooded, B rises to the normal center of buoy-
ancy of the pressure hull, and stability is
attained with G below B.

To keep the center of gravity low, batteries
and other heavy items are carried as low as
possible where they have the greatest effects
on stability. Submersible transverse meta-
centric heights (submerged) are quite small
and range from 3 to 12 inches.

Power

Electric power is compatible with all pro-
pulsion, lighting, hotel, and virtually all in-
strument requirements and is the exclusive
ultimate power source in all deep submers-
ibles. Long duration power can be supplied
from the surface through a cable, but at the
expense of maneuverability; conversely, ma-
neuverability is retained using self-con-
tained batteries, with a corresponding limi-
tation in operating time. Two power options
predominate in shallow (less than 1,000-ft)
submersibles: Manual and electric. Transfer
of manual power through the pressure hull

can be by direct mechanical linkage (limited
to shallow depths owing to compression on
the hull with consequent size reduction of
thru-hull penetrations) or by hydraulics.

Maneuverability

The requirements for maneuverability
vary considerably in speed and degree, but
generally the vehicle is expected to be capa-
ble of controlled movement in the vertical
and horizontal. For many if not all missions,
the vehicle must be able to “hover” (dynami-
cally or statically) at a given depth or dis-
tance above the bottom.

External Attachments

For maximum mission adaptability, the ve-
hicle should have external attachment
points for installation of various instruments
or devices to conduct undersea tasks. Since
few, if any, of these instruments are stand-
ard in weight, size, shape, or mode of opera-
tion, a degree of flexibility in such attach-
ment points is desirable. In the probable
event that such devices will require electri-
cal power and/or control, provisions must be
made to furnish spare electrical connectors
and thru-hull penetrators.

Lock-out/Lock-in

If the submersible is designed for trans-
porting and supporting divers, provisions
must be made for ballasting the vehicle
when they leave (to restrain it from ascend-
ing) and deballasting when they return.
Hatches and viewports in the diver’s com-
partment must be double-acting to resist not
only external pressures, but internal pres-
sures as well. Communications must be ar-
ranged between the diving compartment and
the unpressurized part of the pressure hull;
and, when surfaced, a means of providing
food or medical aid must be incorporated in
the design if decompression is required.
Whereas the egress/ingress hatch will be on
the keel of the submersible, and the vehicle
might be bottomed during diver operations,
space between the hatch and bottom must be
sufficient to allow easy access to the hatch.
Consideration must likewise be given to per-
sonnel transfer to a decompression chamber.

Weight and Size

The submersible’s dry-weight (in air) and

18

physical dimensions will govern the methods
of launch and retrieval as well as the size of
its support ship and the methods available to
it for land and air transport.

Payload

There are no minimum or maximum pay-
load standards, and they range from less
than 100 pounds to several tons. The larger
the payload requirements, the larger the ve-
hicle size and, correspondingly, the greater
the necessary support efforts become, with
resultant lowered mobility. Trade-offs are
possible whereby a non-essential manipula-
tor, for example, might be replaced with an-
other instrument or a lock-out chamber re-
placed with a different module for a particu-
lar dive. Distribution of payload weight and
balance must be considered to assure that
vehicle trim and control are not jeopardized.

HUMAN CONSIDERATIONS

Respiration

Oxygen must be supplied, and carbon diox-
ide must be removed for the duration (6-12
hr) of a normal dive and for an extended
period in the event of an emergency. Moni-
toring devices must be included to maintain
proper levels and to check for the presence of
contaminants. In the event of diver support,
storage and supply of air or mixed gas (e.g.,
helium/oxygen) must be accommodated.

Temperature/Humidity

In shallow tropical dives, temperatures
(°F) and relative humidity (%) reach into the
90’s; with depth, or in the high latitudes, the
temperature can fall into the 40’s with a
corresponding humidity decrease. Both these
extremes bear heavily on human perfor-
mance and must be dealt with successfully.
Deep diving in the tropics can combine both
extremes and includes condensation on the
interior walls of the hull with consequent
drippage; this can be detrimental to equip-
ment as well as to human occupants.

Food/Water

Normal and emergency food and water ra-
tions must be carried; limited power or the
possibility of its entire loss restricts the type
of food and preparation possible.

Waste Management

Means must be provided to accommodate
metabolic wastes and to treat and store such
wastes for the duration of the dive.

Fatigue

The internal arrangements for pilot and
passenger(s) must be such that the efficiency
of both is not decreased by uncomfortable or
awkward layout of instruments and controls.
Similarly, long periods at the viewports can
be extremely taxing and detrimental to the
mission if pilot or observer is forced into
awkward positions to view or work.

EMERGENCY PROCEDURES

Entanglement

To minimize the fouling potential with for-
eign objects such as wreckage, cables, or
ropes, submersibles should have smooth,
streamlined exterior surfaces and objects ex-
tending beyond the fairing should be kept to
a minimum. When possible, objects that offer
a potential for fouling should be jettisonable.

Power Loss

In the event of a complete electrical power
loss, the vehicle should have mechanical
means of surfacing either by jettisoning com-
ponents, dropping extra ballast or blowing
water ballast. An emergency power supply to
operate critical emergency components
should be considered.

Fire and Noxious Gasses

Emergency breathing apparatus and fire
extinguishers within the pressure hull are
required in the event of fire and release of
noxious or toxic gasses. Nonflammable wir-
ing insulation should be used for all power
cables and control wiring. Only insulation,
paint, plastics, and other materials free of
detrimental outgassing should be used inside
manned spaces.

Deballasting Loss

A number of vehicles contain backup de-
ballasting procedures in the event that the
normal deballasting does not function or is
insufficient. These include jettisoning of bat-
teries, instruments, manipulators, or trim
liquids (mercury). Where depth allows, many

19

vehicles may be flooded by ambient sea-
water or pressurized by compressed air to
open the hatch for emergency exit. In a few
cases, the entire positively buoyant pressure
hull can be manually released from the re-
mainder of the vehicle, whence it will free-
float to the surface.

Tracking Loss

Owing to inaccuracies in tracking proce-
dures or accidental loss of acoustic contact, a
submersible may surface out of contact with
its support ship and be completely on its
own. Emergency signaling devices and ra-
dios are required. Some vehicles have such
low freeboard that to open the hatch in any-
thing higher than sea state 1 could swamp
the pressure hull. In this case, emergency
flares might be impossible to employ, and if a
long period of time must be spent with the
hatch closed awaiting outside assistance, the
endurance of the emergency life support sys-
tem to sustain the passengers could be ex-
ceeded. The color of the submersible might
also be critical to visual sighting. A white
submersible, with only 1 or 2 feet of its
conning tower or sail protruding above the
surface and posed against a background of
whitecaps, is extremely difficult to see. Fur-
thermore, radar may be ineffective owing to
the sail being masked by sea return.

SUPPORT REQUIREMENTS

Transportation

Weight and size are the factors controlling
a submersible’s transport and, hence, mobil-
ity. Land, sea and air transportation are
possible; but, for some vehicles, this means
dismantling major components. Deployment
at the site of embarkation requires lift and
possible rail facilities not available at many
ports.

Support Platform

There are few, if any, occasions when a
submersible will not require a support plat-
form. At the very least, this platform will be
required to tow the vehicle to the dive site
and track it while submerged. In open-sea
operations, the platform will act to maintain
the vehicle, house its support and scientific
crew, and perform work tasks in conjunction

with the submersible. Proper selection of
such a platform is critical to the effective-
ness of the submersible system.

Launch/Retrieval Apparatus

Unless the submersible is too large for
launch/retrieval at sea, an apparatus is re-
quired to deploy and retrieve it after each
dive. Four basic methods may be utilized.
One is a device to attach to and lift the
vehicle out of the water, such as a crane. The
second involves deballasting a submersible
platform onto which the submersible is ma-
neuvered. Third is the mechanical hoisting of
an elevator platform attached to a surface
vessel. A fourth approach involves the
mother submarine concept in which the sub-
mersible is launched or retrieved and trans-
ported by a completely submerged platform.
In the event of external repairs or mainte-
nance to the submersible, the mother subma-
rine may be required to surface.

Tracking and Navigation

While the submersible is submerged, a
method of tracking from the support plat-
form is required to locate it, to clear the area
for surfacing, and to join with the vehicle
after the dive. If the mission requires know-
ing precisely where the submersible was,
such as surveying, a method of geodetic posi-
tioning is necessary. This might be served
through the tracking system if the support
platform maintains a running log of its own
and the submersible’s relative position, or it
may be an in situ navigation network by
which the vehicle itself maintains a real-time
display and record of its underwater posi-
tion.

THE DEEP QUEST
SUBMERSIBLE SYSTEM

To demonstrate one manufacturer’s ap-
proach to meeting the constraints and re-

Fig. 2.4a) The submersible system DEEP QUEST (LMSC); b) Schematic of DEEP QUEST as designed with potential diver lockout compartment and transfer bell. (LMSC)

quirements of submersible diving, Lockheed
Missiles and Space Corporation’s DEEP
QUEST system will be examined (Fig. 2.4a).
DEEP QUEST is not necessarily the most
successful approach, but its 8,000-ft opera-
tional depth capability and support systems
confront and offer solutions to the majority
of problems encountered. (The following data
was attained from refs. 7 through 11.)

ENVIRONMENTAL
CONSTRAINTS

Pressure

The manned compartment (pressure hull
of DEEP QUEST) consists of two intersect-
ing spheres welded together with a 20-inch-
diameter opening between the two and a 20-
inch-diameter opening (hatch) atop the aft
sphere. The spheres are 7 feet in outside
diameter (OD), 0.895 inch thick, and are com-
posed of 18 percent nickel, 200-KSI-grade

maraging steel. A weldment of four hemi-
heads and interconnecting “Y” rings form
the basic structure. A collapse depth of 13,-
000 feet (5,772 psi) provides a safety factor of
1.6 at its operating depth of 8,000 feet (3,554
psi). DEEP QUEST has been designed to
incorporate a diver lock-out compartment
and a transfer bell as shown in Figure 2.4b,
but these are not affixed to the submersible
at present.

Seawater (Corrosion Protection)

To protect the fairings and foundations,
piping, variable ballast tanks, high pressure
air tanks, and electrical inverter/controllers,
a multi-coat polyurethane Laminar X-500
finish has been applied. The pressure hull is
isolated from contact with the aluminum
outer hull by mounting it on rubber pads and
clamping it down with a phenolic collar. It is
further protected by a mild steel anode sys-
tem. Whenever possible, dissimilar metals
are electrically isolated by non-conductive

VIEW DOME (RECESSED)

DIVER LOCK-OUT

ACCESS TRUNK

INSTRUMENTATION SPHERE
PILOT'S SPHERE

VERTICAL THRUSTER

MANIPULATOR

CHAMBER (CON-

CEPTUAL) en

VIEWPORT

TRANSFER BELL
(NOT STANDARD) b

Fig. 2.4 b) Schematic of DEEP QUEST as designed with potential diver lock-out compartment and transfer bell. (LMSC)

21

mountings. Small zone anodes are utilized
freely to protect against electrolysis.

Temperature

To control the pressure hull’s internal tem-
perature there are two temperature sensors
_in each of the two spheres which activate an
electrical damping system to apportion air
through three heat exchangers. Excess heat
(from personnel and operation of electrical
equipment) is conducted through the hull
wall. Electrically powered heater strips sup-
ply additional heat if that produced by equip-
ment operation is insufficient. Toughness
(crack arrest) of the pressure hull’s marag-
ing steel was improved by careful modifica-
tion of the chemical composition of the steel.

Light

To provide external lighting at depth,
DEEP QUEST has nine fixed lights ranging
in power from 500 to 2,500 watts; these may
be individually controlled. On each of the two
television pan and tilt mechanisms is a 500-
watt flood light for trainable illumination.
Currents

To counter adverse currents, in addition to
maneuvering, DEEP QUEST may employ
two 7.5-hp, stern-mounted axial thrusters
and one 7.5-hp lateral water-jet bow thrus-
ter.

Density

A steel shot (1,900 lb dry weight) releasable
ballast system is used to adjust for minor
seawater density changes. DEEP QUEST
normally operates submerged in a slightly
heavy (negative buoyancy) condition, taking
advantage of her lifting body outer hull con-
figuration and vertical thrusters.

Acoustics

To minimize the effects of sound refrac-
tion, the submersible’s support ship TRANS-
QUEST attempts to maintain a position
nearly above DEEP QUEST during the dive.
Two 27-kHz acoustic pingers are affixed to
the submersible; one is omnidirectional and
one is vertically oriented by a parabolic re-
flector. A directional hydrophone antenna on
TRANSQUEST provides the relative bearing
to DEEP QUEST and a modification to the
submersible’s underwater telephone (UQC)

22

provides range information on a digital read-
out.

Sea State

TRANSQUEST?’s \aunch/retrieval system
(see Chap. 12), a hydraulically-powered ele-
vator platform mounted in the open-stern-
well, is marginally effective at sea state 4 in
short period waves, optimizing at longer pe-
riod swells.

Bottom Conditions

DEEP QUEST’s outer hull is streamlined
and rugged. Two skids on the bottom of the
vehicle protect it against damage and hold it
high enough off the bottom to inhibit the
possibility of accidentally taking aboard sedi-
ment. Object avoidance/search sonar pro-
vides for full-scale range indications from 15
to 1,500 yards.

VEHICLE PERFORMANCE

Viewing

For direct viewing, DEEP QUEST incorpo-
rates two viewports: one in the forward hull
looks down and forward; one in the aft hull
looks directly down through a hatch located
on the bottom of the aft hull. The aft view-
port is equipped with an optical remote view-
ing system incorporating an external “fish-
eye” lens. Augmenting the viewports are two
(port/starboard) pan- and tilt-mounted TV
cameras; one bow-mounted TV camera, and
one sail-mounted, 360-degree-vision, peri-
scope-scanning, TV camera, and a fifth cam-
era mounted as desired to observe a particu-
lar area or equipment for the specific dive.

Buoyancy

Four ballasting/buoyancy components are
incorporated in DEEP QUEST (Fig. 2.5): 1) A
Main Ballast System, consisting of two for-

‘ ward and two after tanks (port/starboard),

provides 12 percent reserve buoyancy on the
surface and is blown free of water by com-
pressed air; 2) a Shot Ballast System, con-
sisting of 1,900 pounds (wet) of steel shot in
two cylindrical hoppers mounted outboard in
the longitudinal C.G. plane provides ‘‘fail
safe” ballast which is electromagnetically
held and dropped in the event of a total
power loss or metered out as desired; 3)

34,000 pounds of syntactic foam (36-pef ave.
density) neutralizes negative buoyancy of
fixed structure and equipment; and 4) mova-
ble lead ballast (26-lb bricks), up to 3,000
pounds, provides the means of adjusting trim
and weight as calculated pror to each dive.

Trim

The longitudinal moment (trim) of DEEP
QUEST can be changed 30 degrees up or
down during the dive by pumping oil from
one to another of two, 18-inch-diameter, pres-
sure-compensated, spherical tanks located
fore and aft; each tank is initially half filled
with 720 pounds of mercury which are sepa-
rated from the oil by a rubber diaphragm
and forced forward or aft by the pumped oil.
A further refinement on DEEP QUEST is a
port/starboard list tank system which

RUDDER
(YAW)

HORIZONTAL
THRUSTERS (1)

BATTERIES

MOVE
RIGHT

BATTERIES

= LATERAL
REV-FWD THRUSTERS (2)

MOVE
EERT

DIVE
PLANE
(PITCH)

'

VERTICAL THRUSTER CONTROL
(UP/DOWN)

DYNAMIC CONTROL

VERTICAL
THRUSTERS (3)

changes the roll or transverse moment (+10
degrees) of the vehicle in a fashion similar to
the trim system.

Stability

The surfaced metacentric height (GM) of
DEEP QUEST is 12 inches; the submerged
metacentric height (BG) is 3 inches. The short
BG requires that careful consideration
be given to attachment location and weight
of additional equipment.

Power

Main power is supplied by two, 120-VDC,
pressure-compensated, lead-acid batteries
supplying a total of 230 kWh which enable
the vehicle to cruise at a speed of 2 knots for
18 hours. For scientific or other work instru-
ments the following is available:

PAYLOAD AREA
MAN-IN-SEA MODULE
VARIABLE BALLAST TANKS (2)
PRESSURE SPHERES

BOW VIEW

STATIC CONTROL

Fig. 2.5 DEEP QUEST's dynamic and static maneuvering ability.

23

120 VDC (nominal)
29 VDC + 2%
115 VAC rms + 2.5 V, 60 Hz, single phase
115 VAC rms + 2%, 400 Hz, single phase
Two independent 28-VDC, silver-zine batter-
ies within the pressure hull provide 3.6 kWh
of emergency power.

Maneuverability

The axial, vertical, and lateral propulsive
units, as described in Figure 2.5, in conjunc-
tion with stern planes and a rudder, provide
five degrees of freedom (pitch, roll, heave,
yaw, surge) and a dynamic maneuvering ca-
pability through the speed range of 0 to 3.5
knots. Static roll and pitch rotational mo-
ments are applied by weight transfer in the
trim and list systems. An automatic pilot
(course, speed and pitch angle) and an auto-

Fig. 2.6

24

matic depth control are additional control
adjuncts.

External Attachments

DEEP QUEST offers several areas for at-
tachment of instruments, and a jettisonable,
steel framework or “brow” may be attached
on the bow to carry a variety of instruments
including a 700-pound coring device or a 1,-
500-pound reel of line. Abaft the pressure
hull is an enclosed area within the fairing of
approximately 385 cubic feet; this area may
be used to accommodate instruments or tools
of widely varying dimensions and weights. In
the event that these areas are not desirable
or usable, it is possible to attach instruments
to the top of the vehicle by bolting down
“Unistrut” configurations as desired (Fig.
2.6). Within the after pressure sphere two 19-

“Unistrut’’ instrument attachment to DEEP QUEST's fairing. (NAVOCEANO)

inch-wide, 59-inch-high, standard electronics
racks are available for installation of equip-
ment; within the entire pressure hull ap-
proximately 20 cubic feet of space are availa-
ble for additional equipment. Electrical pene-
trations through the pressure hull are pro-
vided for additional equipment; these consist
of twenty-six, 2-wire (No. 18) AWG circuits
and four, 2-wire (No. 16) AWG circuits. Extra
leads can be made available by alternate
substitution means.

Lock-out/Lock-in

A 25-inch-diameter door on the after pres-
sure sphere is configured to join with a ““man-
in-sea”’ module to provide diver lock-out/lock-
in facilities for at least two divers. The mod-
ule, when installed, will occupy the enclosed
area now available for additional instrumen-
tation. A transfer bell may be attached to the
bottom hatch of the after pressure sphere for
transferring personnel to or from manned un-
dersea stations at atmospheric pressure or to
rescue personnel from disabled submarines
configured to accommodate the transfer bell.

Payload

In excess of 2,000 pounds (wet weight) may
be carried within the diver module area. A
total of 7,000 pounds may be accommodated by
relocation of buoyancy (syntactic foam) mate-
rial.

HUMAN CONSIDERATIONS

Respiration

Oxygen is carried within the pressure hull
in four bottles (0.37 ft? each at 2,250 psi), two
of which are spares. Oxygen is automatically
bled into the cabin by a solenoid-actuated
differential pressure control switch maintain-
ing cabin pressure at 2 inches of water above
a l-atmosphere reference chamber. Carbon
dioxide and other contaminants are removed
by blowing a portion of the circulated air
through lithium hydroxide/activated charcoal
cannisters. An emergency blower is available
for backup contaminant removal. Cabin pres-
sure is monitored and displayed on a gage in
the forward sphere. Oxygen and carbon diox-
ide partial pressures are detected by sensors
and displayed; a red light alarm is activated
when these pressures are beyond allowable

25

limits (O,: 140 to 180 mm Hg; CO,: 8 mm Hg
max.). A Mine Safety Appliance universal kit
is carried to identify trace contaminants.

Temperature/Humidity

With seawater temperature between 28°
and 55°F, cabin temperature is controlled, as
explained previously, at 70°F + 10°F. Relative
humidity is maintained at 60% + 20% by
condensation of moisture in the heat exchan-
gers. All parts of the pressure hull’s interior,
with exceptions of the heat exchange portion
and hatches, are covered with 5/8-inch-thick
polyvinyl! chloride (Ensolite) insulation.

Food/Water

Normal diving food rations consist of sand-
wiches and other foods prepared daily prior to
each dive. Emergency dehydrated food is car-
ried to sustain four people for 48 hours. Water
is carried in plastic containers.

Waste-Management

Wide-mouth plastic jars enclosing vinyl bags
are carried for collection and storage of liquid
and solid wastes. Wescodyne germicide is used
as a stabilizing agent and activated charcoal
for odor control. A folding camp-type toilet
seat with plastic waste bag is carried.

Fatigue

Pilot and co-pilot are provided with cush-
ioned seats in the forward sphere. No perma-
nent facilities are provided for the two observ-
ers other than a foam-rubber cushion located
on the deck between the pilot and co-pilot
upon which the observer may lie to use the
forward-looking viewport. The dimensions of
the pressure hull are sufficient to provide
headroom for standing and stretching.

EMERGENCY PROCEDURES

Entanglement

DEEP QUEST’s streamlined fairings pre-
sent minimal entanglement potential. Its ma-
nipulators, pan and tilt mechanisms and for-
ward instrument brow are jettisonable. All
propellers are shrouded and screened to pre-
vent entanglement with rope or wire.

Power Loss
An emergency power source is carried in-
side the pressure hull on each dive. In the

event of a total power (normal and emer-
gency) loss the steel shot is automatically
dumped. Emergency power can be used to
operate jettisoning circuits, underwater tele-
phone, radio, and life support equipment.

Fire and Noxious Gasses

An emergency breathing system for four
people is carried which consists of four full-
face masks coupled to a common rechargeable
LiOH/chareoal cannister and oxygen supply
with a breathing bag which acts as an accu-
mulator. A pressure of 1.5 inches of water
above cabin ambient pressure is maintained
in the emergency system to prevent contami-
nated air from entering. The system provides
a total of 3 hours for each person. Two 2.5-
pound CO, fire extinguishers are carried at all
times. When a fifth person is carried, an OBA
(Oxygen Breathing Apparatus) is added.

Deballasting Loss

In the event that normal ballasting meth-
ods and power are lost, the following may be
dropped to gain positive buoyancy as “indi-
cated:

TRIM HG

1,250-LB STEEL
SHOT
1,700-LB

Not included above are the jettisonable me-
chanical arms and brow and breakaway pan
and tilt mechanisms (Fig. 2.7).

Tracking Loss

If DEEP QUEST becomes separated from
TRANSQUEST, it has several options while on
the surface for communication and location. A
radio direction finder on the support ship may
home in on a 2182-kHz voice transmitter, or a
Coast Guard aircraft may home on a 121.5-
MHz signal transmitted from a self-powered,
omnidirectional emergency beacon aboard the
submersible. A transducer affixed to the bot-
tom of the submersible allows for UQC com-
munication when surfaced. A floodable sail
over DEEP QUEST’s top hatch allows for
opening of the hatch in inclement weather to
flush out cabin air if required. Surface view-
ing capability without opening the hatch is
attained through use of the sail-mounted tele-
vision periscope. DEEP QUEST’s interna-
tional orange sail and rudder provide excel-
lent contrast against all spectrums of water
color. A pressure-switch actuated, sail-
mounted, flashing xenon light is provided for
nighttime visual location.

BOW RACK

MANIPULATORS
PAN &
TILT

LISTHG FWD BATTERY
00-LB CELLS
3,500-LB

Fig. 2.7 DEEP QUEST 's jettisonable components.

26

SUPPORT REQUIREMENTS

Transportation

As it is one of the larger deep submersibles,
DEEP QUEST is normally considered only sea
transportable. However, with the sail and
stern planes removed, DEEP QUEST could be
air (C-141) and land (tractor, trailer, rail)
transportable. At its home port, San Diego, a
marine railway is available to transport it in
and out of its shop.

Support Platform

The Motor Vessel TRANSQUEST (see Table
12.2 for specifications) was specifically de-
signed to support DEEP QUEST in extended
open-sea operations, but it is somewhat lim-
ited by its size (108 ft) and speed (6.2 knots
max.).

UNDERSIDE
VIEW

TRACKING PINGER

\ VELOCIMETER

DOPPLER
SONAR
TRANSDUCERS
GYRO COMPASS

VERTICAL GYRO

1
'
X-Y PLOTTER '
i]

PRESSURE
TRANSDUCER

Launch/Retrieval Apparatus
(See sea state above.)

Tracking and Navigation

Tracking of DEEP QUEST was outlined
under Acoustics above and is utilized to vector
DEEP QUEST to desired locations as well as
to track her movements. Three systems are
available aboard DEEP QUEST for naviga-
tion independent of the surface (Fig. 2.8). The
first system consists of a gyrocompass (provid-
ing heading azimuth which is further cor-
rected to true heading by a vertical reference
gyro and the navigation computer), a Doppler
sonar log (provides vehicle speed relative to
the bottom), and an analog computer which
processes the direction and speed information
and plots the vehicle’s course on an x-y plot-
ter, as well as presenting the information to a

CTFM SONAR
CRT DISPLAY SCOPE

‘ TRANSPONDER

>
\

2 .
m Vy
WZ
w 1%
\
~

\

TRANSPONDER \

TRANSPONDER

Fig. 2.8 DEEP QUEST’s navigational components.

data recorder. The second system uses gyro-
compass or remote reading magnetic compass
(Magnesyn) heading and flowmeter speed (or
odometer distance) through the water to ob-
tain a manual navigational track. A third
system utilizes the laterally-trainable Straza
Model 500 CTFM sonar mounted on the sail
which transmits and receives sonar signals
and generates both audio and visual outputs
in the pressure hull and, in addition, provides
a cathode ray tube with digital readout of
range to a target. Using fixed bottom. objects
as landmarks or range and bearing of
transponders placed on the sea floor, DEEP
QUEST can employ the CTFM to obtain a plot
of its progress relative to them. By using a
down-looking depth sounder/strip chart re-
corder and upward-looking depth sounder in
conjunction with the CTFM and transponders,
accurate post-dive navigational charts may be
constructed.

The DEEP QUEST submersible system is
one of the most sophisticated in existence and
was designed to accomplish such diverse tasks
as research, surveying, engineering, search
and retrieval, diver support and rescue. Rela-
tive to the shallower diving submersibles, it
may appear unduly complex. Undoubtedly,
one can do without a great number of DEEP
QUEST’s capabilities if the operational tasks
are merely for viewing and simple work func-
tions. The trade-offs are obvious: The simpler
the submersible, the simpler the tasks it may
perform. Nonetheless, the basic design and
operational aspects outlined above must be
confronted and solved by all submersibles to
varying degrees; where one or several of these
functions have been slighted—and no sub-
mersible is without fault—the weakness is
apparent.

A common weakness, undoubtedly the most
crucial obstacle to wide-scale submersible em-
ployment, resides in the operational concepts.
Possibly influenced by independently-operat-
ing, self-sufficient military submarines, sub-
mersible architects have tended to overlook or
underestimate the critical role played by sur-
face craft in supporting extended open-sea
operations. In the formative years, the many
technical problems of deep submergence over-
shadowed this surface dependency, but, once
they were solved and submersibles routinely
dived without crippling malfunctions, inade-

quacies of surface support came into proper
perspective and still plague vehicle owners.
Future submersible designers must, if they
hope to achieve more effective diving records,
be cognizant of the fact that small, maneuver-
able, battery-powered vehicles are inextrica-
bly bound to their surface support platform
for safety, sustenance and operational effi-
ciency.

REFERENCES

1. King, D. A. 1969 Basic hydrodynamics. in
Handbook of Ocean and Underwater
Engineering, McGraw-Hill Book Co., New
York, p. 2-1 thru 2-32.

2. Warren, W. F. 1961 Seawater Density in
the Ocean as a Function of Depth and a
Method of Utilizing This Information in
the Design of Pressure Vessels Which
Will Remain in a Constant Depth Range
Between the Surface and Bottom. Naval
Ord. Lab. NOLTR 61-179, AD 273634.

38. McQuaid, R. W. and Brown, C. L. 1972
Handbook of Fluids and Lubricants for
Deep Ocean Applications. Naval Ship Re-
search and Development Lab., Annapolis,
Md., Rept. MATLAB 360, 249 pp.

4. Busby, R. F. 1967 Undersea penetration
by ambient light and visibility. Science,
v. 158, n. 3805, p. 1178-1180.

5. Encyclopedia of Oceanography 1966 Ency-
clopedia of Earth Science Series, v. 1,
edited by R. W. Fairbridge, Reinhold Pub.
Corp., New York.

6. Personal Communication with A. Markel,
Reynolds Submarine Services, Inc.,
Miami, Florida.

7. Lockheed Missiles and Space Corp. 1967
DEEP QUEST Summary Description.
LMSC No. 5-13-67-3, Sunnyvale, Califor-
nia.

8. ————,, 1968 Lockheed DEEP QUEST
Submersible System. LMSC/DO80197, Re-
vision B, Sunnyvale, California.

9. ————,, DEEP QUEST Research Subma-
rine. LMSC/DO15168 (unpub. manuscript).
10. ————_, DEEP. QUEST-The Versatile

Submarine. Ocean System Marketing
(Sales Brochure), Sunnyvale, California.

11. Shumaker, L. A. 1972 New Developments
in Deep Submersible Operations (unpub.
manuscript).

TABLE 2.1 SEA STATE CHART

Wind and Sea Scale For Fully Arisen Sea

Sea-General Wind Sea

Wave Significant Range
(Beaufort) Range Height Feet — of Periods
Description Wind Force Description (Knots) Average (Seconds)

Sea like a mirror. Calm

Ripples with the appearance of scales are formed, but without Light
foam crests. Airs

Small wavelets, still short but more pronounced. Crests have a Light
glassy appearance and do not break. Breeze

Large wavelets. Crests begin to break. Foam of glassy ap- Gentle
pearance. Perhaps scattered white caps. Breeze

Small waves becoming longer; fairly frequent white caps. Moderate
Breeze

Moderate waves, taking a more pronounced long form; many Fresh
white caps are formed. (Chance of some spray.) Breeze

Large waves begin to form; the white foam crests are more Strong
extensive everywhere. (Probably some spray.) Breeze

Sea heaps up and white foam from breaking waves begins to Moderate
be blown in streaks along the direction of wind. (Spindrift Gale
begins to be seen.)

Moderately high waves of greater length; edges of crests
begin to break into the spindrift. The foam is blown in
well-marked streaks along the direction of the wind.
Spray affects visibility.

High waves. Dense streaks of foam along the direction of
the wind. Sea begins to “‘roll’’. Spray may affect visibility.

Very high waves with long overhanging crests. The resulting
foam, in great patches, is blown in dense white streaks
along the direction of the wind. On the whole, the surface
of the sea takes a white appearance. The rolling of the sea
becomes heavy and shock-like. Visibility affected.

Exceptionally high waves (small and medium-sized ships might
be for a time lost to view behind waves). The sea is completely
covered with long white patches of foam lying along the direction
of the wind. Everywhere the edges of the waves are blown into
froth. Visibility affected.

Air filled with foam and spray. Sea completely white with driving Hurricane 10-(35)
spray; visibility very seriously affected.

29

CONTEMPORARY SUBMERSIBLE

DEVELOPMENT

As surface craft progressed century-by-
century from muscle, through sail, steam,
diesel-electric and nuclear power, peaceful
undersea explorers merely dabbled beneath
the surface from cable-suspended spheres
and open-bottomed diving bells. Then, in less
than a score of years, mankind virtually
leap-frogged to the greatest known ocean
depths and produced an astounding array of
undersea vehicles for science, industry and
recreation.

One interested in undersea history cannot
help but wonder: Why the 1960’s? What pres-
sures or inducements were then active to
encourage investment of millions of dollars
in undersea exploration that were not pres-
ent earlier in the twentieth century, or, for

31

that matter, in any earlier period? Undoubt-
edly, economic gain was the major underly-
ing motive, but what made several giant
American corporations and numerous small
companies and individuals believe there was
a market or need for such capabilities? There
is no single factor that prompted this surge
of activity; instead, the influences of several
separate and concurrent events were at
work; for example:

—A demonstrated technological ability
to reach the greatest known ocean
depth in 1960,

—A space program amounting eventu-
ally to $35 billion,

—Loss of the U.S. Navy nuclear subma-
rine THRESHER -resulting in a pro-

gram recommending large sums for
deep submergence,

—Increasing Federal funding for oceano-
graphic programs,

—An oil industry moving farther out and
deeper into the sea,

—Scientific reports detailing the many
results and advantages of ocean study
from manned submersibles,

—Serious scientific desire to study the
deep sea in situ,

—A burgeoning market in recreational
undersea diving,

—A military interest in materials and
techniques for deep submergence vehi-
cles,

—Increased recognition of mineral re-
sources and ever dwindling terrestrial
resources,

—Forecasts by military and government
officials and private industry of the
promising aspects for deep submers-
ibles, and

—Individual awareness of the grandeur
and beauty of the deep sea through
tasteful and exciting cinematic and tel-
evision productions.

To varying degrees, these events and pres-
sures worked to produce a 1970 worldwide
fleet of over 100 shallow and deep submers-
ibles—up from less than a handful a decade
earlier. Another factor, impossible to meas-
ure, is the pure desire of man to challenge
and overcome the hostility of the deep ocean.
When he replied “Because it’s there!” to one
inquiring why climb a mountain, Mallory
also offered an explanation for many who
challenge the abyss.

BATHYSPHERE TO BATHYSCAPH
(1934-1960)

“When once it (the deep ocean) has been
seen, it will remain forever the most vivid
memory in life, solely because of its cosmic
chill and isolation, the external and abso-
lute darkness and the indescribable beauty
of its inhabitants.”

So wrote naturalist William Beebe (1) in
describing the events leading to his record-
breaking, 3,028-ft dive in 1934.

Before Beebe and his engineer associate,
Otis Barton, descended to this unprece-
dented depth, man’s involvement with the

32

deep ocean reached a maximum of 600 feet
(2); this was with the aid of heavy metal
diving suits which reportedly seized or con-
tracted arthritis at the joints within a few
hundred feet of depth.

Barton’s BATHYSPHERE (a word coined
by Beebe meaning deep sphere) was a single
spherical steel casting 54 inches in inside
diameter and 1'/2 inches thick. The 22/2-ton
sphere was supported on deck by a set of
wooden skids (Fig. 3.1). A 14-inch-diameter
entrance hatch was sealed by a 400-pound
steel door bolted to the sphere. Watertight
integrity between door and sphere was ac-
complished by a circular metal gasket fitting
into a shallow groove and packed with white
lead to prohibit leaking at shallow depths.
Three viewports were available, although
only two were used; these were composed of
fused quartz glass 3 inches thick and 8
inches in diameter. The third viewport was
sealed with a metal plug when spare win-
dows were subsequently exhausted. Oxygen
was carried in the sphere in two 80-gallon-
capacity tanks at 1,800 psi and automatically
bled into the cabin. Carbon dioxide was re-
moved by circulating air through soda lime
and calcium chloride was carried to control
humidity.

The BATHYSPHERE was lowered from the
surface on the end of a non-twisting steel-
core cable of 29-ton breaking strength. A
second cable served as a conductor for a
telephone and two lights, which were aimed
through a viewport for external illumination.
The power cable was tied by rope to the lift
cable at intervals and passed into the pres-
sure sphere through a stuffing box. Power
for the lights was provided by a surface
generator and a battery supplied the tele-
phone power. In the event of telephone fail-
ure, an arrangement was made whereby a
light in the sphere could be keyed from above
to signal; a further arrangement made it
possible to key a light on deck from within
the pressure sphere.

Built in 1929 by Barton, and donated by
him to the New York Zoological Museum in
1940, the BATHYSPHERE progressively
made record dives over a 4-year period off
Bermuda. Beebe’s purpose in these dives
was to pursue his studies of deep-sea orga-
nisms which he began several years earlier

Fig. 3.1 Internal arrangement of the bathysphere of 1934. From left to right—Chemical apparatus with its blower;
four trays and pan; oxygen tank and valve; telephone coil and battery box—the telephones are plugged into this box
and it is connected by the wire shown on the two hooks above the oxygen valve, with the telephone wires in the
communication hose; thermometer-humidity recorder, and below it the left hand sealed window; barometer;
switch-box at top of sphere; central observation window, immediately below switch-box; oxygen tank and valve;
searchlight. The communication hose is shown as it enters the bathysphere through the stuffing-box. [From Ref. (1)]

33

from a laboratory on Nonsuch Island. Finan-
cial support came from both the Zoological
Museum, where he was Director of the De-
partment of Tropical Research, and later
from the National Geographic Society.

Beebe’s accounts of BATHYSPHERE’s
dives in Half Mile Down are exciting, in-
formative and extremely readable. Indeed,
his voyages aroused public interest to the
point where his narrative during the 1,500-
to 2,200-foot portion of a dive on 23 Septem-
ber 1932 was transmitted live to the United
States and Europe by the National Broad-
casting Corporation. Professor Beebe in the
1930’s and 40’s was as familiar an undersea
figure as Jacques Cousteau would be a score
of years later.

In spite of Beebe’s successes the BATHY-
SPHERE and its mode of operation has sev-
eral deficiencies for the undersea biologist;
some were minor, others were potentially
serious.

—With a weight displacement ratio of
1.49, the BATHYSPHERE would sink
like a rock if the cable broke.

—External pressures squeezed, from
several inches to several feet, the elec-
trical cable into the cabin on each dive.
Packing the cable in ice to contract it
before tightening down on the stuffing
box alleviated this problem somewhat.

—A voltage drop from 110 V to 75 V
caused by the resistance in 3,600 feet
of cable reduced the lights’ candle
power (2,628 to 732) and required
switching to a more powerful genera-
tor for photography. The lights, shin-
ing through the glass viewport, heated
it to a dangerous level.

—The cramped quarters in the 4'/2-foot
sphere made a dive of 31/2 hours almost
the limit of endurance.

—Every up-down motion of the surface
ship was transmitted to the sphere and
only a flat calm allowed a specified
depth to be maintained.

—Although corrected to an acceptable
degree—by packing with white lead lu-
bricant—leakage around viewports
and hatch cover occurred frequently.

The lack of horizontal maneuverability
prompted Beebe to take, what must be con-
sidered, daring measures on shallow reef-
exploring dives. Towed along by the surface

34

ship, and with fixed wooden rudders at-
tached to stabilize the sphere, Beebe ob-
served the bottom at close range and relied
solely on voice command to the ship to raise
the BATHYSPHERE when a vertical obsta-
cle appeared in his path. On one such voyage,
he relates an encounter with a towering
coral head which came perilously close to
colliding with the dangling sphere. One must
stand in awe of these early pioneers, for in
the thirties a parting of the cable, even at
shallow depths, virtually guaranteed a death
warrant.

To one early undersea adventurer, Menotti
Nani, the technical and environmental perils
of deep submergence were apparently inci-
dental. Mr. C. R. Vincent, an early 1930’s
metal alloys fabricator of Newark, New Jer-
sey, was approached by Mr. Nani to con-
struct a 300-ft, 1-man submersible of his de-
sign. Mr. Vincent, now of Houston, Texas,
recently related this experiment in a Febru-
ary 1974 issue of “The Ensign” and called
the little boat another ‘“‘Novelty of the
Depression Era.” Constructed almost en-
tirely of Krupp stainless steel, the submers-
ible (Fig. 3.2) had four tiny glass viewports
aft and relied upon the ejection of com-
pressed air for propulsion. Mr. Nani’s origi-
nal intention was to demonstrate the feasi-
bility of this type of submersible for observa-
tion and, with modifications, submarine res-
cue. But, except for a few test dives in the
Passaic and Hudson Rivers, the prototype
never realized its potential and slipped qui-
etly into obscurity. Its demise, however,
could not be attributed to lack of daring on
Mr. Nani’s part, for at one point his plans
envisioned riding in the submersible as it
was dropped from the George Washington
Bridge. The New York City police, however,
considered the plan to be without scientific
merit and refused permission.

In spite of the high public interest and
many scientific revelations of the BATHY-
SPHERE, a period of deep-sea inactivity fol-
lowed its successful dives. To the clairvoy-
ant, a hint of where the next activity might
arise could have come from the many refer-
ences by Beebe to the stratospheric balloon-
ing accomplishments of a Swiss physicist, Au-
guste Piccard, who displayed a keen interest
in Beebe’s dives.

Fig 3.2 Inventor Menotti Nani waves a grim goodbye as he prepares for a plunge into the Hudson River. (Mr. C. Richards Vincent, Houston, Tex.)

Piccard, a towering, innovative research
scientist, was interested in the study of
cosmic rays, and, because of the earth’s pro-
tective atmosphere, designed a stratospheric
balloon to carry him and his instruments
above the atmosphere for unhindered meas-
urements. On August 18, 1932, the Professor
ascended from Zurich to a world record 72,-
177 feet. Financed by the Belgium National
Fund for Scientific Research or Fonds Na-
tional de la Recherche Scientifique (FNRS),
the balloon was named FNRS, and in 1933 its
gondola hung prophetically over the BATHY-
SPHERE in the Hall of Science of the Cen-
tury of Progress Exposition at Chicago.

Beebe was a biologist whose major interest
in the BATHYSPHERE was its ability to

35

provide him with a better means to conduct
his studies; he was a user of technology, not
a developer. Piccard, on the other hand, be-
came a developer of technology and a user of
the laws of physics. His initial interest was
cosmic ray study which forced him to modify
and apply the stratospheric balloon in the
same manner that Beebe applied the BATH-
YSPHERE. Subsequently, he developed a ve-
hicle the marine scientist could use to pene-
trate the oceans as he did the atmosphere
(3). The seed of this undersea vehicle germi-
nated for some time in the Professor’s mind,
and in 1939 the FNRS granted him some $25
thousand to construct a bathyscaph or deep
boat, christened FNRS-2. But before he pro-
gressed into the actual construction stage,

World War II intervened and halted all
thoughts of peaceful research.

At the commencement of WWII the follow-
ing state-of-the-art existed in military and
other undersea circles: Diesel-electrie sur-
face-powered military submarines were oper-
ating at a maximum depth of 312 feet and,
under normal conditions, stayed underwater
some 20 hours using what air was in the boat
when the hatches were closed. Lithium hy-
droxide was scattered throughout the sub-
marine for carbon dioxide absorption if the
situation warranted. Ambient-pressure div-
ing, i.e., where the diver is exposed to sea
pressure and not inside a pressure-resistant
suit or capsule, had progressed to the stage
where 243-foot dives, breathing helium-oxy-
gen, were a practicality (4). Earlier subma-
rine disasters in 1925 (USS S-51) and 1927
(USS S-4) demonstrated the need for devel-
opment of better diving techniques and res-
cue devices. In conjunction with the Bureau
of Mines, the U.S. Navy’s Bureau of Con-
struction and Repair began investigations
into all aspects of prolonged deep-diving at
ambient pressure. This work progressed to a
point where an Experimental Diving Unit
was established in Washington, D.C., in 1927,
which went on to develop chambers for res-
cuing trapped submariners, as well as de-
compression tables and gas mixture for di-
-vers. The benefits of this research paid off in
1939 when the USS SQUALUS went down in
243 feet of water off the Isle of Shoals in the
North Atlantic. Forty of the trapped crew
were rescued by the newly developed rescue
chamber and with the assistance of divers
breathing helium-oxygen.

Ambient pressure diving up to 1943 was,
BATHYSPHERE-like, tethered to the sur-
face for support in the form of air and verti-
cal movement. Devices did exist for the diver
to carry his own oxygen or air supplies, but
oxygen is toxic at depths greater than about
35 feet, and the compressed air device, in-
vented by a French Naval officer, Com-
mander Le Prier, in 1925, released a diver-
regulated, continuous fiow of air into a face
mask which, by design, imposed very short
diving limits.

In 1943 another French Naval officer,
Jacques Cousteau, teamed with engineer
Emil Gagnan and produced the demand reg-

36

ulator to provide air from tanks only when
the diver inhaled and automatically in-
creased the air pressure to equalize pres-
sures inside the body with water pressure
outside. The demand regulator and the imag-
inative artistry of Cousteau later produced a
revolution in the field of recreational and
commercial diving.

With the close of hostilities, Piccard once
again asked for, and received, the pre-war
funds allocated for FNRS-2. FNRS-2 served
as the prototype for all future bathyscaphs.
Its purpose was to dive deep (10,000 ft origi-
nally), allow the passengers to view outside,
range about the bottom and to do so with no
cable to the surface and with a wide margin
of safety.

In many respects, FNRS-2 was a reversal
of the principles which made FNRS soar. The
pressure sphere, with a W/D ratio greater
than 1, would sink unless restrained; the
Professor constructed an oval-shaped, thin,
metal-walled float wherein six compartments
held 6,600 gallons of gasoline which, being
lighter than water, would float and hold the
cabin (Fig. 3.3) at the surface.* Gasoline was
valved off by the pilot to begin the descent,
and water immediately replaced the gasoline
to maintain a pressure within the tanks
equal to that without. FNRS-2 carried sev-
eral tons of iron shot in steel tanks which
were restrained from dropping by doors held
closed with electromagnets. In the event of a
complete power failure, the doors opened and
dumped all shot. Similarly, other tanks held
scrap iron and gravel for additional ballast
which also jettisoned in the “fail-safe”? man-
ner. The iron shot could be dumped incre-
mentally to slow down descent or increase
ascent. A 7-foot-long cable attached to the
sphere held a 100-kilogram (wet weight) flat-
iron-shaped concrete clump which served to
hold FNRS-2 in stable equilibrium just off
the bottom.

Instead of a cable to the surface, FNRS-2
carried its own power in the form of two lead-
acid storage batteries which ran two 1-horse-
power motors (mounted port and starboard
at the base of the float). External lights were
provided for viewing and a carbon dioxide
removal system and oxygen were carried
within the pressure sphere. The motors
served to provide a measure of horizontal
maneuverability for bottom exploration.

Fig. 3.3. Bottom view of FNRS-2 showing pressure sphere and float. (Jacques Piccard)

The pressure sphere was larger than the
BATHYSPHERE (6-ft 7-in. diam.) and was of
two cast-steel (Ni-Cr-Mo) hemispheres bolted
together at an equatorial flange. Entry
through the hatch was made while FNRS-2
was on deck; once the passengers were in-
side, there was no way for them to get out
unless the bathyscaph was lifted clear of the
water.

Of the many innovations produced by Pic-
card, the viewports of FNRS-2 stand out as
truly significant. Having witnessed the
BATHYSPHERE’s problem with cracking
and chipped glass, Piccard, as early as 1939,
teamed with countryman Professor Guiltisen
and produced a conically-shaped window of
acrylic plastic 5.91 inches thick, 15.75-inch
outside diameter and 3.94-inch inside diame-
ter. The conical shape offered wide-angle
viewing (Fig. 3.4) and plastic, unlike glass,
does not fail catastrophically; instead, it de-
forms elastically and passes on excess stress
to its adjacent parts. This configuration and
plastic are the bases of all submersible view-

Fig 3.4 Professor Auguste Piccard inspecting an acrylic plastic viewport, one of his
many contributions to deep submergence. (Jacques Piccard)

ports today except for the Japanese submers-
ible KUROSHIO II.

Other technological areas where the
FNRS-2 pioneered was in the pressure com-
pensation of its batteries and the design of
thru-hull electrical penetrations; both are
discussed more fully in Chapter 6. As he
explained in In Balloon and Bathyscaphe
(3), Piccard did not consider deep diving a
particularly dangerous undertaking as long
as one complied with the applicable laws of
physics and added a margin for safety. Con-
sider, for example, the pressure sphere
which had an operating depth of 2.5 miles
and a collapse depth of 10 miles, and the
plastic viewports which would only deform
permanently at a computed ocean depth of
18%/s miles. There are so many areas in which
the innovative Swiss physicist laid the
groundwork for future deep submergence ve-
hicles that a mere listing would not do jus-
tice to his accomplishments. Not only did he
solve a great many technical problems, but
he also identified those areas where addi-
tional research was required. More impor-
tantly, his efforts and subsequent narratives
served to galvanize the marine engineering
community into thinking of the problems of
deep submergence and the oceanographer
into thinking of its benefits. For this, con-
temporary participants of deep submergence
are indebted.

On the 26th of October 1948, FNRS-2 made
its first test dive to 84 feet off Cape Verde
with Piccard and French biologist Dr. Theo-
dore Monod aboard. The program called for
an unmanned dive, which was subsequently
conducted to 4,544 feet on the 3rd of Novem-
ber, and, when FNRS-2 surfaced, Piccard
met with a problem neither he nor his suc-
cessors have solved successfully: Heavy
weather. With seas too high for its support
ship SCALDIS to retrieve it, the float was
emptied of gasoline after a few hours of
ponderous towing and replaced with carbon
dioxide, but even so, the float, not designed
for towing, was so damaged that further
diving was precluded. A few weeks earlier,
Otis Barton took an improved bathysphere
called BENTHOSCOPE down to 4,488 feet off
Santa Cruz Island, California.

The French Navy, who lent a great deal of
assistance to Piccard in 1948, was presented

38

the FNRS-2 in 1950 as an apparent result of
disenchantment with bathyscaphs on the
part of the Fonds National. At Toulon, the
French made several modifications to the
newly-designed FNRS-3; the most important
being a new float designed for towing and a
chute-like affair leading down to the original
pressure sphere within which the occupants
could enter or leave the cabin with the vehi-
cle in the water. FNRS-3 began diving under
the command of Captain George Houot (5) in
June 1953 and by February 1954 reached the
unprecedented depth of 13,700 feet in the
Mediterranean Sea.

Still undaunted, Professor Piccard, now
joined full-time by his son Jacques, pressed
on with his concept. With financial aid from
the Swiss government and technical assist-
ance and grants from Italian industry in the
city of Trieste, they once more began their
quest for depth in the form of the new bathy-
scaph TRIESTE in the spring of 1952. On the
first of August 1953 the bathyscaph was
launched.

The diving principles for TRIESTE were
identical to those of FNRS-2; the major mod-
ifications were in dimensions, capabilities
and, particularly, in the float, now designed
for surface towing. Specifically, the following
modifications took place:

—The pressure sphere was the same di-
mension as that of FNRS-2 but was of
forged steel—stronger and more malle-
able than cast steel.

—Electrical power was from silver-zine
batteries carried in the pressure
sphere.

—The viewport in the hatch, now on
hinges, could be used to view exter-
nally owing to installation of a plastic
window in the access trunk. (FNRS-2’s
hatch viewport was blocked by the ap-
paratus holding the hatch in place.)

—The float held almost four times as
much gasoline (22,600 gal) as FNRS-2,
was stronger and was cylindrically
shaped with a keel for better towing
characteristics. A floodable vertical ac-
cess trunk ran through the float to the
sphere for ingress/egress to the cabin
when TRIESTE was afloat. Tanks fore
and aft in the float could be filled with
air on the surface to attain greater
free-board.

These and many other improvements carried
TRIESTE to 10,392 feet by September 1954
off Ponza, Italy.

In 1957 the U.S. Navy’s Office of Naval
Research provided funds for a series of 26
dives by its civilian oceanographers and na-
val officers out of TRIESTE’s home port of
Castellemare (6). Encouraged by this new
approach to deep-sea studies, the Navy pur-
chased TRIESTE in 1958 from Auguste Pic-
eard for $250,000 (7) and transported it to
San Diego, California where it came under
control of the Navy Electronics Laboratory
(now the Naval Undersea Center). At NEL,
TRIESTE received a facelifting in the form
of a new pressure sphere, built by the Ger-
man firm of Krupp, which allowed it to oper-
ate to a depth of 36,000 feet (the Terni sphere
was limited to 20,000 feet) and an increase in
the float of 6,200 gallons to accommodate the
new 28,665-pound sphere (8).

By mid-October 1959 TRIESTE (Fig. 3.5)
was fully assembled and made ready for its
first deep-sea dives off Guam under the aegis
of Project NEKTON. The French-held record
by FNRS-3 fell on 15 November 1959 with a
dive to 18,105 feet with Jacques Piccard and
NEL biologist, Dr. Andres Rechnitzer,
aboard TRIESTE. Eight dives later, on 8
January 1960, a 22,560-foot dive by Piccard
and Navy Lieutenant Don Walsh saw this
record fall, and on the next dive, Piccard and
Walsh reached the very bottom of the Chal-
lenger Deep: 35,800 feet on 23 January
1960—the contest was over. TRIESTE dem-
onstrated that any ocean depth could be
safely reached. The drama of these early
years is presented in detail by Auguste Pic-
card (3), Captain Houot (5) and Jacques Pic-
ecard (9) in their books which chronicle the
pioneering events leading up to the 1960
dive; for this reason the many technical
problems and discouragements along the
way are left out of the preceding account.

Just north of TRIESTE’s earlier port at
Castellemare was a little noticed effort to
build a deep-diving vehicle, but in this case
the Italian builder, Pietro Vassena, intended
to build a submersible for the recovery of
wrecked ships (10). The submersible (Fig. 3.6)
was constructed from a “torpedo snorkel”
submarine built during the war. As early as
13 March 1948, Mr. Vassena and a companion

Fig 3.5 TRIESTE just prior to its Deep Dive. (Larry Shumaker)

Fig. 3.6 Pietro Vassena in the conning tower of his submersible for the recovery of
wrecked ships. (Gianfranco Vassena)

reached a depth of 1,234 feet in Lake Como,
but later, on an unmanned test dive, a lift
cable broke and it was lost.

Elsewhere throughout the world, submers-
ible activity in the 1950’s was minimal. Not
surprising, Japan, a country dependent upon
the sea for 64 percent of its protein needs (2
percent in the U.S.), was an early user of
submersibles. While Beebe dived to provide
biological information of an academic nature,
Dr. Naoichi Inoue, Head of the Faculty of
Fisheries at Hokkaido University, initiated
design and construction of the BATHY-
SPHERE-like KUROSHIO (Fig. 3.7) to inves-
tigate a major factor in his country’s nu-
trient resources. By 1960 the 650-ft, 3-man
KUROSHIO conducted 380 dives for benthic
(bottom dwelling) and nektonic (free-swim-
ming) fisheries studies off the coast of Japan.
Retired in 1960, KUROSHIO was replaced in
the same year by KUROSHIO II, a larger,
maneuverable, more capable successor to its
earlier namesake.

In the United States two submersibles ap-
peared in the fifties: SUBMANAUT and
COLDFISH. Built by Martine’s Diving Bells,
Inc., of San Diego, California, SUBMANAUT
(Fig. 3.8) used diesel/electric power on the
surface and batteries while submerged. Orig-
inally designed for an operating depth of
2,500 feet, installation of a 3-inch-thick, 13-
foot-long, plastic wrap-around window for
photography decreased its capability to 600
feet. Launched in 1956, SUBMANAUT shot
underwater films for various movie compa-
nies before it was shipped to Miami, Florida
in 1958 from where it traveled to the Baha-
mas, Cuba, Italy and Bermuda to shoot other
movie and television footage. In military
submarine fashion, SUBMANAUT made sev-
eral journeys, e.g., Miami to the Bahamas,
on the surface under its own diesel/electric
propulsion. In its most notable assignment,
SUBMANAUT was featured in the MGM
movie Around the World Under the Sea (11).

The shallow diving (100-ft) GOLDFISH was
the 1958 creation of an ex-Navy submariner,
Mr. Burt Dickman of Auburn, Indiana.
GOLDFISH was a prototype submersible for
investigating and photographing insurance
claims on sunken vessels, but it never real-
ized this potential although it carried sev-

Fig. 3.8 Edmund Martine’s SUBMANAUT used diesel engines for surface power
and batteries when submerged. (Edmund Martine)

eral hundred people into various Indiana
lakes over the next 10 years.

Displaying remarkable foresight in the re-
quirements for manned submersibles,
Jacques Cousteau, as early as 1953, began
design on the 1,000-foot, small, maneuvera-
ble DIVING SAUCER (Fig. 3.9) which was
launched in 1959. Cousteau’s desire was to
build a submersible from which scientists
could observe and photograph oceanographic
phenomena in comfort and with a degree of
access to undersea valleys and narrow can-
yons not attainable by the large, cumber-
some bathyscaphs. Cousteau dived several
times in FNRS-3 and saw the weak and
strong points of the underwater elevator.
Several bathyscaph features, such as conical,

Fig. 3.9 Cousteau’s DIVING SAUCER. The forerunner of Bathyscaph progeny.
(Westinghouse)

POWER & TELEPHONE
CABLE—CANVAS COVERED

SEARCHLIGHT GUARD
STROBE LIGHT
500 W SEARCH LIGHT
SEARCH LIGHT TURNING &
ELEVATING CONTROL HANDLES
CLOCK
TELEPHONE
BOURDON-TYPE DEPTH GAGES
HYDROPHONE RECEIVER
ADJUSTABLE MIRROR
SIX INCH
OBSERVATION WINDOW
FREE GYRO (ELECTRIC)
OBSERVER
SEARCHLIGHT
POWER CONTROL
CAMERA PEDESTAL

A SWIVEL
0 ADJUSTABLE SLINGS
HATCH COVER COUNTER WEIGHT
SUBMARINE-TYPE HATCH
INFRARED LIGHT
FOUR INCH OBSERVATION WINDOW
ASSISTANT
MAIN SWITCHBOARD
TELEPHONE
OXYGEN BOTTLE
FOUR INCH OBSERVATION
WINDOW
STROBE-LIGHT CONTROLLER
SONAR (ECHOSOUNDER)

MUD SAMPLING CONTROL
FIN

DUCT AS FISH
FISH CATCHER RESERVOIR
REVOLVING CHAIR ELEVATING
FLOOR RUDDER
MOTOR-GENERATOR FOR GYRO aN =) ie BUOY ROPE
<a) (EMERGENCY
PROPULSION MOTOR A y)
cS LIFTING WIRE)
SONAR TRANSDUCER CS . scREW PROPELLER
TURNING GEAR ~O< SoHo ce
STROBE LIGHT & SPOTLIGHT p>— ; PROPULSION
FOUR INCH Namen MOTOR STARTER
OBSERVATION WINDOWS TRANSFORMER
Sealy ee

MUD SAMPLING DEVICE
EMERGENCY RELEASING DEVICE

BUOY ROPE
(EMERGENCY
LIFTING WIRE)

VENTILATING FAN

AIR RECONDITIONING UNIT
ROLLER BEARING

WOODEN SKIDS

MAIN CABLE &
TELEPHONE WIRE

“KUROSHIO”

Fig. 3.7 KUROSHIO |. (Courtesy of N. Inoue)

plastic viewports and pressure-compensated
batteries went into the DIVING SAUCER,
but the high degree of transportability, com-
fort, better viewing, and maneuverability
were new to the submersible scene. The first

pressure hull, a disc-shaped, 6-foot 7-
inch-diameter, 5-foot-high, positively-buoy-
ant, steel structure was lost in 3,000 feet of
water off Cassis in 1967, during an un-
manned test dive, when the lowering cable

41

snapped. A cable-suspended weight carried
the hull to 3,300 feet. Six years hence, Cous-
teau reports seeing the hull on an echo soun-
der ‘floating at anchor” 30 feet above the
bottom. A second hull was completed, and
DIVING SAUCER (SP-350) commenced div-
ing in 1959 in the Caribbean from its support
ship CALYPSO which carried a stern-
mounted, 10-ton, articulated, hydraulic
“Yumbo” crane. This was the first open-sea
“submersible system.” With DIVING SAU-
CER in the hold of CALYPSO, the submers-
ible could be transported safely for long dis-
tances at 12 knots, deployed and retrieved at
the diving site with the Yumbo crane and
repaired or maintained at sea in the support
ship’s hold. At the sacrifice of great depth
capability, Cousteau brought flexibility and
wide-ranging to submersible operations.
Cousteau believed speed to be the enemy of
observation; he described the slow-moving
(0.6-knot cruising speed) DIVING SAUCER as
«" . . a scrutinizer, a loiterer, a deliberator, a
taster of little scenes as well as big. She gave
us six-hour periods in which to study accu-
rately the things below” (13).

In one case DIVING SAUCER pushed tech-
nology beyond its limits; the case being its
original nickel-cadmium batteries which
short-circuited and burned early in the test
dives. The reason lay in the batteries’ pres-
sure-compensated fiberglass boxes which
were poor heat conductors and allowed the
compensating oil to reach boiling point from
battery-generated heat. Brass battery boxes
with gas exhausts replaced the fiberglass
boxes, but gasses generated in the new boxes
and they too exploded. Conventional lead-
acid batteries replaced the nickel-cadmium
cells, and DIVING SAUCER proceeded to
dive with little further trouble from this
source.

So far as can be determined, DIVING SAU-
CER was also the first to use the positively-
buoyant pressure hull itself as a “fail safe”
mechanism. At submerged trim, the sub-
mersible was neutrally buoyant; to surface, a
55-pound iron weight was mechanically
dropped and DIVING SAUCER rose bubble-
like to the surface.

The submersible scene, when TRIESTE
ushered in the decade of the 60’s with its
record dive, may be described as “simmer-

42

ing.”” The achievement of record depth by
TRIESTE was duly noted in the press and
trade journals, but the space program in the
United States completely dominated re-
search development programs. The Federal
financial climate, however, was friendly to-
wards other exploration-technologic endeav-
ors.

PRE- AND POST-THRESHER
(1960-1965)

In the years 1960 through 1963 eleven new
submersibles appeared; their intended pur-
poses varied, but they were all relatively
small (2-man) and shallow diving (less than
600-foot operating depth); the exception
being the French Navy’s bathyscaph AR-
CHIMEDE, a 1961 replacement for the aging
FNRS-3. Capitalizing on the lessons learned
from FNRS-3, ARCHIMEDE could dive to
any known ocean depth; its power supply
was increased for greater maneuvering; the
pressure sphere was enlarged to accommo-
date more research instrumentation; and its
float was designed for towing at speeds up to
8 knots.

In these early sixties, private industry’s
incentive to build a submersible is not en-
tirely clear. In the case of government-
owned vehicles (KUROSHIO II, AR-
CHIMEDE) the incentive is clearer: KURO-
SHIO II was built to specifically investigate
a national food resource; ARCHIMEDE’s
purpose was to pursue deep-water scientific
studies and to conduct recovery tasks of mili-
tary significance. From the limited depth
and specific tasks, such as recreation, instru-
ment test platform and insurance claims, the
impetus for construction seems almost per-
sonal. In some instances, however, it appears
that a few larger corporations sensed a new
market in the offing. One must remember
that the time it takes for the idea to become

_ reality in the submersible business can be

considerable. So when a large, complex vehi-
cle, such as ALUMINAUT, is launched in
1964, the influencing forces and decision to
build predate launch by several years.
Fifteen years had passed since the end of
WWII, and the written (14) and photographic
accounts by Cousteau and his associates on
the beauty of the sea and religious-like ambi-

ence of scuba diving, plus the commercial
availability of relatively inexpensive diving
gear, produced an annual invasion of the sea
by newly-trained recreational divers at an
ever-increasing rate.

Beginning in 1961 with the first SPORTS-
MAN 300 and in 1963 with SPORTSMAN
600, both sometimes referred to as AMER-
SUB’s (15), the American Submarine Co. of
Lorain, Ohio constructed shallow one- and
two-man submersibles aimed at the recrea-
tional market (as their name implies) as well
as government and other commercial activi-
ties. Various reports allude to 20 or more of
this class having been constructed (16), but
documentation is lacking.

A diving enthusiast himself, Florida news-
paper publisher, John H. Perry, Jr., believed
that a need existed for recreational submers-
ibles to provide protection from sharks and
other predators. In 1962 Perry manufactured
his first successful “recreational” submers-
ible (the third one built), the 150-ft, 1-man
Perry CUBMARINE (at one point called SUB
ROSA), later designated PC3-X (Fig. 3.10).
But he soon abandoned the recreational goal
and felt the market showed a need for indus-
trial and scientific undersea ‘‘workboats;” to
this end he produced the 600-ft, 2-man PC-
3B in 1963. Perry advanced from a “backyard
builder” hobbyist in 1950-1960 to a profes-
sional submarine builder—today the full-
time producer of 12 submersibles of varying
depths and capabilities and numerous diving
capsules and several undersea habitats. In
the process Perry Submarine Builders of Ri-
viera Beach has become the largest single
producer of manned submersibles in the
world. But the impetus towards this produc-
tion began with the assumed need for a
recreational vehicle.

At Long Beach, California, the first “gen-
eral utility” submersible (17) SUBMARAY ap-
peared in 1962. The 2-man, 300-ft-depth vehi-
cle laid claim to a wide range of capabilities:
“Sea floor surveys, search and recovery, ma-
rine life studies, underwater photography,
undersea research/development, inspection
of pipeline, cables, etc.’”’ Mart Toggweiler was
the first private owner to pursue the indus-
trial and scientific undersea market and, ata
lease cost of $500 daily, his corporation, Hy-
drotech, subsequently reported 180 SUB-
MARAY dives by the spring of 1964.

43

Fig. 3.10 PC3-X, the first of thirteen submersibles built by John Perry of Riviera
Beach, Fla. (Perry Submarine Builders)

More modest capabilities went into the de-
sign of the first, and only, modern wooden-
hulled submersible, SUBMANAUT, built in
1963 by oceanographer James R. Helle of San
Diego. Unlike its earlier steel-hulled name-
sake, this SUBMANAUT was built of 3/4-inch-
thick, laminated plywood “Doughnuts” and
had a design depth capability of 1,000 feet.
The 2-man vehicle was to serve as a test
platform for various electronic devices, e.g.,
pingers, communications systems, developed
by Oceanic Enterprises, a division of Helle
Engineering, Inc.

The same year saw the first, timid-like
entry of large industry into the submersible
field, for up to this point the participants
were either federal governments or private
individuals.

The nation’s largest military submarine
builder, General Dynamic’s Electric Boat Di-
vision at Groton, Connecticut, put forth the
first of its STAR (Submarine Test and Re-
search Vehicle)-class vehicles, the 1-man,
200-ft-depth STAR I.

At this point it is interesting to note that a
number of reports from NEL scientists had
been published detailing the oceanographic
discoveries and advantages of man in situ.
The enthusiasm of the NEL oceanographers
and their Naval officer associates was infec-
tious and generated an optimistic future for
manned underwater research and surveys.
Significant, unique applications of manned
submersibles were coming from a respected
and highly qualified group of oceanogra-
phers and Naval officers (18); their influence
was permeating the “new markets” forecasts
of large American industry.

Indeed, just a year earlier (July 1962)
Westinghouse Electric Corporation an-

nounced plans to build a 12,000-ft DEEP-
STAR as a laboratory facility for its own
undersea studies, and, if enough interest was
shown, they would build further DEEP-
STARS for lease or sale (19). For further
reassurance Electric Boat had only to look in
its own shops where the 51-ft-long, 12,000-ft-
depth, 20-year dream-child of J. Louis Rey-
nolds (20) was under construction. ALUMI-
NAUT, an all aluminum submersible, was
being built to conduct deep-ocean explora-
tion into minerals and food resources and the
salvage of sunken cargo vessels (21). As early
as 1956 design studies at the Southwest Re-
search Institute (22) had begun on ALUMI-
NAUT and the idea was now becoming real-
ity.

Meanwhile, oceanographers at Woods Hole
Oceanographic Institution on Cape Cod were
closely following the construction of the 6,-
000-ft, 3-man submersible ALVIN, being built
at General Mills in Minneapolis. ALVIN
(named after WHOI oceanographer Alyn
Vine) was funded by the U.S. Navy’s Office of
Naval Research and, when completed, would
come under the technical control and opera-
tion of WHOI. The Navy’s interest in deep
submergence was twofold: To demonstrate
the feasibility of new construction tech-
niques, materials and subsystems for possi-
ble application to future military subma-
rines; and to provide civilian and military
oceanographers with a vehicle from which
they, like their NEL counterparts, could con-
duct oceanographic studies applicable to
both military and civil requirements. At an
estimated $1 million, ALVIN would be a rela-
tively inexpensive test platform considering
the $180 million plus cost of the then mod-
ern-day nuclear attack submarines. In addi-
tion, while the materials/eomponents testing
was in progress, an equally important set of
environmental data would be obtained.

To add further promise of a burgeoning
undersea market, in April 1963 the U.S. De-
partment of the Interior asked Congress for
funds to perform a feasibility study on a
nuclear-powered research submarine or
mesoscaph to conduct a wide range of biologi-
cal and geological studies (23). Explaining the
need for such funds, the then Secretary of the
Interior, Stewart Udall, stated:

““‘We need better eyes in the sea; eyes

44

Fig. 3.11 General Dynamics’ STAR / simulates rescue of personnel at 192 feet off
Bermuda. (Gen. Dyn. Corp.)

comparable in power to those with
which scientists are probing outer
space. We need to apply our techno-
logical abilities to more intensive
probing of inner space, the world
ocean.”

With such promising indications did Elec-
tric Boat launch its STAR I (Fig. 3.11) for the
expressed purpose of more clearly defining
the problems inherent in underwater engi-
neering: Materials, structural and hydrody-
namic design, instrumentation, buoyancy,
navigation, control communications and life
support.

For related purposes, the Data and Con-
trols Division of Lear Siegler, Inc., launched
their 600-ft, 2-man BENTHOS V as a test
vehicle for subsystems, particularly in the
area of propulsion.

Into this atmosphere of cautious and hope-
ful anticipation, a tragedy arrived which
brought the field of deep submergence to a
fever pitch. On 10 April 1963 the nuclear

attack submarine THRESHER (SSN-593)
(Fig. 3.12) disappeared in 8,400 feet of water
off the coast of New England and carried 129
men to their death. A Navy task force was
immediately fielded to locate the wreckage
and attempt to determine the cause of the
sinking. In addition to a variety of devices to
search the general area—such as towed cam-
eras and magnetic sensors—the searchers
also desired to place men on the scene. At
this time TRIESTE constituted the only U.S.
capability for reaching 8,400 feet.

TRIESTE’s performance in 1963 and a year
later was less than admirable: Too slow tow-
ing (2-3 knots); too slow submerged (0.9
knot); awkward to maneuver; surface pre-
and post-dive preparations could not be per-
formed when seas greater than 3 to 4 feet
high prevailed; in short, the bathyscaph was
simply not able to put the time on the bottom
required for searching (24). Even with an
interim overhaul, from which a newly desig-
nated TRIESTE II emerged with a new float
designed for faster towing (Fig. 3.13) and
greater propulsive power and a manipulator,
it wasn’t much better than an elevator, and
an unreliable one at that.

Two weeks after THRESHER met its
doom, the Secretary of the Navy set up a
Deep Submergence Systems Review Group
which conducted a year-long study on deep-
oceans operations, not only for THRESHER-
type search missions, but for recovery of
missile and space components as well. In
June 1964 the DSSRG released its report.
Four main categories were addressed: 1) Re-
covery (rescue of personnel); 2) man-in-the-

Fig. 3.12 The USS THRESHER which sank in 1962 and carried 129 men to their
deaths. (U.S. Navy)

sea; 3) investigation of the ocean bottom and
recovery of small objects, and 4) recovery of
large objects. The total amount recom-
mended for a 5-year program to meet the
group’s stated objectives was $333 million.
Specifically, the recommendations of interest
to submersible builders called for the follow-
ing:

Recovery of Personnel: Six rescue units with

two submersibles in each unit capable of

rescuing personnel from the collapse depth

of current submarines (at a later date a

depth of 5,000 ft was established).

Recovery of Small Objects and Ocean Floor Investi-

gation: Two search units of two small sub-

mersibles each with an ultimate depth ca-
pability of 20,000 feet.

Recovery of Large Objects: An unspecified num-

ber of small submersibles capable of sup-

porting recovery of intact submarines
down to collapse depth.

The recommendations were accepted in
June 1964 and a Deep Submergence System
Project was established to execute them. The
following November a meeting was held in
Washington, D.C., where the DSSP was de-
scribed and areas of technological concern
delineated. Eight hundred industry repre-
sentatives attended; 1,000 were unable to
attend owing to lack of space (25). The abso-
lute finality of sudden, violent death, the
lack of knowledge as to why and the possibil-
ity of nuclear contamination, of which no
evidence could be found (24), produced a re-
action never before witnessed in the wake of
a submarine tragedy.

With increasing attention focusing on the
deep sea, new submersibles joined the fledg-
ling 1964 community. The 100-ft NAUTI-
LETTE continued to pursue the recreational
field, but John Perry’s PC-3A1, a 300-ft, 2-
man submersible, went to the U.S. Army for
a new type mission: Recovery of missile com-
ponents in the down-range islands of the
South Pacific. Its sister-sub, PC-3A2, went
to the Air Force for similar tasks.

At the Naval Ordnance Test Station, China
Lake, California, the 2,000-ft, 2-man DEEP
JEEP was launched. DEEP JEEP, under
construction since 1961, was built primarily
to evaluate various design systems and oper-
ational techniques anticipated for a general-
purpose oceanographic and work submers-

Fig. 3.13 The evolution of TRIESTE 1958 (date approximate). (U.S. Navy)

e ‘

Fig. 3.13 TRIESTE—1964. (U.S. Navy)

46

Fig. 3.13 TRIESTE 1958 (U.S. Navy)

ible in underwater test ranges (26). Several
subsequent U.S. Navy submersibles (HI-
KINO, NEMO, MAKAKAI, DEEP VIEW)
were built for purposes similar to DEEP
JEEP, i.e., to test and evaluate systems and
materials rather than serve in an opera-
tional capacity.

In Woods Hole, ALVIN was launched and
began testing for a career that would be

47

exceeded by none for contributions to under-
sea technology and science. The 15,000-ft AL-
UMINAUT (Fig. 3.14) rolled off the ways at
Groton to play:

“*. . .a key role in man’s efforts to farm

the sea, mine it and harness its ener-
gies.”
—J. Louis Reynolds (27)

Two other submersibles appeared in 1964
for reasons different than any so far. ASH-
ERAH, a 2-man, 600-ft vehicle (Fig. 3.15), was
built by General Dynamics for the Univer-
sity of Pennsylvania Museum with grants
from the National Geographic Society and
the National Science Foundation. Named
after the Phoenician sea goddess, ASHERAH
would play a major part in mapping ancient
Mediterranean shipwreck sites under the di-
rection of archeologist George Bass. AU-
GUSTE PICCARD (Fig. 3.16), named after
the now deceased father of deep submer-
gence, was designed by Jacques Piccard and
constructed by Giovanola of Switzerland.
The 93-ft-long, 2,500-ft-depth submersible
was stationed on Lake Geneva (Leman) and
conducted daily dives wherein 40 passengers,
each with his own viewport, cruised the bot-
tom of the 1,000-ft-deep lake. AUGUSTE PIC-
CARD was financed by the Swiss National
Exposition as a tourist attraction; from 16
July 1964 to 17 October 1965 it conducted
1,112 dives and introduced over 32,000 pas-
sengers to the field of limnology.

That a market for submersibles did, in fact,
exist was demonstrated in 1964 and early
1965. Under an arrangement with Cous-
teau’s OFRS, Westinghouse Corporation’s
world-wide charter facility brought the DIV-
ING SAUCER to California where it carried

; |
ete aa
eee

Fig. 3.14

48

scientists and engineers from government
and academia on a total of 132 dives during
January—March 1964 and November 1964—
April 1965. Working primarily in the canyons
off Southern California, the DIVING SAU-
CER produced an impressive array of in situ
oceanographic data and photographic docu-
mentation. The uniqueness of deep diving
and its inherent drama received a great deal
of attention from the media and trade jour-
nals and served as a further catalyst draw-
ing attention to hydrospace. The DIVING
SAUCER operations were the first long-term,
open-ocean series of dives where industry
provided the submersible system as a facility
for diving scientists.

OCEANOGRAPHIC CLIMATE OF
THE MID-SIXTIES

Based on the accelerated development of
submersibles from 1965 to the present (1975),
one must conclude that somewhere between
1963 and 1966 the undersea climate brought
many companies to the decision to build. Let
us examine, from the decision-maker’s point
of view, the atmosphere which influenced his
thoughts in 1965.

TRIESTE’s record dive to the greatest
known ocean depth and the twenty or so
follow-on second generation submersibles
were obvious proof that no major break-

Reynold's ALUMINAUT underway to sea trials off Connecticut in 1964. (Gen. Dyn. Corp.)

Fig. 3.15 ASHERAH is christened to begin its life as an underwater archeologist for the Univ. of Pennsylvania. (Gen. Dyn. Corp.)

throughs in technology were required to
build a safe and satisfactory submersible.
The Navy’s interest in submersibles was
more than casual: It now owned three (TRI-
ESTE, ALVIN, DEEP JEEP) and was
launched into the multi-million dollar DSSP.
The DSSP was not the only likely candidate
for submersible services and sales. Proposals
were circulating amongst various govern-
ment activities outlining the need for at
least one and, in several cases, two submers-
ibles in Navy test ranges as workboats for
repair, salvage and other duties. In fact,
specifications were being prepared in 1965
for construction of two ALVIN-like submers-
ibles called AUTEC I and II for the Atlantic
Undersea Test and Evaluation Center, in the
Tongue of the Ocean, Bahamas. One of the
best recommendations one can forward in
replying to a government Request For Pro-
posals is a demonstrated capability. When
such RFP’s began appearing it would, so the
thinking went, be a strong selling point to

49

offer a submersible with a successful track
record as a demonstrated capability.

Would the funds be forthcoming? By 1965
the Federal government had already in-
vested $26 billion in a dramatic, daring and
exciting space program; why not the sea? It
was equally dramatic, mysterious and excit-

Fig. 3.16 Now a Canadian survey submersible, AUGUSTE PICCARD began its
career carrying 32,000 people to the bottom of Lake Geneva in 1964 and 1965
(Swiss Expo.)

ing. Besides, strong arguments could be ad-
vanced for pushing back the frontiers of hy-
drospace with its inherent food and mineral
resources. That the Federal government was
paying more than lip service to the ocean
could be seen in the funds allocated for sup-
port of oceanography. One conservative esti-
mate (28) shows Federal funds of $21.3 mil-
lion devoted to oceanography in the year
1958. In 1963 the annual amount was six
times that, or $123.6 million. These figures
reflect funding concerned only with describ-
ing and understanding the oceans. If funds
are included which reflect development of
fisheries, technology, coastal zone develop-
ment, mapping, charting, ocean engineering
and other ocean-related activities, these an-
nual figures are almost doubled. For exam-
ple, reference (29) shows $227.6 million in
1968; reference (30), which includes all ocean-
related activities, shows $431 million for the
same year. From 1958 to 1965 the funding
growth of oceanography was, no matter how
calculated, phenomenal.

The Federal government was not the only
prospective customer. Just off the shoreline
and expanding outward and deeper was the
oil industry. For years the diver had been a
full-time employee of the marine petroleum
community providing repairs, inspection and
installation of various devices and hardware
associated with exploration, development
and production of offshore oil. Submersibles
could go deeper, stay down longer, and the
passengers need do no more than look out
the viewport. Certainly a market could be
found in this multi-billion dollar industry.

Adding further enchantment was the tre-
mendous surge in recreational diving. With
interest running high, there must be a mar-
ket somewhere for small, inexpensive recrea-
tional submersibles; the tourist concept of
the AUGUSTE PICCARD was given more
than a passing glance. If 32,000 people were
willing to pay for a trip to the relatively
uninteresting bottom of Lake Geneva, it is
not unlikely that a continuing and even
larger number would pay for shallower, but
far more interesting cruises through the in-
credibly beautiful coral reefs of the Bahamas
or Florida.

When one inspected the existing submers-
ibles in 1965 they all were employed to a

50

greater or lesser degree. Those that were
not, were hurriedly going through testing
phases and acceptance trials. DIVING SAU-
CER just finished a lease on the West Coast;
ASHERAH was conducting biological surveys
in Hawaii; AUGUSTE PICCARD was making
an average of nine dives a day at the Swiss
Exposition; the government-owned vehicles
were either diving or testing; and the
smaller vehicles (PC-3B, SUBMARAY) were
being kept busy. Another new customer was
introduced in June 1965 when the U.S. Naval
Oceanographic Office chartered the PC-3B
for a series of cable route surveys off the
coast of Andros Island, Bahamas. This was
not the Oceanographic Office’s only involve-
ment in submersibles. In the same year it
received its first funds for a research and
development program aimed at evolving de-
sign specifications, instrumentation and op-
erational techniques for a 20,000-ft Deep
Ocean Survey Vehicle. In the process, its
announced intention was to lease existing
vehicles and use them in actual surveys to
get a feeling for the problems involved in
undersea surveying; over $1 million a year
for the next 5 years was scheduled for sub-
mersible leases.

If the potential submersible builder needed
further encouragement he could find it from
government officials, the press and his own
associates; for example:

“The President (Johnson) announced
today that the Department of the Navy
and the Atomic Energy Commission are
jointly developing a nuclear-powered
deep submergence research and engi-
neering vehicle.”

—White House Press Release
April 1965

“. . . the field (deep submergence) is a
new one and the future rewards for any
company which can successfully build a
vehicle capable of working safely, effec-
tively and for a proper length of time on
the bottom of the ocean will be great.”

—VADM I. J. Galatin
Chief of Naval Material
May 1965 (26)
“*| . . in response to the growing demand
for both government and industry the

nation’s naval architects are producing
a fleet of small, odd-looking submarines,
most of these aimed at great depths.”

—TIME
5 June 1965

““We’re about where the space industry
was ten years ago. My guess is that this
new industry will be larger than aero-
space.”

—G. T. Scharffenberger
Senior V. Pres., Litton Ind.
NEWSWEEK
27 September 1965

‘Despite the recent appearance of more
non-military submersibles the shortage
still exists.”

—R. Loughman,
General Dynamics Corp.
—G. Butenkoff,
Allis Chalmers Mfg. Co.
September 1965 (29)

There was yet another factor impossible to
assess: the magnetic attraction of man to the
deep ocean. The opportunity to be on the
very frontiers of abyssal exploration is pow-
erful tonic. The attraction of things beneath
the sea is apparent considering the televi-
sion and cinematic successes of Cousteau
and others. The foundations of this attrac-
tion lay in the unknown, the beauty, the
eternity, the serenity and the brutality of
life beneath the waves. To the layman, it is a
spectator’s world; to the average oceanogra-
pher and marine engineer of the pre-1960’s it
was a world of inference. Before Beebe, all
knowledge of the ocean below 100 or so feet
was derived from instruments hung over the
side of ships. From such discrete bits of data
did oceanographers infer the condition of the
deep. When scientists and engineers, who
spent years on rolling, pitching ships trying
to piece together what lay beneath their
decks, sense the opportunity to see this
realm with their very eyes, decisions can be
made which transcend profit-and-loss state-
ments. Whether large or small, corporations
are groups of individuals, and the attraction
of the deep ocean is no less to the engineers
or vice presidents of General Motors or

a1

North American Rockwell than it is to a
Piccard or a Perry. To an immeasurable, but
significant degree, this magnetic attraction
drew the decision-makers of the mid-sixties.

VEHICLES FOR ANY OCCASION
(1965-1970)

Succumbing to the prevailing atmosphere,
submersible builders in the last 5 years of
the 1960’s produced the greatest variety of
deep-sea participants and activities in his-
tory and, almost overnight, saw the sharpest
decline. From 19 operational vehicles in 1964,
the number grew to 60 by the end of 1970.
Federal support of oceanography, increasing
by leaps and bounds in the early sixties,
leveled off in the latter part of the decade,
and with it the submersibles of large indus-
try either went into storage or were sold.
The largest user of submersibles in the U.S.,
the Navy, acquired its own vehicles and dis-
continued leasing. Trends in vehicle design
developed which resulted in greater viewing
capability, diver support and transport,
greater manipulative capacity and a lessen-
ing emphasis on great depth capability.

Indeed, developments and shifting trends
in undersea technology occurred with such
rapidity in this period that it must be fol-
lowed on a year-to-year basis to comprehend.

1965

Under an agreement with Cousteau’s
OFRS, Westinghouse Corp. anticipated the
delivery of a 12,000-ft DEEPSTAR vehicle in
1964, but welding problems developed in the
Vasco Jet-90 steel hemispheres. The attend-
ant delay and possibility of Navy certifica-
tion problems was unacceptable to Westing-
house. Instead, they constructed a sphere of
HY-80 steel, used by the U.S. Navy in nu-
clear submarines, and, accepting a depth de-
crease of 8,000 feet, fitted it to the already
designed DEEPSTAR. The Vasco Jet hull
remained in France and would later (1970)
constitute the pressure sphere of SP-3000
(31). The new DEEPSTAR 4000 began its
test dives at San Diego in early 1966.

In Vancouver, British Columbia three com-
mercial divers completed the first of their

Fig. 3.17 PISCES |, Il and III (L to R). Workhorses of the Arctic and North Sea. (International Hydrodynamics)

PISCES-class vehicles. PISCES I (Fig. 3.17),
a 1,200-ft, 3-man submersible, was con-
structed by International Hydrodynamics
Ltd. (HYCO) “‘. . . to provide a quantum
jump in man’s ability to work undersea.”
Reasoning that a submersible offered
greater depth, duration and exploration
ranges, the partners of HYCO also saw the
opportunity to allow the non-diving special-
ist of any discipline to visit subsurface work-
sites under “‘shirt sleeve” conditions. A total
of seven submersibles and hundreds of dives
would come out of this small, vigorous Cana-
dian firm in the next 8 years.

1966

The role of manned submersibles in under-
sea search efforts was given a strong boost
in February 1966 when an American bomber

52

collided with its tanker during mid-air re-
fueling off the southern coast of Spain. Four
of the aircraft’s H-bombs fell harmlessly on
land and were recovered; one fell into the sea
and initiated another THRESHER-type oper-
ation to find and retrieve the errant, 1.1-
megaton bomb. The bottom of the ocean at
2,200 to 3,000 feet off Spain is characterized
by deep gullies running downslope at a steep
gradient; shoreward of 2,250 feet it is more
level and gentle. The precise location of the
bomb was unknown, and it could be any-
where from a few feet deep adjacent to the
coast, to several thousand feet some miles off
the coast. Virtually every applicable search/
identification device the Navy owned or in-
dustry could offer was brought into play:
Mine hunting sonar, side scan sonar, under-
water television, divers and manned sub-

Fig. 3.18 Explosive experts examine the parachute-fouled H-Bomb recovered from
2,850 feet off the Southern Coast of Spain in 1966. (U.S. Navy)

mersibles. The sonar devices worked well in
flat, nearshore areas, but they could only tell
that “‘something’’ was on the bottom, not
what it was. Ambient pressure divers did
most of the shallow identification along with
the Perry PC-3B. In the rugged, offshore
bottom the bomb was concealed from sonar
contact by ridges between the gullies. The
offshore search was left to ALVIN, ALUMI-
NAUT and DEEP JEEP. The latter ran into
operational difficulties and withdrew early
in the search. ALVIN located the parachute-
shrouded bomb at 2,250 feet and attached a
lift lme which parted during retrieval and
started the search anew. When the bomb was
relocated it was now at 2,850 feet, and a self-
propelled, TV-equipped, cable-powered de-
vice, CURV (Controlled Underwater Re-
search Vehicle), was employed to attach a lift
line for retrieval. In the process of hooking
up, CURV became entangled in the bomb’s
parachute and fortuitously both CURV and
the bomb were retrieved (Fig. 3.18) after
some 80 days of search/recovery efforts.

53

While the performance of all system partic-
ipants was less than perfect, the bomb was
found and recovered, an almost impossible
feat at the time of THRESHER 3 years ear-
lier. The bomb hunt highlighted the problem
of undersea navigation, reliability of sub-
mersibles and the still primitive stage of our
ability to recover objects from the deep sea
(32). The bomb hunt, with its attendant pub-
licity, provided more encouragement to the
submersible builders. ALUMINAUT’s $304,-
000 bill for its participation did not go unno-
ticed either.

In June 1966 Westinghouse Corporation’s
DEEPSTAR 4000 (Fig. 3.19) began a diving
program for NEL that continued into the
spring of 1968 and covered not only the east
and west coasts of the U.S., but Central
America as well. Including a Westinghouse-
financed series of 11 dives in project
GULFVIEW in the Gulf of Mexico (33),
DEEPSTAR 4000 conducted some 500 dives
from June 1966 through June 1968. It is
significant that this contract would be the
longest Navy lease given to any privately-
owned submersible to the date of this publi-
cation; the total contract amounted to $2,-
142,155 (34).

Another aspect of submersible diving
which entered the 1966 scene was that of

Fig. 3.19 Originally slated for 12,000 feet, DEEPSTAR 4000 represented the first

Westinghouse candidate for deep diving. In its 4-year career the versatile craft would

conduct over 500 dives and add significantly to our knowledge of the deep sea
(NAVOCEANO)

Fig. 3.20 General Dynamic's 1966 entries into Deep Submergence: STAR II and III. (Gen. Dyn. Corp.)

certification. Prior to 1966 Naval military
and civilian employees could officially dive in
privately-owned vehicles with no more than
the permission of their superiors. In 1966 the
Navy instituted procedures for certifying
submersibles to assure that they were mate-
rially safe to dive. Instructions were later
issued to certify the operators and the na-
ture of the mission as well. DEEPSTAR 4000
was the first commercial vehicle to become
Navy-certified. To July 1969 all other com-
mercial submersibles were granted certifica-
tion waivers. Other government non-Naval
activities, academia and industry had no
such requirements until some adopted the
American Bureau of Shipping’s standards in
1968.

ABS does not certify, instead it classifies
submersibles to conduct a specific task, such
as transportation or research. The Navy’s
certification, on the other hand, is for certain
depths and stated time periods and is only
concerned with safety of the passengers.
ABS classification is completely voluntary
and need not be undergone if the lessee does
not make it a requirement. Indeed, the only
Federal regulations governing submersible
operations then and now are the Coast
Guard’s regulations applying to small craft.
Certification and regulations are dealt with
in more detail in a later chapter. It is suffi-
cient to note here that many small-submers-

54

ible operators feared that the Navy’s certifi-
cation procedures, which require a great deal
of expensive testing and documentation,
would be adopted by the government gener-
ally. Of nine bills introduced to Congress
regarding submersible safety since 1968,
none have become law.

Further entries to the 1966 submersible
fleet came from General Dynamics Corpora-
tion in the form of the 1,200-ft STAR II and
the 2,000-ft STAR IIT (Fig. 3.20).

‘1967

“Unless more small submersibles are
built in the near future, the demand for
these craft may exceed the supply.”

—National Council on Marine
Research & Engineering
February 1967 Development Report

To fill this demand, Lockheed Missiles and
Space Division launched its sophisticated,
8,000-ft, 4-man DEEP QUEST. Lockheed was
the first submersible builder to construct a
support ship/launch-retrieval system specifi-
cally designed for its submersible, and DEEP
QUEST included virtually every type of con-
trol and maneuvering capability one could
envision for submersible missions. In addi-
tion to research, engineering or survey
tasks, the 40-ft-long vehicle could be fitted
with a transfer skirt on the bottom of its aft

Fig. 3.21 Although its early career was short-lived, PAULO / began diving in earnest
in 1973 as the renovated SEA OTTER. (Anautics Inc.)

pressure sphere to effect rescue of trapped
submariners; in essence, it was the first in-
dustry DSRV and clearly demonstrated
Lockheed’s expertise in deep submergence.
Down the coastline from Lockheed’s Sun-
nyvale plant, another submersible, PAULO I,
was launched (Fig. 3.21). Built by Anautics
Inc. of San Diego, the 600-ft, 2-man submers-
ible was designed for inspection, survey and
recovery on the continental shelf.
Beginning in 1967, Captain G. W. Kit-
tredge, USN (Ret.), constructed the first of
several 1-man, 250-ft submersibles known as
the VAST or K-250 series (15). The submers-
ible was advertised for application to a wide
variety of tasks, and an acrylic plastic dome
on the conning tower and a 16-inch-diameter
forward viewport provided versatility of
viewing from the 10.5-ft-long submersible.
Acrylic plastic was tested for the first time
as a candidate for pressure hulls. Built in the
latter part of 1966, plastic-hulled HIKINO
(Fig. 3.22) underwent tests by the Naval
Weapons Center at Shaver Lake, California
in early 1967. Several new concepts were
embodied in HIKINO: An acrylic plastic
pressure sphere to provide panoramic view-
ing; cycloidal propellers for maximum ma-
neuverability with a minimum amount of
propulsion units; and a catamaran-type
chassis or exostructure for maximum surface
seaworthiness and unhindered visibility (35).
HIKINO was purely a test vehicle, but it was
a harbinger of things to come. One para-
mount criticism of submersibles was the re-

55

striction on viewing. No matter how many
viewports a vehicle may have, from the
standpoint of safety and operational effec-
tiveness, more seemed desirable. The concept
of an acrylic plastic pressure sphere had
been advanced as early as 1963 (36), but this
was the first instance of its application. The
wider range of viewing through transparent
hulls and large diameter bow domes, pi-
oneered by HIKINO, would see increased
application in shallow submersibles of the
70’s.

1968

If there was, in fact, a shortage of sub-
mersibles in 1967, it vanished in 1968 with
the advent of 12 new vehicles.

NEKTON ALPHA, a 1,000-ft, 2-man sub-
mersible built by General Oceanographics of
Newport Beach, California, originally began
its career as an in-house capability of this
company to conduct contract jobs of its own.
Another 1,000-ft, 2-man vehicle SEA-RAY
(SRD-101) was built in this year by Subma-
rine Research and Development Corp., in
Lynnwood, Washington for inspection and
salvage tasks at $1,200 per day.

International Hydrodynamics Ltd., enjoy-
ing an extended torpedo-retrieval contract
for the U.S. Navy in a test range off Na-
naimo, British Columbia, extended its depth
capability with the 2,600-ft PISCES II.

Perry Submarine Builders produced three
submersibles; the first, the 3-man, 1,200-ft
PC5 went to Pacific Submersibles, Inc., of
Honolulu; the second two were unique. The

Fig. 3.22 The plastic-hulled H/K/INO set an early precedent for submersibles of the
seventies. (U.S. Navy)

1,350-ft DEEP DIVER (Fig. 3.23) and the 800-
ft SHELF DIVER were a new breed called
“lock-out” submersibles. In both vehicles the
after portion of the pressure hull was a
sphere in which the pressure could be
brought to ambient and a hatch in the bot-
tom opened to allow egress of divers. While
not a new concept, it was the first such
design of this period and was addressed pri-
marily toward support of divers in the petro-
leum industry. Demonstrating the versatil-
ity of this concept to support not only divers,
but also to effect “dry” transfer of materials
and non-divers to an atmospheric-pressure
undersea habitat, SHELF DIVER locked
onto Perry’s HYDROLAB at the 50-ft depth
in 1968 and transferred crewmen into the
habitat without them getting wet.

On the west coast of the United States,
North American Rockwell Corp. introduced
their BEAVER MK IV, another “lock-out”
submersible of 2,000-ft-depth capacity. BEA-
VER’s sophisticated instruments and sub-
systems provided a wide array of capabilities
in all aspects of undersea tasks. Particularly
innovative were its two mechanical arms and
accessories which advanced the state-of-the-
art in manipulative capability by a wide mar-
gin.

Also on the west coast, General Motors
Corporation’s Defense Research Laborato-
ries at Goleta, California, launched the 6,500-
ft, 3-man DOWB (Deep Ocean Work Boat).
Instead of viewports, DOWB (Fig. 3.24) relied
upon optical systems for viewing; two 180-
degree-coverage optical domes were in-

Fig. 3.23 The Perry-Link DEEP DIVER was the first modern submersible to incorporate a diver lock-out feature. (Ocean Systems Inc.)

stalled; one looked forward and one down-
ward. Separate images for two observers
were provided inside through a central opti-
cal assembly.

In December, the U.S. Navy added to its
Fleet the 6,500-ft, 3-man sister submersibles
SEA CLIFF and TURTLE (originally AUTEC
I & II) built by General Dynamics (Fig. 3.25);
TURTLE was slated for assignment to the
Navy’s AUTEC in the Bahamas, and SEA
CLIFF was to be assigned to Woods Hole
Oceanographic Institution (37), though
WHOI later declined the offer.

Under contract to the Grumman Corpora-
tion of Bethpage, New York, Jacques Piccard
designed and Giovanola Brothers built the
48-ft-long, 2,000-ft PX-15 in Monthey, Switz-
erland (Fig. 3.26). Capable of 4- to 6-week
duration dives, PX-15 (later christened BEN
FRANKLIN) was foreseen by Grumman to fill
a needed gap for extended missions which
submersibles at that date could not perform
Fig. 3.24 Now astudent training aid, DOWB was the only submersible to relinquish (38). For its first mission BEN FRANKLIN

viewports in favor of fiber-optics. (Gen. Motors Inc.) would perform a 30-day drift in the Gulf
Stream relying on the current for propulsion

erty : } i |

Fig. 3.25 Earmarked for work boats in the U.S. Navy's Bahamian Test Range, AUTEC | and // were redesignated SEA CLIFF and TURTLE and ultimately came under Submarine
Development Group-One in San Diego. (U.S. Navy)

a7

and a liquid oxygen-passive carbon dioxide
removal system for life support. BEN
FRANKLIN was transported to West Palm
Beach, Florida in 1968 for sea trials prepara-
tory to the Gulf Stream Drift Mission.

In the midst of the increasing undersea
tempo prospects for the future were taking a
disquieting turn. At an April 1968 Annual
Conference of the American Society of
Oceanography in Los Angeles, California,
Mr. Thomas Horton, former Marketing Di-
rector of Westinghouse’s DEEPSTAR 4000,
presented some chilling news to potential
submersible lessors (39). Alluding to the de-
pendence of the Navy submersibles now op-
erating on Navy Research and Development
programs, Horton foresaw a dire future in
light of the R&D funding cutbacks of the
past few years. He pointed out that indus-

va ee
ROPICAL - i

try’s investment in submersibles was far out
of proportion to the market, and what mar-
ket was left would experience energetic com-
petition, with the weaker companies falling
by the wayside.

Furthermore, Horton revealed, it was
doubtful if any leasing programs to date
were profitable. He stated that Westing-
house’s 6-month lease of the DIVING SAU-
CER was not profitable, and surmised that
International Hydrodynamics, Perry, and
Electric Boat, among others, had the same
experience: Profit on sales and loss on leas-
ing operations. Horton projected that this
may be due to a lack of capabilities and
pointed out “. . . sophisticated as they (sub-
mersibles) may seem, their ability to do eco-
nomically justifiable tasks in the sea is very
unsophisticated.”

Fig. 3.26 On 14 July 1969 BEN FRANKLIN began a 30-day drift off West Palm Beach, Fla. that carried its crew of six 1,500 miles before they left the 49-ft-long submersible.
(NAVOCEANO)

58

With some experience behind them, sub-
mersible owners were now in a better posi-
tion to assess their potential profits; the
outlook was not encouraging. To maintain a
submersible and its support ship on standby
is expensive. A small vehicle such as SEA
OTTER requires some $80,000 to $100,000 of
business annually to make a reasonable
profit (40). A mid-depth submersible of the
ALVIN-class requires between $700,000 to
$800,000, and ALVIN operates for a non-
profit institution. It was becoming clear:
Submersibles were expensive, and the long-
term contracts required to operate in the
black were less and less a prospect.

In August 1968 a near-tragic event oc-
curred a few hundred miles off Cape Cod. In
the process of launching, a lift cable on AL-
VIN’s cradle snapped, and the submersible
fell into the sea. Miraculously, the crew
scrambled out before the vehicle sank in
5,500 feet of water (Fig. 3.27). The following
summer, ALUMINAUT was able to put a lift
hook into ALVIN’s open hatch and USNS
MIZAR pulled it back to the surface; ALVIN
was diving again in the summer of 1970.

“TI will be honest with you. This Adminis-
tration cannot rush full speed ahead into
marine development programs. The real-
ities of national priorities and continu-
ing inflation demand Executive disci-
pline. All Federal expenditures have
undergone sharp review. In many cases,
we were forced to make painful reduc-
tions.”

—Address by Vice President Spiro Ag-
new
Fifth Annual Conference of the
Marine Technology Society
16 June 1969, Miami Beach, Fla.

What was suspect earlier was now reality:
There would be no “wet”? NASA, and if sub-
mersibles were going to ‘make it,” they
would do so because there was a unique and
necessary role they could perform. As far as
national priorities were concerned, Viet
Nam, domestic issues and established pro-
grams, such as outer space, took precedence
over an expanding deep-ocean exploration
program. While there was no cut in Federal
ocean funds, the level of funding increased at

59

a rate to take care of inflation. Research anc
Development funds for Navy submersibl
leasing were increasingly more difficult t:
attain and justify in the face of other, mor¢
pressing, military requirements. Still, th:
impetus of the mid-sixties continued to pro
duce additional submersibles.

A second Westinghouse vehicle DEEP.
STAR 2000 and its support catamarai
SEARCHSTAR (initially called MIDWIFE
became available as a submersible system
Although small (45-ft LOA), SEARCHSTAR
was a unique part of the 3-man, 2,000-ft
submersible system, its design was hydro
dynamically matched to the surface motio1
and mobility attributes of DEEPSTAR 2000
(41), and it could be dismantled for rail or air
transport. Originally assigned to Westing-

Fig. 3.27 ALVIN at 5,025 feet as photographed from the U.S. Navy Research
Laboratory's towed fish. (U.S. Navy)

house’s San Diego facility as a part of its
research inventory, the system was moved to
Annapolis in 1971 and made available for
leasing.

Another addition to the growing California
Fleet was SNOOPER, a 2-man, 1,000-ft sub-
mersible built by Sea Graphics Inc. of Tor-
rance for underwater photography. Farther
north, International Hydrodynamics Ltd.
added the 3,600-ft PISCES III to its inven-
tory and put it to work on its U.S. Navy
torpedo retrieval contract.

Across the Pacific, the first of the follow-on
vehicles stemming out of HIKINO appeared,
the 2-man, 300-ft KUMUKAHT. Built and op-
erated at the Makapuu Oceanic Center by
the Oceanic Institute at Waimanalo, Hawaii,
KUMUKAHI (meaning “first of a series” in
Hawaiian) had a 1'/s-inch-thick, 53-inch-di-
ameter pressure hull made in four parts of
plexiglass.

KUMUKAHI was to serve as a test vehicle
for the far more ambitious DEEP VOYAGER
Program. Though only a design, the sub-
mersible DEEP VOYAGER would conduct a
transit from Hawaii to the U.S. by nothing
more than taking on ballast and descending
at a controlled glide and then attaining posi-
tive buoyancy at 20,000 feet by generating
hydrazine gas and ascending at another
specified glide ratio. A total of 48 ascents/
descents was calculated to take the 3-man
vehicle 2,400 miles across the Pacific in 16
days. The DEEP VOYAGER Project, esti-
mated at $2.25 million, never saw fruition
and, after a few dives, KUMUKAH I itself was
retired and put on display at Sea Life Park
in Waimanalo.

The year 1969 also saw the advent of the
Jules Verne-like NR-1. Though the majority
of its construction and operational details
are classified, the U.S. Navy’s NR-I broke
away from the constrictions of lead-acid bat-
teries and incorporated a nuclear reactor
into its 130-ft long hull. With a life support of
45 days and virtually unlimited power, the
General Dynamics-built NR-1 seems capable
of research and surveying on a scale unap-
proachable by its contemporaries, and at an
estimated cost of $100 million (15) it is un-
likely to be rivaled for some time to come.

Minute by comparison were the two 1l-man,
1,600-ft SP-500’s (PUCE DE MER or Sea

60

Fleas) launched by Cousteau’s Office Fran-
cais de Recherches Sous-Marine (later be-
coming Centre D’Etudes Marine Avancees-
CEMA) in Marseilles. Primarily for underwa-
ter photography, the 10-ft long SP-500’s
would be used to film much of the later
television footage in which the Cousteau
group so excels.

Other “firsts” were appearing in the sub-
mersible field. The Piccard-designed BEN
FRANKLIN inauspiciously submerged in the
Gulf Stream off Palm Beach, Florida on 14
July and surfaced 30 days later south of the
Grand Banks. Only once during the 1,500-
mile drift did the vehicle experience diffi-
culty, and that occurred in the second week
when an eddy carried it out of the Stream
and required its support ship PRIVATEER to
tow it back to the central core. For 30 days
BEN FRANKLIN’s hatches remained sealed
and the unique, life support system sup-
ported the 6-man crew. An account of this
trip is in Piccard’s The Sun Beneath the Sea
(42), and the flawless performance of BEN
FRANKLIN is a tribute to his thoroughness
and infinite capacity for paying attention to
the minute details which can accumulate to
ungovernable proportions if left unattended.

As BEN FRANKLIN silently drifted below
the ocean’s surface, the U.S. Space Program
reached its culmination with the first moon
landing. While the two events may appear
unrelated, a NASA engineer aboard BEN
FRANKLIN collected data on “man in isola-
tion” which would be applied to the Skylab
Project, an “orbital drift” of the seventies.

Throughout the U.S. submersible activity
in private industry began to experience the
worst of Mr. Horton’s earlier forecast. An
article in BUSINESS WEEK, “Research Subs
on the Beach” (27 Dee 1969), saw an even
gloomier 1970 season, and listed several sub-
mersibles (STAR II and III, DEEPSTAR
4000, DOWB, BEAVER, DEEP QUEST) as
either laid up or idle. From the vantage point
of large American industry, it was becoming
painfully clear: The high water mark in long-
term profitable submersible lease programs
had been reached; the Federal government
was not the only group making painful deci-
sions.

1970

In spite of such omens, U.S. submersibles
continued to appear, but, responding to the
inordinate cost of the deep-diving large vehi-
cles, shallower and less expensive vehicles
entered the scene.

NEKTON BETA and GAMMA joined Gen-
eral Oceanographics’ NEKTON ALPHA and
leased out at the low cost of $1,000/day, a
rate far more accessible to money-short sci-
entists than the $6,000 to $14,000/day cost of
the larger, deep-diving vehicles. Later in the
year, on 21 September, NEKTON BETA expe-
rienced a bizarre accident that took the life
of passenger Larry A. Headlee and marked
the first death in the field of deep submer-
gence (see Chapter 15).

Sun Shipbuilding and Dry Dock Co. of
Chester, Pennsylvania launched its candi-

Fig. 3.28 The U.S. Navy's NEMO. Now retired from Navy services, NEMO served to
investigate the feasibility of acrylic plastic for deep submergence. (U.S. Navy)

61

date for low-cost, long-endurance missions,
the tethered GUPPY. The 1,000-ft, 2-man
GUPPY relied on a cable from the surface for
power. The $95,000 vehicle resembled the
earlier BATHYSPHERE only in appearance
and surface reliance on electrical power; oth-
erwise it had the operating capabilities of an
untethered vehicle.

Furthering the concept of acrylic plastic
pressure hulls, the U.S. Naval Civil Engi-
neering Laboratory (NCEL) at Port Hue-
neme, California, constructed NEMO (Fig.
3.28), a 600-ft, 2-man vehicle with a pressure
hull of twelve, 2.5-inch-thick, spherical plas-
tic pentagons bonded together with adhe-
sive. Capable of limited lateral maneuvering,
NEMO was basically an underwater yo-yo.
Attached to a wire cable beneath the vehicle
was a 380-pound anchor on a pilot-controlled
hydraulic winch. Anchoring itself to the bot-
tom and attaining positive buoyancy, NEMO
could ascend to a selected depth and hover
“at anchor.” While the panoramic and hover-
ing stability offered advantages to the un-
derwater worker, NEMO was another Navy-
built vehicle to assess the feasibility of var-
ious components and materials—in this case
acrylic plastic as a candidate for fleet subma-
rines and other military devices.

Perry Submarine Builders delivered the
first submersible to a petroleum-oriented
customer. The 1,3850-ft, 4-man SURVEY
SUB 1 (PC-9) was built for Brown and Root
Corp., in Houston, Texas, for use in the oil
fields as a surveying platform and for inspec-
tion of pipelines and other production/trans-
portation hardware.

With the originally-intended DEEPSTAR
12000 hull, CEMA completed the SP-3000
for Centre National pour Exploitation des
Oceans (CNEXO) at Marseilles. The French
SP-3000 (recently designated CYANA) was
to fill in the 0-10,000-ft depth range not
amenable to the bathyscaph.

CEMA was also active at this period in
construction of the Cousteau-proposed AR-
GYRONETE for France’s CNEXO and IFP
(Institut Francais du Petrole). ARGYRO-
NETE would be a 1,970-ft, submersible com-
posed of a large cylindrical pressure hull
where passengers would live at atmospheric
pressure and a smaller pressure hull where
divers would live or lock-out at ambient pres-

sure (Fig. 3.29). Diesel-electric motors would
provide it with surface propulsion and auton-
my of operations. Lead-acid batteries would
ipply submerged power, and in combination
vith its life support system, a submerged

ive of 8 days would be possible for the 10-
nan crew. However, when the pressure hulls
vere constructed and joined, further work on

RGYRONETE was halted to reconsider the
»roject from a financial viewpoint and to
study future uses of the vehicle (43). No
further work has been reported since Octo-
ber 1971.

In 1970, Westinghouse Corp. also halted
construction on the DEEPSTAR 20000. Pos-
sibly anticipating a Federal customer, design
work on the 20,000-ft vehicle began in the
optimistic atmosphere of 1966, but by 1970
Westinghouse, like others, could read the tea
leaves and no customer for the $5 to $10
million submersible was foreseen. With the
pressure hull and many other components
completed, the never-assembled DEEPSTAR
20000 went into storage.

With little need for a second BEAVER,
North American Rockwell sold a spare set of
BEAVER pressure hulls to International Hy-

drodynamics who configured the hulls into
the lock-out vehicle SDL-1 for Canadian
Forces. Externally similar to the PISCES-
class submersible, the 2,000-ft, 6-man SDL-1
is capable of lock-out to 1,000 feet and would
augment Canadian Forces’ capability for mil-
itary and scientific tasks.

Like their Canadian counterpart, the U.S.
Navy also took delivery on a submersible in
1970, the first Deep Submergence Rescue
Vehicle (DSRV-1). Capable of rescuing 24
men at a time from 3,500 feet (to be uprated
to 5,000 ft), DSRV-1 (Fig. 3.30) was, and
remains, the most complex, sophisticated un-
dersea vehicle today, but the price tag was
far beyond 1964 expectations. Originally esti-
mated at $3 million apiece, based on ALVIN’s
cost, DSRV-1 cost an estimated $43 million
(44). The original DSSRG recommendation
for 12 such vehicles for a total of $55 million
was, to say the least, embarrassingly shy of
the mark. Indeed, embarassment was a com-
mon attribute among the earlier prognosti-
cators of the nation’s future in the sea. By
the end of 1970, the deep submersible leas-
ing/building curve was plummeting down-
ward in the U.S. and the largest customer,

oe pp

4
}

is “) “"@ (On oie i

Fig. 3.29 The pressure hulls of ARGYRONETE. Offering, in concept, capabilities for underwater work far beyond that of present submersibles, ARGYRONETE has yet to proceed
from this point of construction shown in 1971. (Thomas Horton)

the Navy, now had a broad-spectrum sub-
mersible capability of its own.

The DSSP was finding considerable diffi-
culty in funding not 12, but merely 2 DSRV’s.
A second 5,000-ft DSRV-2 would be launched
in 1971, but no further vehicles were
planned. The fleet of submersibles for assist-
ance in large and small object recovery was
reduced to one Deep Submergence Search
Vehicle (DSSV), and this never progressed
beyond a preliminary design contract con-
ducted by Lockheed. At an estimated $60 to
$100 million apiece (15), the DSSV is not a
likely candidate for construction. With 8
years separating THRESHER and the DSSP,
the sense of urgency and the emotions of
1963 were absent from R&D funding circles.
So much so, in fact, that the 1968 sinking of

Fig. 3.30 The first of two U.S. Navy rescue submersibles (DSRV-1) is launched in
1970 at San Diego, Calif. (U.S. Navy)

63

another U.S. Navy submarine, SCORPION,
in 10,000 feet of water passed with barely
more than a ripple of concern relative to
THRESHER. In the hard light of 1970 the
need for even one DSRV was under close
scrutiny. Submarine accidents, where the
crew could be rescued, occurred at depths
where the McCann Diving Bell or escape
devices were more operationally practical
than a DSRV. In cases such as THRESHER
and SCORPION crush depth was exceeded,
and any hope of rescue vanished. And fur-
thermore, the practicality of a DSSV was
questionable when unmanned devices—suc-
cessors of CURV—had reached a level of
competence where the advantages of man on
the scene were outweighed by long-duration,
less costly, unmanned remote search sys-
tems.

As Vice President Agnew projected, pain-
ful cuts were being made, and deep-ocean
technology was feeling the surgeon’s scalpel.

To exemplify the shortage of funds for
deep submersible exploration, the Navy con-
tracted its last- and only-charter of DEEP
QUEST in April-May 1970 with the Naval
Oceanographic Office. This organization also
terminated its leasing of submersibles and
foreclosed on the prospects for a Deep Ocean
Survey Vehicle. Similarly, NEL and the Un-
derwater Sound Laboratory terminated leas-
ing for lack of funds.

The cost of maintaining a submersible
made itself felt on the projected plans for
work submersibles in Navy ranges. Origi-
nally slated for the AUTEC range, SEA
CLIFF and TURTLE were beyond the operat-
ing budget of AUTEC and were transferred
instead to the Navy’s Submarine Develop-
ment Group One (SUBDEVGRU-1), who also
had TRIESTE II and DSRV-I under their
aegis. With the acquisition of these vehicles,
there was little further need of industry
vehicles to perform Navy tasks.

Though the fact was yet to be recognized
by all industry, it was not long coming: Leas-
ing deep submersibles in the early 70’s of-
fered no potential for profit. During 1970-71
the fleet of privately-owned U.S. submers-
ibles diminished: DEEPSTAR 4000 was al-
ready in mothballs when joined by DEEP-
STAR 20000; ALUMINAUT retired in 1971;
STAR I went on display in the Philadelphia

Maritime Museum; DOWB was given to
Santa Barbara City College as a training aid
for engineering students; BEN FRANKLIN
was sold to Horton Maritime Explorations
Ltd. in Vancouver, B.C.; BEAVER, after ex-
periencing fire at 1,545 feet, was repaired
and sold to International Underwater Con-
tractors of New York. The promising aspect
of the sixties was only that, as a “. . . new
industry larger than aerospace” deep sub-
mergence would have to mark time. But asa
capability which improved with age, the
manned submersible capabilities of the
1970’s profited by the experience of their
predecessors.

A MORE CONSERVATIVE
APPROACH—THE 1970’s

Submersible builders of the seventies, rec-
ognizing that great depth equaled great cost,
pursued a more modest and inexpensive ap-
proach. Twenty submersibles were built from
1971 through 1973: Sixteen of these were less
than 2,000-ft depth, 13 of which were 1,200-ft
or less. The deep submersibles were the 6,-
500-ft PISCES IV and V and the 5,000-ft
DSRV-2.

In another vein, the majority of submers-
ibles—13—were built outside of the U.S. or
for non-U.S. customers. Twelve were built
under contract for a buyer or were assured
of operational funding by a government or
research foundation. Those built on lease
speculation offered a particular capability to
an identified customer: The offshore oil
patch. A trend toward large-diameter view-
ing domes, or acrylic plastic hulls, was evi-
dent, as was lock-out capability. Absent were
dashing crew uniforms and talk of large
scale undersea exploration. The field of deep
submergence was maturing. If the manned
submersible was to survive, it would do so
because it could compete with the diver, sur-
face ship or other engineering, surveying
and research devices.

Increased viewing capability utilizing
large, acrylic plastic bow domes was seen in
Perry Submarine Builders’ 600-ft PC-8, the
1,025-ft TUDLIK (PS-2) and the 1,200-ft
VOL-LI (PC-15). TUDLIK was constructed
by a Canadian branch of Perry for leasing in
that country, while VOL-L1, a lock-out sub-
mersible, was constructed on order for Vick-

64

ers Oceanics Ltd. in England. Departing
from the standard PISCES configuration, In-
ternational Hydrodynamics constructed the
1,200-ft AQUARIUS I (Fig. 3.31) with a 36-
inch-diameter bow dome and Perry-like, bat-
tery-carrying skids.

A few blocks away from the energetic In-
ternational Hydrodynamics group another
submersible reappeared which once resided
in California. PAULO IT was sold in 1971 to
Candive Ltd. of Vancouver and its pressure
hull was contracted for long-term lease by
Arctic Marine Ltd., also Vancouver-based.
This new firm retained the general PAULO I
outline, but configured and uprated the vehi-
cle’s depth into the 1,500-ft SEA OTTER (Fig.
3.32). Adding a new propulsion system, lights
and cameras, and acquiring one of BEA-
VER’s versatile mechanical arms, Arctic Ma-
rine greatly improved the capacity of the
original vehicle to perform a wider range of
surveying and engineering tasks.

Mr. Edwin Link, an innovative and emi-
nently successful pioneer in the American
aircraft industry, turned his many talents
toward the sea in the early sixties designing
DEEP DIVER and a variety of ambient div-
ing habitats and devices. In 1971 Mr. Link

Fig. 3.31 AQUARIUS | typifies the new breed of submersibles: shallow depth,
simple construction and operation and panoramic viewing. (HYCO)

saw the launching of another of his designs:
The 1,000-ft, diver lock-out JOHNSON SEA
LINK. Donated by Link to the Smithsonian
Institution and operated by the Marine Sci-
ences Center at Ft. Pierce, Florida, SEA
LINK incorporated a forward pressure
sphere of plastic and an aft diver lock-out
sphere of aluminum. Philanthropist Seward
Johnson’s sincere and abiding interest in the
marine environment was, and remains, a
chief factor in SEA LINK’s birth and contin-
ued operation.

In addition to securing its 5,000-ft DSRV-2,
the U.S. Navy continued efforts toward ma-
terial and component testing. In 1971 the
1,500-ft DEEP VIEW and 600-ft MAKAKAI
were launched and placed, along with NEMO,
under operational control of the Navy Un-
dersea Center at San Diego. An early pioneer
in submersible design and innovation (DEEP
JEEP, KUMUKAHI, DEEP VOYAGER), na-
val engineer Willis Foreman designed the
glass hemi-head DEEP VIEW to assess the
problems encountered with joining glass and
steel under high pressure-low temperature
conditions. Borosilicate glass constitutes
DEEP VIEW’s forward hemi-head and HY-
100 steel its cylinder and after endcap. The

Dea

W/D ratio of glass is one of the lowest of all
materials and its strength actually increases
under pressure; hence, if some of its fabrica-
tion and jointing problems can be overcome,
glass offers tremendous potential to under-
sea pressure capsules.

The acrylic plastic-hulled MAKAKAT was
fabricated to assess various means (includ-
ing use of fiber optics and photometers) of
telemetering data through a plastic sphere
in lieu of thru-hull penetrations and to eval-
uate and gain experience with cycloidal pro-
pulsion systems instead of conventional pro-
peller-rudder type maneuvering.

The seventies saw the entrance of other
European countries into the submersible
field. Anticipating business from the newly-
discovered and mushrooming North Sea oil
fields, the Dutch company Nereid nv. of
Schiedam constructed the 3380-ft, 3-man
NEREID 330. In addition to a wide range of
viewing, NEREID 330 is fitted with a 15-ft-
long, 2,500-pound lift-capacity, mechanical
arm with a gripping force of 6 tons. A second
vehicle, NEREID 700, a 4-man, 700-ft sub-
mersible with diver lock-out capability, was
delivered to Dutch Submarine Services of
Amsterdam in the summer of 1973.

SRR ORRE

Fig. 3.32 Althought non-political by design, the Canadian submersible SEA OTTER is called to come to the aid of a party. (Arctic Marine Ltd.)

65

The West German firm Bruker-Physik A.G.
launched the 984-ft, 2-man MERMAID I in
1972 to fulfill a wide variety of tasks. The
Karlsruhe-based firm is constructing a sec-
ond craft, MERMAID III, to be launched in
1975; similar to its sister-vehicle, the later
version includes diver lock-out and transfer
capabilities.

A second West German firm, Maschinen-
bau Gabler GmbH of Lubeck, produced the
984-ft, 2-man TOURS 64 and TOURS 66 in
1971 and 1972, respectively. Differing in di-
mensions, the 66-boat being slightly larger,
both have surface diesel-electric propulsion
and a cruising range of 400 nautical miles.
Both submersibles were built specifically for
the unique role of “coral cracking” or gather-
ing gem-quality red and pink deep-sea corals.
The harvesting of this valuable coral—which
lives beyond routine, compressed-air, am-
bient diving depths—was an early prognosti-

cation of the role submersibles might play.
TOURS 64 was delivered to the Taiwan-
based firm of Kuofeng Ocean Development
Corp. in Taipei; TOURS 66 went to the Ital-
ian firm of SELMAR at Cagliari, Sardinia.
Adding to its country’s small, but viable,
submersible fleet, the Japanese firm of Ka-
wasaki Heavy Industries built the 984-ft, 4-
man HAKUYO, for continental shelf work by
Ocean Systems Japan, Ltd. Launched in
1971, the versatile HAKUYO would be a pri-
vate-industry vehicle for engineering and
surveying work by other offshore interests.
At this writing the Perry company and
International Hydrodynamics are each in
the design and construction stage of several
more submersibles. There is talk of a 20,000-
ft Japanese submersible, but actual con-
struction has not been reported.
Several—perhaps 10 or 20—small, shallow-
diving submersibles were built during the

Fig. 3.33 A variety of one- and two-man shallow diving submersibles. (Douglas Privitt, Gen. Oceanographics)

66

r
2

1G 4680

67

o

years covered above (Fig. 3.33), but their
details are not available. From what can be
gleaned, they incorporate the same general
design and operational features as the NEK-
TON, PC-3A, NAUTILETTE and SPORTS-
MAN-class submersibles. The reasons for
their construction can probably be found in
individual motivation, and detailing their de-
sign would likely reveal nothing more than
what can be attained from those listed in
Chapter 4.

Large American industry has all but
stopped construction of submersibles; even
to lease those built and now inactive would
require guarantees of long-term leases which
no present user can provide. Government
leasing of submersibles in the U.S. has not
completely stopped, but the scale is modest,
and the user is purely scientific. In 1972 the
National Oceanic and Atmospheric Agency’s
MUST (Manned Undersea Science and Tech-
nology) Program commenced leasing of sub-
mersibles for programs dealing with environ-
mental research and monitoring and fisher-

69

ies research. Several hundred dives have
been completed to date with NEKTON, PC-8,
SEA LINK and DEEPSTAR 2000. The larger
submersibles DEEP QUEST and ALVIN have
also been chartered, but on a very modest
scale. MUST’s (now Manned Undersea Activ-
ities or MUA) less than $1 million annual
program is aimed at using the state-of-the-
art capabilities of submersibles and not at
investing funds to enhance their instrument
or performance capabilities (45).

Emphasis in the submersible field has
shifted from the Federal government to the
offshore oil industry. Although the count
varies, at least five vehicles are presently
operating in the North Sea; the most ambi-
tious operation being Vickers Oceanics Ltd.,
which owns PISCES I, II and III, VOL-LI
and in 1973 leased DEEP DIVER and SUR-
VEY SUB 1.

Large-scale international exploration of
the Mid-Atlantic Ridge commenced in the
summer of 1973 and will continue through
1974. This program, FAMOUS, will use AL-

VIN, SP-3000 and ARCHIMEDE and is
jointly funded by the French and American
governments to survey and conduct research
into the genesis and characteristics of this
most impressive undersea mountain range.

It should be evident that the field of deep
submergence is quixotic and, as Mr. Horton
forecast some 6 years past, **. . . what mar-
ket there was would experience energetic
competition with the weaker companies
falling by the wayside.’ In 1968 it would
have taken the foresight of Cassandra to
prophesize Westinghouse, North American
Rockwell, General Dynamics, Grumman Aer-
ospace, Reynolds and General Motors as
“weaker” companies. But if participation in
submersible activities is the yardstick, then
that is precisely the case, for each of these
giant corporations has retired from active
participation. Albeit, Westinghouse main-
tains token representation with DS-2000.

Interestingly, the stronger companies
turned out to be “backyard” builders who
offered simple, relatively inexpensive sub-
mersibles instead of the deep, sophisticated
and expensive variety. Two submersible
builders dominate today: Perry Submarine
Builders and International Hydrodynamics
Ltd. (HYCO). The Perry organization has
built 13 vehicles (PC3-X, PC-3A (1 & 2), PC-
3B, PLC-4, PLC-4B, PC5-C, PC-8, PC-9,
PC-15, PS-2, OPSUB, PC-14) and is in the
process of constructing 4 more. The majority
of Perry’s business, however, resides in the
construction of diver delivery and support
systems, not submersibles. On the other
hand, HYCO remains strictly a submersible
builder and has completed seven to date
(PISCES I, I, 111, 1V, V, SDL-1, AQUARIUS
I) with orders for six more (PISCES VI, VII,
VIII, AQUARIUS II, ARIES I & IT) on the
ledger.

Determining the number of operating sub-
mersibles is quite difficult owing to the spo-
radic nature of their use; some dive full time;
others, perhaps 1 or 2 months out of the
year. In any event, some 58 out of the more
than 100 submersibles built since FNRS-2
are operating. The status of individual vehi-
cles is given in Chapter 4; it is of interest to
note that most of the operational submers-
ibles are shallow ones, and dive to less than
2,000 feet. The deeper vehicles are largely

70

government-supported vehicles of the United
States and France.

Scientific diving is now a small part of
submersible activities; instead, engineering
tasks, such as pipeline and cable inspection,
are the dominant activities. And, at the mo-
ment, the submersible industry has focused
on the North Sea.

Since discovery and development of the
North Sea oil in the late sixties and early
seventies, Vickers Oceanics Ltd. of Barrow-
in-Furness has been and is the major sup-
plier of submersible services in this area. In
a 1972 report, Goudge (46) shows a 1969 total
of 40 operating days for PISCES II growing
to a total of 500 operating days for three
submersibles (PISCES I & IT and an uniden-
tified diver lock-out vehicle) in 1972.

Two of the most obvious questions concern-
ing this resurgence in submersible activity is
why now and why the North Sea? Mr. G. S.
Henson of Vickers presented his answers in a
report at a Heriot-Watt University Seminar
in early December 1973. The North Sea can
be one of the most inhospitable areas in the
world and, according to Henson, its condi-
tions are characterized by:

—Average sea states and extremes of
weather conditions significantly worse
than previously encountered in routine off-
shore operations.

—Strong tidal currents and turbidity.

—Greater water depths than previous oil
extracting workings; 650 feet at present
with oil-bearing potential extending to
depths of 975 feet to 2,000 feet for future
development.

—Low water temperature.

Within these conditions a diver quickly runs
out of breathing gas and strength and is
frequently cold and frightened. Additionally,
the diver stirs up a cloud of bottom sedi-
ments and is unable to wait for it to clear
because of his limited gas supply. From a
mechanical point of view, divers offer little
or no power at their elbows.

Acknowledging the technical limitations of
remote submersible work tools, Henson lists
their advantages over the diver as being a
“shirt sleeve’? environment, a reasonable
power supply and the ability to bottom for
several hours to wait until conditions clear.

Working in concert with the diver, who can
provide specialized functions, the lock-out
submersible will improve his performance by
conserving life support, removing the fear of
loneliness, providing additional power for
tooling and improving work time by using
the submersible’s freedom for search and
approach to the work site. Henson predicts
that by 1980 the submersible and the satu-
rated ambient diver will be equals in annual
earnings (utilization). One might take issue
with such predictions, but the orders of mag-
nitude of submersible utilization shown by
Goudge are irrefutable evidence of an in-
creasingly significant role for such vehicles
in the North Sea.

Predictably, Vickers’ activities have not
gone unnoticed by other submersible owners.

Fig. 3.34 This 55-ton hyperbaric section of PHOENIX 66 will be encapsulated into a
70-ft-long submersible for oil field work to 1,200 feet with a crew of seven. (Sub Sea
Oil Services, Milan)

HYCO’s PISCES V and one ARIES are slated
for North Sea leasing under their new par-
ent organization, Peninsular and Orient
Steamship Lines. Sub Sea Oil Services of
Milan, Italy has acquired the PS-2 and the
PC5C and is building an immense, mobile
working habitat designated PHOENIX 66
(Fig. 3.34) for North Sea application by 1974.
Taylor Divers’ TS-I is now working on a
long-term charter in the North Sea and
other European firms stand ready with their
entries.

The “new” future of submersibles is prom-
ising indeed, but the former participants
might correctly advise the newcomer to pro-
ceed with caution. Whether they will heed
such advice is speculative, for once again the
manned submersible finds itself a most
newsworthy item:

“The energy crisis has created demand
for little submarines to lay underwater
pipelines and explore along the ocean
floor for oil. Suddenly the demand (for
submersibles) far outstrips supply as oil
exploration activity picks up.”

—THE CHRISTIAN SCIENCE MONI-
TOR
22 January 1974

REFERENCES

1. Beebe, W. 1934 Half Mile Down. Har-
court, Brace & Co., New York.

2. Mark, R. F. 1967 They Dared The Deep.
The World Pub Co., New York.

3. Piccard, A. 1954 In Balloon and Bathy-
scaphe. Cassell & Co. Ltd., London.

4. U.S. Navy Diving Manual. 1970 NAV-
SHIPS 0994-001-9010, Navy Dept., Wash-
ington, D.C., 687 pp.

5. Houot, G. S. and Wilhm, P. H. 1955 2,000
Fathoms Down. E. P. Dutton & Co., New
York.

6. Maxwell, A. E., Lewis, R., Lomask, M.,
Frasetto, R. and Rechnitzer, A. 1957 A
Preliminary report on the 1957 investi-
gations with the bathyscaph, TRIESTE
(unpub. manuscript).

7. Dr. Andres Rechnitzer, Office of the
Oceanographer of the Navy, Alexandria,
Va. (Personal Communications)

ite)

10.

WT

18.

25.

26.

. Terry, R. D. 1966 The Deep Submersible.

Western Periodicals Co., North Holly-
wood, California, 456 pp.

. Pieeard, J. and Dietz, R. S. 1960 Seven

Miles Down. G. P. Putnam’s Sons, New
York.

Dr. Melchiorre Masali, Univ. of Torino,
Torino, Italy (Personal Communication).

. Edmund S. Martine, SUBMANAUT En-

terprizes, Miami Beach, Florida (1967
Personal Communication).

. Burt L. Dickman, Auburn, Indiana (1973

Personal Communication).

. Cousteau, J. Y. 1956 The Living Sea.

Harper & Row, New York.

. Cousteau, J. Y. and Dumas 1953 The

Silent World. Harper & Row, New York.

. Shenton, E. H. 1972 Diving For Science.

W. W. Norton & Co., New York.

. Parrish, B. B., Akyuz, E. F., Anderson, J.,

Brown, D. W., High, W., Peres, J. M. and
Piccard, J. 1972 Submersibles and under-
water habitats; a review. Underwater
Jour., August, p. 149-163.

Toggweiler, M. 1966 SUBMARAY, Two-
man utility submarine. A paper pre-
sented at the AIAA Symposium on Mod-
ern Developments in Marine Sciences,
Los Angeles, California, 21 April 1966.
Rechnitzner, A. B. and Walsh, D. 1961
The U.S. Navy bathyscaph TRIESTE,
1958-1961. A presentation to the Tenth
Pacific Science Conference, Honolulu,
Hawaii, 21 August-September 1961.

. Undersea Tech. 1962 July/August.
. Covey, C. W. 1964 ALUMINAUT. Under-

sea Tech., v. 5, n. 9, p. 16-23.

. Harter, J. R. R. 1964 Personal Communi-

cation to Undersea Technology printed
in March 1964.

. Munske, R. E. 1964 ALUMINAUT near

completion. Undersea Tech., April 1964.

3. Undersea Tech., April 1963.
. Andrews, F. A. 1965 Search operations

in the THRESHER area 1964. Naval
Engineer’s Jour., August & October 1965
(2 sections).

Galantin, I. J. 1965 Vehicles for deep
ocean technology. Shipmate, May, p. 24—
29.

Forman, W. R. 1966 DEEP JEEP from
design through operation. Jour. Ocean
Techeav. 1) ne leepali—23

72

31.

32.

33.

34.

35.

36.

37.

38.

39.

40.

41.

42.

43.

. Undersea Tech., September 1964.
. Loughman, R. and Butenkoff, G. 1965

Fuel cells for an underwater research

vehicle. Undersea Tech., Sept., p. 45-46.

. Vetter, R. C. 1970 Growth and Support of

Oceanography in the United States
1958-1968. National Academy of Sci-
ences-National Resource Council Report,

44 pp.

. Federal Marine Science Program, Fiscal

Years 1968-1969 and 1970.

Thomas F. Horton, Living Sea Corp., Los
Angeles, California (Personal Communi-
cation).

Andrews, F. A. 1967 An analytical re-
view of lessons learned from the H-
Bomb sea search off Spain. Pt. 1,
Search, classification, and recovery.
Proc. 4th U.S. Navy Sym. Military
Oceanog., v. 1, p. 3-28.

Gaul, R. D. and Clarke, W. D. 1968
GULFVIEW Diving Log. Gulf Univ. Res.
Corp., Pub. No. 106, College Station,
Texas, 37 pp.

Summary of Commercial Leasing by
Navy Activities. Enclosure (1) to Chief of
Naval Materials ser. ltr. MAT 0327/DUB
of 27 June 1969.

Slates, E. F. 1968 HIKINO mock-up, an
operational two-man catamaran sub-
mersible. Naval Weapons Center Tech.
Note 404—65-68, 39 pp, 2 appendices.
Lang, R. G. and Scholtz, P. D. 1963 A two-
man plexiglass submarine for oceanic
research. Undersea Tech., April, p. 26.
Ocean Industry 1969, v. 4, n. 1.

Munz, R. 1967 PX-15: A design for fu-
ture needs. Data Magazine, November.
Horton, T. F. 1968 Inside undersea vehi-
cle systems. The Ocean and the Investor.
Dean Witter & Co. Pub., p. 75-82.

R. Bradley, Arctic Marine Ltd., Vancou-
ver, B.C. (Personal Communication).
Westinghouse Ocean Research Labora-
tory. 1971 DEEPSTAR/SEARCHSTAR
Research Submersible System CD-71-7-—
800, 15 pp.

Piccard, J. 1971 The Sun Beneath The
Sea. Charles Scribner’s Sons, New York,
405 pp.

La Prairie, U. 1972 Recent achievements
of the French in offshore technology.
Ocn. Ind., April, p. 115-120.

44, Undersea Tech., October 1969. 46. Goudge, K. A. 1972 Operating experience

45. Miller, J. W. and Beaumariage, D. C. 1972 with PISCES submersibles. Conf. Papers.
NOAA’s Manned Undersea Science and Oceanology International ’72, Brighton,
Technology Program. National Oceanic England, 19-24 March 1972, p. 270-273.
and Atmospheric Agency (unpublished
manuscript).

73

MANNED SUBMERSIBLES:

1943-1974

The construction and performance charac-
teristics of 88 submersibles built or under
construction during the period 1948 through
1974 are presented in the following pages.
Not all submersibles built during this period
are represented, but only those for which
sufficient details are available to provide an
adequate description. In some cases there
are several vehicles of one type; for example,
the K-250 is one of nine vehicles built to a
design of Mr. G. Kittredge; 10 additional
pressure hulls of this design were con-
structed, but there is no indication that they
saw completion to a final vehicle. The
SPORTSMAN 300 and 600 series are other
examples where some 20 models are alleged
by various sources to have been constructed,

75

but only 3 can be accounted for in the litera-
ture and from personal communications
within the field. In all then, over 182 sub-
mersibles, not including the Soviet bloc, were
built to at least the pressure hull stage of
completion in this 26-year period. For ready
reference and from a historical aspect, Table
4.1 lists all known vehicles and their perti-
nent characteristics.

The great majority are one-of-a-kind and
show little commonality in design and perfor-
mance. This diversity of design is matched
by diversity in definition of terms used to
describe the various vehicles and their per-
formance characteristics. ‘“‘Payload” and
“Endurance,” for example, may be defined
quite differently by the owner and the user,

and both, for their own purposes, may be
correct. For reasons of clarity, definitions of
the dimensional and performance terms used
in the following descriptions are given below.
Definitions of the specific terminology used
within these categories can be found in the
appropriate chapters.

DIMENSIONAL/PERFORMANCE
TERMS

Length, Beam, Height, Draft: See Figure
ati.

Weight (dry): In-air vehicle weight in a
ready-to-dive condition with only operating
and hotel equipment aboard.

Operating Depth: The deepest depth a sub-
mersible can operate and maintain a speci-
fied safety factor, usually 1.5 or greater.

Collapse Depth: The computed depth (de-
termined by model testing or calculations
based on materials testing) at which a pres-
sure-resistant structure, e.g., pressure hull,
will fail owing to ambient pressure.

Hatch diameter: Least diameter of the per-
sonnel entrance orifice in the pressure
hull. Where the opening is a truncated cone
this dimension is the minimum diameter.

Life Support: The total time (in hours),
including normal and emergency systems,
available to sustain one ‘‘average’’ man
within a closed pressure hull. (See Chapter 9
for definition of an ‘‘average man.”’)

Total Power Capacity: Total electrical
power, in kilowatt hours (kWh), a submers-
ible’s power plant can generate to supply
propulsion, hotel load and scientific work
equipment. Derived from (total voltage
ampere hours) /1,000.

Speed/Endurance: Expressed in knots (6,-
080 ft/hr) and calculated, not from total kWh,
but from that portion of the power supply
devoted to propulsion. The employment of
lights, echo sounders and other equipment
requiring electrical power will detract from
the endurance stated.

Pilot: The number of individuals required
to safely control the submersible in all as-
pects of a dive.

Observers: The number of individuals a
submersible may routinely carry on a dive
who are in no way required for control of the
submersible.

76

Payload: The total weight which may be
placed aboard (internally and externally) a
submersible after the pilots/observers and all
other equipment or supplies are aboard
which are required to conduct a dive to its
operating depth under routine, safe condi-
tions.

COMPONENT/SUB-SYSTEM TERMS

Pressure Hull: The pressure-resistant com-
ponent of a submersible wherein the human
occupants reside.

Ballast/Buoyancy: The means whereby a
submersible attains negative or positive
buoyancy to dive and surface, and to attain
small-scale changes in + buoyancy when
submerged.

Propulsion/Control: The devices a vehicle
carries to propel it horizontally (main propul-
sion), vertically and laterally (thrusters), and
the systems (dive planes and rudders) used
to control its attitude (pitch, roll, yaw) under-
way.

trim: The systems available to attain up/
down bow angles (pitch) or list angles (roll)
through movement of weights or liquids for-
ward or aft, or port/starboard. In some in-
stances a builder defines trim as the means to
attain small-scale buoyancy adjustments
when submerged; where this is the case, it has
been included under Ballast/Buoyancy.

Power Source: The nature and total quan-
tity of onboard energy (mainly electrical)
carried by the submersible when diving.

Life Support: The oxygen supply, carbon
dioxide removal systems, temperature con-
trol devices, atmospheric monitoring instru-
ments, etc., carried aboard.

Viewing: Dimensions, quantity and loca-
tion of viewports and other devices providing
the occupants of the pressure hull direct
viewing of the external environment.

Operating/Scientific Equipment: Perma-
nently installed submersible equipment
used: 1) By the operator—to communicate on
and under the surface, to monitor vehicle
attitude and location and to determine the
presence of possible hazards; 2) By the ob-
server—to attain environmental information
such as water temperature, bottom relief,

etc. This category is the most likely subject
for change.

Manipulators: The devices with capabili-
ties approximating those of the human arm
and hand and which permit an operator
within the submersible to carry out specific
work functions outside the submersible.

Safety Features: Systems or components
whereby the occupants of the vehicle may
deal with emergencies such as power loss,
normal deballasting loss, fire, entanglement,
etc.

Surface Support: The combination of
equipments, systems and personnel neces-
sary to transport, prepare for launch,
launch, track, communicate with, retrieve
and otherwise service the submersible and
its occupants before, during and after actual
diving operations.

With the advent of the C5A all submers-
ibles, excluding AUGUSTE PICCARD, ARGY-
RONETE, NR-I and the bathyscaphs, are
air, sea and land (truck or rail) transportable.
Only a few have a permanent support plat-
form; for those that do, the name and nature
of the support platform is included. Submers-
ibles relying on charter ships or “Ships of
Opportunity” are noted as “SOO.”

External Lighting: Lights located outside
the pressure hull are used for viewing, pilot-
ing, etc. The majority of submersibles have a
capability for external illumination; those
that do not, need merely purchase an off-the-
shelf underwater light. Rearrangement and
modifications to lights are quite common and
simple to conduct. For these reasons no de-
scription of a submersible’s lighting ar-
rangement or quantity is provided, for it is
too likely to change.

The references provided are the sources
from which descriptions of specific submers-
ibles were obtained. In many instances the
data was acquired from builders’ brochures
or specifications. In some cases it was de-
rived from personal contact with the builder;
where this is the case it is so noted.

REFERENCES

ALL OCEAN Fact sheet and Operating In-
INDUSTRIES structions from All Ocean In-
dustries, Inc., Houston, Texas

77

ALUMINAUT Sheets, H.E. and Loughman,
R.R. 1964 The ALUMINAUT.
Paper presented at the 1st
Ann. Meeting of the Ameri-
can Institute of Aeronautics
and Astronautics, Wash.,
D.C., 29 June-2 July 1964.
AIAA No. 64-459

Mavor, J.W., Froehlich, H.E.,
Marquet, W.M. and Rainnie,
W.O. 1966 ALVIN, 6,000-ft
submergence research vehi-
cle. Paper presented at the
Ann. Meeting, New York,
N.Y., Nov. 10-11, 1966 of The
Soc. of Naval Architects and
Marine Engineers, n. 3, 32 pp.

ALVIN

AQUARIUS I

ARIES I

PISCES I, II,
III, IV, V

International Hydrodynam-
ics Ine., North Vancouver,
B.C. Fact sheets and personal
communications with staff
members. Vickers Oceanics
Ltd. advertising brochure

Le Bathyscaphe AR-
CHIMEDE. Technical bro-
chure published by D.C.A.N.
Toulon, March 1971

Willm, P. 1971 Project ARGY-
RONETE. A talk delivered at
the OCEANEXPO Collo-
quium 9-12 March 1971, Bro-
deaux, France

Brancart, C.P. and Hoffman,
G.H. 1967 STAR II A second
generation research subma-
rine. Trans. 3rd Ann. Mar.
Tech. Soe. Conf. & Exhibit, 5-
7 June 1967 San Diego, Calif.,
p. 459-478

The submarine AUGUSTE
PICCARD. Technical De-
seription published by The
Swiss National Exhibition,
Lausanne, Switzerland 1964
Black, D.C. 1968 BEAVER
MK IV Submarine Work
Boat. Tech. Description T8-
1473/020. Ocn. Sys. Opera-
tions of North American
Rockwell Corp., Anaheim,
Calif.

ARCHIMEDE

ARGYRO-
NETE

STAR II
ASHERAH

AUGUSTE
PICCARD

BEAVER

BEN FRANK-
LIN

BENTHOS V

DEEP DIVER
PC-3A (1&2)
PC-3B

PC3-X

PCSC

PC-8

PC-14

PS-2

SHELF DI-
VER
SURVEY SUB
1

VOL-L1

DEEP JEEP

DEEP
QUEST

DEEPSTAR
2000

DEEPSTAR
4000

DEEPSTAR
20000

Grumman Aircraft Engineer-
ing Corp., Bethpage, New
York. 1969 BEN FRANKLIN,
Brief Systems Description
Data and Controls Div., Lear
Siegler Inc., Deep River,
Conn. (Response to the Com-
mittee on Marine Research,
Education and Facilities (IC-
MAREF) questionnaire, 1969
and personal communication
from Garrison Divers, Corp.,
to CDR R. Nevin of NOAA)
Fact Sheet Perry Submarine
Builders, Riviera Beach, Fla.,
and personal communications
with Perry staff

Forman, W.R. 1966 DEEP
JEEP from design through
operation. Jour. Ocn. Tech.,
v.1,n.1, p. 17-23

Lockheed Missiles & Space
Co. 1968 Lockheed DEEP
QUEST Submersible System.
LMSC/D080197 Revision b
Eliot, F. 1967 The design and
construction of the DEEP-
STAR 2000. Trans. 3rd Ann.
Mar. Tech. Soc. Conf. & Ex-
hibit, 5-7 June 1967, San
Diego, Calif., p. 479-492
Westinghouse Electric Corp.
1967 DEEPSTAR-4000 Oper-
ation and Maintenance
Manual, v. 1, pt. 1, Pub.
A32213B710

Shenton, E.H. 1968 Exploring
The Ocean Depths. New
York, W.W. Norton & Co.
Pritzlaff, J.A. 1970 DEEP-
STAR-20,000. Trans. Mar.
Tech. Soc. 6th Ann. Conf. &
Expo. v. 2, p. 817-836

DEEP SUB- Northrop Services, Ine., Ar-

MERGENCE
RESEARCH
VEHICLE

DEEP VIEW

DOWB

FNRS-2
TRIESTE I
FNRS-3

GOLDFISH

GRIFFON

GUPPY

HAKUYO

HIKINO

JIM

78

lington, Va. 1972 Proposed
DSRV Operational Manual.
Contract N00024-72-C-0207
Forman, W.R. 1972 Develop-
ment & sea trials of the glass
submersible DEEP VIEW.
Preprints The 2nd Interna-
tional Ocn. Dev. Conf., Tokyo,
v. 1, p. 810-819

Daubin, S.C. 1967 The Deep
Ocean Work Boat (DOWB)
an advanced deep submer-
gence vehicle. Paper No. 67-
360 of Joint AIAA/SNAME
Advanced Marine Vehicle
Meeting, Norfolk, Va., 22-24
May

Piccard, A. 1956 Earth, Sky
and Sea. Oxford Univ. Press,
New York

Dickman, B.L., Auburn, Indi-
ana (personal communica-
tion)

Foex, J.S. 1974 Le GRIFFON.
L’Aventure Sous-Marine

Techniques et Exploration, n.
97, p. 18-21

Watson, W. 1971 The design,
construction, testing and op-
eration of a deep-diving sub-
mersible for ocean floor ex-
ploration. Paper presented
in the Transactions of the
Annual Meeting of The Soci-
ety of Naval Architects and
Marine Engineers, Nov. 11-
12, New York, p. 405-483

Arakai, A. 1972 The Opera-
tion by the HAKUYO. Pre-
prints The 2nd International
Ocean Dev. Conf., Tokyo, v. 1,
p. 820-828

Slates, E.F. 1968 HIKINO
Mock-up, an operational
two-man catamaran sub-
mersible. Naval Weapons
Center Tech. Note 404-65-68.
38 pp. with Appendices

1973 One atmosphere diving
suit passes tests for deep

JOHNSON
SEA LINK

K-250

KUMUKAHI

KUROSHIO
IT

SHINKAI
YOMIURI

MAKAKAT

MERMAID I1/
TT & WI/IV

MINI DIVER

NAUTI-

LETTE

NEKTON
ALPHA,
BETA,
GAMMA

NEMO

water. Ocean Ind., Aug., p.
26-28

Kelsey, R.A. and Dolan, R.B.
1970 The JOHNSON-SEA-
LINK—The first deep diving
welded aluminum submers-
ible. Trans. Amer. Soc. Mech.
Eng. Winter Ann. Meeting,
Nov. 29-Dec. 3, New York,
Pub. No. 70 WA/Unt 6, 12 pp.
Kittredge, G., Kittredge In-
dustries, Inc. Warren, Me.,
04864 (A brochure, no date)

Forman, W.R. 1970 KUMU-
KAHIT paper presented at
ASME Ann. winter meeting.
(70-WA/Unt-11)

Sasaki, T. 1970 On underwa-
ter observation vessels in Ja-
pan. Preprints Mar. Tech.
Soc. 6th Ann. Conf. & Expo.,
June 29-July 1, Wash., D.C., v.
1, p. 227-262

Talkington, H.R. and Mur-
phy, D.W. 1972 Transparent
Hull Submersibles and the
MAKAKATI. NURDC Rept.
NUC TP 283, 24 pp.

NURDC Hawaii Laboratory,
1970 A systems Description of
the Transparent Hulled Sub-
mersible MAKAKAIT (unpub.
manuscript)

Bruker-Physik A.G., Karls-
ruhe, West Germany, Vehicle
fact sheets and personal com-
munication with Mr. J. Haas
Great Lakes Underwater
Sports Inc., Elmwood Park,
Ill. Personal communication
with Mr. J. Strykowski

Brochure from Nautilette
Inc., Ft. Wayne, Ind.
Personal communication with
Messrs. Douglas Privitt and
J. W. Vernon of General
Oceanographics, Inc., New-
port Beach, Calif.

Rockwell, P.K., Elliott, R.E.
and Snoey, M.R. 1971 NEMO,

a new concept in submers-

79

NEREID 330

OPSUB

PAULO I

SDL-1

SEA CLIFF
TURTLE
TRIESTE II

SEA OTTER

SEA RANGER

SEA-RAY

SNOOPER

SP-350

SP-500

ibles. NCEL Tech. Rept.
R749, 68 pp.

Personal communication with
Dr. Ir. H.H. Lok of Nereid nv.
Yerseke, Holland

OPSUB Instruction, Opera-
tion and Maintenance Man-
ual. Ocean Systems Ince.,
11440 Isaac Newton Indus-
trial Sq. N., Reston, Va. 22090
Fact sheet from Anautics,
Inc., San Diego, Calif., 1969
Systems Description and Op-
erations Manual. SUB-
MERSIBLE DIVER LOCK-
OUT (SDL-1). Canadian
Forces Technical Order C-23-
100-000/MG-V01, dated 18
July 1978, prepared by Inter-
national Hydrodynamics Ltd.

U.S. Navy Submarine Devel-
opment Group One, San
Diego, Calif. Fact Sheets and
personal communication with
Group personnel

Aretic Marine Ltd., North
Vancouver, B.C. Personal
communication with R. Brad-
ley and staff members

Verne Engineering, Mt. Cle-
mens, Mich. SEA RANGER
600. (Technical Description
of general capabilities)

Submarine Research and De-
velopment Corp., Lynnwood,
Wash. (Response to IC-
MAREF questionnaire)

Undersea Graphics, Torr-
ance, Calif. Design Informa-
tion on Undersea Graphics 2-
man Submersible SNOOPER

Cousteau, J.Y. and Dugan, J.
1963 The Living Sea. New
York, Harper & Row

Small Bathysphere PUCES
500. Technical description
from Centre D’Etudes Ma-
rine Avancees, Marseilles,
France

SP-3000

SPORTSMAN
300 & 600

STAR I

SUBMANAUT
(Helle)

CNEXO technical description
SOUCOUPE PLONGEANTE,

S.P. 3000 SUBMANAUT
Terry, R.D. 1966 The Deep (Martine)
Submersible. Western Peri-
odicals, No. Hollywood, Calif. SUBMARAY
Underwater Development
Engineering Research and SURV
Development Department,
Gen. Dynamics Corp., 1966
Underwater Equipment
Availability. (Technical de-
seriptions of all Gen. Dyn. TOURS 64 &
produced submersibles) 66
J.R. Helle, Oceanic Enter-
prises, San Diego, Calif., (Re-
sponse to ICMAREF ques-

\—— BEAM

DRAFT

tionnaire, 1969) and personal
communications

Report of Survey by Capt . C.
Holland, Miami, Fla., of 16
Aug. 1968

Fact sheets from Hydrotech
Co., Long Beach, Calif.
Lintott Engineering Ltd.,
Horsham, Sussex, England
Technical Description of
SURV, Standard Underwater
Research Vehicle

Personal communication with
P. Kayser of Maschinenbau
Gabler GmbH, Lubeck, Fed-
eral Republic of West Ger-
many

—|

ae
a
a)
ae
+

——> LENGTH >|

Fig. 4.1. Submersible dimensions

80

TABLE 4.1 SUBMERSIBLES — PAST, PRESENT, FUTURE

(AUGUST 1975)

ee

Operating
Year Depth
Builder Owner Launched (ft) Crew Status
ALUMINAUT Gen. Dynamics Reynolds International
Groton, Conn. Richmond, Va. 1964 15,000 6 Inactive
ALVIN General Mills Inc. U.S. Navy 1964 12,000 3 Operational
AQUARIUS | HYCO
Vancouver, B.C. P & O Intersubs 1973 1,200 3 Operational: 1
ARCHIMEDE French Navy French Navy Under construction: 2
Toulon 1961 36,000 3 Operational
ARGYRONETE Center for Advanced CNEXO Construction Halted
Marine Studies (CEMA) Paris - 1,970 10 in 1971
ASHERAH Gen. Dynamics Technoceans
Groton, Conn. New York City 1964 600 2 Inactive
AUGUSTE Giovanola Bros. Horton Maritime Expl. Operational by January
PICCARD Monthey, Switzerland Vancouver, B.C. 1963 2,500 * 1976
*Has carried 45 people
BEAVER North Amer. Rockwell International Underwater
Seal Beach, Ca. Contractors,
New York City 1968 2,000 4 Operational
BEN FRANKLIN Giovanola Bros. Horton Maritime Expl.
Monthey, Switzerland Vancouver, B.C. 1968 2,000 6 Not operating
BENTHOS V Lear Siegler, Inc. Garrison 8 Divers
Deep River, Conn. Seattle, Wash. 1963 600 2 Not Operating
CHIHIRO Kawasaki Heavy Ind. Japanese Government 1975 164 6 Experimental
Tokyo Rescue Vehicle
DEEP DIVER Perry Submarine Marine Sciences Ctr.
Riviera Beach, Fla. Ft. Pierce, Fla. 1968 1,350 4 On Display in
DEEP JEEP U.S. Naval Ord. Test Sta., Scripps Inst. Ocean. Miami, Florida
China Lake, Ca. La Jolla, Ca. 1964 2,000 2 Scrapped
DEEP QUEST Lockheed Missiles & Lockheed Missiles &
Space Corp. Space Corp.
Sunnyvale, Ca. Sunnyvale, Ca. 1967 8,000 4 Operational
DEEP SIX Deep Six Mar. Services
Miami, Fla. Unknown 1969 150 3 Playground Display
DEEPSTAR 2000 Westinghouse Elec. Westinghouse Ocn. Res.
Corp. & Eng. Ctr.
Annapolis, Md. 1969 2,000 3 Not Operating
DEEPSTAR 4000 Westinghouse Elec. COMEX
Corp. Marseilles
1965 4,000 3 Undergoing refit
DEEPSTAR 20000 Westinghouse Elec. Westinghouse Ocn. Res.
Corp. & Eng. Ctr. - 20,000 3 Construction Halted
Annapolis, Md. in 1970
Under control of
DEEP VIEW U.S. Navy U.S. Navy 1971 2,000 2 Southwest Res. Lab.
DOWB Gen. Mtrs. Corp. Friendship, S.A. Undergoing Refit
Santa Barbara, Ca. Miami, Fla. 1968 4,500 3 Undergoing refit
DSRV-1&2 Lockheed Missiles &
Space Corp.
Sunnyvale, Ca. U.S. Navy 1976; 1971 3,500;5,000 27 Undergoing sea trials.
FNRS-2 Auguste Piccard
Lausanne, Switzerland French Navy 1948 13,500 2 Not Operating

81

TABLE 4.1 SUBMERSIBLES — PAST, PRESENT, FUTURE (CONT.)

FNRS-3

GLOBULE
GOLDFISH

GRIFFON

GUPPY

HAKUGEI
HAKUYO

HIKINO

JIM

JOHNSON SEA LINK

K-250

KUMUKAHI
KUROSHIO |
KUROSHIO II

MAKAKAI
MERMAID I/II

MERMAID III/IV

MINI DIVER

MOANA I
MOANA Il

NAUTILETTE
NAUTILETTE

NEKTONA, B,C

Builder
French Navy

Burt Dickman

Auburn, Ind.

French Naval & Con-
struction yard

Brest

Sun Shipbuilding & Dry
Dock Co.

Chester, Pa.

Heiwa Kosakusho

Osaka, Japan

Kawasaki Heavy Ind.
Tokyo

U.S. Naval Weapons
Center

China Lake, Ca.
Underwater Marine Equip.
Ltd.

Farnborough, Hants, Eng-
land

Aluminum Co. of
America (ALCOA)

G. W. Kittredge
Warren, Me

Oceanic Institute
Makapuu, Hawaii
Japan Steel & Tube
Corp. Tokyo

Japan Steel & Tube
Corp. Tokyo

U.S. Navy
Bruker-Physik, A.G.
Karlsruhe, West Ger.

Bruker-Physik, A.G.
Kar!sruhue, West Ger.

Great Lakes Unverwater
Sports
Elmwood Park, Ill.

Nautilette Inc.
Ft. Wayne, Ind.
Nautillete Inc.
Ft. Wayne, Ind.
Nekton, Inc.
San Diego, Ca.

Owner

French Navy

COMEX
Marseilles
Unknown

French Navy

Sun Shipbuilding & Dry
Dock Co.

Chester, Pa.

Tokai Salunge Co.

Toba, Japan

Sumitomo Shoji Kaisha, Ltd.
Tokyo

U.S. Naval Weapons
Center

China Lake, Ca.
Oceaneering International
Houston, Tx

Harbor Branch Foundation
Ft. Pierce, Fla.

Various

Oceanic Institute
Waimanalo, Hawaii
Univ. of Hokkaido
Hokkaido, Japan
Univ. of Hokkaido
Hokkaido, Japan
U.S. Navy
International
Underwater Contractors
New York City
Bruker-Physik, A.G.
Karlsruhe, West Ger.

Same

COMEX

Marseilles

COMEX

Marseilles

Mr. D. Haight
Warrensville, III.
Nautillete Inc. & Mr. C.
Russner, Nashville, Mich.
General Oceanographics
San Diego, Ca.

82

Operating
Year Depth
Launched (ft)
1953 13,500
660
1958 100
1973 1,970
1970 1,000
1961 656
1971 984
1966 20
1973 1,300
1971 1,000
1966 250
1969 300
1951 650
1960 650
1971 600
1972 984
1974 656
1968 250
1,326
' 1,320
ca. 1964 100
ca. 1964 100
1968, 1970,
1971 1,000

Crew

Status

Reconfigured from
FNRS-2. Retired in
1960

Operational
Status unknown,
sold in 1973

Undergoing sea trials
as of Feb. 1974

Inactive
Tethered
Inactive

Operational

Not Operating;
Experimental

A pressure-resistant
diving suit; Under-
going sea trials. Has
been to 440 feet.
A second vehicle
will be completed
in 1976.

unknown

On display
Retired in 1960

Not Operating
Not Operating

Operational

To be operational
by 1976

Not Operating
Operational
Operational

Operational

Both vehicles opera-
tional

All three vehicles
operational

NEMO
NEREID 330
NEREID 700
NR-1

OPSUB

PAULO!

PC-3A (1&2)

PC-3B (TECH DIVER)

PC3-X

PC5C

PC-8B
PC-1201
PC-1202
PC-1401
PC-1402
PC-16

PHOENIX 66

PISCES |
PISCES II
PISCES III
PISCES IV
PISCES V
PISCES VI
PISCES VII
PISCES VIII
PISCES X

PISCES XI

TABLE 4.1 SUBMERSIBLES — PAST, PRESENT, FUTURE (CONT.)

Builder

U.S. Navy

Nereid nv.
Schiedam, Holland
Nereid nv.
Schiedam, Holland
Gen. Dyn. Corp.
Groton, Conn.
Perry Sub. Builders
Riviera Beach, Fla.
Anautics Inc.

San Diego, Ca.

Perry Sub. Builders
Riviera Beach, Fla.
Perry Sub. Builders
Riviera Beach, Fla.

Perry Sub. Builders
Riviera Beach, Fla.
Perry Sub. Builders
Riviera Beach, Fla.

Perry Sub. Builders
Riviera Beach, Fla.
Perry Sub. Builders
Riviera Beach, Fla.
Perry Sub. Builders
Riviera Beach, Fla.
Perry Sub. Builders
Riviera Beach, Fla.
Perry Sub. Builders
Riviera Beach, Fla.
Perry Sub. Builders
Riviera Beach, Fla.
Sub Sea Oil Services
SPA

Milan, italy

HYCO

Vancouver, B.C.
HYCO

Vancouver, B.C.
HYCO

Vancouver, B.C.
HYCO

Vancouver, B.C.
HYCO

Vancouver, B.C.
HYCO

Vancouver, B.C.
HYCO

Vancouver, B.C.
HYCO

Vancouver, B.C.
HYCO

Vancouver, B.C.
HYCO

Vancouver, B.C.

Owner

U.S. Navy

Dutch Submarine Ser-
vices, Amsterdam
Dutch Submarine Ser-
vices, Amsterdam

U.S. Navy
Ocean Sys., Inc.
Reston, Va.
Same

U.S. Air Force

U.S. Army
International Under-
water Contractors
NYC, New York
Univ. of Texas
Austin, Tx.

Sub Sea Oil Services,
SPA

Milan, Italy

Northern Offshore Ltd.

London
Northern Offshore Ltd
London

Northern Offshore Ltd.

London

Texas A & M Univ.
College Station, Tx.
U.S. Army

Northern Offshore Ltd.

London
Same

Vickers Oceanics Ltd.

Barrow-in-Furness, Eng.

Vickers Oceanics Ltd.
Barrow-in-Furness
Vickers Oceanics Ltd.
Barrow-in-Furness
Dept. of Environment
Victoria, B.C.

P & O Intersubs
Vancouver, B.C.
Soviet Acad. Sciences
Moscow

Soviet Acad. Sciences
Moscow

Vickers Oceanics Ltd.
Barrow-in-Furness
HYCO Subsea, Ltd.
Vancouver, B.C.
Vickers Oceanics, Ltd.
Barrow-in-Furness

83

Year
Launched

1970

1972

Operating
Depth
(ft) Crew Status
Operated by South-
600 2 west Research Inst.
330 3 Operational
Due to be launched
700 4 in 1976
NA 7 Operational
2,000 2 Inactive
Reconfigured to
600 2 SEA OTTER
Retired in 1975
300 2
600 2 Not Operating
Operational
150 2 (dives occasionally)
Undergoing refit
1,200 3 (August 1974)
800 2 Operational
1,000 2 Operational
1,000 5 Operational
1,200 2 Operational
1,200 2 Operational
3,000 3 Under Construction
1,200 7 Under construction
1,200 2 Operational
2,600 3 Operational
3,600 3 Operational
6,500 3 Operational
6,500 3 Operational
6,500 3 Operational
6,500 3 Under Construction
6,500 3 Operational
6,500 3 Under Construction
6,500 3 Under Construction

PORPOISE

PRV-2

PS-2

QUESTER 1

SDL-1

SEA CLIFF

SEA EXPLORER

SEA OTTER

SEA RANGER

SEA-RAY

SHELF DIVER

SHINKAI

SNOOPER

SP-350

SP-500

SP-3000

SPORTSMAN 300

SPORTSMAN 600

STAR |

STAR Il

STAR III

TABLE 4.1 SUBMERSIBLES — PAST, PRESENT, FUTURE (CONT.)

Builder

Unknown

Pierce Submersibles
Bay Shore, N.Y.
Perry Sub. Builders
Riviera Beach, Fla.

Deep Sea Techniques
Brooklyn, N.Y.
HYCO

Vancouver, B.C.
Gen. Dynamics
Groton, Conn.

Sea Line Inc.

Brier, Wash.
Anautics Inc.

San Diego, Ca.

Verne Engineering
Mt. Clemens, Mich.
Submarine Res. & Dev.
Corp.

Lynnwood, Wash.
Perry Sub. Builders
Riviera Beach, Fla.
Kawasaki Heavy Ind.
Kobe, Japan

Sea Graphics Inc.
Torrance, Ca.

Office Francais de
Recherches Sous-Marine
Marseilles

Sud Aviation

France

Centre de |’Etudes Mar-
ine Avancees (CEMA)
Marseilles

American Sub. Co.
Lorain, Ohio

American Sub. Co.
Lorain, Ohio

Gen. Dynamics
Groton, Conn.

Gen. Dynamics
Groton, Conn.

Gen. Dynamics
Groton, Conn.

Owner

Pacific Sub. Co.
Seattle, Wash.

Same

Sub Sea Oil Services
SPA

Milan, Italy

Same

Canadian Forces
Halifax, Nova Scotia
U.S. Navy

Same

Candive Ltd.
Vancouver, B.C.
Same

Same

Unknown

Japanese Maritime
Safety Agency
Tokyo

Same

Campagnes Oceanogra-
phique Francaises (COF)
Monaco

COF

Monaco

CNEXO

Paris

Various

Various

Phila. Maritime Mues.
Phila. Pa.

Same

Scripps Inst. of Oceanog.

LaJolla, Ca.

Year
Launched

1970

1971

1972

1968

1968

1968

1969

1959

1969

1970

1961

1963

1963

1966

1966

Operating
Depth
(ft)

150

600

1,025
650
2,000
6,500
600
1,500

600

1,000

800

1,968

1,000

1,350

1,640

10,082
300
600
200

1,209

2,000

Crew

Status
A class of recreational
submersibles made in
West Germany and sold
in the U.S.

Under Construction

Operational
Inactive
Operational

Operational

Operational

Operational

Operating

Operational under Inter-
Sub, Marseilles
Operational

Operational

Operational

Operational
Unknown
Unknown
On display
Operational

Not Operating

84

TABLE 4.1 SUBMERSIBLES — PAST, PRESENT, FUTURE (CONT.)

Operating
Year Depth
Builder Owner Launched (ft) Crew Status

SUBMANAUT Helle Engineering Same
(Helle) San Diego 1963 200 2 Not Operating
SUBMANAUT Martine’s Diving Bells Submarine Services
(Martine) San Diego, Ca. Coral Gables, Fla. 1956 600 6 Not Operating
SUBMARAY C & D Tools Kinautics Inc.

Calif. Winchester, Mass. 1962 300 2 Scrapped
SURV Lintott Engineering Ltd. Same

Horsham, Sussex, Eng. 1967 600 2 Scrapped
TADPOLE-1 Mitsui Shipbuilding & Mitsui Ocn. Development

Engineering Co. Ltd. & Engineering Co. Ltd. Tethered

Tokyo Tokyo 1972 328 2 Inactive
TAURUS HYCO P & O Intersubs

Vancouver, B.C. Montrose, Scotland = 2,000 NA Under Construction
TOKAI Heiwa Kosakusho Tokai Salvage Co. Tethered

Osaka, Japan Toba, Japan 1954 656 2 Inactive
TOURS 64 Maschinenbau Gabler Kuofeng Ocean Dev.

GmbH Corp.

West Germany Taipei, Taiwan 1971 984 2 Operational
TOURS 66 Maschinenbau Gabler Sarda Estracione Lav-

GmbH orazione

West Germany Cagliari, Sardinia 1972 984 2 Operational
TRIESTE | Auguste Piccard in U.S. Navy

Trieste, Italy 1953 36,000 3 Retired. On display
TRIESTE II Mare Island Shipyard U.S. Navy

Mare Island, Ca. 1964 20,000 3 Operational
TS-1 (SURVEY SUB 1) _ Perry Sub. Builders P & O Subsea (UK), Ltd.

Riviera Beach, Fla. London 1970 1,350 3 Operational
TURTLE Gen. Dynamics U.S. Navy

Groton, Conn. 1968 6,500 3 Operational
URF Kockums Swedish Navy 2 Under Construction.

Malmo, Sweden = 1,510 25 Rescue sub.
UZUSHIO Nippon Kokankk Tethered

Tokyo Same 1973 658 2 Inactive
VASSENA LECCO Mr. G. Vassena Same

Torino, Italy 1948 1,335 2 Sunk
VIPER FISH Mr. Don Taylor Same

Atlanta, Ga. 1969 1,000 2 Unknown
VOL-L1 Perry Sub. Builders Vickers Oceanics Ltd.

Riviera Beach, Fla. Barrow-in-Furness 1973 1,200 4 Operational
YOMIURI Mitsubishi Heavy Yomiuri Shimbu News-

Ind. paper

Kobe, Japan Tokyo 1964 972 6 Scrapped
unnamed P. Dostal & C. Hair Same

Alvin, Tx. = 600 2 Under Construction
unnamed Charles Yuen Sub. All Ocean Industries

Hong Kong Houston, Tx. 1971 150 2 Not Operating
unnamed Robb Engineering Island Divers Assoc.

Amherst, Nova Scotia Seal Cove, New Brunswick 1970 600 1 Unknown

85

86

ILENIGSUTS coccochoooconc duooRoDeE Don DOOes aD
BENE coodesbpeusan cocoon sop osden uous eoR eon
(AMENGIRIVS so ov ane ooordeos aco DOCOMO e RD pOmiadsD
DIAVMFUS codooomododanocoggcuod OOS ouN OOOO aa

WEIGHT (DRY):

ORERATIN GID ERM i teetercataretajetetel=tareiat=fateltal latest ate
COPPARSEID ERM amecrrreraretsteraiersyaterpaictal crater ateteis
[LUNI PY MINES: “ooogagedececadesmauggcogong.

ALL OCEAN INDUSTRIES

RATICHIDVAMEME Rau snerrsicesietebesteneietre

15 ft
2 ee LIFE SUPPORT (MAX): ...........0-
pease MOMALIPOWERS his cniasmieaanteeen
ica Sacre SPEED (KNOTS): CRUISE ............
MAN cae. eae

1¥,

TeOtEE GCREWHPILOMS. ones eceecen. A es
a Saale @ESERWERS Cdobeedecoseucs ;
aa BAY, BOARDS a teeter eeu anes eae

Ba thein nce NAl

21% in.
24 man-hr

PRESSURE HULL: Cylindrical shape, acrylic plastic dome. Hull composed of Japanese Ashme steel % in. thick. Conning tower % in. thick. Hull

36-in. 1D. Dome 2-ft diam.; 1 in. thick.

BALLAST/BUOYANCY: Main ballast tanks blown by two 20-ft3-capacity scuba tanks. Four variable ballast tanks, two forward; two aft.
PROPULSION/CONTROL: Four, %-hp (each), port-starboard DC motors (Phantom M10). The motors are trained manually and rotate 360° in the

vertical.

TRIM: VBT's can be differentially filled either forward or aft to produce angle on the bow.
POWER SOURCE: Two 12-VDC lead-acid batteries inside pressure hull.

LIFE SUPPORT: Two 20-ft3-capacity OQ tanks. Automobile vacuum cleaner modified to hold potassium superoxide removes CO).
VIEWING: Conning tower dome and one forward-looking plastic viewport.

OPERATING/SCIENTIFIC EQUIPMENT: Pressure depth gage, compass.

MANIPULATORS: None.

SAFETY FEATURES: Manually-droppable 680-Ib weight. Pressure hull can be flooded for exit. Snorkel for surface breathing.

SURFACE SUPPORT: soo2.

OWNER: All Ocean Industries, Inc., Houston, Tex.
BUILDER: Charles Yuen Submarines, Hong Kong.
REMARKS: Not operating. Has been to 300 ft.

87

ALUMINAUT

FREN GENS eo rereye: upeteiera: o)'e: eicls es)ietatie se) agar satefehatehoiepttaraiapeie 51 ft HATCH DIAMETER: ........ Hull—19 7/8 in.; Sail—17 in.
BREEAM Eine avec open se =) ace 0) a) 0)/e) sini ele) e) « (eli=lisiie (sie) eis] a/ ein) 15.3 ft LFS SURF RT UIMER NS oobenoonoeodoooaan an 432 man-hr
HEIGHT: cee cee we eee rie wile e im eieisisinieie se 16.5 ft TOWN LIROMMSRIS Sooncnoodcsonesbchascgoo wes 300 kWh
DRAFT c\< wjeieie tein = e)0) 00 (nj0\0 0/0 0, a/ejeie siejsiejaleiejs)eism sie 9.5 ft SBEEDI(KNOmS) IC RUNS Ess revetenatel=neieeiniatstelslislsietcticle 1/75 hr
WISER (UPIRNAS eotcesopktoadeopokensesoroces 76 tons NVA eteiattattetaKatelnlisialiavelstanete terete tele 3/32 hr
OBE RAIN Gs DE CIIEN= alsin lane oretalininl-kakelmieliaiel steia 15,000 ft GREW RUE ORS i era eteltetelet nel eletelel eran fiat tear amie rake gene 3
COLEAPSE DEPT so ote nis cies aieleieie winis nism ss 22,500 ft OBSERWE!RS tremereteieiiteteitelsteteteiate alte teietataltet ae ineie tenets 3
EFAUNG HDA =) ercretaielate dieteieitteletslepevaiietatelatetslerel= ices) 1964 IMM(WOYNES sosdnsesddcosgaqcendousodeonoas04 3 tons

PRESSURE HULL: Cylindrical shape, constructed of aluminum alloy 7079-T6 into 11 forged cylinders and 2 hemispherical endcaps all of which are
bolted together. Cylinder length 43 ft 4in., OD 8.1 ft, thickness 6.5 in. Metal to metal contact between sections. All penetrations are in hemi-heads.
Hull thickness at viewports is 7 in.

BALLAST/BUOYANCY: Pressure hull provides primary positive buoyancy; seawater ballast tanks provide additional positive buoyancy. A
maximum of 4,700 Ib of iron shot ballast provides primary negative buoyancy in two tanks amidships port and starboard. Another source of primary
negative buoyancy is from a 4,400-lb lead bar in the keel. At 4,000-ft depth the ballast tanks can be blown free of water to obtain 2,000 Ib of
Positive buoyancy by displacing approximately 30 ft3 of water.

PROPULSION/CONTROL: Horizontal propulsion is from two reversible, 5-hp, DC motors mounted port and starboard on the stern. Vertical
Propulsion is from a 5-hp, DC motor mounted topside amidships. Stern-mounted dive planes provide addiiional underway control. Horizontal
maneuvering is through an electrically driven rudder or by using horizontal thrusters in Opposition or other combinations.

TRIM: Trim system is internal and consists of 300-Ib-capacity tanks from which water can be pumped fore and aft. Lead ballast in the form of 50-Ib
blocks can be manually shifted to maintain desired trim to +30° bow angle.

POWER SOURCE: Four 115-V, 400-amp-hr, silver-zinc batteries are in the pressure hull and provide nearly 20,000 Wh. The following forms of
power are available: 115 VDC direct from batteries (118-140 V long-term potential); 230 VDC direct (236-280 V long-term potential); 28 VDC
regulated (+10% voltage, +5% frequency) AC, 2.5-W, continuous; 115-V, 60-cycle super-regulated (+1% voltage, +0.03% frequency, 1 kW
continuous).

LIFE SUPPORT: ©; is supplied from two steel flasks of 127-ft3 capacity each. CO, removed from cabin air by blowing through a scrubber
containing 12 Ib LiOH.

VIEWING: Four viewports located in the bow provide a 160° (total) horizontal field of view through three of the ports and a vertical field of view
from 25° above the horizontal to 80° below through two ports. Each viewport is 7% in. thick with a 4-in. 1D and a 19-in. OD.
OPERA.TING/SCIENTIFIC EQUIPMENT: Two up/down Fathometers, CTFM sonar, side scanning sonar, closed circuit television w/light mounted
On Pan and tilt mechanism, tape recorder, exterior-mounted depth gage, gyrocompass and UQC.

MANIPULATORS: Two, each with six degrees of freedom.

SAFETY FEATURES: Shot (4,700 Ib) and lead keel bar (4,400 Ib) are electromagnetically held and may be dropped automatically or manually in
the event of a power failure. Oxygen Breathing Apparatus (OBA) is supplied which provides 2 hr of emergency breathing/occupant. Ballast tanks can
be blown at depths to 4,000 ft to supply some 2,000 Ib of positive buoyancy.

SURFACE/SHORE SUPPORT: ALUMINAUT is towed by a 135-ft support ship to dive site or anchorage. Ship’s crew and support divers total 10;
submersible’s crew; pilot, co-pilot, 3 engineers. An operations officer coordinates the field effort and five additional personnel are ashore. The total
required to Operate the system is 21. Land facilities include a marine railway and barn to lift and shelter the vehicle for maintenance and repair.
OWNER: Reynolds International, Richmond, Va.

BUILDER: General Dynamics Corp., Groton, Conn.

REMARKS: Has not dived since 1969. Now in Jacksonville, Fla. Greatest depth reached was 6,250 ft.

STERN ACCESS TRUNK

VERTICAL PROPULSION
MOTOR

FORWARD SONAR DISPLAY
GY ROCOMPASS

PROPULSION MOTOR
SCANNING

C.T.F.M. BALLAST TANK

SHOT BALLAST TANK

KEEL SUPERSTRUCTURE

SIDE LOOKING SONAR
(UNDER BALLAST TANK)

BATTERY

PORT ILLUMINATOR

TV CAMERA
AND

ILLUMINATOR

OXYGEN FLASK

88

89

SAIL HATCH

SAIL VENT
AND BAFFLE <<
CTFM 2 a
SCANNING SAIL VENT AND LIFT PROPELLER
SONAR FLOOD VALVE VARIABLE
BALLAST
SPHERES SYNTACTIC
FOAM
Cine ayy STEERING RAM

YP KY

P yy, ,
C= pep
f

VIEWPORT

PRESSURE

HULL
MERCURY
TRIM MERCURY
TANK TRIM
THROUGH HULL WANS
ELECTRICAL MAIN PROPULSION
PENETRATORS AND MERCURY
SPHERE BATTERIES TRIM SYSTEMS
VIEWPORT RELEASE BATTERY OIL pROPULSION
ELECTRICAL VARIABLE \ RESERVOIR

DISCONNECT BALLAST VARIABLE

SYSTEM BALLAST
SPHERES

90

(HENISWIRE oococeono od one UCOU OO O00 O00 DIDO Dr Dsd 25 ft
ENE DGannodaosooon00 dO OUCU DMO Dee DOGO Dr OO Dig 8 ft
HEIGHT: 13 ft
DRAFT: 7% ft
ieierhr byrne ssasoncouu0GgGG 9 co DUO oe sO 16% tons
OPERATING DEPTH: ......-..222-.---2-20 12,000 ft
COPEABSEI DERM watelertelaj=-l<t-1-)=)=1< eis) ole) <)>) =) 18,000 ft
BPAUWINGHIDIATIES, tye c-tclc ciclelelel oy sisieeiaieier= nies se, 08/0 ele 1964

ALVIN

HATCH DIAMETER: ......-.22-e-e- eee eeeees 19 in.
LIFE SUPPORT (MAX): .225 ce ee wo cie ee 216 man-hr
MOMAL| POWER (fefererec sre selereemte)niaint~ inlets) sisieleis 40% kWh
SPEED (KNOTS): CRUISE ..........-.---------> 1/8 hr
We eo ocousnoepseo5 oo Dooe oc 2/2 hr

CSA VBIILOUS copsoobacdgoddedadcoroudasomocn ome 1
OBSERVERS pee ereletotedatereleleie) stots oles fiell=isteint-l=ln tei 2

PAN TLOVNDE oooponooddan doesn So soon o6Go0ns 1,000 Ib

PRESSURE HULL: Spherical shape. Composed of Navy 621.08 titanium, 7-ft OD, 1.97 in. thick to 2% in. at inserts.

BALLAST/BUOYANCY: MBT’s provide 1,500 Ibs of surface buoyancy. VBT’s consist of hard tanks and pump operable to 12,000 ft. Syntactic
foam provides approximately 4,000 Ib of positive buoyancy. A 250-lb weight is carried to decrease descent time; it is dropped at the bottom;

another 250-Ib weight is dropped for ascent.

PROPULSION/CONTROL: Main propulsion is from a 10-hp hydraulic motor driving a 50-in.-diam. propeller trainable 50° left or right. Thrusters
are located amidships which are powered by 6-hp hydraulic motors and are rotatable 360° in the vertical plane.

TRIM: Bow angles of +10° are obtained by transferring 450 Ib of mercury forward or aft.

POWER SOURCE: Three, pressure-compensated boxes of lead-acid batteries. Two boxes supply 30 V, the third supplies 60 V. Four 4-amp-hr

nickel-cadmium batteries supply emergency power.

LIFE SUPPORT: Gaseous O2 in pressure hull. LiOH is used to remove CO. O2 and CO2 monitors.
VIEWING: Four large viewports forward; these are 3% in. thick, 5-in. |D and 12-in. OD. A smaller viewport is in the hatch cover which is 2 in. thick,

2-in. 1D and 6-in. OD.

OPERATING/SCIENTIFIC EQUIPMENT: UQC with transponder interrogator. Four pressure depth gages, up/down echo sounder, TV, pinger,
current meter, CTFM sonar, gyrocompass, two-35-mm still.cameras, one 8-mm & one 16-mm cine cameras.

MANIPULATORS: One with six degrees of freedom.

SAFETY FEATURES: Manipulator, batteries (3,400 Ib) and specimen basket are attainable. Pressure sphere releasable (2,000 Ib of positive
buoyancy). Closed circuit emergency breathing off normal O supply. Distress rockets and flares, strobe lights, life vests, radio homing beacon.
SURFACE SUPPORT: Supported by the catamaran LULU, 105 ft LOA, 48-ft beam, 12-ft draft, 450-ton displacement, max. speed 6 knots,
propulsion from three 200-hp outboard motors. Seventeen people constitute the system's crew.

OWNER: U.S. Navy-owned. Operated by Woods Hole Oceanographic Institution, Woods Hole, Mass.

BUILDER: General Mills/Litton Industries, Minneapolis, Minn.

REMARKS: Stee! pressure hull replaced by titanium hull in 1973; thereby increasing depth range from 6,000 to 12,000 ft.

91

he a

92

AQUARIUS |

MEN Gilsht ciroreteletetatel fate t-b-tel-f-l-f-tetel-fel=kelsl»felelelels\alelie/eie 13% ft BHAT CHIDVAMETIE Rise iereistetsttetateletelnlelelele tele iei=[eiel=i=i= 19 in.
EVN chacdnonsanoosucoposge Toso UoUooHOo ooo 6 ft EUR ESSUPPO Rite (MAC) =i oretelnieltaiteletele/aleietep=(spe) els 108 man-hr
mMECnMis codeotinonooasomoogonocoopaUOoUGbOUDS 6% ft OMA OWE Retr eteneretetetstoletetelel-talntetaliafeley-tatelefanetel staf ala NA
IDIRVNEIS sogcoocononses Condo D Oe OOS oD ODDONnOODO 5% ft SPEEDI(KNOMS) FIC RIUISES te rererefeieteletel ele iefel-teteterenalereyel= NA
Ween (RA socdenconnonocoopodnDDeDooD 4% tons IMSS eacomobcnodudconosbcodnonoos 3
OBE RAIN GiD EPaitlaiecretect-iafa-telatafalebelai=valelals! al sleie 1,200 ft CREW SPNMOMS seapetetettatmtetel Vole ole re ian teleNe later =t-ie terror bat =r 1
COLLAPSE DEPTH: 2c. ccc ce cer eee teenie reese NA OBSERVERS ferctetaieletatalad=inlelatetnlsiefelet-f-lntahefatelel siels 2
EAWING HDA Eietelelonetalar-fetetelelet=felefalals\eelisiiela/s\s)si'ei\s)/« 1973 PAN CUOYN DE! sion acogobeso GoOsoongodnoadasgcese 1,100 Ib

PRESSURE HULL: Cylindrical shape of A516 grade 70 steel, 46-in. diam., 105 in. long.
BALLAST/BUOYANCY: Main ballast is from fore/aft mounted fiberglass tanks which are vented or blown dry to provide negative or positive
buoyancy, respectively. A low pressure surface buoyancy system is provided to obtain reserve buoyancy.

PROPULSION/CONTROL: Lateral movement is provided through a stern-mounted, reversible propeller capable of training 90° port or starboard
and powered by a pressure-compensated 5-hp motor. Vertical underway control is by port/starboard bow planes mounted forward and above the
bow viewing dome.

TRIM: Up/down bow angles can be controlled by bow planes. Two fore and aft fiberglass tanks, subdivided at centerline, can be filled with ambient
seawater or blown dry collectively or individually to provide both ballast and trim.

POWER SOURCE: Lead-acid batteries contained in pressure-resistant cylinders (20-in. diam., 96 in. long) of the same material as the pressure hull
are connected to provide a nominal voltage of 120 V at 225 amp-hr. A 15-V nickel-cadmium battery inside the pressure hull provides emergency
power.

LIFE SUPPORT: 039 is carried in two 70-SCF (nominal) tanks. CO is removed by LiOH cannisters.

VIEWING: One 39-in.-diam., acrylic plastic (grade G plexiglass) dome in forward end of pressure hull. Smaller viewports are elsewhere on conning
tower and hatch.

OPERATING/SCIENTIFIC EQUIPMENT: UQC, scanning sonar, depth gage, compass.
MANIPULATORS: One with six degrees of freedom.

SAFETY FEATURES: Jettisonable propulsion unit and manipulator claw. Emergency power (15-V Ni-Cad battery) in pressure hull. Self-contained
Oy rebreathers. Manually droppable weight. Life vests, dry chemical fire extinguishers and flashlights.

SURFACE/SHORE SUPPORT: Soo.

OWNER: International Hydrodynamics, Inc., Vancouver, B.C.
BUILDER: Same as above.

REMARKS: Operational.

93

VERTICAL

SCIENTIFIC THRUSTER
EQUIPMENT
AREA
GASOLINE SAIL
VENT VALVE

ACCESS HATCH
& TRUNK

TOWING
BIT
MAIN
PROPULSION
GASOLINE
BUOYANCY
TANK

STABILIZING
EEE SHOT VIEWPORT

GASOLINE

PRESSURE
BUOYANCY
TANK SPHERE

94

ARCHIMEDE

(L(ENGHIER oodnosnoconcocoDaDONODDODDOOUDOUOGO OS 69 ft HATCH DIAMETER: 2... ce ccc ccc emcee cc nincee 17.7 in.
BREAN rice ieicicieietietetalisrerererstassln) cictelelelslelel(sie)ofeiejel sie siels 13 ft EIBESSUPPORUs(MAX) 2) ape retells tele or-f-tac-1<)etaielarere 108 man-hr
PENGRIS sosdocecopdoogoDpU oO OOOO OD UDIOMOOROOD 26% ft MOMTMALIROWER 2) fictercieie cise: a) efelelcleier=!=)=1=)= =inln=inle 100 kWh
DIAVNFIT poodes copoGOuUDODROOOOUDO DODO OUOUOOS 17.1 ft SPEEDI(KNOTS)SICRUISE) qyaretretesete) eter) exenelon=F=\*1=, %/10 hr
WEIGHT (DRY) stecise erie cele ciel= wls's)=) 0 e)ere eel sin 61 tons (VO s co aauUtiGROnneDaac 2%/3 hr
OPERATING DEPTH: .......----eeeeeeseees 36,000 ft GREW = PEO MTS tie seietalels lel olelete tects /el/- Xe) alimKelaletalallat=i=[=i=) =] situ 1
COELEAPSE DEPTHS sia cievctete oie w= = wie oer eim ej ele 100,000 ft OBSERVERS bi vote stereteleferer-telelsfolel-tclel-¥elleloyalmletuiala’= 2
TBAVINGHIDATIE ) sicinic cleveiere lores lave) eine) ss) ale) s\e]eleleleie 1961 PANE OA Diiiicteretelalalslcliolalsicieleteleleltalet-telet-s-)etsneistiate 6,000 Ib

PRESSURE HULL: Spherical shape. Two, bolted hemispheres of Ni-Cr-Mo steel 5.9 in. thick, 6-ft 7-in. 1D. Total weight is approximately 15 tons.
BALLAST/BUOYANCY: Positive buoyancy is provided by 45,000 gal of hexane within a thin, iron alloy float. Iron shot (16% tons) is released to
ascend. A 26-ft-long, 132-Ib cable is dragged on the bottom for fine buoyancy control.

PROPULSION/CONTROL: Main propulsion is from a reversible, 20-hp motor. A horizontal and vertical thruster of 5 hp each are mounted forward
and topside, respectively.

TRIM: No systems available.

POWER SOURCE: Lead-acid batteries, externally located: Two 24-V, 160-amp-hr; one 28-V, 52-amp-hr; one 110-V, 860-amp-hr.

LIFE SUPPORT: Four QO, tanks at 150 kg/cm? pressure. CO2 removed by two soda lime cannisters. Silica gel used to reduce humidity.

VIEWING: Three plastic viewports. One is on the longitudinal plane of symmetry; two are on each side and look forward and down at 20° from the
horizontal. Viewports are 44 mm thick, 110-mm OD, 21-mm ID. A binocular telescope in each viewport produces a 58° field of view.

OPERATING/SCIENTIFIC EQUIPMENT: Vertical/horizontal speed monitor, deep (O—36,000 ft) and shallow (O—1,200 ft) echo sounders, obstacle
avoidance sonar, UQC, TV, three 35-mm still cameras, temperature (water) sensor, gyrocompass, sound velocimeter, PH meter, differential pressure
gage. Environmental data is recorded on magnetic tape at 10-sec intervals.

MANIPULATORS: One mounted forward of the pressure sphere capable of 5-ft extension, 200-Ib lift.

SAFETY FEATURES: Iron shot automatically dropped in the event of power failure. An extra 5.5 tons of iron/lead ballast is carried which may be
dropped to compensate for leak in sphere or in largest hexane tank, Closed circuit O2 rebreathers are carried for each Occupant of sphere.

SURFACE SUPPORT: Towed to dive site.
OWNER: Owned by French Navy, operated by Centre National Pour L’Exploitation des Oceans (CNEXO), Toulon.

BUILDER: Frency Navy.
REMARKS: Operational. This is presently the world’s deepest-diving vehicle.

95

ARGY RONETE

MEINISGRER eoboat coos nonennecoononodoosdDpooOs 27.8 m AVA OWA IETNSIRIS a eccoosootceconcesooouoes 1.2m
BEA Wistravetsterereieyeteneitatstoneyieteseferet tenets tetelsnetetaratetels het 6.8 m EIR EISUPPO Rig (MAD) iercrtetetsieislelisteicisienet: 1,920 man-hr
LEN IM ssernecgandcbahecansacduscooooaspocH ods 8.5m TROL NE IMOVMEIRS sonpacposeeeeooncasosnso0a 1,200 kWh
DIRVNFTIS cancoconcoognbogNodOCOoOoOddoOdTOSbanO" NA SPEED (KNOMS) RC RUNS Een pajeietetatateleiatstaiar ier nets NA
VilelKete nr (inven, sh acocopnoncoohonooaods 282.2 tons WARS con ooDnmaoeoooodudneassoogsgd 4
OREBAMING DERI Ss ieretevelatarclenetsisnsiecaveloiereleteratens 1,970 ft (SSB IPNILOMS GaconnodooboonOdoDoGoosdooGOonooKeD 4
(cfoyLPWANFQYS PIR URE sognocdtaonbonoetoonoode 3,800 ft ODSSWISEEY Gasoooneacuascotordonconcooone 6
EAGNC HID Am Ee ectehetetelelel aisteletst- lated ele lstel=t- Not completed FEN ALOVNOR oc hocoggeonvoncagessosgdnagcooe ands NA

PRESSURE HULL: Two cylindrical hulls with hemispherical endcaps; one for atmospheric pressure, one for ambient pressure. Both hulls are made
of 30-mm-thick, high yield-strength (SMR-type) steel. Atmospheric hull is 16.2 m long, 3.7-m diam.; ambient pressure hull is 5 m long, 2.5-m diam.
Hulls are linked by two spherical lock-out chambers 1.50-m diam.

BALLAST/BUOYANCY: Two 1,250-I-capacity tanks forward and two 1,650-I tanks aft supply main ballast. Two tanks of 1,120-! capacity for trim
and two tanks of 1,500-I capacity for equalizing submersible displacement when carrying extra equipment.

PROPULSION/CONTROL: Surface and submerged propulsion is supplied by two Kort nozzles each driven by a hydraulic pump supplying 75 hp at
330 rpm. The nozzles rotate around a vertical shaft and facilitate normal underway maneuvering. Slow speed maneuvering is attained by fore- and
aft-mounted vertical and horizontal thrusters.

TRIM: No systems available.

POWER SOURCE: Surface power is supplied by a 225-hp diesel engine which accuates a 30-kW, 120-VDC auxiliary generator for shipboard power
and a 72-kW, 80-120-V generator to recharge batteries. Oil-immersed, pressure-compensated, lead-acid batteries (60 ea.) of Fulmen type-L cells
supply 10,000 amp-hr.

LIFE SUPPORT: External to the hull are the following at 250 bars pressure: Fourteen 330-| air cylinders, fourteen 330-1 O cylinders; thirteen
330-1 He cylinders; one 330-1 He-O9 cylinder. A total of 3,500 | of fresh water can be carried in the submarine; 400 | in the underwater house. Food
is prepared aboard in the main hull and can be transferred to the aft hull. A hookah system can supply air to divers.

VIEWING: Several viewports located in both passenger and diver hulls.
OPERATING/SCIENTIFIC EQUIPMENT: UQC, echo sounder, diver lock-out capability, TV cameras.
MANIPULATORS: None.

SAFETY FEATURES: A releasable steel sphere (2.25-m diam., 20 mm thick) above main hatch can carry entire crew to surface. Crew can depart
vehicle through lock-out.

SURFACE/SHORE SUPPORT: Diesel/electric motors provide independent operations to a range of 400 nautical miles.
OWNER: Centre National pour I’'Exploitation des Oceans/Institut Francais du Petrole.

BUILDER: Centre D’Etudes Marine Avancees, Marseilles.

REMARKS: Construction halted in 1971.

EMERGENCY ESCAPE SPHERE

ENGINE ROOM OBSERVATION POST
OCEANOGRAPHERS’ WORK AREA
WARD ROOM
DRY CHAMBER BALLAST TANKS

LATERAL THRUSTER

HABITAT/DECOMPRESSION CHAMBER
ELECTRICAL CONTROLS
DIVING COMPARTMENT

GENERATORS

MAIN PROPULSION

DIESEL ENGINE ELECTRIC PROPULSION MOTORS AIR CONDITIONING SYSTEM

TRANSFER AND LOOKOUT CHAMBER CENTRAL COMMAND STATION

96

ARIES |

MENG oie foes wiellenele lolletelelnite l= !=ialntmlaln isle ieiis (ols ielelen= 25 1/3 ft VAIS IVA MENA sanbabioodconponconDGDDGGD 19 in.
[SNM conccthoosaupocatddoudogooOnDUOnGO 12 ft, 1 in. RIEESSURPOR aM AX) ameleta(etereleketelskelefetanelerelal= 108 man-hr
(RISK hrS cosesaodococonoonUoUDOnooNoOUOD GOOD. 10 ft THORNE ROMER sonéodoosocoounnUDoDodnoouse 60 kWh
DIGVNAUY cocovoocouscuboouDoronpoonenDOonooa ocd 8 ft SPEEDMICNOMS) CRUISER crareleiayeloueicr-iayeleiatelelencerarere NA
Wiser (ESA dososodponacouDODcomodoodooG 14 tons WS agodaoccoanonpanpoDoSDdooOeD 3
OBERATIN GIDEPSUEs fe aiopereielal« ele «) el» ele! .0\lei(nileltat=t= 1,200 ft CAWAWS LILCHRS Gocceaudonbordocdoosoodooponmas ced 2
COEEAPS EID ERM) erere isle lelteileil=i(-r lets salle) 'seielstellelivieliele =< NA CESERMEERS saoncocsoonancucudogcconbonod 4
L/NUINela YAMS qenAoooGouon aon do Under construction PEAWALEOUA Dra ack Ss crsincre cre chovene si Shaceucteue symle-elaneveiene 1,100 Ib

PRESSURE HULL: The pressure hull will be comprised of two basic elements; the submersible/diver command and control chamber, and the diver
lock-out chamber fabricated from A516 grade 70 steel. All penetrators will be monel faced or 316 stainless steel.

BALLAST/BUOYANCY: The ballast system is comprised of ‘‘soft’’ and ‘‘hard” ballast tanks. The soft tanks are fabricated from fiberglass and are
Open at the bottom and have mechanical vents at the top. The tanks are connected to a high pressure air system so that they can be blown. The hard
tanks are designed to withstand full diving depth and water is transferred between the tanks, and between the tanks and the sea by means Of a salt
water pump. The piping materials used in the system will be, in general, 316 stainless steel.

PROPULSION/CONTROL: Propulsion will be provided by three 5-hp thrusters mounted on each side and the stern of the submersible. The side
thrusters will be trainable not less than 120° vertical, and the sterm unit will be trainable not less than 90° port and starboard. The propulsion units
will be jettisonable. The thrust output will be varied by SCR controllers, which are, in turn, controlled by a throttle.

TRIM: NA.

POWER SOURCE: The energy source will comprise a 500-amp-hr battery. The cells will be connected so that the nominal voltage will be 120 V. The
battery will be located external to the command chamber in one oil-filled container.

LIFE SUPPORT: The life support system consists of two major elements: O2 supply and CO scrubber. The O2 system consists of two 70-SCF
(nominal) bottles, complete with pressure and flow regulators. The CO, removal system will consist of a motor blower assembly driving the
atmosphere in the chamber through LiOH cannisters or a refillable cannister of ‘‘Soda Sorb’’, or equivalent. Environment monitoring equipment
consists of a portable CO and Op, indicator, a barometer, thermometer and relative humidity gage.

VIEWING: One 39-in.-diam. plastic bow dome.

OPERATING/SCIENTIFIC EQUIPMENT: UQC, VHF FM radio, WESMAR scanning sonar, depth gage, compass.

MANIPULATORS: Three. One heavy duty and two for light work.

SAFETY FEATURES: The submersible will be fitted with a manually droppable weight, which will constitute the emergency ballast system. The
manipulator claws and thrusters will be jettisonable using a manually operated hydraulic system operated from within the command chamber.
Emergency breathing equipment will be provided in the form of self-contained rebreathers in the command sphere, Other emergency equipment
includes a 15-V nickel-cadmium battery for internal emergency power, six life vests, a dry chemical fire extinguisher, six standard flashlights and a
first aid kit.

SURFACE SUPPORT: soo.

OWNER: Soviet Academy of Science, Moscow.

BUILDER: International Hydrodynamics Ltd., Vancouver, B.C.

REMARKS: Two of the vehicles are reportedly under construction, The above description is taken from the initial design, the finished vehicle may
depart from this description.

SOFT TANK &
3 HIGH PR. AIR TANKS

2 RETRACTABLE LIGHTS VENT VALVE
SIDE THRUSTER

VENT VALVE
LT SOFT TANK

MAIN PROPULSION

LOCK

ROTATABLE
THRUSTER

DIVER LOCKOUT

DIVER GAS
STORAGE

BALLAST TANK

LIGHT
HOSE STORAGE

SALT WATER
2 OXYGEN TANKS PUMP

DROPABLE BATTERY & SKID

LIGHT

ONE HEAVYDUTY MANIPULATOR
TWO MECHANICAL ARMS

97

PLEXIGLAS SAIL

SYNTATIC FOAM

LIGHT

SS
PRESSURE HULL

DROP BALLAST
MECHANISM

BATTERY
SKIDS (DROP BALLAST)

98

ASHERAH

BREN Glalisirtatefatefetetatet-telst-tel-P=jchen=/els)«)«lnie/eis/aleleveleleiel els 17 ft BAT CHIDIA MEME Riri teteteietatel<imr-telststelelehelahenofatetele 20 in.
BEANIE aoscoosoodococ cops ono como oODDOD GOD 8.6 ft EIRESUPBOR Ta MAX) tmstercrcdeversistereledsielstetesaisiers 48 man-hr
nlelKels hfs ooossoeonecaessosnons os Sooo sa oOo OOoO 7.5 ft TICHIANE LXOMMISIS Goat cod cacannoD copaboc acd 21.6 kWh
DIRVNFITS cosoedcodtéoosovoncpooosuaodeedopodeuod. NA SBREEDIIKNOMS)HGRUISE epeyenetectereresenetsteieteteisy =i 1/8 hr
(NER (DRIES cascacocaondos0oppOoDOoDODD 4.2 tons WARS. Go gonocpeoudos GonbouGT 3/1.5 hr
OMENS MSPs pascoosconocvpeoponmODdOOD 600 ft CREW ARIE ODS mr teletarclelstolefaketerci=! atalcllons¥eleleyiclstelsisterstenenaters 1
COLEEAPSRIDE RTE cmectelsvelalsielslelel ele iel sletelel= tice hase 1,200 ft OESERIMEER GH po oncnsdodondopocdsoonod ooDD-. 1
PAUWINGHIDATEcieraerecietere erereleieralsisnelaislelsceleileveseleveeie 1964 IPE WALLEY NDR Goccp co npoobacboonoooeooooeecudoOS 100 Ib

PRESSURE HULL: Spherical shape 5-ft 1D, 5/8 in. thick of A212 grade B mild steel (firebox quality).

BALLAST/BUOYANCY: Main ballast air tank of 50-Ib capacity provides surface buoyancy. Auxiliary ballast tank of 340-Ib capacity provides ine
buoyancy control submerged. High pressure air carried in external tanks (four tanks of 72 ft3 STP each) pressurized at 2,250 psi. Droppable skid of
330 Ib supplies additional emergency positive buoyancy.

PROPULSION/CONTROL: Two, infinitely variable, individually controlled 2-hp, side-mounted, rotatable and reversible thrusters.

TRIM: None.

POWER SOURCE: Externally-mounted, pressure-compensated, lead-acid batteries (Exide TSC-23-930) giving 930 amp-hr at 24 VDC.

LIFE SUPPORT: CO) scrubber with blower and gaseous O9 carried within the pressure hull.

VIEWING: Six viewports, 5-in. 1D; 9-in. OD, 2 in. thick and all are 90° truncated cones.

OPERATING/SCIENTIFIC EQUIPMENT: UQC, Magnesyn compass, Fathometer, speed indicator, directional sonar tracker, one TV camera, one
35-mm still camera,

MANIPULATORS: None.

SAFETY FEATURES: Manually releasable skids (300 Ib). High pressure air blow of auxiliary ballast tank. Pressure hull may be flooded for
emergency egress. Scuba regulators and mouthpiece tap main compressed air supply for emergency breathing.

SURFACE/SHORE SUPPORT: Soo.

OWNER: Technoceans, Inc., New York City.

BUILDER: General Dynamics, Electric Boat Div., Groton, Conn.
REMARKS: Inactive.

99

H

2a CGOOSSSSSSSOSSSOOS i

100

AUGUSTE PICCARD

PENG ooo repens ae ne cine o wie lve «vs o velvieise nas 93.5 ft HAT CHIDVAMEME Ristrerncraterstsietereteletersterclst-xensiek-nets 30.1 in.
BEAM cietetelafelotelel-far-)-lciall-l=talislojelal=lelefejelsisielsielsleiaie\s 19.7 ft EIEEISURPORT (MAX) ci vere renoveteratolaielsielstelste)s 2,112 man-hr
HEIGHT 7-7-7. siejclel=\eleiels\eisiefsieleiels 24 ft MOMALIE OWE Remicverclavatoleleta total slstelel'sialelsiefal=\ajaielane 625 kWh
DRAFT: 11.9 ft SPEED (KNOTS) CRUISE M fisierelele clei fol olofaneyeverererote 6/10 hr
WEIGHits (DR) cireieict-ietetele e106 185.2 tons WARS Soncoclo oodooodecesnoCoDe 6.3/7 hr
OPERATING DEPTH: 2,500 ft CREW BENE OMS i eteneletotetetereVelote) siotcielsitelot=felistatstaVelielsiel sl =tale a
COLLAPSE DEPTH: 4,500 ft OBSERVERS meteretersteloielciol-deletetelstcieletereterie terete 40
EAUNCH DATES <2. ccc ccc cine cvcencevcceses 1963 YAO SeonsoonoddousondonhonGoosoodons 10 tons

PRESSURE HULL: Cylindrical shape of ‘“VOEST” steel quality Aldur 55/68 for cylinder and Aldur 55 for the two hemispherical endcaps. Cylinder
is 1.5 in. thick, 10.25-ft OD and 59.7 ft long. Endcaps are the same dimensions and equal to radius of the cylinder. Two hatch openings fore and aft.

BALLAST/BUOYANCY: External to the hull in two rows port and starboard are 12 steel ballast tanks of total volume 842 ft3 which supply 12.5%
(23.8 tons) positive buoyancy. Three compensating tanks are provided: two (9 ft3 ea.) are in the hull near the center of gravity and one (49 ft3) is
external to the hull, within the keel. On each side of the hull are four bins which hold 5.75 tons of iron shot electromagnetically released.

PROPULSION/CONTROL: An electric motor of 75 hp (1,500 rpm) drives a stern-mounted propeller. A directional Kort nozzle acts as the vehicles
rudder. Fore- and aft-mounted diving planes provide underway vertical control and stability.

TRIM: Two tanks forward and aft of 141 ft3 total capacity are used to trim the vehicle by transferring water fore or aft with an electric pump.

POWER SOURCE: Five lead-acid batteries within and on the bottom of the pressure hull are distributed as follows: two 110-V capacity,
2,000-amp-hr for propulsion; one 220-V, 700-amp-hr for lighting and pumps, one 12-V, 950-amp-hr for control instruments and emergency lighting,
and one 6-V, 700-amp-hr for safety ballast control.

LIFE SUPPORT: Normal dive of a few hours allows for breathing of ambient air inside vehicle at time of dive. For prolonged dives O04 is bled into
the hull and CO2 is removed by soda lime which assures a maximum of 2,112 man-hr.

VIEWING: Twenty viewports each on port and starboard side, and three in forward hemisphere. All viewports provide 90° of viewing and are 3 in.
thick, 12-in. OD and 6-in. ID.

OPERATING/SCIENTIFIC EQUIPMENT: TV on sail, compass, pressure depth gages/recorder, down-looking echo sounder.

MANIPULATORS: None.

SAFETY FEATURES: Iron shot ’’fail-safe’” droppable.

SURFACE/SHORE SUPPORT: Size and weight permit only towing to dive site or self-powered transit.

OWNER: Horton Maritime Explorations Ltd., North Vancouver, B.C.

BUILDER: Giovanola Freres, Monthey, Switzerland.

REMARKS: Undergoing refurbishment to conduct gravity and seismic surveys. Originally designated as PX-8.

101

PROPULSION MOTOR

\

FLOODABLE SAIL

VARIABLE BALLAST & TRIM TANKS

MANIPULATOR

\

TRIM TANK

TOOL RACK

HYD. PKG.
MATING SKIRT KG

102

BEAVER (ROUGHNECK)

LENSE Gogoepcce 26.3 ft HATCH) DIAMEME Ris eier. otetareterat- = oSconnorooOUDOOH 25 in.
BEAM cieierertci- te . 11.5 ft EVEESSUPPO Ritn( MAX) seurietererstelcietelerererereisic iene 360 man-hr
GBEIGHil ert 10.3 ft Wen LION Tae noon cos dopsoaronnoddonocGnss 44 kWh
DRAFT: .... . 6.6 ft SPEED (KNOTS): CRUISE : 2.5/8 hr

WEIGHT (DRY): ... ° 17 tons

OPERATING DEPTH: .... 2,000 ft CREW: PILOTS

COLLAPSE DEPTH: S00 a5 5 c 4,000 ft OBSERVERS poe 5 :
LAUNCH DATE: . eile lei niin elinielfelinis\mialeielie isle 1968 FPANALCYNER copoondécddgnonponceseadd

PRESSURE HULL: Two spheres joined by a cylindrical tunnel. All hull components are of HY-100 steel. The forward hull is 7-ft OD and 0.481 in.
thick with an overhead access hatch. The aft hull is 5.5-ft OD; 0.387 in. thick and has a diver lock-out hatch on the bottom. The connecting tunnel is
25-in. 1D; 71 in. long and 0.75 in. thick.

BALLAST/BUOYANCY: Main ballast is obtained from two 24-ft3-capacity (each) tanks mounted port and starboard. A variable ballast system
(combined with the trim system) is capable of obtaining neutral buoyancy within +1.5 ft by admitting or blowing seawater from two, port/starboard
spherical tanks. A hydraulically-driven stern winch carries 500 ft of cable to which an anchor may be attached (2,000-Ib capacity).
PROPULSION/CONTROL: Three 18-in. diam. propellers provide all propulsion. One thruster is mounted topside and the other two port and
starboard just below the centerline; all are driven by a 5-hp motor. The inverted “‘Y’’ configuration of the propellers and their control (360°
rotatable; reversible) allows six degrees of freedom maneuvering and hovering.

TRIM: Between three spherical tanks, one aft (1,238 Ib) and two amidships (943 Ib each), 1,474 Ib of water can be transferred in various
combinations to produce +30° pitch and +1 2° roll.

POWER SOURCE: Main power source is from pressure-compensated, lead-acid batteries which provide 30 kWh at 64 VDC to propulsion motors and
hydraulic motors, Auxiliary power is from pressure-compensated, lead-acid batteries which provide 14 kWh at 28 VDC to lights, vehicle controls,
electronics. Emergency batteries in the forward sphere are sealed, non-gassing, lead-acid and provide 24 V at 8 amp-hr to jettison squids.

LIFE SUPPORT: Both forward and aft pressure hulls have a life support capacity of 48 hr each. A self-contained automatic O2 supply is carried
within the hull and Baralyme and Purafil scrubbers remove CO). The aft sphere can be pressurized to a maximum depth of 1,000 ft, but cannot be
depressurized less than ambient pressure.

VIEWING: There are 11 acrylic plastic viewports, 1 in each of the 2 hatches and 9 in the forward pressure sphere. These nine ports are equipped
with blowers to prevent fogging. These ports have a 5.19-in. ID, an 8.75-in. OD, are 1.78 in. thick, and have a 70° field of view underwater. Of the
nine main viewports, five look ahead, down, and to the sides. These are the ports most commonly used during Oceanographic missions. The
remaining four ports look upward and are used primarily during work or inspection missions. The small port in the hatch of the forward sphere has a
2.19-in. 1D, a 3.65-in. OD, and a thickness of 0.73 in. The smallest port, located in the hatch of the after sphere, has a 1.115-in. ID, a 1.875-in. OD,
and is 0.38 in. thick,

OPERATING/SCIENTIFIC EQUIPMENT: UQC(8.087-kHz) Pan- & tiltmounted TV camera (W/90° pan), interior still camera synchronized
w/exterior strobe, sonar, gyrocompass, speedometer, depth gage, current meter (speed & direction) w/optional strip chart recorder,
upward/downward-looking sonar w/strip chart recorder, depth indicator w/visual or strip chart recorder readout, azimuth-scanning sonar w/CRT
readout, exterior-mounted 70-mm still camera, two 200-W-sec strobes, interior-mounted 16-mm cine camera w/400-ft capacity, 35-mm and 2%-in.2
still cameras, water sampler (sample is drawn directly into aft sphere).

MANIPULATORS: Each of the two manipulators has a 9-ft reach, eight degrees of freedom, and a 50-Ib lifting capacity. The two manipulators can
be equipped with nine different tools to perform various tasks. These tools are: impact wrench, hook hand, parallel jaws, cable cutter, stud gun,
centrifugal pump, grapple, drill chuck, and tapping chuck. Rates of motion are variable.

SAFETY FEATURES: Non-combustible or slow-burning material within pressure hull, external fittings for gas replenishment. The following is
jettisonable by emergency electrical power: Propellers (40 Ib each); manipulators (150 Ib each); pan/tilt lights, camera and current sensor (155 Ib
total), anchor (100 Ib) and main battery (2,532 Ib). Emergency battery, breathing systems and seawater actuated flashlights, pinger, marker buoy
with dye and recovery attachment, flares. Personnel may lock-out.

SURFACE SUPPORT: Soo.

OWNER: International Underwater Contractors, New York.

BUILDER: North American Rockwell Corp., Seal Beach, California.

REMARKS: Operational. The above description is as the vehicle was originally built.

103

RADIO ANTENNA

ACCESS COLD CANISTER RELEASE TV CAMERA
REAR AIR LOCK CONTROL
HATCH WATER

CONSOLE

SCIENTIFIC
CONTROL
CENTER

AFT
TRIM Ss sea
TANK

FORWARD
TRIM
TANK

SHOWER
BIOLOGICAL
SAMPLER BATTERY-OIL BATTERIES
RESERVOIRS

UNDERWATER

TELEPHONE
PROPULSION MOTOR

104

BEN FRANKLIN

LISI CHAE oooh ounoboo bo coo Do oOO oO UCSC OOOO HOD YMRS OIVN VISAS sooonohounccoposoondocdde 30 in.
BRAM a icriicce cuersharecetecencroniocers LIFE SUPPORT (MAX): 252 man-days
BERG Hilistetctsrane MOMACROWER Seyeicisteletets store oie
WEIGHT (DRY): SPEEDIIKNOTS) CRUISE M@ icitctetshelelaicisic nisielot-tlcierel stone 7435)
OPERATING DEPTH: WWYS oooocoodsoosoncapsobooneops 4
COLLAPSE DEPTH: 4,000 ft CREW sR POMS mrerepetsyebelsbalciokelctorel oterclel crcl apoactel=telet-Kelcireslaite 2
EAUNGHIDATIE SI eo arareten sts ateisleleislelelelelelelelie)e) >) «ele « s/s) 1968 CXS SRWASEE) ahoononudonpoccoucaacnddoduGuoC 4
PAYA OA Dera terebieierskenehcnetelisiorelelhetele tela ters tetoheVernielt= 5 tons

PRESSURE HULL: Cylindrical shape with hemispherical endcaps: OD 10.33 ft, length 48 ft. Hull material is 1-3/8-in. thick Aldur steel; hemi-heads
of Welmonil steel of same thickness. Box ring frames 6.3 in. and 5.7 in. deep are spaced 27.5 in. apart to act as internal stiffeners. Twenty-nine
viewports penetrate the hull (two of these are in the hatches). A 5.5-in.-diam. lock-out chamber (SAS) penetrates the hull topside amidships. The
hull consists of two asymmetric sections bolted together.

BALLAST/BUOYANCY: Main ballast is provided by four fiberglass tanks, two on each side of the hull, of approximately 650-ft3 capacity (48,600
Ib). Variable ballast for depth control is provided by two pressure-resistant steel tanks in the lower keel section which hold 110 ft3 of water each
(6,800 Ib). Emergency ballast is 6 tons of iron shot stored in bins between the main ballast tanks. This shot is electromagnetically held and can be
dumped as desired. Additionally, a door on the bottom of each bin can be manually opened, totally independent of the electric power.
PROPULSION/CONTROL: Propulsion is derived from four-25-hp pressure-compensated, fresh water-filled, 22-V, 3-phase, 50-Hz units
manufactured by Pleuger. The four motors can be rotated 360° in the vertical and can be fully reversed. Two rudders are located aft and are
electrically controlled and can rotate 30° to each side. By applying reverse thrust on the port motors and forward thrust on the starboard motors or
vice versa the vehicle can turn in its own length.

TRIM: Trim is controlled by transferring water between two tanks located at each extreme end of the hull. The tanks are made of steel and hold 50
ft3 of water each (3,100 Ib). The tanks are connected by an overhead vent line in the hull and by transfer pipes beneath the deck. The pilot
controls two electric pumps which transfer the water at a rate of 1,000 Ib/min. The system can obtain a bow angle of +1 om

POWER SOURCE: Power is supplied by 378 lead-acid batteries divided into 4 banks: six-56-V strings & four-28-V strings. An emergency system in
the hull consists of fourteen-2-V cells of 192-amp-hr capacity. Two static inverters of 336 VDC power the four main motors; two inverters convert
168 VDC to 115-VAC for the pod positioning motors. The main inverters are 3-phase and can be varied from 50 Hz at 70 VAC to 50 Hz at 220
VAC.

LIFE SUPPORT: A total! of 922 Ib of liquid O2 is carried. LiOH panels containing activated charcoal are used to remove CO> by natural convection
currents in the hull. An active odor removal unit consisting of a chemical absorbing section and a catalytic burning section is used to neutralize
contaminants not removed by the charcoal. Contaminant levels are determined by Drager gas detector tubes. A manually-operated head macerates
metabolic waste products and chemically treats and stores them onboard in six tanks of 6,000-Ib capacity. A total 4,600 Ib of potable water is
carried, 1,600 Ib are carried in super insulated tanks at 210°F and are used to reconstitute freeze-dried food.

VIEWING: Twenty-nine viewports are located throughout the vehicle; they are 6-in. 1D, 12-in. OD and 3 in. thick and provide a 90° field of vision.
A smaller viewport is located topside within a hatch of the SAS.

OPERATING/SCIENTIFIC EQUIPMENT: UQC (8-10 kHz) magnetic compass, directional gyro, turn/bank indicator, water temperature sensors,
depth sensor-recorder gage, CTFM sonar, down/forward Fathometer, tracking pinger, two TV's.

MANIPULATORS: None.

SAFETY FEATURES: Droppable ballast of 5 tons. Blowing main and variable ballast provides 41,000 Ib of lift. Emergency breathing system of 4-hr
duration each is obtained through a set of six Drager mixed gas (He/O2) diving apparatus. Flooding of the hull and escape through an aft trunk is
possible. Fire extinguishers, flashlights, life raft, releasable buoy, xenon light.

SURFACE/SUPPORT: Towed or self-powered.

OWNER: Horton Maritime Exploration Ltd., Vancouver, B.C.

BUILDER: Grumman Aerospace Corp., Bethpage, New York.

REMARKS: Not operating. Originally designed as PX-15.

105

106

HENSUIAE copssnsonescconsapooodoeconoosoOoD 11.3 ft
BENE. oogsoncAponoonossoo noo oO Uoe DOOD O UO 8 ft
PISKHATe so opeodd dbo ddondo ao odU DU oeUD CURE oiG 6 ft
DIVNTUic oooosonoDoboscoLbs POODDOeeonOe DOO Oe 4.5 ft
WMEKCInHr (OURNOS ssdosocooacnuopsoUDooDdGbGd 2.1 tons
OVASRYAUUINIS DIS Pine coccdoudscssuagonedoocUKG 600 ft
(COLIL/AESTS ISP sonscogubsocaussodgEbeo8 1,200 ft
UNUINTS FI OYNUIIES soo gaodgocsono tse csGse5ouonEeau 1963

PRESSURE HULL: Spherical! shape of A-285-C steel 60-in. |D and 0.625 in. thick.

BENTHOS V

ATIC HID UA MEME Rictseere:-netetelicneratepeteierstatet-potetertonetane 19 in.
PIRESSUPPO Rin(MAX) cia cepetetstercietsceheistertstenersiet= 96 man-hr
TRON LIFOMMES coco nccnonnponcomounooeSoncados NA
SEEEDIIRNOTS) ACRUONS Ee teectera lteter ieieralsietetetet ties 1/16 hr
Wes GonossedmoonoocodaconoDN 3/4 hr

CREWE ILE OMS tee reteteneietodaiteletet-inl'al ote !-lopatel cies l= issaletoratoher elec 1
OBSERMERS ta ayevateterel sl scetciatareistenonetterstttetetststenais 1

PUAN LOVN DS ooosgnecdoouscdbogsuasopesonsooss 400 Ib

BALLAST/BUOYANCY: Two separate 2,250 psi air systems. Within the hull are two variable ballast tanks to attain fine buoyancy control. An
auxiliary ballast tank is mounted aft and a bow buoyancy tank is forward. Droppable lead ballast.

PROPULSION/CONTROL: All maneuvering is provided by two 1-hp, 24-VDC, motors mounted port and starboard amidships that rotate 180° in

the vertical.

TRIM: The forward and aft buoyancy tanks may be differentially filled to attain up/down bow angles.
POWER SOURCE: Three nickel-cadmium batteries supply 80 amp-hr each and are carried within the pressure hull.

LIFE SUPPORT: NA.

VIEWING: Six viewports. Four look forward above centerline about the horizontal axis and two look down and forward. All are 6-in. diam. and 2

in. thick.

OPERATING/SCIENTIFIC EQUIPMENT: Compass, Fathometer, directional gyro.

MANIPULATORS: None.

SAFETY FEATURES: Droppable iead ballast. All ballast tanks can be blown at operating depth with emergency system.

SURFACE/SUPPORT: Soo.

OWNER: Garrison 8 Divers Corp., Seattle, Washington.
BUILDER: Lear Siegler, Inc., Deep River, Conn.
REMARKS: Not operating.

107

i
14
i
:
-

©

MAGNESYN INNER COMPARTMENT
COMPASS HATCH
180° MAIN MOTOR HOUSING MEDICAL
ASSEMBLY LOCK

CONNING TOWER

OXYGEN TANKS

360° BOW
THRUSTER

VERTICAL STERN

THRUSTER HIGH PRESSURE AIR

BATTERY POD

STERN THRUSTER

STABILIZER MOTOR

GAS STORAGE SPHERE

DIVER EGRESS HATCH

108

DEEP DIVER

WANE saacacosenssosacpeoos cng oos Gonsbemas rip HAT CHIDIAMEMR ER fi crc ereletarellels)clelener See vs anes SIN.
BEAM ciieieverereieuenerel=ieicieieyeloteFelaleieiatel= sbnvetieiavedarehagenaralene tt LIFE SUPPORT (MAX): ...... ePetaPsisRon telat siefeella 32 man-hr
RISIGIRINE oconsooKeos 55 a ooo 0K 8.5 ft TOTAL THOS aooseondotocnoongondoa gonad - 23 kWh
PIVNAIH cobaoasece 6.5 ft SPEEDHIKNOMS) CRUISE Marcraie eretoleielolelclielerelerer siecle 2/4 hr
WELGHinl(DRING) sircienerton tals . 8.25 tons APS CO GOO ROD RObAG bh ood oto 3/0.5 hr
OPERATING DEPTH: .... -+ 1,350 ft; lock-out 1,250 ft CMEKRINLOUS vdopotaveoectoosh dou sopnosocononoE 1
COLLAPSE DEPTH: ..... 2,000 ft OBSERVERS ofaliel ain feeyat's Soupoase 6
LAUNCH DATE: ....... =) 1968 PENIHOVNDR eroacadoobconeson0ocd SOOO OOOO 1,500 Ib

PRESSURE HULL: Forward hull, forward endcap, and diver’s compartment are made of 0.5-in. rolled and welded T-1 steel. Forward compartment
and diver’s cell are 54 in, thick. The transition shelf, connecting pilots and diver’s compartment is 5/g in. SA 212 grade B steel, 55-in. OD, which is
welded directly to the diver’s compartment. Conning tower is 28-in. OD made of 3/g in. thick T-1 steel which increases to 0.5 in. at hull intersection.
Conning tower is 19 in. above top of hull. All hatches are of cast almag 35 and are impregnated.

BALLAST/BUOYANCY: Main ballast tanks of 24.2-ft3 (845 |b) capacity are located port and starboard of the forward hull adjacent to the conning
tower and are made of 11-gage mild steel. The trim tanks may also serve as buoyancy control and hold 676 Ib of seawater. The battery pod adds an
additional 1,500 Ib of negative buoyancy which can be dropped in an emergency. The ballast tank vent valves are Operated by a reach rod that
Penetrates the pressure hull.

PROPULSION/CONTROL: Main propulsion is a G.E. 10-hp, 1,150-rpm, 240-V, 48-amp motor contained in a pressure-compensated housing and is
Pivoted to swing 90° each side of dead center. A stern thruster, consisting of two right-handed propellers turning On a single 1-in. stainless steel shaft
and driven by a 3-hp, 1,140-rpm, 120-V, 29-amp, DC, G.E. motor is mounted in a pressure-compensated container. This bow thruster is driven by a
G.E., 3-hp, 1,750-3,350-rpm, 120-V, 24-amp, DC motor which is shared with the trim tank pump and is mounted internally. The bow propulsion
unit may be rotated through 360° in the vertical Plane and serves as both horizontal and vertical thruster.

TRIM: Two tanks provide trim: One in the pilot’s compartment (365 Ib) and one in the diver’s compartment (375 Ib). The pilot’s tank is split into
six sections and is pumped dry. The diver’s trim tank is split into two sections and may be blown or pumped dry. The diver’s tank provides negative
buoyancy to partially compensate for the loss of weight when the divers leave the vehicle.

POWER SOURCE: The main power supply consists of four separate battery banks of thirty 12-V, lead-acid batteries, 92-amp-hr capacity each, at
20-hr rate which are contained at atmospheric pressure in a droppable pod suspended under the pilot’s compartment. The total water weight of the
0.5-in,-thick steel (SA 212 grade B) pod is 1,500 Ib.

LIFE SUPPORT: 02 is supplied from five bottles at 2,200 psi of 338-ft3 total capacity. Two bottles regularly supply the pilot’s compartment and
three supply the diver’s compartment, but provisions are made for any arrangement desired. The bottles are stored externally between the He sphere
and diver’s compartment. CO) is removed by two scrubbers of Baralyme, 6-lb capacity each, in the pilot’s compartment and one 12-Ib capacity
scrubber in the diver’s compartment. Two blowers, of 24 cfm, force air through the scrubbers; three 12-VDC fans help circulate air throughout. A
pre-mixed He-O2 supply can be stored in the 0.5-in.-thick, T-1 steel, 49-in. OD sphere. Two hookah hose adapters for divers working Outside are also
carried,

VIEWING: Twenty-one acrylic plastic viewports, 12 are double-acting and are 6-in. 1D, 8-in. OD and of 2-in. (external) and 1.75-in. (internal)
thickness. The nine single-acting viewports are 6-in. 1D, 8-in. OD and 0.5 in. thick.

MANIPULATORS: None.

SAFETY FEATURES: Main ballast and trim tanks can supply 845 Ib and 676 Ib of positive buoyancy when blown: a jettisoning battery pod
Provides 1,500 Ib of buoyancy. Emergency breathing can be through scuba regulators from the main air system or by breathing pre-mixed gas
through hookah rigs. By pressurizing the boat, escape is possible through the diver’s compartment. Flooding the boat allows escape through the
conning tower. Seawater-activated pinger, gas and electric power connections for supply from surface. Flares, life vests, anchor, dry chemical fire
extinguisher, external flashing light.

SURFACE SUPPORT: Submersible is air, ship or truck transportable. It can be towed by or carried on a ship during operations. A crew of five is
required for support of the submersible. The support ship must be a minimum of 100 ft LOA.

OWNER: Marine Sciences Ctr., Ft. Pierce, Fla.
BUILDER: Perry Submarine Builders, Riviera Beach, Fla.
REMARKS: Decommissioned. Donated to Smithsonian Inst. On display at Link Park, Ft. Pierce, Fla. Originally designated PLC-4.

109

FLOAT

NONROTATABLE
PERISCOPE

VHF ANTENNA

ENTRY HATCH

STABILIZER
MARKER FLOAT

LIGHTING ARM

PRESSURE
HULL

MOTOR

ELECTROMAGNETS

BATTERY POD BALLAST PLATES

BATTERIES

110

DEEP JEEP

TEE NGS oye oei core epee ohareie ies nln ninisie aisle esis isis sieve sie’s 10 ft HAT CHIDIAMEME Rismemereteretetateretetaletetstenererelateraf-tatatetavare 24 in.
BEAM iireretettetevelstelstelolYelelelsfelelsleitebslolelelejele) Selelsielelelelele 8.5 ft EVEREISUPRPORM(IMAX) si verelelotelatelefaleielelelelelehele tells 104 man-hr
HSIN copponoboodoooD OC DDUDUODUODO OD UG ODDO UOE 8 ft MOMALIPOW E Rcabarcaretelokelslehelolclotelshcleleieial=iulelelstelot=tetat= 7 kWh
PIsV Nalin ooOODN DO OOD OOODDO OOO OOnDODODOUOOUOUDOD 7.75 ft SREEDI(KNOMS) 7 CRUIS Eagceeteterstatatelek-felcroreietarererevetere 1/5 hr
(MEK (OGRE concosscoogssapccodedbODbODGOUC 4 tons MASK ei orte: cholololelolelelevehelolele lois) olereveten= 2/2 hr
ORERATUINGI DEPTH cimecatctatel<ratet als} ola <folet=hela sella <Velels 2,000 ft CREWAPI POMS rereleteteletenel stclalekeratoterel ket oleveValefelsteretclereveherate 1
COPEARS EIDE PG tmmarstapeveten-yoketay-tete?-fatiet-fevetatetaralcliol< 5,250 ft OBSERVERS tietererclererelerelotetehaleteneletajeferatslcnareletaretanena 1
LAUNCH DATE: .....2--.0025ccncenccrcersercees 1964 RANIEOA D cimreteiercyatsteteteratelalelenalelietelelelobetetot-feleret-i-felaiey= 200 Ib

PRESSURE HULL: Spherical shape of A-225-B steel 0.85 in. thick and 5-ft ID.

BALLAST/BUOYANCY: Positive buoyancy provided by the pressure hull and an epoxy resin float embedded with glass microballoons
(20-100-micron diam.) producing an overall density of 37 Ib/ft3. Negative buoyancy is obtained by thirty-4-Ib steel plates surrounding the battery
pod which may be electromagnetically released individually. Two toroidal tanks (free flooding) provide an additional 500 Ib of negative buoyancy.

PROPULSION/CONTROL: Propulsion is obtained by two port/starboard 0.75-hp electric motors which drive a 12-in.-diam. propeller. The motors
can pivot simultaneously through 180° of arc, are reversible and have variable speed. A vertical fin atop the aft end of the float acts as an underway
stabilizer.

TRIM: No systems required.

POWER SOURCE: Eight 6-V, pressure-compensated, lead-acid batteries mounted below the pressure hull supply all power.

LIFE SUPPORT: Compressed 02 is dispensed through a hospital-type flowmeter and circulated by an electric fan. CO2 is removed by trays of soda
lime which also contain a desiccant (silica gel) to reduce humidity. CO2 and O2 are periodically measured.

VIEWING: One acrylic plastic viewport 5-in. OD and 2 in. thick. Monocular viewing scopes (one/occupant) allow synoptic viewing through 40°.
OPERATING/SCIENTIFIC EQUIPMENT: UCC, horizontal and vertical avoidance sonars, depth gage.

MANIPULATORS: None.

SAFETY FEATURES: Droppable battery pod (560 Ib) and steel plates. Pressure hull may be flooded to 600-ft depth for emergency egress. Scuba
breathers can provide air for 50 hr. Two floats can be released which carry 3,000 ft of nylon line to the surface for subsequent attachment of a
rescue line to a clevis on the hull.

SURFACE/SHORE SUPPORT: soo.

OWNER: Scripps Institute of Oceanography, LaJolla, California.
BUILDER: U.S. Naval Ordnance Test Station, China Lake, California.
REMARKS: Not operating.

111

eee, —
LOCKWere |

\

SEEP gure,

HATCH

VARIABLE BALLAST
TANK

PAYLOAD
AREA

AFT TRIM TANK

FWD VERTICAL

AFT VERTICAL THRUSTER THRUSTER

SHOT HOPPER
PRESSURE HULL VIEW PORT

VIEW PORT

112

DEEP QUEST

LlsNehins csdodcocodossdcomd bo seeot OOpo 39 ft 11 3/4 in. HATCH DIAMETER: oc occ see ee eine ue we ce winnie 20 in.
BIEAMtiitotetetetetateeleictaletajerelalsleietel-i-fi=veseis)e/s/ele\niselelelulel« 19 ft EIRESUPPOR MT (MAX) Fi etic) elcteteteletereterelateietal=tereie 204 man-hr
FAESUG ai veterans teretete aveletataletalelsiehelint=ie)=re:s\e1\sie(8\s].e]le)s\e)s 13.25 ft MOMALE POWER EG) aie cic) cic winie w)eie ole)e civic civis sieie s 230 kWh
DIRNFAUIS aoocosenboononboODaOO UCD OUUnO UD ONO DOO 8.6 ft SREEDRIGNOMS) CRUISE renetclal ciel elsiciatsielelalslelattalellsl= 3/18 hr
WEIGHT (DRY) 2) co yo cecrein ore cree ee iwiwisicieie) oi minis) «0 52 tons MUA Xore tetera leterafetatalcfetetenaletarateleteraiaia 3/12 hr
OPERATING DEPTH: ......--- see eecc er eeceeee 8,000 ft CSS FILOUS csooopoospcsotocnscosdsdoobocuousAdD 2
COLLAPSE DEPTH: ....---ceee eee eee eee reeee 13,000 ft OBSERMER Stier. tate oleteleoneteleteteletateletatafal=Ualet-Pekalafels 2
LAUNCH DATE: .. 2.2.20 eee eee cee cece e eee ences 1967 PAYVIEOAD® 2 oi .c cleiee oe whe © 0 ei cl sien wieisisinis e'='s wleie oie 7,000 Ib

PRESSURE HULL: Bi-sphere shape, each sphere is 0.895 in. thick, 7-ft OD and made of 18% nickel, KSI grade, maraging steel. Spheres are welded
together and connection between the two is a 20-in.-diam. opening. Forward sphere contains three thru-hull penetrations: two are electrical
penetrations and one is the viewport. After sphere contains three reinforced welded inserts for the three access hatches.

BALLAST/BUOYANCY: Main ballast consists of four tanks mounted two on each side to provide a reserve buoyancy of 12%. A seawater variable
ballast system of two spherical tanks, 37-in.-diam., 200-KS!I grade maraging steel, one on each side, provides 1,828 Ib of ballast. A steel shot ballast
system (three separate tanks) supplies 1,700 Ib of ballast. Syntactic foam (36,000 Ib at 36 ocf ave. density) provides additional positive buoyancy.
PROPULSION/CONTROL: Forward and reverse thrust is from two, reversible, stern-mounted, 7.5-hp, AC, motor driven propellers. Vertical thrust
is from two fore- and aft-mounted, 7.5-hp, AC motors and ducted propellers. Lateral thrust is from fore- and aft-mounted water jets powered by two
7.5-hp, AC motors. A rudder and stern planes provide additional underway steering control.

TRIM: A 30° up or down bow angle can be produced by transferring 1,440 Ib of oil and mercury between two fore- and aft-mounted, 18-in.diam.,
spherical, steel tanks. A 10° port or starboard list can be attained by transfer of 828 Ib of mercury between two 15-in.-diam. tanks. Both trim and
list systems are pressure compensated.

POWER SOURCE: Main power is derived from two 115-VDC, pressure-compensated, lead-acid batteries mounted below and between the
bi-spheres. Two 23-VDC, silver-zinc batteries are carried in the pressure hull to provide 3.6 kWh of emergency power. Each main battery consists of
four 30-VDC, series-connected batteries composed of 16 Exide RSC lead-acid cells.

LIFE SUPPORT: Four 0.37-ft3-capacity tanks (2,250 psi) supply O for normal usage. CO is removed by blowing the air through LiOH/charcoal
cannisters. O7 level is automatically monitored and regulated. Emergency breathing is by four full-face masks connected to an oxygen- demand
system for survival periods of 12 man-hr. Temperature and humidity are automatically regulated.

VIEWING: Two acrylic plastic viewports are provided. One is located on the axis of the forward sphere and is a few degrees below the horizontal; it
is 3 in. thick, 9-in. OD, 3-in. 1D. The second is in the aft sphere and looks directly downward; it is 5 in. thick, 15-in. OD, 5-in. ID. The aft viewport is
equipped with an optical remote viewing system of 180° objective in the vertical and 360° in the horizontal.

OPERATING/SCIENTIFIC EQUIPMENT: UQC, gyrocompass, CTFM sonar, altitude/depth sonar, vehicle control computer, four TV cameras,
70-mm still camera/with strobe light, sediment corer, sediment vane shear device.

MANIPULATORS: Two manipulators mounted forward and capable of seven degrees of freedom.

SAFETY FEATURES: Emergency breathing apparatus. Emergency power within the pressure hull. Positive buoyancy can be obtained by
jettisoning: shot ballast (1,700 Ib), list mercury (800 Ib), trim mercury (1,250 Ib), main batteries (3,500 Ib) and manipulators (170 Ib).

SURFACE SUPPORT: Supported by a 100-ft (LOA), 40-ft beam, 395-ton, split stern ship using an elevator ramp for launch/retrieval. An operations
manager coordinates sub and ship operations at sea. Two pilots and 18 additional personnel onboard ship maintain and support at-sea operations.
Vehicle is air and semi-trailer transportable,

OWNER: Lockheed Missiles and Space Corp., Sunnyvale, California.

BUILDER: Lockheed Missiles and Space Corp., Sunnyvale, California.

REMARKS: Operational.

113

coe

me j
DEEPSTAR 2000

PINGER UNDERWATER PHONE THRUSTER

PRESSURE VERTICAL

THRUSTER INSTRUMENT

BROW

THRUSTER

STARBOARD
MAIN PRO-
PULSION

HARD BALLAST
TANK

SAMPLE BASKET
HARD BALLAST TANK EMERGENCY
ASCENT TANK

114

DEEPSTAR 2000

EIN Gib swtatalatateleketok-feletoyehometedetet=tet-sa ais! fivkelaltaiwisleieel etait 20 ft RATCHIDUAMEM ER iiieperetctetrefets rele) siclelatalsloceielsioteis 15.75 in.
BEA Miriiteton let eltatelensliote)isiis cejimteley site eislfel'=:=its]ni=\fe)=!.sl=i'-elaf,=\)=1=/e1i= 7.5 ft LIRESUPPOR Ts (MAX) ci creteteteieteievetst-tsteleletersnet ste 144 man-hr
REESE GA pee rated ata fesatnlafintaleve\elXelelieyelalelielelin)is\ells}ajle)e]eje)sile 0) )a\e 8.5 ft MOMMA OWE Ricietateteteteleteielelel-ttedotetelet-teh-t-i=l<tekatar 26.5 kWh
RYNFITS coggandcougocooOuUDObOUU CO oOUOOUO COGS 5 ft SREEDMKNOMS)MCRUIS El tertenaletellelsletel-feleletencKelereletei= 1/8 hr
WEIGHT (DRY): 8.75 tons WAYS SooadoneonapodoucdooonEoE 3/4 hr
CIHERYNTUMGIISPIT osooconconbondddgonoUndODG 2,000 ft (Hewes FUILOUS: scaosodoccoddcdpconeDoOGnduO0DnaDOD 1
COLREAPSEID ERM iircisveleistet=loiel=[elsrelsielei=\eel= 101-1 >\=10) = 4,130 ft OEOSERMERS cockscodospessnopacuscodeHoo DD 2
NUN ein eyNSs Goocosoocnoue GOUCONOCOUnOUCOU GOD 1969 PLN LOYNDR Soo sosbocoseno cone sccnuobnenogcoED 450 Ib

PRESSURE HULL: Cylindrical shape 5-ft OD with hemispherical endcaps. Hull thickness 0.75 in.; overall hull length 10 ft. Hull material HY-80
steel, Penetrations include three viewports, one hatch, seven mechanical and three electrical.

BALLAST/BUOYANCY: Main ballast system for surface buoyancy consists of flooded soft tanks blown dry with high pressure air. Tanks are an
integral part of the exostructure and fairing. Variable ballast system consists of four hard tanks and collapsible bladders. Oil is pumped from hard
tanks to bladders to increase displacement or reversed to decrease displacement. Permanently installed syntactic foam is used to Obtain submerged
neutral buoyancy.

PROPULSION/CONTROL: Two main propellers in the stern (5-hp ea.), reversible, servo-valve controlled, continuously variable. Two vertical
thrusters port and starboard, two horizontal thrusters fore and aft. All thrusters are powered by hydraulic motors driven off of the main hydraulic
Plant (two plants at 10-hp ea.). Each electric motor is pressure-compensated, 120-VDC, 7.5-hp.

TRIM: Hydraulic-activated drive moves batteries fore or aft allowing pitch angles of up to +25°.

POWER SOURCE: Lead-acid batteries; one 120-V, 150-amp-hr, two 28-V, 150-amp-hr, located externally and pressure-compensated. Selectively
droppable.

LIFE SUPPORT: Gaseous 02; two flasks of 840 in.3 each at 2,250 psi. Monitors for COz, O2, cabin pressure, temperature and humidity.
Emergency (three 1-hr) breathers. LiOH to remove CO).

VIEWING: Two, 4.5-in. 1D, of plastic looking 19° downward and slightly to port and starboard giving overlapping fields of view. One, 2-in. ID,
looking forward on centerline for still camera.

OPERATING/SCIENTIFIC EQUIPMENT: Sperry MK27 & repeater, FM radio, UQC, TV camera, alt/depth sonar, gyrocompass, pressure, depth,
rate and acceleration system, extendable light booms with up to 2,500 W of lights, xenon flasher, voice recorder, velocity sensor, temperature probe,
ambient light sensor, sound velocity sensor, subbottom profiler, side-looking sonar, still and cine cameras and sediment corers. Data logger for any
digital signal, 8-track.

MANIPULATORS: One with two degrees of freedom.

SAFETY FEATURES: Main ballast can be blown at operating depth (500-Ib lift). Mechanically jettiscnable high pressure Air Bottles (500 Ib).
Mechanically jettisonable batteries (1,250 Ib). Mechanically jettisonable payload brow (500 Ib). Emergency breathing, manipulator jettisonable, life
raft, flares, life jackets.

SURFACE/SUPPORT: soo.

OWNER: Westinghouse Ocean Research and Engineering Center, Annapolis, Md.

BUILDER: Westinghouse Electric Corp.

REMARKS: Operationally ready, but has not dived since 1972.

115

STARBOARD PROPULSION MOTOR

ACCESS HATCH
DC POWER DISTRIBUTION

FWD TRIM TANK
fy
taaN
DESCENT WEIGHT

BATTERIES
SYNTACTIC FOAM

—<—J PRESSURE HULL
DROPPABLE 3.5 LB. WEIGHTS

MANIPULATOR DEVICE
OBSERVERS COACH

116

DEEPSTAR 4000

EEN GilgtiteeeyateystatelialelelieteVeteh-t-lelfeye [el sf= ls felistefiela]rifslsiejeeiaieais 18 ft HAR CHIDTAMEME Ram aret-heleret-talatafot-telalatelat-teletaelet- 15.75 ink
BEAM iiatete ratte tististletistiati=1/-oltafnlieNelletelialiaiel|«liejieiam (ellolisl(elv[imielnjiei=linl« 11 ft LIFES SURO (KVR oppooppccocogsdacoos 144 man-hr
FRE Giles tevetoiatetede led elise tel ohepeVe peal t=l=1)ls)slelelisiaelleiaiel sin ieisieie 7 ft THOU LIFOMMERNS coscoososondpecdsanosssea5o4 49.6 kWh
DIRVNFUS coooscnpopoondnooDuooUpoouDOKdoOUG goo ue SEEEDM(KNOMS) CRU IS Es errerercheledtehotonetel-yehafarerelter= 1.5/6 hr
WEIGHT (DRY): 9 tons MAG iircretarelelehelefetoleleherelsiehelsltotalstelere 3/4 hr
OPERATING DEPTH: .........2--002 2s eeeenee 4,000 ft CREW: PIE OMS cree jesele lates) sila) isl slelelfviel}e) sca) m/s (en) ==1es-=is\lK~\ie]iei(e 1
GCOLEEAPSE DEPT occ e ie cieicinie ne wen tw ine 7,600 ft OBSERVERS Mi oirenct-tehclatetal-retcheyeh-lehatst=falel stare tatst atets 2
EAUNGCH DATE: 2.8 6 ee cee ewe e sce cnc ennsee 1965 BAWIEL OAD) teieyelelaicleire elotereteirel=ie/e)=csveusifelalisvs)'=[=[=\-Way=tnial= 450 Ib

PRESSURE HULL: The hull consists of a 78.75-in. OD, HY-80 steel sphere with 11 openings machined into the sphere. These include two
viewports, one camera port, one hatch, two electrical penetrations and five mechanical shaft feedthroughs.

BALLAST/BUOYANCY: Main ballast tanks are used for positive buoyancy on the surface. Negative buoyancy is decreased by dropping small
(3.4-Ib) trim weights. DEEPSTAR dives with a 220-Ib descent weight which is dropped as the vehicle nears the bottom. At the termination of a dive
the 187-Ib ascent weight is dropped allowing the vehicle to rise. A variable ballast system provides regulated increments of ballast change by transfer
of oil between hard tanks and flexible bladders; 4,500 Ib of syntactic foam (this has a density of 39 pcf) are installed to give neutral overall
buoyancy.

PROPULSION/CONTROL: Two fixed, reversible, 5-hp motors are mounted port and starboard just forward of amidships. The motors are variable
in speed from 30 to 900 rpm.

TRIM: Two pitch control cylinders mounted on the centerline, one forward and one aft, with hydraulically-activated pistons are used to transfer
225 Ib of mercury from one end of the boat to the other allowing pitch angles of up to +30°.

POWER SOURCE: Lead-acid battery, 124-VDC, 400-amp-hr. Three 2-V dry cells are carried for emergency operation of radio, flasher and UQC.
The lead-acid battery is carried externally and is pressure compensated,

LIFE SUPPORT: CO, is absorbed by blowing cabin air through LiOH granules then directing it downward across the viewports. O is supplied
through a flow-control valve from a high pressure gaseous O7 supply. A bypass valve allows manual control of O2 if flow regulation fails.

VIEWING: Two viewports provide overlapping coverage for the pilot and one observer. These ports are 21° below the horizontal centerline and 16°
Port and starboard of the vertical centerline. Each viewport is 3.9 in. thick with an ID of 4.33 in. and an OD of 11.1 in. The ports are equipped with
blowers to prevent fogging. There is also a smaller port located on the vertical centerline which is used exclusively for cine photography. This port is
1.51 in, thick with an ID of 1.69 in. and an OD of 3.32 in.

OPERATING/SCIENTIFIC EQUIPMENT: Gyrocompass, three sonar transducers (forward, downward, and upward-looking) with strip chart
recorder, depth sensor, depth monitor with interior dial readout, depth indicator, current meter (speed only), odometer, water temperature probe,
inclinometer, yaw indicator, 2-channel tape recorder, interior-mounted 16-mm cine camera (400-ft film capacity), exterior-mounted 70-mm still
camera with two strobes.

MANIPULATORS: One with three degrees of freedom,

SAFETY FEATURES: Releasable forward battery (600 Ib). Jettisonable manipulator. Mechanically releasable trim mercury (225 Ib), backed up by
3,000 psi N2 for angle jettison. Mechanically releasable ascent weight is 185 Ib (also released by an overdepth release). Small weight dropper rack
contains 150 Ib of weights which may be released hydraulically or mechanically. An overdepth release device, independent of the pilot and power
supplies, will release both descent and ascent weights if vehicle reaches 4,200 ft +3%.

SURFACE SUPPORT: DEEPSTAR has no permanent support ship, but is tended by a leased vessel. The last such ship was the M/V SEARCH TIDE
Owned by Tidewater Marine, New Orleans, La. SEARCH TIDE is a typical offshore supply boat, designed to service drilling rigs in the Gulf of
Mexico, SEARCH TIDE is 155 ft LOA with a beam of 36 ft and a draft of 11 ft. Her displacement is 199 tons. She is powered by two 1,000-hp
diesel engines giving a cruising speed of 12 knots and a range of 3,700 miles. Vans mounted on the deck provide living quarters, a machine shop,a
darkroom, and a maintenance shop for DEEPSTAR’s electronics,

OWNER: Westinghouse Ocean Research and Engineering Center, Annapolis, Md.

BUILDER: Westinghouse Electric Corp.

REMARKS: Not operating.

117

VARIABLE BALLAST
OIL RESERVOIR UHF RADIO

TRANSPONDER INTERROGATOR ANTENNA
Se SNR SS ELECTRICAL HULL PENETRATORS
UNDERWATER TELEPHONE
JUNCTION BOX DEPTH MAIN BALLAST TANK
SONAR SYNTACTIC FOAM
HYDRAULIC VALVES
FORWARD

AFT MERCURY MERCURY
TRIM TANK TRIM TANK
PROPULSION FORWARD

MOTOR LOOKING
SONAR

MOTION PICTURE
LIGHTS

HYDRAULIC POWER

VARIVEC

PROPELLER lig

if SUPPLY

70 MM STILL CAMERA
CONTROLLER Lids AF), :

Bea HP AIR
ACCESS PANEL ALTITUDE MANIPULATOR
SYNTACTIC FOAM SONAR 5 IN. DIA. VIEWPORTS P/S
VARIABLE BALLAST MAIN PRESSURE HULL
TANKS P/S (EIRM RETR 7 FT.OIN. ID.

118

DEEPSTAR 20000

LENGTH: .. 36 ft HAS CHIDVAMERTE Fiittitcte ccrelcterolstsltetalatralelaitsficiaieit=/aletafalelete 16 in.
BEAM: .... 10.25 ft EVRRESSUPPOIR TNA) Bip tapersreteney eter allaiciel ciel a\eer= 144 man hr
HEIGHT: NA TONE TOWER coodoconcancusoc0cononvcopoaDCNGadoS
DRAFT: NA SPEEDIUIKNOMS) 1 CRUISEms sr etetelateyotelster-t<iet-torekelelslakelst aioli 2
WEIEIshr WIENS oooosocdooncoponeoonodDDeDOd 42.5 tons WINS soanocdgoDODGOoscDOnOOdDOCOND 3
QOHERVMIING DERE oocsotengnacpcugcunoodoK 20,000 ft CREWE PILCHS: scoscoagcadc0so0arduCHdBOoodnoooeod 1
COLILUNESE DIEPIIRR occtccccgccconooncoGooDoDOODE NA OBSERVERS matepateretetetatatetetatedat= felt (erate Relstalelevelere ral 2
L/NUIN( ela PYNTHES Gecooncoondod (construction halted in 1970) HMNALCYNDS apacocccs 060Gb CUD DOC DO DOdCIGA 500-2,000 Ib

PRESSURE HULL: Spherical shape, 7-ft 1D composed of HY-140 steel and weighing 12,414 Ib.

BALLAST/BUOYANCY: Syntactic foam (42-pcf) permanently installed main ballast system uses 3,000-psi air to blow tanks dry and provide 6,800
Ib of surface buoyancy. Descent weight of 300 Ib dropped near the bottom provides neutral buoyancy. A bladder/hard tank system reduces
displacement proportional to depth to compensate for buoyancy gained by hull rigidity. A 500-Ib ascent weight is used to initiate ascent. The
bladder/hard tank air system is also used for +1,100-Ib changes utilizing a hydraulic pump.

PROPULSION/CONTROL: One 10-hp, AC motor drives a Varivec propeller mounted aft on centerline. One hydraulic pump driven by the same
motor provides hydraulic power for vehicle hydraulics underway.

TRIM: Mercury tanks fore and aft transfer 630 Ib of mercury to obtain pitch angles of +30°.

POWER SOURCES: 120-VDC, silver-zinc batteries are carried externally and are pressure compensated. One 29-VDC auxiliary battery and one
28-VDC emergency battery are carried in the pressure hull.

LIFE SUPPORT: Gaseous 0. LiOH to remove CO.

VIEWING: Two viewports, 4.5-in. ID, with overlapping field of view looking forward and down. One 2.25-in. 1D camera port on centerline looking
forward and down.

OPERATING/SCIENTIFIC EQUIPMENT: Tape recorder, FM radio, velocity indicator, transponder, 70-mm still camera, 16-mm cine camera, water
temperature sensor, side-looking sonar, two depth gages.

MANIPULATORS: NA.

SAFETY FEATURES: Surface lights, radio beacon.

SURFACE SUPPORT: NA.

OWNER: Westinghouse Ocean Research and Engineering Center, Annapolis, Md.
BUILDER: Westinghouse Electric Corp.

REMARKS: Major components completed and in storage; never assembled.

119

INCLINOMETER VIEWING DOME ELECTRICAL JUNCTION

BOX
LATERAL PROPELLER

ACCESS HATCH EXOSTRUCTURE

HIGH PRESSURE FRAMES VERTICAL LATERAL PROPULSION
AIR TANK PROPULSION MOTOR
MOTOR

EJECTABLE BUOYANCY
BLOCKS
SAVONIUS
ROTOR

BROW
RETAINING RINGS

SAIL

44%2"" DIA GLASS

PROPELLER
SHROUD wes
TITANIUM TRANSITION
FIXED BUOYANCY RING

MATERIAL

FORE AND AFT
PROPULSION MOTOR

BATTERY CABLES BLOW VALVE

| NECTS
AND DISC OMNES VERTICAL PROPULSION TUBE CYLINDRICAL BATTERY
HOUSING

HY 100 STEEL HULL

PRESSURE COMPENSATION
BELLOWS

CHECK VALVE AND
ACCUMULATOR

120

DEEP VIEW

LENGTH: FATIC HED TAMIESTIE FR 8 crerenetete tattle l>leielelevaleile lef = le=t=iaitmi= m= 20 in.
BEAMS cetera (LIFE SUARORANIOV OE “ogoocsoschubodonuosoo 38 man-hr
HEIGHT: TONNE IFONMEIRIG Goo nanoonnbespooodnHoenoooDtsse 16 kWh
DRAFT: SREEDIIRNOMS) Sater ctetereinienciccncietencrehetatolo tele issih ci otel« 1/12 hr
TENT PUES. 6 aio oboe SO OC EEOC DO Dito CrEe oie GEtORiS) I eee cchotterajelerevelictapaleve)s is! afsiete\erelaierele 2/6 hr
OPERATING DEPTH: TES5OOKt I fegetee ve lejeleisinbeleelslisiia\lel>]a sien. =\ate/= (at 4/2 hr
COLLAPSE DEPTH: 7,500 ft CUS RIFIECHS sasscoboccnccoccccosmonsepnDNU OOOO 1
BAUNGCEE DATES sie aroieio ciate « eien ein clele eles eels 0:0) < 01s\> 1971 (OTH SRWAEESY Sapbcdosoodcsessesceshennocosoc 1

PY NWWLCYNDS sash tesnesocsnoacHdobeseo 800 Ib (incl. crew)

PRESSURE HULL: Cylindrical shape with one hemisphere endcap of glass and one of steel. Hull material and one endcap is HY-100 steel
0.65-in.-thick. Ring stiffened cylindrical pressure hull 6 ft long, 44.5-in. diam. Glass endcap Is 1.25-in.-thick Borosilicate weighing 300 Ib.
BALLAST/BUOYANCY: Forty 5-Ilb steel plates provide slight buoyancy for initial descent and may be dropped individually during the dive to
attain positive buoyancy. Twenty 3-lb buoyancy blocks provide variable buoyancy and are ejectable to attain negative buoyancy.
PROPULSION/CONTROL: Five 5-hp, reversible MK 34 torpedo motors (DC). Two are mounted astern for forward and reverse propulsion, one is
mounted athwartships to provide lateral thrust, two are mounted amidships on each side to provide vertical thrust. Four degrees of freedom from
thrusters plus two degrees by internal ballast trim are attainable.

TRIM: Ballast plate drop or buoyancy block ejection for adjustment to buoyancy status. Internal movable ballast for pitch or (infrequently) roll
trim. Fore and aft ballast plate drop determines pitch/trim external.

POWER SOURCE: Sixteen 6-V, lead-acid batteries connected in series-parallel provide 12, 24 and 48 VDC at 220 amp-hr for main power.
Emergency power may be attained from eight 6-V, lead-acid batteries connected in series-parallel to provide 15 amp-hr at 24 VDC. Four auxiliary
batteries for switching and environmental control have 2.4-kWh capacity at 24 V.

LIFE SUPPORT: Two each, 18-ft3 tanks of 07; two each, 18 ft? tanks of scuba air. 02, CO7, H2O, and temperature monitored visually with
warning horns on O3 high and low and CO 3 high. Primary CO removal by LiOH, backed up with Baralyme.

VIEWING: Glass hemi-head provides panoramic viewing forward.

OPERATING/SCIENTIFIC EQUIPMENT: UQC (8.1-kHz) 4,000-yd range. Two depth gages, lights, echo sounder, VHF radio.

MANIPULATORS: None.

SAFETY FEATURES: Jettisonable battery pods and ballast plates. Access trunk can be blown for 100-gal displacement (855-lb buoyancy).
Emergency batteries internal. Redundancy of blow or pump for access trunk. Flood and go possible with portable scubas.

SURFACE/SHORE SUPPORT: soo.

OWNER/BUILDER: U.S. Naval Undersea Center, San Diego, California 92132.

REMARKS: Not operating. Certified to 100 ft. Now at Southwest Research Lab.

121

VERTICAL PROPULSION
MOTOR

PRECISION SONAR
TRANSDUCERS

INBOARD VERNIER TRIM TANK

LOAD SKIRT

MAIN BATTERIES MANIPULATORS

OPTICAL RELAY TUBE
BOTTOM SKI

122

DOWB

FEEN Gilittitiemegetetetione een atetistt ol -tefeustietiate‘etolel = sie (elfefis|=?=y=l=ini= 17 ft RUNG) VANIER: Gooonasocenbonanpoes bona GOD 20 in.
BEAM: THOooSocCHooS sonosUoOOUEO ORDO D OOO 8.75 ft CUIFHESUFFORI IVS soocngcbencccgcoanme 195 man-hr
RIESKEIRIES aoooo oe ooonossotesansoopooocesosooode 11.0 ft TROUZNGIAOMMERS: odocccpaddntcnocsdadosbescoean 40 kWh
EY RA alte tetenetet feted state tetteliatatstelfelistst a=) =li=f=lie=1/=\'= l= [i's] =//=0=/ial== 5.0 ft SPEED (KNOTS): CRUISE

VUNG (DEKE snpsonacoonspon boos soup oOOOOS 9.4 tons MWS Soonodnoodos

OMERVANIMING IDISIPUINE soncsoocnesoeensessosedns 6,500 ft CMEWRIFNKOUS socdotdhconuscdacs

(OWL/N ASS laine SongooupooapncoueodoonooG 10,000 ft OBSERVERS 990 300

LYN VIN (ela leYNILES sao seogcndcogcacocuodHbdSooomoOOO 1968 PYENALCYNDE soaccpodrdoncsusa0doSS

PRESSURE HULL: Spherical shape of HY-100 steel, 82-in. OD and 0.935 in. thick.

BALLAST/BUOYANCY: Two water ballast hard tanks are used to provide 3,330 Ib of positive buoyancy at the surface. The variable ballast trim
system is composed of a hard tank and gil-filled bladders. This system is used primarily to adjust for small changes in displacement, but can be used
to adjust for a difference of up to +2% in trim. This system can achieve a maximum of 512 Ib of positive or negative buoyancy. Shot ballast (900
Ib) is used for ascending and descending.

PROPULSION/CONTROL: Four ducted main propulsion motors provide four degrees of maneuvering freedom, these are: forward and reverse
thrust, vertical thrust and yaw. The two horizontal propulsion units are located port and starboard in the plane of the deck, canted outward at 15°.
The two vertical thrusters are located fore and aft with their axes normal to the plane of the deck. The propulsion motors deliver 2 SHP to
18-in.-diam. propellers at 486 rpm.

TRIM: By transferring oil (used to obtain fine buoyancy control) between fore and aft soft bladders, up/down bow angles of +2.5° may be
obtained.

POWER SOURCE: Twenty externally-mounted, pressure-compensated, 12-V, lead-acid batteries provide 43.2 kWh of 120 VDC. This voltage is
converted to 115 VAC, 60 Hz, single phase. One auxiliary battery (silver-zinc) provides 1.82 kWh of 30 VDC for emergency use and is located within
the pressure hull.

LIFE SUPPORT: O2 (160-scf) is carried within the pressure hull and operates together with the CO removal system which consists of a forced
ventilated scrubber stack containing 25 Ib of LiOH. Atmospheric monitoring is conducted continuously and automatically by an O2 concentration
indicator, a thermometer, a hydrometer and an aircraft altimeter.

VIEWING: Two optical ports located directly amidships and at the bow afford a total coverage of 360° through an internal periscope system. This
optical viewing system provides a full 4-pi solid angle visibility through 180°-wide-angle objectives mounted outboard of the viewports.
OPERATING/SCIENTIFIC EQUIPMENT: UQC, gyrocompass, scanning sonar, upward-looking and downward-looking Fathometers, closed circuit
TV (camera mounted on manipulator), video tape recorder.

MANIPULATORS: One manipulator possessing six degrees of freedom can pick up a 50-Ib load at its maximum reach of 49 in.

SAFETY FEATURES: Emergency breathing system consisting of closed circuit breathing connected to main O2/CO2 removal system. The
following components are droppable: shot ballast, batteries, pan and tilt mechanism.

SURFACE/SHORE SUPPORT: Was supported at sea by the R/V SWANN, a 135-ft (LOA), 250-ton displacement ex-U.S. Navy patrol craft.
OWNER: Santa Barbara City College, Santa Barbara, California.

BUILDER: A.C. Division, General Motors Corp., Santa Barbara, California.

REMARKS: Inactive. Used for student training.

123

VARIABLE BALLAST TANKS
TOPSIDE PAN UNITS

CONTROLLERSP &S

MAIN PROPULSION

BALLAST TANK
MAIN BATTERIES

TRIM TANK (RETRACTIBLE)
InipEOn LIST TANK MERCURY TRIM
CONTROLLER AIR TANKS P&S WANS
CONTROLLERS
TILTING hes
SHROUD \ | AL DD FWD THRUSTER
| 1 DUCTS
mS Cap
a | Op MAGNETIC
4 45 ANCHOR P &S
j CONTROLLER

AFT THRUSTER eave =
DUCTS
AFT DISTRIBUTION
HYDRAULIC BOX
POWER UNIT

TRANSFER TANK
AFT PAN & TILT MECHANISM

HYDRAULIC POWER UNIT

TRANSFER TRANSFER TANK
SRIBT FWD PAN & TILT UNIT
MERCURY
RESERVOIR CONTROLLERSP&S

FWD DISTRIBUTION BOX

MANIPULATOR

124

DSRV-1 & 2 (DEEP SUBMERGENCE RESCUE VEHICLE)

(Llexeninle cooopconcopcono ono Dpeobeod Gopeneono 49.3 ft FAC HID VA MERE Ri i eye teter tetera fake lene hel felon -leyotetsnat 25 in.
SIE/AME ceoeoonucs dovcéocsso6 neo oD oooUObdODUCOS 8.1 ft EIR ESUPPOR TAMA) rit tclerayeteretar-t-t-) bane i =trar ait = 729 man-hr
FREN GAB car eravatctiay <iniin) Slefiniie lier elepelisier =e) oleic el e.eieysjeisies) ss 11.4 ft TROUEN EI ROMMERS oonpcoanceoccodensuudoocnpodoS 58 kWh
EXEVACE ilistere eter tetatareielctel telat eilol rim) sialistioke)aiiers<slers\s! 9i=\=1=/=\~ 10.75 ft SPEEDHIRNOMS) CRUISE Nie crereteter a letetet=tetefel telnet eter 3/12 hr
With WON SocomoncooosoopcoDOGDOUDOOD 37.35 tons MA Xeon teicier vet ecclistey Nel tener -ccn ster her aire 4.5/3 hr
CMERVATMIING DIE IIS SopecdgosdgsoSc0geoeeooen 5,000 ft CREW EMO mietstetetatatelotelstslcteletetate-)-tetel-f-t-4-0-t ttt 3
GOEEAPSE DEPT occ cio sce cicie cise wine nie ee 7,500 ft G\EQSRWATRS chocogacsunecaon sess 24 (Rescuees)
EAUNGCHI DATES Siete i crere ele ote) s ols onic eee 1970 & 1971 HANALOCYNDI ss 5oondonbosso5posScnGescousaoods 4,320 Ib

PRESSURE HULL: Three 7.5-ft diam., 0.738-in.-thick, interconnected, HY-140 steel spheres contained within a formed fiberglass fairing. Forward
sphere is for operators; aft spheres are for rescuees (24 total). Two hatches are in mid-sphere; one topside is for surface access, one On bottom
enclosed by skirt is for rescuees to enter.

BALLAST/BUOYANCY: Four saddle tanks (748 gal—6,400 Ib total) provide freeboard on surface. Fore and aft tanks (123.4 gal—1,060 Ib total)
provide variable buoyancy control. Four collapsible bags in each sphere (478 gal—4,080 |b total) compensate for weight of rescuees. Fore and aft
tanks (713.6 gal—5,664 Ib total) are used to store water pumped from rescue skirt.

PROPULSION/CONTROL: Forward propulsion by a stern-mounted, reversible 4-ft diam. propeller driven by a 15-hp, AC motor. Two each vertical
and horizontal ducted thrusters (fore- & aft-mounted), each driven by a 7.5-hp, AC, electric motor. Shroud around stern propeller can be tilted to
control yaw and pitch.

TRIM: Up and down bow angles can be obtained by transferring part of the 1,428 lb of mercury carried in forward/aft tanks (36.5 gal total). Port
and starboard tanks located above centerline provide list control by transferring 6 gal of mercury (440 Ib). A similar tank located low on the
centerline amidships can control BG by mercury transfer from list tanks.

POWER SOURCE: Two pressure-compensated, silver-zinc batteries weighing 2,000 Ib each supply 56 kWh apiece at 112 VDC for main propulsion.
A similar system plus inverters and converter are available for +28 VDC and 115 VAC at 400 cycle. A 28-VDC silver-zinc battery (115 kWh) is
available for emergency.

LIFE SUPPORT: Separate support for forward sphere and mid/aft spheres. CO2 is controlled by LiOH. Closed loop emergency breathing systems
are available for 28 people. An air conditioning system controls humidity and heat.

VIEWING: Five viewports are available: Two in the forward sphere (4-in. diam.), one looks forward and down 30°, one looks 140° to starboard and
30° down from the horizontal. Two (4-in. diam.) in mid-sphere look 70° to port and starboard and 50° down from the horizontal. One in
mid-sphere lower hatch looks directly down and is 3 in. in diam.

OPERATING/SCIENTIFIC EQUIPMENT: UQC (8.087-kHz), CTFM sonar, vertical sonar, altitude/depth sonar, Doppler sonar navigator, sound
velocimeter, tracking transponder for DSRV, transponder navigation system, two T V cameras, side scan sonar, 16-mm cine camera, two 35-mm still
cameras.

MANIPULATORS: One manipulator with seven degrees of freedom on forward sphere.

SAFETY FEATURES: The following is jettisonable: Manipulator, downhau! winch cable, pan and tilt camera units, magnetic anchors.
SURFACE/SHORE SUPPORT: Air, ship, truck, submarine transportable.

OWNER: U.S. Navy Submarine Development Group One, San Diego, California.

BUILDER: Lockheed Missiles & Space Corp., Sunnyvale, California.

REMARKS: Undergoing test and evaluation. Both vehicles are built to the same specifications. DSRV-1 is presently rated at 3,500 ft, but will
eventually reach the 5,000-ft operating depth of DSRV-2.

125

126

FNRS -2

WENGURIE sopcdougdnooccopoucosDOGUDGUOOUOUOO 22.75 ft HATCH DIAMETER: ........... 16.9 in. 1D; 21.65 in. OD
EVM dopo caucus podD dO coor od oDUHO Om Up mUDOO 10.4 ft EIR ESUPPO Ril (MAX) rimcreteterscheleteletstet-tot-t-u=t-1 100 man-hr
IMSKSRIUS ooggoscacoscudodoCoSOUD OD animes OURO 18.9 ft TROTZNLIROMMIEI coo consoddadopndesoocgouooodomes NA
DRAFT: SPEEDHIKNOMS) CRUISES rc cterejetateieten=teledet= fete = 0.2 knots
(MEIC ArU(DENOS osocedpcamoucHooedgoouooDoorOD 28 tons MVR S oooncosoonoopooanooseBoEstc NA
OPERATING DERM sci eee cere cee iee = wee oe 13,500 ft (SEW RIANLONS good tonsonosbouesosOonedoDoEdoOGoodA 1
COMMAPSE DERE srerersrers) sii el elaivielelvl «el =\el= eliste)=he 20,000 ft OBSERMERS sieesctatel siete teietel at tel alte tatetat t-te tte tt-tal 1
(L/AUINTOTSYNIIES, cosectpodepesndegdocdmodoomos oo 1948 IVANALOVNDS (osc conadnaccddagGn ooo nto GoD ooo eens co NA

PRESSURE HULL: Spherical shape composed of two hemispheres cast of Ni-Cr-Mo steel 6 ft 7 in. OD, 3.54 in. thick reinforced to 5.91 in. at
viewports and held together with clamps along an equatorial ring. Weight in air of 10 tons.

BALLAST/BUOYANCY: Positive buoyancy is obtained by 6,600 gal (1,059 ft3) of gasoline contained in six upright, cylindrical tanks within a
22.75x10.4x13-ft, 0.04-in.-thick, iron float. Approximately 8 tons of gravel, scrap iron and iron shot are electromagnetically held to provide
negative buoyancy; the iron shot may be dropped incrementally. A “‘horsetail” of thin cables serves as a near-bottom guiderope and fine buoyancy
control,

PROPULSION/CONTROL: Two electric motors (1-hp each) are mounted topside port/starboard and drive the vehicle forward or reverse.

TRIM: No systems available.

POWER SOURCE: One externally-mounted, pressure-compensated, droppable, lead-acid battery of 14 cells and 900 amp-hr supplies primary
power. A reserve battery of 120 cells is also carried. Both batteries are electromagnetically held below the float.

LIFE SUPPORT: 03 is carried in the pressure sphere and released into the cabin automatically. Cabin air is blown through soda-lime cartridges to
remove CO. Humidity is reduced by silica gel.

VIEWING: Two viewports, each is 5.91 in. thick, 15.75-in. OD, 3.94-in. 1D. One looks downward from the vertical (about 30°) and forward. The
second is in the entrance hatch and looks aft, upward toward the float.

OPERATING/SCIENTIFIC EQUIPMENT: Tachometer for vertical speed, pressure gage.

MANIPULATORS: None.

SAFETY FEATURES: Snorkel for breathing when surfaced. Batteries (2,650 Ib) and all ballast droppable.

SURFACE/SHORE SUPPORT: Can be transported aboard ship and launched/retrieved at sea. Normally it is towed to dive site.
OWNER: French Navy.

BUILDER: Auguste Piccard, with funds from the Belgium National Fund for Scientific Research (FNRS).

REMARKS: Reconfigured to FNRS-3 by the French Navy in 1949-1953 after severe damage to float while in tow during heavy weather.

127

128

FNRS -3

PYSINKSUIe Coosoctocodcongopocnoobdoouueoudp meson 52.5 ft PVAIKC A (OWVAIMISIRSIS” oo esate easasonacans osu ade 16.94 in.
GIE/ANME caséomeboce sonsbenu dot bocsnbosodocoodod 11.1 ft BIREIS UPPO Rita (MADG siterarercrettensnclreierechonsns toler 48 man-hr
(RIES ooonoedeooodsdagodoborcoodgoagane cote meo NA YROnVNL FOMMSRIS Sagscmeosueososuccancoacnaguc 30 kWh
DIAVNIF IE Sood doo OO oot .clacc Oot Oo 0 Od Oo Obi Comoe o NA SREEDIIKNO MS) MCRUNS Ex gre seucuerete tetas svat tsps tensdsi\-ieits ts NA
WEIGRIF(ORS. asooenabonepoccowusdoonootous 28.1 tons IMVARS cio covegamdaooano no adon pind ac 5
ORE R AMIN GIO EE Pirie ctee-lelsielsiemeleteieiek-lene) hel elaie)i= 13,500 ft CEM TANILOUS: oAabocbaooscosnbodoo on aoonenooo fos 1
GCOUEARSEsD E Rail tame retaiateneliel=telaletaitelerestelicie)isjisteitsita bay's 20,000 ft CVSS acls tt dasanssssbooddocnoopod san 1
L/NUNIGRIIEVAUISS saAcsoo cod sombococoaonaoonoO Ob 1953 (PEASAILIOVNDS cooononboo acondw eco aog00 dbooo noo amos NA

PRESSURE HULL: Spherical shape composed of cast Ni-Cr-Mo steel 6-ft 10-in. OD and ranging in thickness 3.5 in. to 5.9 in.
BALLAST/BUOYANCY: Positive buoyancy provided by 2,794 ft3 of gasoline carried in 11 tanks within a thin-walled float. Negative buoyancy
provided by 4,000 Ib of steel shot electromagnetically held in four tanks.

PROPULSION/CONTROL: Two 2-hp, reversible, DC motors provide both main propulsion and steering control.

TRIM: No systems provided.

POWER SOURCE: Two 28-V, pressure-compensated, lead-acid batteries supply 900 amp-hr for lights and motors, One 28-V, silver-zinc battery
supplies 180 amp-hr for all other equipment.

LIFE SUPPORT: Four O09 cylinders carried within the hull. CO2 is removed by soda lime.

VIEWING: Same as FNRS-2.

OPERATING/SCIENTIFIC EQUIPMENT: UQC, echo sounder, depth gage, radio transceiver, compass, seawater sampler and temperature sensor,
still camera.

MANIPULATORS: None.

SAFETY FEATURES: All steel shot is automatically dumped upon loss of electrical power. Batteries also drop upon loss of electrical power (2,600
Ib).

SURFACE SUPPORT: Towed on surface.

OWNER: French Navy.

BUILDER: French Naval Shipyard, Toulon.

REMARKS: Inactive, retired in 1960, Deepest depth reached was 13,500 ft. The two major differences between FNRS-2 and 3 was that FNRS-3’s
float was designed for surface towing and the occupants of FNRS-3 could enter the pressure hull while the vehicle was on the surface through an
access trunk which ran through the float to the hull.

129

ee

| ese ey Be

—w =

T kh — 9 |
ee < tl Q
—

We O39 W 468

ENGINE & GENERATOR
COMPARTMENT SEPARATE

REAR BALLAST TANK

SCANNING
LENS 360° VIEW

CONNING TOWER
WINDOW

” ” _——<———————
12" X 24” WINDOW a ao HIGH PRESSURE AIR TANKS
re mun nC ES SET IN BALLAST TANKS
ROCK BALLAST
DR Zi
OP AWAY ee al DROP AWAY BOTTOM

BOTTOM ee
ae Ze iv NEGATIVE BUOYANCY TANK

We

FLOOD LIGHTS \

we’ STEEL SKID RUNNERS

130

GOLDFISH

TREING et erecetorercleverelsiistaledeielicielel wiel=ts\(e)wielehe\leilafelelsteiu els 28.7 ft FAT CHIDIVAMEME Ritetevereietevalet Selene telarefeleleltet-i-telefai-tefrel= 32 in.
BEAM: NTFS SUP HOMO VS SoosAacococddononmoode 18 man-hr
HEIGHT: TOA NL (HOMME coop accctaanao0dobGdoOanC 1,200 amp-hr
DRAFT: SPEEDIIKNOMS) i GRUIS Etereroretaleteteleteieletetetetat-tatenal=ialfalls NA
WEIGHT (DRY): .. 6.25 tons IWWARKS Deoon codmoo obaooDOoodOooS 5/5 hr
OPERATING DEPT 100 ft GREW SPIMMOMS trevey-secetate tateva lene Pele leveor lel cloteleteiedelsteleleker= tatel = 1
GOLPAPSES DERM se cieienrteleiel <alctefellolelintintaie}evalelelarsiel=1 320 ft OBSERVERS tierce rcsetetetetaietelalovalonotettaisiewaieaiclsiellel sete 3
EAUNGHIDATES) | crstelstotele tefelevateletainleicjelatataleta (e/als/-i=(at- (= 1958 FENALCYNDS sodbocodobocepocaDHoDGoDoGcoOoddN 1,000 Ib
PRESSURE HULL: Shaped as an inverted wedge and composed of 0.25-in.-thick steel plate with 4-in.-thick seamless steel ribs, ‘’I’” beams and

0.25-in. plates mounted at angles,

BALLAST/BUOYANCY: Two main ballast tanks, one forward and one aft and one negative buoyancy tank in the center. Five 122-ft? capacity air
flasks are used to blow water ballast. A low pressure air pump is used to adjust buoyancy on the surface.

PROPULSION/CONTROL: Main propulsion is provided by two propellers mounted port/starboard on the stern. Lateral thrust is provided by two
propellers mounted athwartships on the bow.

TRIM: No systems provided.

POWER SOURCE: Surface power is derived from a Ford ‘60 V8 engine which provides direct drive to the main propulsion units. Submerged power
is derived from eight 60-amp-hr and sixteen 45-amp-hr lead-acid batteries. A 200-amp generator is carried within the vehicle to charge batteries on
the surface,

LIFE SUPPORT: NA.

VIEWING: Three 12 in. x 24 in. viewports on main pressure hull. Two 6-in.
providing 360° viewing.

OPERATING/SCIENTIFIC EQUIPMENT: CB radio, cameras, sonar.
MANIPULATORS: None.

SAFETY FEATURES: Droppable ballast. Pressure hull can be pressurized to ambient by introducing deballasting air into hull for egress of
Occupants through removable windows.

SURFACE SUPPORT: None.

OWNER: Unknown.

BUILDER: Burtis L. Dickman, Auburn, Indiana

REMARKS: Sold in 1973. Was due to be rebuilt by new owner. Present status unknown.

2 viewports on conning tower. One 18-in.-diam. lens in hatch cover

131

132

GRIFFON

Y= CHAIS sotoupesenoootodos Gocco bo BooY SoCo 7.4m invA) VAM ISUISINE ecco socosccoucbnoobeponoonoDs NA
ENB Gogoouccnoe ds Doo dood OO oD EO UOdaodaDodOG 2.1m UNRE SOR FORT IVS Gonanoscdsdnoounboed 100 man-hr
IRIEMCISES acodacedoocosodosodscndo soos CoDoe ocd 3.1m UO NS HOMMSLIS oe cs 666 565.004 oo oniadign SOOO bon NA
BUFUA oar evorens tetetor olialetstahnaals rateneverts ice lelelsfcifuiafeisialekeyaielet stats NA SPREEDICNOMS) CRU) S Emear-rtcnsteterstalentsretetertelera terete tetra NA
(MEK UDIENADS secocnooceccanoupadDooDdeoodd 12 tons WY apart. dO D5 AO OOOO ROT OUOIOOOE 4/6 hr
OPERYANTILDVS SIPURIS soococgasotognodgcuodosoDEas 600 m CREW RUE OMS! fesey cious. svenchelavcusueteheveyersaseel oneteystia tel arcvss fave ene 2
COMEAPS EID ERM ten pavetetale teveleiton siel bel piccl’sisielsleiavel siecle = NA OFSERWERS odbosioc bogo00dos dO COMB EDeNoOO0 1
ACN GEDA Eisitetoretciatetatetalet< [fete folacelistetelisifavel-faislat-iele 1973 EN ALOVND RE coo bondannoogoussanobace scopoRceee 200 kg

PRESSURE HULL: Central cylinder with an OD of 1.60 m capped with a forward cone closed by a hemispherical cap and after cone through which
shafting penetrates. Hull is composed of 210-mm-thick steel.

BALLAST/BUOYANCY: Four main ballast tanks of 2.4-m3 capacity blown by compressed air. Gross pre-dive ballasting is adjusted by the removal
or addition of lead weights on the keel. Submerged buoyancy is adjusted by fore and aft variable ballast tanks within the hull which allow a total
adjustment of 130 kg. An anchoring device consisting of 20 m of cable and a 200-kg anchor allows vertical hovering control near-bottom.

PROPULSION/CONTROL: One,three-bladed propeller at the stern (5-hp) provides main propulsion. Two vertical thrusters and one lateral thruster
all of 0.5 hp.
TRIM: Up/down bow angles can be obtained by transferring fresh water between two forward and two aft tanks within the pressure hull.

POWER SOURCE: Nickel-cadmium batteries are located in jettisonable pods outside the hull. The batteries are pressure compensated and provide
all electrical power. A 28-V battery within the hull is for emergency power.

LIFE SUPPORT: Gaseous 02. CO, is removed by soda lime. Monitors for 07, CO2 and cabin pressure. Three individual emergency breathing
apparatuses are connected to the main O2 supply.

VIEWING: Five viewports. One is in the access trunk and four are on the pressure hull bow.

OPERATING/SCIENTIFIC EQUIPMENT: UOC (Straza ATM 504 A) which also operates as a transponder interrogator, an echo sounder, a pinger
and a transponder. Depth gage, TV, VHF radio, gyrocompass, two recording echo sounders, sample basket.

MANIPULATORS: One, with a reach of 1.60 m.

SAFETY FEATURES: Battery pods and manipulator are jettisonable (total about 900 kg). Anchor cable can be cut with a pyrotechnic device. Two
fire extinguishers.

SURFACE SUPPORT: Supported by the ship TRITON which may either tow it to the dive site or launch/retrieve it on station.

OWNER: Operated by the Groupe d’Etudes et de Rescherches Sous-marines (GERS) and the French Navy.

BUILDER: French Naval and Construction yard, Brest.

REMARKS: Undergoing sea trials as of February 1974.

133

PLASTIC DOME

HATCH

THRUSTER

PRIMARY SCRUBBER

SECONDARY SCRUBBER

STARBOARD
VIEWPORT

HYDRAULIC
POWER
UNIT

MANUALLY DROPPED
BALLAST

GUPPY

(UEINKCIMRIE Sonndébootcosons oon soooorDsagEooDADOnS 11 ft iVvAinels! IVANMISIHERIS sodonancceocacopmoocuccoaoo 20 in.
VANE anococoosonpdon Fane SoC ooao Ueno dob IeoO00D 8 ft EIREISUPRRO Rite (MAD) siicvcr-yameirreaskereteicucr meus rane tablets te 72 man-hr
(ACRE. SAoc Said Sean oer Sta cro SRG OT hen Eee ee ones 7.5 ft Tent OMS oeocasunumodtadsouusopocosnede tethered
DEYNFUS casos acoso cdo soaobbonoO sn nOnOO Roo eBseaD 5.6 ft SHES) (USNC RS)S CRUISES a ooscosgonedsonoroscscdosohs 1
(EIA WORNDS cosnodsoocadnscbdocopconcoere 2.5 tons MARS. soooadneonootnonsaonoduopo dD 3
QMERVATMINICIDISIPUIRIE oogonaasonoonsoosgcodobe 5 1,000 ft OS Vaio tooneaschpesdvnooccadccdcus comclcronsas 1
COPEAPSEID EPilitl-matstetstararsiatstelaieital-hel-ielelnetsiienals 2,000 ft OOS WWARS ‘snanendososacsbAooot ot aogcaneasn 1
LAN UN Cin) BVA ED osc bood ance nd Ooo oGomaoD oo5 © mer 1970 PEN ECOVNDS coos as ocdangenUoneedhecoboUeedO DON Ue? 850 Ib

PRESSURE HULL: Spherical shape of HY-100 steel 66-in. |D and 0.5 in, thick.

BALLAST/BUOYANCY: An internal, variable ballast tank controls surface draft and main + buoyancy. Two lead shot hoppers (150 Ib each)
provide negative buoyancy and a 400-Ib weight in the keel provides additional negative buoyancy.

PROPULSION/CONTROL: Two port-starboard mounted 10-hp, 440-VAC, 1,140/560 rpm, reversible and rotatable (180° in the vertical) motors
provide lateral and vertical maneuvering.

TRIM: Fore and aft shot hoppers may be differentially emptied to obtain up/down bow angles.

POWER SOURCE: Derived from 440-V surface generator through a 35-kW cable.

LIFE SUPPORT: 0 cylinders carried within the hull. 02, CO and temperature/humidity gages are also carried.

VIEWING: Three viewports one 16-in. diam., 1.25-in.-thick, hemispherical viewport is incorporated into the access hatch. Two 8-in.-diam.,
1-in.-thick, hemispherical ports look forward on the centerline.

OPERATING/SCIENTIFIC EQUIPMENT: Hard line telephone, depth gage, inclinometer, corer.

MANIPULATORS: None.

SAFETY FEATURES: Mechanically releasable weight (400 Ib). Shot hoppers can be emptied (300 Ib). Vehicle can be retrieved by its power cable.
Sixteen man-hr emergency breathing, fire extinguisher, surface flashing light.

SURFACE SUPPORT: SOO.

OWNER: Sun Shipbuilding and Dry Dock Co., Chester, Penna.

BUILDER: Same as Owner.

REMARKS: Has not operated for several years.

135

\

agp

a GtBh-sZ TAS

ONE POINT BEACON LIGHT
LIFTING EQUIPMENT

ANTENNA

TRANSPONDER BATCH
EEA
STABILIZING FIN VERTICAL THRUSTER VIEW PORT
I I~ CONTROL
GUARD
PANEL OBSTACLE

AVOIDANCE SONAR

@ EXTERNAL LIGHT

UNDERWATER
CAMERA

DIVE PLANE

MANIPULATOR

INBOARD EQUIPMENTS BOTTOM KEEL

SAMPLING
TRAY

136

HAKUYO

Li=INKen nls oGonnos Sos OOD OOO OO Do OOO OOD Dome . LVAUELIOVANMISTIER cocdsosscocoonscocootoobOT 62 cm
BEAM site tonctiet sitet aRete tarot) atisloleiiailstis fal afe)/nsiis)ellelevelisielis wile) clea lata LIFE SUFORIP (MARIS Siccanmon0ntoacadooacs

inlEINR Badecoocodonodeo to OOD Colo-cioco reco ue och a TORN LIROMERS onotdcoonssochaoooseudacnods

IOIRAVNFITS coopocounoogonoUgoo co cUnS aie A SPEED (KNOTS): CRUISE

ENGR (DENS: 6 oad0 0 ce0.tcc ooo UO memoraic mood MAX

OPERATING DEPTH: Senet CREW: PILOTS og8 aie

COLLAPSE DEPTH: 35 OESERWERS coggessondo

(LYAWINICIRIIDVNIIES nn ooogos cone noo Emon to ooo Oe too PAWALCYNSE soadsocosabodensnnd osboecon rood deDonS

PRESSURE HULL: Cylindrical shape of quenched and tempered, high tensile NS46 (Japan Defense Agency Standard) steel. Hull is 1.4 m in. diam.
and cylinder is 12.5 mm thick, endcaps are 13.5 mm thick.

BALLAST/BUOYANCY: Vehicle is made negatively buoyant by letting seawater into the auxiliary tank and pumping out to become positive. A
negative tank is used to Obtain greater negative buoyancy when sitting on the bottom.

PROPULSION/CONTROL: A stern-mounted propeller (trainable 90° left or right) provides main fore/aft propulsion and is driven by a 10-hp
motor. A horizontal thruster, driven by a 1-hp motor is mounted on the bow and O.5-hp vertical thrusters (1 each) are mounted on bow and stern.
Diving planes are mounted on the bow to provide underway vertical control,

TRIM: A lead weight is moved along a rail at the bottom and inside the pressure hull by a hydraulic motor. Up/down bow angles of 10° are
obtainable.

POWER SOURCE: Two lead-acid battery systems are carried in a ring-stiffened cylindrical shell (battery pod) beneath the pressure hull. A 120-V
system supplies power to all propulsion units, hydraulic pump and lights. A 24-V system powers acoustic equipments, compass and indicators.

LIFE SUPPORT A high-pressure flask mounted outside the pressure hull carries the O2 supply. Baralyme is used to absorb CO}, silica gel is used to
reduce humidity. A Drager gas analyzer is used to monitor the interior atmosphere.

VIEWING: Eight viewports are incorporated into the forward endcap, six are arranged around the conning tower. A 90° view is obtainable through
the viewports which have an |D of 150 mm.

OPERATING/SCIENTIFIC EQUIPMENT: UOC (9-kHz), obstacle avoidance sonar, up/down echo sounders, radio, pinger, transponder.
MANIPULATORS: One manipulator capable of five degrees of freedom.

SAFETY FEATURES: Auxiliary and negative buoyancy tanks can be blown in an emergency. Battery pod of 250 kg is droppable. Manipulator
wrist detaches when its applied load exceeds 50 kg. Emergency breathing apparatus is carried in the pressure hull which draws off of the main air
supply. Fire extinguisher, flashing surface lights.

SURFACE SUPPORT: soo.

OWNER: Ocean Systems Japan Ltd., Tokyo.

BUILDER: Kawasaki Heavy Industries, Ltd., Tokyo.

REMARKS: Operational.

137

Fd 1

Seer ete Wes
acetates gs a :
‘tai 2 — od +e i ve * :
ae ' : / AS ? * &
* : ' ‘

y
Ve
ars

» HIKING
ess dea cane scx racy,

PLASTIC
PRESSURE

THRUST VECTOR HULL

NTROL POWER
e ana RETAINING RING

JUNCTION ASCENT TANK

AIR SOURCE = VENT VALVE
STAND PIPE

MOTOR POWER
ote PURGE VALVE

ASCENT TANK (SOLENOID)

VENT VALVE

FLOOD VALVE

FLOOD VALVE

BATTERIES SUMP PUMP

PONTOON

138

HIKINO

(Y=Nennae cooodogocd oct doob ono U Ob OCD OCU UO OromD oO Aine VANE ISIS oo opocosceoocdonogonodn obec none
ENV pasvobooncoo bo +: oa oa se se LIFE SUPPORT (MAX): 48 man-hr
HEIGHT: MOMALIPOWER SF iereere eiarahene Speers a0 2.3 kWh
DRAFT: SPEED (KNOTS): CRUISE HOD OGO 0.9
WIEIERAUDENAIS cosopacopocasosopouKQGgGgoGGGaCdS MAX aes 50 3.5/45 min.
OPERATING DEPTH: CREWE OMS prerereramienetlavelereteonebeterelevaletaher. tataraiclerersvecenerene 1

COLLAPSE DEPTH: OESERMEAG covindcnosccodeodnceghoodmropae6s 1
LAUNCH DATE: 2.2.0... ce ec tee ee eee eee nee IPZWALOYNDR, sonicoddodduponoopecUpoODoGcDoo Bob ESO NA

PRESSURE HULL: Spherical shape of two 56-in. OD plastic hemispheres 0.25 in. thick. The two hemispheres were hinged together by an
aluminum flange and opened to allow entry of personnel. The catamaran hull was constructed of marine plywood, covered with fiberglass and sealed
with paint.

BALLAST/BUOYANCY: Lead ballast weights (1,750 Ib) gave the vehicle neutral buoyancy at launch. Total buoyancy was a function of trapped
air, water absorption, personnel and equipment weight. The pressure sphere furnished about 3,160 Ib positive buoyancy. Floodable tanks at each
end of both pontoons were vented to obtain negative buoyancy. Normally the vehicle dived 10 Ib heavy, but over mud bottom it was 10 Ib light to
decrease stirring of mud.

PROPULSION/CONTROL: Two 1.4-hp, DC motors powered cycloidal propellers forward of pressure sphere and capable of swiveling 90° up or
down.

TRIM: None.

POWER SOURCE: Twenty 6-V, 190-amp-hr, lead-acid batteries are carried in two containers in the catamaran hull. The batteries are exposed to
water and ambient pressure; to protect them, the terminals were coated with rubber cement, most of the air was displaced by the electrolyte, cells
were modified to prevent gas trapping and pressure relief valves were screwed into filler holes of each cell. Voltages supplied were 18 VDC and 24
voc.

LIFE SUPPORT: Gaseous On (514 in.3 at 1800 psi) was carried in the pressure sphere and metered out automatically at 2 SCFH. LiOH was
employed in a 10-SCFM blower circuit to remove CO>. Silica gel was used to decrease humidity.

VIEWING: Panoramic viewing through plastic hull.

OPERATING/SCIENTIFIC EQUIPMENT: NA.

MANIPULATORS: None.

SAFETY FEATURES: Two scuba tanks and regulators carried in the pressure hull for emergency breathing or to exit vehicle after flooding.
SURFACE SUPPORT: Not applicable.

OWNER: Naval Weapons Center, China Lake, Calif.

BUILDER: Same as above.

REMARKS: HIKINO was an experimental vehicle (called a Mock-Up) used to gain experience with plastic hulls; this experience led to development
of NEMO, DEEP VIEW, and other plastic-hulled submersibles.

139

140

JIM

(LISNfentalS concongodsanonaucuson sohdor ao scanned becoodC PVATKn) (EVVANNJETIEIIE coooanooconocDooCKUGDOoadoNT NA
EAE coosdodececdgenGn eee decodooneDdooUC ADE 3.1 ft NFS SUFARORTE UIMVEADOIE ooo nocecsootmoboceoon 16 man-hr
nIEIKGRHS sonsosoopsosgodacondodoodoodopAaodane 6.5 ft WOWAEIFOUMSIA Soccoocsnsouosn sou ooonoedoudE Manual
DIVAS codogoucoounDoopooUréDOUdOO OND oD OoSOGoOdOD SEEEDMKNO GS) CH UISE Myo crermrajeleln) ale iol ere raraiapear NA
(EIST (ORAS. aoocactoaccocogpoCGHadousooad 1,100 Ib MAK oo vaai=ifecs leis eine) ee sfelayoneisselelielate NA
CHERVAIINIGIEP URE coccccso0caagconganococads 1,300 ft CIMES (PIOUS, bonsusoueocoheansoneecbodcoudopoous 1
COINS IEP sosnondonmeddongonuconocbonoe NA OBSERVERS miiwretetareretetarar-fal-teket ter areaener acne eeietaet ie)
Ee MUINKELIEYNUTES boobed oadod saodemon age oue co 6 1973 EA UCPC) ore a.Olo ba god Sic Be ac CicmiO cin ecg coor cic NA

PRESSURE HULL: Main body and dome, knee spacer and boots are composed of magnesium alloy RZ5. All joints are composed of aluminum
alloy forgings, as are the elbow spacers and hand enclosures.

BALLAST/BUOYANCY: Lead ballast of approximately 150 Ib is required to reach neutral buoyancy. Additional buoyancy of 15 to 50 Ib
(depending upon bottom conditions) is required for negative buoyancy. This ballast is jettisonable. For independent mobility the lifting cable can be
jettisoned. By dropping all ballast the operator will ascend at a rate of about 100 fpm.

PROPULSION/CONTROL: A !ift cable provides ascent/descent. Mobility on the sea floor is by walking.

TRIM: No systems provided.

POWER SOURCE: Manual.

LIFE SUPPORT: Sufficient O2 is carried externally in two flasks (440 | at 150 atm. each) and provides 4 hr for working with a 12-hr reserve. The
Operator wears an oronasa! mask with an inhale and exhale tube, both are connected to CO2 scrubbers (soda lime) and work at atmospheric pressure.
Two complete O2 and CO, sets are provided, one for backup. Monitoring instruments in the suit are for QO internal pressure, temperature.
Lightweight clothing can be worn and in the waters where JIM has worked (Scotland) the internal temperature has stabilized at 19 to 20°C.
VIEWING: Four viewports in the dome and two at the back. The viewports are concave-convex lenses machined from Plexiglas 222.
OPERATING/SCIENTIFIC EQUIPMENT: Compass.

MANIPULATORS: Initially four simulated fingers were used and operated on a 1-to-1 mechanical linkage with a thumb on a swivel base, though
satisfactory, other alternatives to these general purpose manipulators are being sought.

SAFETY FEATURES: Lift cable can be released if snarled. Ballast jettisonable. Two life support systems.

SURFACE SUPPORT: soo.

OWNER: DHB Construction Ltd., England.

BUILDER: Underwater Marine Equipment Ltd., Farnborough, Hants, England.

REMARKS: Developmental stage in August 1973 at which time it had dived to 442 ft. Classification to 1,300 ft operating depth was under
contemplation by Lloyds Register of Shipping. JIM’s design and operation fulfill every definition of a manned submersible (chap. 1).

141

SURFACE BOUYANCY
TANKS

ATTACHMENT POINT FOR
HYDRO CRANE

PNEUMATIC VENT

DIVER BALLAST TANK

SONAR CALIBRATION
TRANSDUCER

STROBE LIGHT
PNEUMATIC VENT

rT MAIN PROPULSION
PNEUMATIC VENT MOTORS & RUDDER

PASSENGER & PILOT
ACRYLIC SPHERE

ENTRANCE HATCH

FLARE GUN
SONAR

BOW VERT.

THRUSTER
ELECTRICAL

CONNECTORS

DIVER
GAS SUPPLY

DOPPLER
BOW LATERAL TRANSDUCERS
THRUSTER
HIGH PRESSURE

O, SUPPLY

BATTERY POD SIDE MOTORS

HIGH PRESSURE pi veRs ENTRANCE PORT SIDE-FATHOMETER TRANSDUCER
AIR TANKS & EXIT HATCH STARBOARD SIDE-STRAZA TRANSDUCER

142

JOHNSON SEA LINK

(UINEKARIS aoeecdoodconoonooo Demon rUD doo coomouuD 23 ft HAG HID VAMERMER te rece: etet-tataten=fenelal=\elloire)\vie ella) »\(«1 = [ln\ «iim 24 in.
EZR oougondecooomooddocooocH Us OOO OCOD ONO Ooo 7.9 ft (LIFE SWAPORAT (MAE 8 cocusomocccensenocHoS 72 man-hr
RISKS oocounoeohuooUsooooeBsoDoeooooconoodE 10.8 ft IROUZNG (OWNERS oo bboscancoconocooonooD dD ooboUS 32 kWh
DRYNEUS SocconcouConoCODo UD ode UO OO HOU OOO DIO CG 7.1 ft SPEEDIIKNOMS)SGRUNS Em ierreratetelalsleelelsitclereialelenel-iielel= 0.75
WEIGHT (DEIN) 2 Sie crriere ee nie elm nee we nie eins oieine = 9.5 tons WARS arccoccdubgoronotoceoasosts 1.75
ORERA TING DERM) (yee veto te teyet-t- t=ym la tenalelslinl eile) eree 1,000 ft GREW HEME OMS Mrenctenensctonevayekevaloharerarcitelevel= is l-iinks l(elle=| iel= inte le 1
COLEBAPSE DERM Eye tnratel cde cl= (ells) 1m) «ie re DIVER 6,000 ft OBSERMERS miepepetereleterel stele lateltelis te elfeteleilet=)'sielinbellni=yisin 3

PILOT 6,000 ft PYWALCYNOE a oooccecuceopas be oUouUoD Oooo OO oNOS 1,100 Ib
EEAAUINGHIDAGTI ES iercrctetele!-velemale i=) lelat=) = (0) ellellole ie et=\=\in erm (el 1971

PRESSURE HULL: Two hulls: Forward spherical hull is for pilot and observer and is composed of acrylic plastic (Plexiglas grade G) 66-in. OD, 4
in. thick and weighing 2,300 Ib. The after hull is a cylinder of aluminum (alloy 5456) 50.5-in. OD, 3.36 in. thick and 513/8 in. long with aluminum
(alloy 5456-0) plate hemispherical endcaps 2.33 in. thick at the apex and 2.80 in. thick at the equator. The entire cylinder is 8 ft long and weighs
4,800 Ib. One metal hatch is topside of the sphere and the second hatch is on the bottom of the cylinder for diver lock-out.
BALLAST/BUOYANCY: Surface flotation is from two port/starboard tanks which provide positive buoyancy of 1,940 Ib; these tanks are flooded to
dive and blown with compressed air on the surface. Fine buoyancy trim control submerged is obtained from two tanks located (1 ea.) within the
surface flotation tanks; they are blown by compressed air and contribute +170 Ib of buoyancy. TO compensate for weight of divers and their
equipment when they leave the cylinder are two aluminum tubes (+180 Ib ea.) (which are a part of the top two frame members) and bilge ballast
tanks (+110 Ib ea.) located in the bottom of the divers’ compartment.

PROPULSION/CONTROL: Propulsion is attained through eight reversible 28-VDC electric motors driving 14-in., three-bladed propellers.
Forward/reverse propulsion is from three stern-mounted (trainable 90° left and right) and two port/starboard motors mounted amidships. Vertical
Propulsion is from one each, fore and aft thrusters, and lateral propulsion is from a forward-mounted thruster.

TRIM: No systems available.

POWER SOURCE: All power is obtained from fourteen 2-VDC, lead-acid batteries located in a pressure-resistant battery pod (jettisonable) attached
to the bottom of the submersible. The batteries are aligned in two banks; each supplying 14 VDC.

LIFE SUPPORT: 0, is from two cylinders (2,640 psi at 330 SCF ea.) mounted externally. The starboard tank supplies the sphere and the port tank
the cylinder. He for the diver’s cylinder is supplied from a sphere (1,750 SCF) and four reserve buoyancy tanks (502 SCF). To remove CO both
sphere and cylinder carry 8 |b of Baralyme through which fans force compartment air.

VIEWING: Panoramic viewing through plastic forward sphere. Three viewports in the aft aluminum cylinder, one is central on the forward endcap
and one each (port/starboard) on the cylinder. All viewports are double acting, the outside port is 7-in. 1D, 9.5-in. OD and 1 in. thick. The inside
viewport is 10.25-in. OD; 7-in. 1D and 2 in, thick. Two additional viewports are located in the double-acting diver’s egress hatch.

OPERATING/SCIENTIFIC EQUIPMENT: UQC, Doppler sonar navigation system, CTFM sonar, transponder, pinger, echo sounder, compass.
Diver-to-submersible, sphere-to-cylinder communication system,

MANIPULATORS: None.

SAFETY FEATURES: Scott-type breathing masks in both sphere and cylinder are connected to high pressure air system. Battery pod (1.5 tons)
jettisonable. Surfacing can be controlled from diver’s compartment. Divers and pilot/observer may lock-out in an emergency. Both surface flotation
and ballast/trim tanks can be blown at operational depth (1,000 ft).

SURFACE SUPPORT: R/V JOHNSON with articulated crane.

OWNER: Owned by the Smithsonian Institution, Wash., DC. Operated by the Marine Sciences Center, Ft. Pierce, Fla.
BUILDER: Designed by Mr. Edwin Link, built by Aluminum Co. of America (ALCOA).

REMARKS: Operational. A second vehicle is due for completion in 1974,

143

ACRYLIC HEMISPHERE
MAIN BALLAST TANK VENT VALVE

FWD MBT BLOW VALVE
AFT MBT BLOW VALVE
(NOT SHOWN)

AFT MAIN BALLAST TANK

}

FORE MAIN
BALLAST TANK

VIEWPORT
PROTECTOR

Tol

TRIM PUMP VIEW PORT

BATTERIES
VARIABLE BALLAST TANK

DROP LEAD WEIGHT

144

K-250

LUENEHTAS ssooewadecaocSs cod oot aqenEoOodeaSuBed 10.5 ft PAT CHID VAIN EciEiRisime-wcreth snc peast-ea-erarer crctea sve eycdesele tees 22 in.
SAE anooooos dono oononodHogsconcoDbOseoFo0CD 4.7 ft EIREZSU PPO RTs (MAX) caeretrenene renee -telctalelsietetaie) ceric = 6 man-hr
InMEICNRIS oon ootoondonoossb ono po Oman ong SeonoddS 5 ft VOM AL IROMMIEIRS onodesoboocdooscnbboonoDboNAd CGS NA
DAVANEUE oooodbosouonpoboD oD oG oo DD DODO OODC OD COD OO 3 ft SREEDMKNOMS) CRUISE remraiaieteolalalcleyateleie ieee ieistarees NA
WEIR WEIR) anodcoddcocccooeocoonooooneoud 2,200 Ib Ai evetenste fete etter eds elogesenciesaieterstensla erehe 2.5
IPSIRVATONIG OEP na cosas dsocoeccsceosoneodees 250 ft CREW MPI OiiSmrcwerucacten pereupercecrancnco-cneecs palelic-iouset svationenetencus 1
(CKOVLILAVFSVE IDIEFIARK = cocacendodoonnacndnCdocdnoogs NA OBSERVERS mance tetetateie lene! ietolelelsictlsitiatsicta seta) tars Oo
LAVINIA OVAINES. Gooddgonaccouoeoadonesnoonese ca. 1966 IPANALCYNDR ose codbuccodcaonoobboonopoooosdepdag 280 Ib

PRESSURE HULL: Cylindrical shape composed of 0.25-in-thick gage steel with internal ‘’T’’ bar frames.

BALLAST/BUOYANCY: Two fiberglass main ballast tanks, freeflooding and blown by compressed air. A variable ballast tank within the hull
Provides buoyancy changes when submerged. The VBT is normally pumped dry, but can be blown dry if necessary.

PROPULSION/CONTROL: Two motors (port/starboard) are rotatable 360° in the vertical. The motors have three speeds forward and are manually
rotated. A rudder provides underway directional control.

TRIM: No system provided.

POWER SOURCE: Four 12-V, lead-acid batteries carried within the hull.

LIFE SUPPORT: Relies upon air entrapped in hull when hatch is closed. Snorkel for surface operations.

VIEWING: Plastic dome (24-in. diam.) on conning tower provides 360° of viewing. Viewport in bow 2 in. thick, 16-in. diam.
OPERATING/SCIENTIFIC EQUIPMENT: UOQC, depth gage.

MANIPULATORS: None.
SAFETY FEATURES: Droppable weight (190 Ib). MBT’s and VBT can be blown dry at operational depth. Pressure hull can be flooded for

emergency egress.

SURFACE SUPPORT: soo.

OWNER: Various.

BUILDER: G.W. Kittredge, Warren, Maine.

REMARKS: Six of these vehicles were completed by 1971 and six more were under construction at that time. Also designated as the VAST MK III.

145

HATCH CLOSURE
ELEC. PENETRATION

ELEC. PENETRATION a

OXYGEN BOTTLES
U.W. TELEPHONE

STEERING MOTOR

CLEAR ACRYLIC HULL
MAGNETIC COMPASS

GYRO COMPASS

AMMETERS & VOLTMETERS
(BATTERIES & MOTORS)

VERTICAL MOTOR
MOTOR SWITCHES
CIRCUIT BREAKERS
STEERING MOTOR
CO-PILOT SEAT

SCRUBBERS

FAN MOTOR

FAN

SILICA-GEL & SODA LIME

PILOT SEAT
WATER BALLAST CONTROL
BATTERY CABLE
ACRYLIC COVER OUTLETS

MAIN HULL PENETRATION

CABLE FROM BATTERIES
(HOOKUP NOT SHOWN)

WATER BALLAST PUMP
MAIN PROP. MOTOR

DROP WEIGHT
(BALLAST)

146

KUMUKAHI

IEE NIGH EAitetetet ate tevaietevalat-dela le vevelczanet= rel =[oVel sllsi=in) =lia)ielivie) ais) = 5,9 ft HAGCHIDIAMESTIE Rim steneteisteteiseatclsyaieteronelsiaieevstcierstetel= 18 in.
BIE/NN soc ooooo do ooo OD OD aD NOC pOSUOOnOUMGOUCOaDS 6.6 ft (UNF SUPROGRAL (MMAVSIS cas sdeacoonsonoanceas 32 man-hr
(RISIGInE ooddocpucotoopooucauCUUDKDO OU DOUOo or 7.5 ft TROTVNILIHOMMSRIS op Gocsconsos condo Fon doOtaoDGOn 5.1 kWh
IRVNIFIIR ooo. co mou OO IDIOIW 0 0.0000 Go-cieicolo OU IES O10 rHespico 7.5 ft SPEEDKIKNOMS) iC RWIS EX ee rersteteteverelayelelelstelelelietei=ietels 1/4 hr
WHEKSTT (RENO coo oocodoscotos Dodoo oOo Se Og DOD 3,700 Ib NUS loo depdvaoou Conon ooenood 1.3/3 hr
ORE RAHN GrDE RT yt ofererelejaltels lol elelm elnjieisie\n)s\ee vere isrs 300 ft CAME (PULCUS sodoocbodnsobaopuoctehuGeraGocouNes 1
(QOWLIL/NPSIS (DIEIPWe oosotdcnsccnonsonogGeuOudas 1,000 ft QRGERMSRE codscactocpoavvscobbosubooDEos 1
FPAWINC HED AMES 2 cretetsto lel alia lstetelene)niaielepeteis)si'siie/ elles iefensrs|.s 1969 PAW IMOVNDS sopenscotoodssomooroocoodU Hoodoo 600 Ib

PRESSURE HULL: Sphere of Rohm and Haas Plexiglas G, 1!/g in. thick, made in four parts and hot-press molded. Quarter parts bonded into a
sphere using epoxy resin. Hull buoyancy 3,045 Ib, weight in air 690 Ib.

BALLAST/BUOYANCY: A 150-psi pump moves water into or out of a 15-gal tank within the hull to provide 93 Ib of + buoyancy.
PROPULSION/CONTROL: Four fixed, reversible, !/3-hp motors; 12-VDC Sears & Roebuck outboard trolling motors with minor modifications for
kerosene-filled pressure-compensation and mounting. Two motors are mounted at the sides of the sphere for fore and aft motion. One motor is
mounted at the top facing athwartships for transverse motion, another is mounted at the bow facing up for vertical motion.

TRIM: None.

POWER SOURCE: Two 18-VDC pods, each with three batteries (lead-acid) of fast drain type. Batteries are ESB Ltd 9, 143 amp-hr/6 hr built for
golf cart use. Batteries are submerged in oil (SAE 30 motor oil) and pressure-compensated by a seawater bellows.

LIFE SUPPORT: Two Scott Aviation O02 cylinders and two CO humidity scrubbers contain soda lime and silica gel (2 men, 8 hours, 0.5% CO},
60% rel. hum.). Instruments to check internal atmosphere are: Teledyne model 330 O meter, MSA CO, tester, Taylor temperature/humidity gage,
Taylor 2-psi differential pressure gage.

VIEWING: Panoramic viewing through plastic hull.

OPERATING/SCIENTIFIC EQUIPMENT: UQC (27-kHz), Directional gyrocompass and magnetic compass, depth gage.

MANIPULATORS: None.

SAFETY FEATURES: A 440-Ib steel drop weight is located under the pods and is actuated by three turns of the thru-hull bolt. Pods and mount
frame release with seven more turns of the same bolt. Flood valve can equalize internal pressure in 1.5 min for blow and go ascent to surface.
SURFACE/SUPPORT: SOO.

OWNER: Oceanic Foundation, Makapuu Point, Waimanalo, Hawaii.

BUILDER: Oceanic Institute, Mak apuu Point, Waimanalo, Hawaii.

REMARKS: On display at Sea Life Park, Waimanalo, Hawaii.

147

So Pecan

; << ia = a = <>
Stet Paaeeste _- ,
ee ( 4Us : é €

COMPRESSED AIR CYLINDER
ELECTRIC SUPPLY CABLE

OBSERVATION WINDOW
HAND RAIL
RUDDER

HOISTING HOOK AZIMUTH FINDER

TIDAL CURRENT METER
\ OBSERVATION WINDOW
SONAR SOUNDER
BALLAST TANK

UNDERWATER
FLOOD LIGHT

PROPELLER

ANCHOR CHAIN

TURNING MIRROR

OBSERVATION WINDOW
OBSERVATION WINDOW

REVOLVING STAND

148

KUROSHIO II

(LENCE cucduccdosbesccseecuueconoboogac cmos 11.8m HAT CHIDNAMEMER), | ont jeyerorterecici cecvee svete overs ¢ 538 mm
BEA Mister atenersisietotalevatcietalalinial sel equitet =) mi=isis)'=tereeie\)el \{-1</)elel6 2.2m PIR ESSU PPO RANA sinret-c- -teterelefeiarecciels) ciel sei eieie 96 man-hr
(Flaketshyrs oooncdooeroononpoODooOD oon moOCooDOUD ODO 3.2m TGOmALI ROWER tetas arndesemi scm itvosicinicice akc. tethered
PIVRUe. paconousodbboonomeGdr aoe On ao oD OOmOnIIG 1.9m SPEEDIIKNOMS) ACRUISEO wane sinc cic ner cine cine ceontinters 1
VOSVGR Ar DEN) contsumoso¢omoob ooo dou oD Deo 12.5 tons WOVENE Seen sere ele Ce ec CP Ie ee ee 9 2
OPERATING DEPTH: 2.2.6.6 26. eee eee oe 200m Se PONS eci.ccudune tin cone ond oD Come e sari oo 2
COMEAPSESD ERIE smener-tetercrelotsleleiaietorsisieleielelehelei=ielele 365m OBSERVERS Weir ears ct oe een eae 2
PAUNGHIDAT Ei veiarerercneleienelele\eieieselininteelefehsieieselsti=ialalsb< 1960 PENRO YD: Ara oan.oola ro DEO Oe Oise ee ne ion NA

PRESSURE HULL: The main section of the hull is a cylinder of soft steel (SM41) 14 mm thick; 1,482-mm OD and 5,600-mm length. One end plate
is a hemisphere of soft steel 24 mm thick and 1,300-mm radius. The other end plate is a cone of soft steel. The hatch coaming is a cylinder of soft
steel 12 mm thick, 550-mm OD and 1,000 mm high. All components are joined by electrical welding.

BALLAST/BUOYANCY: Two ballast tanks fore (240 |) and aft (180 |) within pressure hull are flooded and pumped dry of seawater to obtain
desired surface weight. A main tank (6,000 |) below the pressure hull is filled with seawater to capacity to obtain negative diving buoyancy. To
ascend the ballast tanks are pumped dry and, upon reaching the surface, a low-pressure air hose from the support ship is used to blow the main tank.
PROPULSION/CONTROL A stern-mounted, three-bladed,, 800-mm diam. propeller provides lateral propulsion and is driven by a 3.2-kW,
three-phase AC, 4006 motor. Underway lateral control is through two rudders mounted within a cylinder surrounding the propeller which is trained
left/right. Two stern-mounted, port-starboard bow planes control vertical movement.

TRIM: Up/down bow angles can be obtained by differential filling of the VBT’s.

POWER SOURCE: A 600 m long, 36-mm diam. cable from surface ship supplies all electrical power.

LIFE SUPPORT: Compressed O, is carried in a 40-|-capacity cylinder. CO, removal is through a 100-W ventilation system.

VIEWING: Sixteen viewports throughout the vehicle ranging in diameter from six 60-mm, seven 120-mm to three 160-mm.
OPERATING/SCIENTIFIC EQUIPMENT: Hard-wired telephone to support ship (24-V, battery-powered), battery (3-V) powered compass, tidal
current meter, water temperature sensor, horizontal vertical sonars.

MANIPULATORS: None.

SAFETY FEATURES: Main ballast tanks can be blown. Electric supply cable can be manually detached from within the pressure hull. Vehicle can
be hoisted to surface by power cable. Marker buoy.

SURFACE/SHORE SUPPORT: Towed by support ship to and from dive site.

OWNER: University of Hokkaido, Hokkaido, Japan.

BUILDER: Japanese Steel and Tube Co., Hokkaido, Japan.

REMARKS: Operational. Kuroshio | was a tethered vehicle also, and operated from 1951 through 1960. Kuroshio I| radically departs from its
Predecessor’s design, in that Kuroshio | was basically a diving bell configured for support from the surface.

149

CYCLOIDAL PROPELLER HATCH

PLASTIC SPHERE

INTERIOR SUPPORT STRUCTURE
HYDRAULIC DRIVE MOTOR

ELECTRICAL BOX

BALLAST AIR sronase Af
BATTERY POD

BATTERY

BALLAST TANK

HYDRAULIC MOTOR PUMP UNIT CENTER CROSS STRUCTURE AND SPHERE TIE DOWN

150

MAKAKAI

LiZiNkenie cohpavocmocon DODO C0O. Ob on Codi DOCG OO 18.5 ft HATICHI DIVA MEME Ri) Sricyecalelepslelelelelelshel=\«) smi === /els lke 18.5 in.
TEAWR Soocoocdocn moOU BODO oe anu O ero OUDOO BOD OOOO 8 ft EVEEISUPPRORI (MAX) eye eieere ere ele sie =te © om ele == 72 man-hr
HACIA a5boouooccon Dob O OD GO coo oo ccioo-0 OL0.OU 7.5 ft TRO NEIAOMMSIRIG Goocoo ob ebpoODOO OOOO ODIOO ODO oc 36 kWh
DIRYNEIS seco oood 0 an00 0.008 00 COU Dodou DODO OUIGo 5.9 ft SPEEDI(IKNOMS) CRUISES erence oie viaje sie), = ier 0.75/8 hr
WEIGHT (DRY): -...0.2-- 20.0.5 00.0-- 2 eee a 5.3 tons MUMS cocedscsucsnuoHuOnDoOonONOoUUO 3
OPERATING DEPTH: 2.2... eee eee eee ee eens 600 ft GREW IE OMS eave ereietatenevetclolielatedoletells('stelle (1 e)'e\feNelel = fel «ilsile'=/fal'n 1
GOLLAPSE/ DERM “i.e eee wre ie se es een 4,150 ft OBSERVERS) errecr ere ciejs ce 0 wie vivir ee see eisieicies ais 1
L/NUIN Cir] PYMINSS Gop psocouoocuDooU DOOD OCD eon GOOD 1971 PANAIROAID Siete ile lalate cloierefistiesellel=i«)\=[lat=)\s/=) eel») ale) sisielc?s! ie 870 Ib

PRESSURE HULL: Acrylic plastic (Plexiglas G) sphere composed of 12 spherical pentagons bonded together with adhesive. Hull is 66-in. OD and
2.5 in. thick. Top (hatch) and bottom plates are of cadmium plated 4130 steel. Bottom plate is for passage of penetrators. Hull weighs 1,500 Ib in air
and displaces 5,500 Ib in water. A 0.5-in-thick acrylic cap around the pressure hull protects it from abrasion or accidental impact.
BALLAST/BUOYANCY: Variable weight system consisting of four pressure-compensated ballast tanks mounted at each corner of the vehicle from
which water may be pumped into or out. System is limited to three complete fill/refill cycles by the volume of compressed air used for pressure
compensation, 400 |b may be gained or lost.

PROPULSION/CONTROL: Two Kirsten Boeing, pi-pitch cycloidal propellers provide four degrees of maneuvering freedom and are driven by a 4-hp
hydraulic motor.

TRIM: Gross trim is adjusted manually before diving by fore or aft movement of 1,200-Ib (each) battery pods. Trim is controlled up or down by
Pumping water fore or aft in the ballast tanks. Roll is controlled by pumping water overboard on one side and taking water Onboard on the other.
POWER SOURCE: External, pressure-compensated, lead-acid batteries in two pods, each containing a 120-V and 30-V battery string. The 120-V
string is made up of twenty 6-V, 190-amp-hr batteries which power the propulsion and ballast systems and lights. The 30-V string powers the
controls, electronics and scientific instrument payload.

LIFE SUPPORT: ©, is stored in the pressure hull in high pressure flasks and is bled through a pressure reducer at 2 #t3/hr. CO, is removed by
Baralyme and water vapor by silica gel. Both O2 and CO, are monitored visually from instruments within the sphere. Three blowers circulate the air
to remove water vapor and CO.

VIEWING: Panoramic viewing is provided through plastic pressure hull.

OPERATING/SCIENTIFIC EQUIPMENT: UQC (8.08-kHz), two depth gages, altimeter.

MANIPULATORS: None.

SAFETY FEATURES: Emergency breathing through two closed-circuit 02 rebreathers of 36-hr capacity each. Pressure hull mechanically releasable
from chassis. Jettisonable 50-Ib ballast weight. Jettisonable 1,200-Ib battery pods (2,400 Ib total). Additional surface freeboard (3 ft total) may be
obtained by inflation of four modules (one at each corner of the chassis).

SURFACE SUPPORT: Air, ship, or truck/trailer transportable. May be launched/retrieved from conventional ship with necessary capacity handling
system. Has been deployed and retrieved with LARP system (see chap. 12).

OWNER: U.S. Naval Undersea Center, San Diego, Calif.

BUILDER: USNUC, Kaneohe Bay, Hawaii.

REMARKS: Placed in storage in 1974.

151

HORIZONTAL THRUSTER
WITH HYDRAULIC MOTOR

LIFT HOOK

MAIN PROPELLER

VIEW PORT HORIZONTAL THRUSTER

BATTERY POD

152

MERMAID I/II

(L(SNentel: secos ocoo dooeoU O00 od UrndoO 4 OcsoICIDIOIMIOOn, 5.15m HAST CHAD) A ME gE Ricmietencpsietioueneltenstelfenel pifcanielalefviede)eltalis\e 0.60 m
BENE Soococdbotoponuo5 opUCoD boo OUOUUumoDme on 1.70m BIE ESSUPPOIR GT (MAX) Saanerctatans)<taketetated Nel elelslalinielle 120 man-hr
RAESUG EAM ierene pata detetarclavel elt ele) oleleiehei=[~i-rat= le) «ieiele) sire) (nila l= 2.60 m TOTAL (HOMMEIIE” co poomocduoduacoog ona COO CURE 16.2 kWh
DIRVNFIE conodspcnu Od OOmDOUDOn GOOD om OIOOn COmou cE 1.8m SPEEDI(IGNOMS HG RUIS Egatereteteretatskeletalaleteteiat=tanet-t ae 1.5/8 hr
WENGE (IRMA) 3) terete crete oles nel = lel «oe nl eims wreile 6.3 tons WMS noscédan soouopeDdooUOUoDaO 3/4 hr
OPERATING DEPTH: <2. cee we ecw wt tee eee 300 m CIEE TILOUSY ph nig cacubougceboucodeDonODU DOO CUODC 1
GOEPEAPSEIDERT Es (ice cre wtere + ale = fole sime) fein) leiielnle | « 600 m OBSERVE RS miirancievercontic ic close sel eterevevelelecoxe lupehayetere 1
(E/N Kets hloySUISe) Sc coc crowd oro olo-old Olu Oro Gin GOO Orolicen 1972 7 WAhoyND)s = sh dcecov ont cconcodao booooo Gon aap ac 550 kg

PRESSURE HULL: Cylindrical shape composed of three cylindrical sections and two endcaps of high tensile steel (St 53.7). Diameter of the
cylinder is 1.25 m; thickness is 15 mm and total length is 4.30 m. A cylindrical conning tower (600-mm diam.) is welded to the main hull.
BALLAST/BUOYANCY: Glass-fiber reinforced ballast tanks (300 kg total) are located one on each side and atop the pressure hull. The tanks are
free-flooding for descent and blown dry for ascent by compressed air. Fine buoyancy adjustments are made by regulating tanks in the pressure hull
which are blown by compressed air.

PROPULSION/CONTROL: A stern-mounted propeller driven by a 3-hp motor provides fore and aft propulsion. Two lateral thrusters, one in the
stern and one aft of the conning tower, are each driven by a 1.6-hp motor. All propellers are controlled independently and are reversible which
allows any combination of lateral thrust.

TRIM: Within the “‘legs’’ beneath the vehicle is a trim system which is hydraulically or manually Operated and can obtain up/down bow angles of
+20° by moving the batteries fore or aft.

POWER SOURCE: Within the two “‘legs’’ are pressure-resistant containers holding two lead-acid accumulators which supply 660 amp-hr at 24 V. An
emergency battery of 24 V, 115 amp-hr is carried within the pressure hull.

LIFE SUPPORT: 0, is supplied from tanks of 24-1 capacity mounted external to the pressure hull. CO is removed automatically on command by a
special compound called Drager-Atem Kalk and a CO, detector controls removal rate.

VIEWING: Four viewports are available: three in the conning tower of 180-mm diameter and 35 mm thick and one in the bow of 22-mm diameter
and 55 mm thick.

OPERATING/SCIENTIFIC EQUIPMENT: UOC, echo sounder, depth gage, directional gyrocompass.

MANIPULATORS: None.

SAFETY FEATURES: Mechanically droppable ballast. Ballast tanks may be blown at maximum Operating depth by a hand valve or compressed air.
A pressure sensor may be set to automatically activate surfacing if maximum depth is exceeded. Emergency battery in pressure hull; hull may be
flooded for egress.

SURFACE SUPPORT: soo.

OWNER: International Underwater Contractors, New York City.

BUILDER: Bruker-Physik A.G. Karlsruhe, West Germany.

REMARKS: Operational. A prototype, MERMAID |, was launched and tested in 1972. From these tests modifications were made and the vehicle
renamed MERMAID I/II in 1973,

153

ELECTRICAL DECOMPRESSION
CONNING TOWER HATCH SWITCHBOXES CHAMBER

HORIZONTAL
THRUSTER

TRANSFER
CHAMBER

MIXED GAS
DIVING EQUIPMENT
VIEWPORT
MAIN PROPELLER

NAVIGATION
PANEL

HORIZONTAL THRUSTER

BATTERY POD ANCHOR DEVICE DIVER LOCK OUT

MAIN ENGINE VIEWPORT

154

MERMAID III/IV

PEEING isterenetey stad ckerotencie tee tet «fellelevelalelefairsiey sel) =1lelad=1=1 =ii=)i= 6.2m VMI MOVAMIEINSRB canoodcocpnosGosos0d main hull 0.6 m
FE/AME ecoonsngocbcoddos Cos CoD eOOUD UO OOOOUO 00 1.8m HATICHIDIAMEME Rte rereistetslelatelaterelsicre'slereyale lock-out 0.7 m
VEG ilpsrenerehateteraveuste otcloveheralniel=-lelafmiei=(=).-P=i'=\el=ie zal ele-e 2.7m EIRESSUPPROR Te (MAX) isi tcp terete) relarel=terar<lelereyerace! = 120 man-hr
PIRVAIFYR pacnoonacocoon code Sooo n oon COU OUOUOD OOnIO NA TRON NU IHONMERS Soosscnancoogo0dccouggoco mudd 36 kWh
WEIGHT (DRY): .. 10.5 tons SBEEDI(IKNOMS) FI CRUIS Eierracerlsteret-tsichataceperave apeust-)anars NA
OBERVATING DERM ra terete ay<ieleleleisieVelsi©ls\ehe) leis! lene sae 200 m WARS saonteoodootesoedcsopecass 2/1 hr
COLIYN-s laruink adoacoonqeoonconecodouqUoGoUE NA CRAVE FICHS oasccsssonnccnbo cobb dDodDodeOduoGdS 2
LAWN DYNES Soo cosdasoupdDo noone oUOOsnOOObO 1975 OBSERVERS! ciecsteysteye ecotstexs;eud ces ueke: cece censieus eyeychers 2

RAMEE OAD Eire ieieteieratelelotel elioiiel g isilepeivpslet= vale tet=h=lei=i=inicminledet == NA

PRESSURE HULL: Composed of two cylinders of high tensile steel (St 53.7) both with hemispherical endcaps and joined by a cylindrical chamber.
The forward cylinder operates at atmospheric pressure; the after cylinder operates at ambient pressure and is equipped for diver lock-out.
BALLAST/BUOYANCY: NA.

PROPULSION/CONTROL: Main propulsion is from a 10-kW, stern-mounted hydraulically-actuated propeller continuously variable in speed and
reversible, Two lateral thrusters of 1-kW each are mounted fore and aft, provisions can be made to also incorporate vertical thrusters.

TRIM: NA.

POWER SOURCE: Same as MERMAID 1/II.

LIFE SUPPORT: Same as MERMAID 1/II for the atmospheric (forward) cylinder. He/O2 supply for the divers consists of four flasks of 50-I
capacity (each).

VIEWING: Nine plastic viewports. Five in conning tower of 170-mm diam. and two of 80-mm diam. Four viewports in lock-out chamber of 70-mm
diam. The bow can be fitted with two or three viewports or one large plastic hemisphere.

OPERATING/SCIENTIFIC EQUIPMENT: UOC, depth gage, echo sounder, compass.

MANIPULATORS: None.

SAFETY FEATURES: No data available, but is assumed equal to that of MERMAID 1/11.

SURFACE SUPPORT: SOO.

OWNER: International Underwater Contractors, New York City.

BUILDER: Bruker-Physik A.G. Karlsruhe, West Germany.

REMARKS: These are two identical lock-out submersibles. MERMAID III/IV is scheduled to be operational by 1975.

155

GLASS HEMISPHERE

CONTOUR
BUCKET SEATS
as,

fea BATTERY CASES Pas
i ee
TRIM PUMP =

VARIABLE BALLAST TANKS

RADIO ANTENNA

LIFTING EYE
LIFTING EYE

FORWARD
BALLAST TANK

BALLAST TANK

MAIN PROPULSION MOTORS
MOUNTED OUTSIDE

N QUICK-RELEASE DROP KEEL
TRANSDUCER

156

MINI DIVER

UERICHIE sacspoosopouooDoUnO Ub DONOR e mood oO Ouo 16 ft HAICHIOUAMEMER Grrrl sRelelaioicistet-Veteletelsialsiel<)eferaistetsi« NA
VE/NMB scoop Goobogord 06 hoe nooLoDOpOD DOD EoOoDUOD 3.5 ft DIREIS URE ORs (MAD) mt etetetanstaetsieterst ateten<tatevers fairs 18 man-hr
FIEUCGIEHTS ocoosoopodomopoouDMoG oda DOO pOdOODomOUMOD 5 ft MOTALIROWER cimretedenetstersie micusiayersvorarsuets isu-yaie seceded . NA
IDIRVAIF IES -o Gd0n dc gobo Ac DOR OboDO GU hOODOODUOD Soup et 2 ft SREEDIIKNOMS)CRUIES Cagepaieterete site tototet as iatetaleletate 1/6 hr
(WEHGIA WOYRNOS neosocsee pug asso orp OOD Oe OT. 1.9 tons WWAVS: compe obinoodeuuD OOO oODoDOoO0S 6
ORERATINGIDERM Ean cperaretatere) «leseistenen-n0,-teheieselwvaeeteyfel= 250 ft SEW (PIMOUS snasosdonboanpoodaecanddooccHodoa 6 1
COREARSE DERdH te cmreterelel-rel=iener- aoorcoone soos 400 ft OESISAMERNS saccossastossenocsnsbedsugaas 1
(NUN PYMNSS ooconocucodoos oon OdU OOUDO oOo oo 1968 PENAMUCYNDE Soomacccbacoodn donee odasouaoBeduc 300 Ib

PRESSURE HULL: Cylindrical shape of welded steel 0.275 in. thick; 3-ft OD. Penetrations include two for motors, dive planes, rudder and three
for viewports.

BALLAST/BUOYANCY: Surface buoyancy derived from a main ballast tank; submerged buoyancy changes are obtained from a variable ballast
tank.

PROPULSION/CONTROL: Latera! propulsion is obtained from two stern-mounted, 1-hp, 6-V propellers. Diving planes and a rudder provide
underway maneuvering.

TRIM: No system provided.

POWER SOURCE: All power is derived from four 6-V lead-acid batteries.

LIFE SUPPORT: Compressed air for 07; CO absorbant.

VIEWING: Three, 16-in. diam. acrylic plastic viewports.

OPERATING/SCIENTIFIC EQUIPMENT: Transponder, Fathometer, artificial horizon, chronometer, compass, UQC.

MANIPULATORS: None.

SAFETY FEATURES: Droppable ballast, emergency breathing apparatus for escape

SURFACE/SHORE SUPPORT: SOO.

OWNER: Great Lakes Underwater Sports, Inc., Elmwood Park, III.

BUILDER: Same as above.

REMARKS: Not operating. Deepest dive 70 ft. Undergoing refit, operational future depends on market for vehicle or services.

157

158

NAUTILETTE

FOE NU Gitilelisteeteetelciats|eflslateheiciatel=tmrataiatata/ -islwielaleis 1-man: 11.25 ft HATCH DIAMETER 2 . a0 Seo Aes UN
2-man: 13.75 ft LIFE SUPPORT (MAX) onde od So coode 1;2 man-hr
HENGE Soaoteasoouodaagque Sports tie oD Se be ba TOPALPOWER: (<.- -:- <o06 soc con aéotowsoc 4.4 kWh
HEIGHT Spapeleter crete ie, <3 =the varcrers . : c 3.9 ft SPEED (KNOTS): CRUISE ieteistehsl st Sa su syedsievsr -2/Ou0%
PIRVNEWS naongocoosn coup SU OOO OCC 5 50 a2 2Oitt MVS coooonGoonsocsenaboeoS aon 5/3 hr
(MEIGRAPWDIShie ssScosocsneopconoonuone 1-man: 1.9 tons CRIEWRENMOHRS ssodoccbdoconbonegseenooeees es cteyarecen ae
2-man: 1.2 tons ORSERWASES sooscoscess -..-.. 1 (2-man model)
ORERATING DE RIls topes crepeteretet ale etoiesclalnlere:0ie)isleierel nia 100 ft PAVE OAD iierer-ycicrelelistsiakelolalcleletsicl= t=] -\'=\=1'==ls)elnlel=)=iFel=iceis NA
COPBAPSEIDERMH Ds fiers cletaieierselets inte l<leie)=)=/=1=) s)/s7a1'=) = 1,800 ft
NUNC PY MASS GabpoocooconoeDooobdGUobOoOUC Odo 1964

PRESSURE HULL: Cylindrical shape composed of steel, 9.375 in. thick and 30-in. 1D.

BALLAST/BUOYANCY: Interna! ballast system (400 Ib) which can be pumped dry by an electric motor or manually.

PROPULSION/CONTROL: A 1.5-hp, 24-VDC reversible electric motor in a pressure-resistant container drives a propeller mounted topside aft. Two
bow planes and a rudder are manually maneuvered to obtain underway control.

TRIM: No systems.

POWER SOURCE: Four 185-amp-hr, 6-V, lead-acid batteries provide all power.

LIFE SUPPORT: Air within the pressure hull at time of hatch closure provides about 1 hr/passenger breathing. Soda Sorb used for CO removal.

VIEWING: Cylindrical plastic dome (two on 2-man model) over hatch openings and one forward on bow. Domes are 0.5 in. thick on cylinder
portion and 2.5 in, thick on plate portion.

OPERATING/SCIENTIFIC EQUIPMENT: Depth gage, radio, lights, remote compass. The Haight 1-man model has a hard line radio from vehicle to
surface buoy.

MANIPULATORS: None.

SAFETY FEATURES: Droppable weight.

SURFACE SUPPORT: SOO.

OWNER: Various.

BUILDER: Nautilette, Inc., Ft. Wayne, Indiana.

REMARKS: Three vehicles built, two 2-man and one 1-man, and are located as follows:

1-man: Mr. D. Haight, Warrensville, III. (used for salvage of wrecks).
2-man: Mr. C. Russner, Nashville, Mich. ,
2-man: Nautilette, Inc., Ft. Wayne, Ind. (used for commercial purposes).

All models are capable of operations within 48 hours.

159

160

NEKTON ALPHA, BETA, GAMMA

BE NGiGilsiereretetercisrst= Behera casicietsietsheletetetel > 15.5 ft HA CHID VAMESIE Risttetereleteteiietetel select lrieiatelsteleletsarer= t= 18 in.
BEAM: ... o- as SOO OOO DO 5 ft LIFE SUFRORT (MESS coc ook osonpooocopDode 48 man-hr
HEIGHT:.. SOO SOSA OCOD OOO RDO OOOO OCOD sre Gant TREMP ALL ITHOMMEIS = conoodcccoonoc ose ccouosoeoOn 4.5 kWh

1.5/3.5 hr

DRAFT: .. oe ehelsteeiie,nielenel'ei'sssieleie}sisielis! soe 4ft SPEED (KNOTS): CRUISE .

(MElKern Re (ORNS OF Ooo ooscooooDpeccootooUoeooND 2.35 tons MAX 2.5/1 hr
OPERATING DEPTHS) varcacielel='s)=)< sles wirieirivle soto Uo CREW: PILOTS std choles 99 1
COPLEAPSE) DERM isc ieiecpatetereloteliel'=!'ssieis\'s)(e)« seis e1s)o\e\e 2,500 ft ORSSIRWIERS casdodcudonboctooudeo05GK00 O00 1
EAUNCH DAME: ccs) -7- speteietavelciarclelals 1968, 70,71 BAYA OAD eteersleneiate retest erelisie! oitel.=i== ie)=> (ollel'='lw! =te"=1=\=! =! 450 Ib

PRESSURE HULL: Cylindrical shape of A-212 and A-515 (BETA, GAMMA) mild steel, 9/16 in. thick, 8-ft length and 42-in. 1D. Conning tower is
24-in. diam. and 24 in. high of A-285 steel.

BALLAST/BUOYANCY: Vehicle launched positively buoyant, flooding of fore and aft ballast tanks (1,500-Ib capacity each) produces 15 to 20 Ib
negative buoyancy for descent and during dive. Fine buoyancy control can be obtained by venting or blowing a 30-Ib-capacity tank in pressure hull.
PROPULSION/CONTROL: One 3.5-hp Westinghouse M-15 electric motor (24-V) mounted on the stern within a pressure-resistant tank, drives a
10-in. diam. propeller. Mechanically actuated rudder provides lateral control anda starboard-mounted dive plane provides vertical control.

TRIM: Up/down bow angles are controlled by dive plane.

POWER SOURCE: Eight 6-V, 190-amp-hr, lead-acid batteries, wired for 24 V and 48 V, carried in a pressure-resistant compartment.

LIFE SUPPORT: Compressed > is carried in the pressure hull in two tanks, one tank is of 50-ft? capacity and the other is of 25-ft3, both are at
1,800 psi. CO is removed by blowing air through Baralyme cannisters of which four each are carried (2 |b Baralyme/cannister). An aircraft altimeter
is used to measure ambient cabin pressure.

VIEWING: Seventeen acrylic plastic viewports are provided which are flat discs 6.5 in. in diameter and 1.25 in. thick.

OPERATING/SCIENTIFIC EQUIPMENT: UQC (8-kHz) 2,000-yd range, needle type depth gage (0-1,300 ft), scanning sonar (audio, variable
frequency), Straza-type tracking system (37-kHz), compass, directional gyro, echo sounder, sample bag.

MANIPULATORS: One hand-operated manipulator consisting of a 3-ft long rod penetrating the starboard side of the pressure hull through a
stuffing gland and terminating in a 3-pronged grasping device can be manipulated by the observer to obtain suitable samples or artifacts.

SAFETY FEATURES: Emergency breathing provided by two scuba regulators attached to a high pressure air system (72-ft? capacity).
Mechanically-droppable, 75-Ib lead weight, propeller-rudder assembly droppable (40 Ib), ballast tanks and trim tank blowable at maximum operating
depth (1,040 Ib total).

SURFACE SUPPORT: Supported and launched/retrieved at sea by either R/V SEAMARK or R/V DAWN STAR. Launch/retrieval from SEAMARK
by a non-articulated boom, from DAWN STAR by an “A” frame type apparatus. A total of four people is required to support and operate the
submersible and support ship (DAWN STAR) at sea.

OWNER: General Oceanographics, Inc., Irvine, California.

BUILDER: NEKTON, Inc., a subsidiary of General Oceanographics.

REMARKS: All operational. NEKTON ALPHA varies from sister submersibles in the following: length 15 ft, weight 2.25 tons, payload 300 Ib, and
in its topside bow viewport configuration.

161

CONTROL
CONSOLE

LIFE SUPPORT AND
MANUAL HYDRAULIC

MAIN BALLAST
TANK ELECTRICAL AND
HYDRAULIC

HIGH PRESSURE AIR PENETRATOR PLATE

BALLAST BOTTLES

SERVICE
MODULE

BATTERY
COMPARTMENT

NEMO

LENGTH: nVAsineta) AVA MISTISIIS. coccoocenedoceaenononsoos 18.7 in.
[HENME soodtoosgcososaneaudenoenopounooeooUSH 3 (URI SUAROR TP UNV s bcoscensaAnsoccesoend 64 man-hr
IRIE cbeonnscebocds scosso see comeobooaoose E TROT EIFOMMSRE goncenséucScaenononoececoens 15 kWh
DRAFT: SREEDIKNOMTS) MC RUIS Earereyete seetatatel ete teretere l= 0.75/8 hr
WEIGHT (DRY): INV oone ooo éntéogeotreseos uo NA
QHERVATUNIGIDIEPIIE sacooogpoteoosoopocougoun 600 ft COMES (PUIIMOHIS cosccoccneSootsecoccoucerocoseoose 1
COLLARS DISPUIRE sodcoonddo0de0coeognensouse 4,150 ft QDS IWaARS sscccosendassuossotoococooords 1
ILANUINICIA BYES co ccosedcacouspccesaenpacnoeods 1970 FAN ALOVNS! soaccoocas0ecuDeSoSobooseE 850 Ib (incl. crew)

PRESSURE HULL: Acrylic plastic (Plexiglas G) sphere composed of 12 spherical pentagons bonded together with adhesive. Hull is 66-in. OD and
2.5 in, thick. Top (hatch) and bottom plates are of cadmium-plated 4130 steel. Bottom plate is for passage of penetrators. Hull weighs 1,500 Ib in air
and displaces 5,500 Ib in water.

BALLAST/BUOYANCY: Main ballast is supplied by an 8-ft3 capacity free-flooding cylindrical tank below the pressure hull. Deballasting is
accomplished by six 50-ft3 capacity air bottles at 2,250 psi. which make available 19-ft3 (371 SCF) of air at 600-ft depth and allow two complete
cycles at this depth. A free-flooding auxiliary ballast tank aft has a capacity of 2 ft3.

PROPULSION/CONTROL: Two 1.5-hp hydraulic motors mounted on each side of the vehicle drive 8-in. diam., shrouded propellers, which serve to
rotate the vehicle in the lateral plane and to allow short excursions when at neutrai buoyancy. Within the service module is a hydraulically-driven
winch (1,200 ft of 0.25-in. wire ropes) which the pilot can operate to provide vertical excursions (anchor weight 380 Ib).

TRIM: Not required.

POWER SOURCE: Main power is from twenty-one-6-V, 150-amp-hr, pressure-compensated, lead-acid batteries supplying 120 V. Secondary power
is supplied by a 20-amp-hr, silver-zinc battery carried within the pressure sphere

LIFE SUPPORT: 03 is stored in two 50-ft3-capacity tanks at 1,600 psi and automatically bled into the sphere at a selected rate. CO) is removed by
blowing air through an 8-Ib cannister of Baralyme. Silica gel (50-in 3) removes water vapor. Partial pressure of O2, cabin pressure and CO content
are continuously monitored, a Drager kit serves as backup measuring device.

VIEWING: Panoramic viewing through the plastic pressure hull.
OPERATING/SCIENTIFIC EQUIPMENT: UQC (8.08-kHz).
MANIPULATORS: None.

SAFETY FEATURES: Two closed-circuit O2 rebreathers for emergency use. Internal emergency power supply can actuate anchor cable cutter drop
battery pack (2,170 Ib in air), blow ballast tanks and operate normal life support system. There is also a manual anchor cable cutter.

SURFACE/SHORE SUPPORT: Air, ship, truck transportable. Launched/retrieved at sea from any ship of 100 tons or greater with an over-the-side
handling capacity of at least 10 tons.

OWNER: U.S. Naval Undersea Center, San Diego, California.
BUILDER: U.S. Naval Civil Engineering Laboratory, Port Hueneme, California.
REMARKS: Not operating. Now at Southwest Research Inst.

163

HINGE OF ENTRANCE HATCH
CONNING TOWER

SIDE-THRUSTER : FENDER V!EWPORTS (4)

PRESSURIZED SEAWATER BALLAST TANK TRANSDUCER U.W. TELE
FIRST STAGE CLAW FIRST STAGE MANIPULATOR CABIN VIEWPORTS (8)

PROTECTIVE
SONAR HOUSING

VARIABLE PITCH PROPELLER
MOVABLE MAIN BATTERY HOUSING RETRACTABLE

AUXILIARY MACHINERY SONAR DOME
SEAT/BED EMERGENCY BALLAST
ECHOSOUNDER TRANSDUCERS

164

NEREID 330

REIN Galil siemeten tetera viel eValntetal kote fetetatciavalaynlslisiinie lsifagetel/avele 29 ft VAIS VAM IESNTISR 5 noo GocadcoodGodeon Jono 22.8 in.
BEAM: PIRES UPPOIR TE UNAD) tetetenetatencten=tetelcneietsusierste!< 7 96 man-hr
HEIGHT: TOMALES POWER meena deneiaiererbercroiatetsianetlcess) atsiiscaisiats 40 kWh
DRAFT: SREEDRRNOMS) kG RULS Eger eretetetcten eels) oistieveve 2/8 hr
WEIGHT (DRY): INMWARS co sidiectonooo sobeo moo sues omotro <!
SASWATUNGCHIDESPINS osadégocc0cgc0vcognonmoodoD 330 ft CREWRIRAILONES. gcc co0oa0dabao ondG DOOD U emo eSOOOD 1
(ROMANS DIAVIIAR GooodoodocadasoosdocooHOOUS 500 ft OESERW SERS 6564 5d0G055000005 eae Penh chee es
(L/NUINTG A IDYNTIES 55 gonads ccn0osc0scdbenoUdDUdDOT 1972 PENALOVND BS Gant cote ob odoaen aco one ooonde ooo .. 5,500 Ib

PRESSURE HULL: Cylindrical shape steel hull, OD of 70 in. symmetrical axis perpendicular to fore-aft axis. Dished ends. Two cylindrical
extensions, OD of 20 in. on port and starboard side, length of 13 ft.

BALLAST/BUOYANCY: Main ballast tank is half filled with seawater and air compressed at a higher pressure than the 330-ft operating depth; to
obtain negative buoyancy a pump is used to add more water. To obtain positive buoyancy a purge valve is opened which biows the main ballast dry.
One 200-| atmospheric tank provides auxiliary negative buoyancy.

PROPULSION/CONTROL: A stern-mounted, laterally-trainable, variable-pitch propeller driven by a 10-hp motor provides main horizontal
propulsion, A 2.5-hp lateral thruster mounted aft of the pressure hull assists in fine maneuvering control.

TRIM: Up/down bow angles of 30° are obtainable by hydraulically moving the main battery housing fore or aft.

POWER SOURCE: Nine 12-V each, lead-acid batteries are carried in two longitudinal pressure-resistant tubes below the vehicle and deliver 200 V.
Four 12-V, lead-acid batteries supply 24 V.

LIFE SUPPORT: Two 12-I-capacity tanks.

VIEWING: Thirteen viewports.

OPERATING/SCIENTIFIC EQUIPMENT: UOC, CTFM, gyrocompass, depth indicator speed log, downward-looking echo sounder.

MANIPULATORS: Two; one is 15 ft long and capable of 2,500-Ib lift; the second is a smaller one attached to the larger arm which is used to
perform delicate operations. Installed on starboard side near center of buoyancy. Gripping force of the large claw is 6 tons.

SAFETY FEATURES: Internally-pressurized buoyancy tank may be blown by entrapped air to operational depth. Hand released reserve ballast
(700 Ib). Emergency breathing equipment for leaving flooded hull through escape hatch.

SURFACE SUPPORT: soo.

OWNER: Nereid nv. Schiedam, Holland.

BUILDER: Same as above.

REMARKS: Operating. A 700-ft lock-out NEREID 700 was scheduled for launching in 1973, but nothing has been heard of this project since May
1973.

165

166

OPSUB

(EN GIARR soadoonconosbesucouSsobeoeoooonodon6 HS 18 ft nVANIClA OWNS pancopcadas0ocoononbeosaqnd NA
BEAM ceararatetolobolalatstnicieleleusisioxsliekstelskete\'e/'s.eueneysienelleKereitete 8.5 ft FE SURRORI UMAR Nes oosopeoccodcomoboonT 48 man-hr
REGU Aileceeettetietatettelaltelietal exelefisioteleieluie|lellaatale}alieleroi=leleieisiele 7.5 ft THOT E TOMES on onbeoboeoudcocdneDouoODoood Tethered
DRAFT: 6 ft (est.) SPEEDICNOmS) CRUS Exper craretenetecstaker-tenerersiatete arate =r NA
WEIGHT (DRY): 5.2 tons WWAYS non coododckd sodas Sotogdood 2

OPERATING DEPTH: 2,000 ft CORSE IMO gosocccnddo esos don oomdoosusebe Goes 1

PRESSURE HULL: Spherical shape, 66-in. OD, 0.5 in. thick and composed of HY-80 steel.

BALLAST/BUOYANCY: Large weight changes are compensated for before the dive by changing external weights in the fixed ballast compartment
on a droppable weight platform. Small buoyancy changes during the dive are obtained through a variable ballast tank (200-Ib capacity). The tank is
flooded to fill and pumped dry.

PROPULSION/CONTROL: Five motors provide propulsion. Three are for horizontal motion and are mounted port, starboard and aft, the aft
motor is trainable 90° left and right. The remaining two motors are thrusters for horizontal and vertical control. All motors are oil-compensated,
10-hp, 350-Ib thrust, and are reversible with two speeds forward and aft.

TRIM: No systems provided.

POWER SOURCE: An umbilical from the surface provides 50 kW of power from a diesel generator providing 440-VAC regulated power.
Communications, TV transmission and voltage sensing also passes through this wire. The umbilical is 1,000 ft long, 1.4-in. diam. and has a breaking
strength of 10,000 Ib, it can be cut by the vehicle if the need arises.

LIFE SUPPORT: Three O2 flasks are carried in the hull. CO2 is removed by Baralyme in a forced-air scrubber. O2 is monitored by a Teledyne
Analyzer, CO2 is monitored by a Drager Analyzer, a second Drager Analyzer (Multi-gas Detector Mod. 21) measures both CO2 and CO. An altimeter
measures cabin pressure. Two scuba bottles (compressed air) and regulators provide emergency breathing for approximately 4 man-hr.

VIEWING: There are 13 viewports total. Four are in the hull, eight in the conning tower and one in the hatch.

OPERATING/SCIENTIFIC EQUIPMENT: UQC and hard wire communications, scanning sonar, TV, 35-mm still camera & strobe, two depth gages,
directional gyro.

MANIPULATORS: None.

SAFETY FEATURES: A 600-Ib, droppable weight, emergency breathing, backup communications on batteries, umbilical cutter, running lights, fire
extinguisher, life jackets, underwater flashlights.

SURFACE SUPPORT: soo.

OWNER: Phillips Petroleum, Bartlesville, Okla.
BUILDER: Perry Submarine Builders, Riviera Beach, Fla.
REMARKS: Inactive, has not made an operational dive.

167

MAIN

PROPULSION FAIRING

oe ©
DC

MTR
METAL
FAIRING
PRESSURE

HULL
BATTERIES

168

PAULO I

(HEN(CHlale comon oon God COS oo como rom Ome Ose ta Oo 13.5 ft PACA DUAN MISINSIRIS coangbononmoncondgongboad 20-3/4 in.
EAU! Scooter ain omolerso o¢ Baio MOO. DOE cae Gace De 4.5 ft LIS SUF ORAr MOS conuscokecenoonegoen oe 96 man-hr
RNEIKGIRIS Aso oadenoen oo ooco oo moo Ooo. coe. tip oso teon 6.3 ft ROR ANC HOMMEIRIE E Sauls 4 moe Od eae Sthon boo MOOD ..5.2 kWh
IDIFYNETS. os cb ot aneeseooaaopootae oo goat aoe pode - 4.5 ft SPEEDIICN OTS) EC BUS Ee iierrenasetedeleielata tsi kauase nes 0.75/25 hr
WUBINCIRI WDIRNOIR oasccosgopsaenGosacdgdoneHBscos 2.6 tons WARS ao oasooaecsancags ecieaetee SALON:
QRSRVATUNG DIFP ab oooadoooongoscop mono oe aso o 600 ft COLES IAIMONERS condor odosAoe 165 5cd0sb6socu05NES saat
SOLLNSE DIZPUIE seoosdnccnsscogeeasuobBobeE 3,650 ft COISIWASERS. scoscesosocenedoacneood Soe cr bo.c I
PAGING HID Ai Eitercyleveteron=ieWelacen spol aeife cxeyeS=iellees =\'s\ eas} =ter 1967 IVASALOYNDS nococanpoooogsoodes eanuvaneoooD .. 480 Ib

PRESSURE HULL: Cylindrical shape with hemispherical endcaps. Cylinder is 4-ft. 1D, 8 ft long and 0.75 in. thick of A 212 steel. Endcaps and
hatch are 0.5 in. thick of a 212B steel.

BALLAST/BUOYANCY: Main and fairwater ballast tanks provide 480 and 3,000 Ib positive/negative buoyancy, respectively.
PROPULSION/CONTROL: A stern-mounted, 11-in. diam. propeller is driven by a 4-hp Bendix, 4,000-rpm, 30-amp motor. Propeller may be trained
mechanically left or right and is reversible.

TRIM: Ten 6-in. OD, 40-in.-long tanks of 48-Ib capacity each may be vented or blown to adjust trim.

POWER SOURCE: Four 6-V, 217-amp-hr. each lead-acid batteries provide 6, 12, or 24 V through a selector switch to provide main power supply.
Auxiliary power is from two 92-amp-hr each lead-acid batteries.

LIFE SUPPORT: 03 is carried in two 70-ft3-capacity tanks at 2,200 psi with automatic flow adjustment. A blower circulates air through a soda
sorb cannister to remove CO2.

VIEWING: Ten acrylic plastic viewports. Six are in the pressure hull forward area and are 4-in. 1D, 8-in. OD and 2 in. thick. Four girdle the conning
tower and one is in the hatch which is 2-in. 1D, 4-in. OD and 1 in. thick.

OPERATING/SCIENTIFIC EQUIPMENT: UQC (42-kHz), Bendix Magnesyn compass, depth gage, echo sounder, altimeter and differential pressure
gage.

MANIPULATORS: None.

SAFETY FEATURES: Mechanically droppable keel (100 Ib). Main and fairwater ballast tanks can be blown by divers from surface ship. Pressure
hull can be pressurized and opened for emergency exit.

SURFACE/SHORE SUPPORT: SOO.

OWNER: Previous owner: Anautics Inc., San Diego, Calif.

BUILDER: Same as above.

STATUS: Sold in 1971 to Candive Ltd., Vancouver, B.C. and leased on long-term basis to Arctic Marine, Ltd., Vancouver, B.C. who reconfigured it
into the present SEA OTTER.

169

Ses ag

Ke eid amine =

; LFS ee peg

epee ok By >

: ———

| aed
SURFACE UNDERWATER
RADIO TELEPHONE

ANTENNA TRANSDUCER

AFTER HATCH
TRIM FORWARD
AND TRIM AND
V.B.T. VARIABLE
FIBERGLASS \ BALLAST
FAIRWATER \ TANK FIBERGLASS

FAIRWATER

OPERATOR'S

COMPARTMENT FORWARD nan 7)

BALLAST Bile |

BOW

HOVERING
MOTOR
ROOM AFT AUX. F.W.D. DROPPABLE BALLAST
FOOT comp. FOOT
WELL WELL

PC-3A1 &2

IEINICTInIS Godconooncosop cosmo mono noOg oom foo 18.5 ft DVI OWA MIZITSRIS onoceoodecdannonRcooooneOs 19 in.
BSN caoagoogodcuon sos OO DODO SuObOdOodON Godde 325 ft LIFES SUAPORTE (MERE cogaccocopbGosdsocdogs 20 man-hr
HEIGHT: aoe S00 a s/s TOR MANLIAOWMEINS ooconpodeonsopoconsoos cuca don 7.5 kWh
IDIRVNRGT so conacs 35) fit STEED (SNICKERS CMOS, Gass onchasocandg05n5bL 2/8 hr
WEIGHT (DRY): 55 occ Sa0 = .. 4,790 |b WAYS a melo casted Aaa adamen ese 4.5/5 hr
OBEIRVACIIN GIDE Pili Fl citer tere tetefotelcy alee si ttacs: efslcierstals .iteile 300 ft CREWRIPILOUS saccadgaccnnondosbcaqncuocpsGo 90056 1
COLNE ERP WRIS socoscondcedgougoudod0d0DIdS 500 ft ORDISIRIWIERS sqocdanatscbansonednasosonooas 1
WAUINTCIR EVIE coassssccotsadosacesooe .. 1964; 1966 PENALOVNDS so coodsdoccrndocanoodoengsagcadeds 750 Ib

PRESSURE HULL: Main hull, motor room and battery compartment are of 0.25-in.-thick A285 steel. Canopy is 0.25-in.-thick plate, heads are of
A285 steel. Hatch trunk is 0.5-in. S.S.-ASTM A-351 casting and hatch cover is Almag 335 casting. Mechanical penetrations in hull are for propeller
shaft, hatch opening shaft and droppable keel operating shaft. Motor room is separated from batteries and operators by a wall capable of
withstanding full ambient pressure at operating depth.

BALLAST/BUOYANCY: Main ballast tanks are made of 11 & 12 gage A285 steel and located fore and aft to provide displacement of 1,250 Ib.
Trim tanks may also be employed to provide 320 Ib displacement.

PROPULSION/CONTROL: Main propulsion is from a stern-mounted, 7-hp, 36-V, 855-rpm, Allis Chalmers motor with infinitely variable speed
control. Hydraulically-operated rudder and bow planes provide horizontal and vertical maneuvering. Bow or stern thrusters of fractional hp are
available if required.

TRIM: Two tanks, 0.25 in. thick, of A285 steel, 160-Ib capacity each can be blown or pumped to and from seawater or fore and aft from one tank
to the other. Valves and piping are stainless steel of non-corrosive 600-psi test minimum. Trim pump is a Hypro 3.1 gpm at 200 psi driven by aG.E.
0.5-hp, 15-amp, 32-V motor.

POWER SOURCE: Six 6-V, 210-amp-hr, Excel, lead-acid batteries, type GRP 6, are located in a pressure-resistant, gas-tight compartment.
Optionally, silver-cadmium (72 Yardney Ys-200) or silver-zinc (100 Yardney LR-200) batteries may be used to extend cruising time to 10 and 20 hr,
respectively.

LIFE SUPPORT: CO) removal by Baralyme (4-qt supply) through which air is drawn by two 72-cfm Vane-Axial Blowers. One external 70-4t3,
2,200-psi O27 bottle connected to reducer to flowmeter and regulator. Low pressure air is connected to the scuba regulators which can be used in an
emergency.

VIEWING: Seventeen viewports through vehicle, thickness is 1.0 in.; 1D of 6.5 in.; OD of 8 in.

OPERATING/SCIENTIFIC EQUIPMENT: UQC. magnetic compass, depth gage.

MANIPULATORS: None.

SAFETY FEATURES: Pressure hull can be pressurized and flooded for escape. By blowing ballast tanks or dropping solid ballast the following
positive buoyancy can be obtained: Main ballast tank 1,250 Ib, trim tanks 320 Ib, keel 180 Ib. Emergency air is obtained through scuba regulators
and hoses off the low pressure air supply. Ballast tanks can be blown through external connections.

SURFACE SUPPORT: SOO.

OWNER: U-‘S. Army and U:S. Air Force.

BUILDER: Perry Submarine Builders, Riviera Beach, Fla.

REMARKS: Operating. Kentron Ltd. of Hawaii operates these vehicles for the Air Force and Army.

171

SURFACE RADIO ANTENNA

BOW HOVERING ane

MOTOR HIGH FREQUENCY

HATCHES UNDERWATER PHONE

FORWARD TRIM
& VARIABLE LOW FREQUENCY
ACOUSTIC PHONE

PLASTIC FAIRWATER
4

UNDERWATER

AFT. MBT
MOTOR ROOM

FWD. BATTERY
AFT. BATTERY

AFT. TRIM & VBT

\ TV LIGHTS (2) FLOOD LIGHTS

TRACKING HYDROPHONE DROPEPEEE KEEL
MECHANICAL ARM

172

PC-3B

LISNICHIAR sanocodoosccogoocpcamaoodUUO Gc dd uolo od PMNS OIVANMISUIEING gooonacohatocosteusooneanees 19 in.
IEAM: ooncoosodososonononosoosoOCdDSouDDASoGO0O z LIFE SUPPORT (MAX): . 40 man-hr
MIENGIsnre. osenoodbbugocsoocotobotongo duoddedas fs MOMALIP OWE Riss texevetagererccreicncisssteerens eye cievencns i) averele 10 kWh
(QYRVAIFUTS cog dteotobocadseoseeodoo spd obCobodaUuDOdS . SE BEDIKNNOMS IMC RUIS Emserreveteteret-tedelemistatevate roe 1.75/10 hr
WIEIGIRAT (DIRE oqo ecdd-0.0 bonoo 6 DOSOM Ur Oro WAS oe baa bod seR OOS OOo ee GeEios 4/2 hr
OPERATING DEPTH: CREW 2 RUE OMS erecetsners eres cieeersienae aici concie wie Suexs iste qeow U
COLLAPSE DEPTH: ESSERE gsacedcoaachonpowdcesaobookoon 1
LAUNCH DATE: PAWL OAD si crepsiotebove ce teteyenonetatcte ist susiciaelcl scusiersveuatcuctey 300 Ib

PRESSURE HULL: Main hull of 0.5-in.-thick plate and heads of A212 steel. Canopy of 0.25-in.-thick plate and 3/8-in. heads of A212 steel. Motor
room & battery compartment 0.25-in. plate and heads of A212 steel. Hatch trunk is 0.5-in.-thick S.S.ASTM A-351 casting; hatches are Almag 335
castings. Mechanical penetrations in hull are for propeller shaft with crane seal backed up by pneumatically Operated seal; two hatch openings and
one droppable keel operating shaft.

BALLAST/BUOYANCY: Main ballast tanks made of 11 & 12 gage A285 steel are located fore and aft and provide a displacement of 2,000 Ib. Trim
tanks may also be employed to provide 400-Ib displacement.

PROPULSION/CONTROL: Main propulsion is from a stern-mounted, 7-hp, 36-V, 855-rpm, Allis Chalmers motor with infinitely variable
speed controls. Hydraulically-actuated rudder and bow planes provide horizontal and vertical underway maneuvering. Bow or stern thrusters of
fractional hp available.

TRIM: Two tanks, 0.25 in. thick, of A212 steel 200-Ib capacity each can be blown or pumped to and from seawater or fore and aft from one tank
to the other. Valves and piping are of stainless steel or other non-corrosive material. Trim pump is a Hypro 6 gpm at 400 psi driven by a 2.5-hp, 36-V
60-amp, Milwaukee motor.

LIFE SUPPORT: CO) removal by Baralyme (4-qt supply) through which air is drawn by two 72-cfm Vane-Axial blowers. O2 is supplied from one
externally-mounted 70-ft3, 2,200-psi bottle connected to reducer to flowmeter and regulator. Two scuba regulators within the vehicle are connected
to the low pressure air supply for emergency breathing.

POWER SOURCE: Either silvercel batteries or 10 lead-acid batteries may be used which are located in a pressure-resistant compartment just above
the keel and aft. The silvercel batteries extend cruising time by a factor of 2 over the lead-acid batteries.

VIEWING: Seventeen viewports throughout the vehicle of 1.5-in. thickness, |D of 6 in.; OD of 8 in.

OPERATING/SCIENTIFIC EQUIPMENT: UOC, radio, echo sounder, magnetic compass, forward-scanning sonar.

MANIPULATORS: None.

SAFETY FEATURES: Pressure hull can be pressurized and flooded for escape. By blowing tanks or dropping ballast the following positive
buoyancy can be obtained: main ballast tank 200 Ib, trim tanks 400 Ib, weight drop 75 Ib. Main ballast tanks can receive air from ship or scuba diver
with air bottle.

SURFACE SUPPORT: Soo.

OWNER: International Underwater Contractors, New York.

BUILDER: Perry Submarine Builders, Riviera Beach, Fla.

REMARKS: Has not dived for several years, but can be available on short notice if required. Renamed TECHDIVER when purchased by its present
Owner.

173

ARteup

174

PC3-X

MAN Suns SoonconcnsoscpocossooUOoUDOUOOOOOboOGD 20 ft BATCHIDUAM EMER reegeteterstateteisisiatatnrotete ereteotet ers tetas 19 in.
BEAM ieee ateistclotetafotetclet hel vale l-b-t-fetatetet tela t=lielists(s/(so fein 3.5 ft RFE QUATRE NUE oSscenccnGossccsccmace 16 man-hr
TEKGRIUE ocoocscnrossoccassoosoososoDoMonocGoodoo 5 ft TROUZNE HOMERS coooscoctocesscccsssosoecscuss
DYSYNFUS coeooospoogcdsosc 3.75 ft SPEED (KNOTS): CRUISE

WEIGH (DRY) 25 ee -iete =o 4,700 Ib MAX

OPERATING DEPTH: 150 ft CERES sockcceocectrdoeeedeeesessooccsssse
COLLAPSE DEPTH: 500 ft OBSERVERS

EAUWNCHIDAMIES eretepe ic eretetetet=ni-yat-olme lela leiele «sia ial == 1962 EPANILOY NDS oosscoscotS Scene cessosos se ecososon

PRESSURE HULL: Composed of 0.25-in.-thick plate and heads of A285 steel.

BALLAST/BUOYANCY: Main ballast tanks fore and aft which are free flooding and blown by compressed air in four bottles (270-43 total
capacity) at 2,000 psi. Two variable ballast tanks fore and aft which are pumped dry to the sea or from one tank to the other.

PROPULSION/CONTROL: One, stern-mounted, reversible propeller provides all propulsion. It is powered by a 4hp, 115-VDC, 32-amp motor
enclosed in a separate water-tight compartment. Bow planes and rudder are hydraulically actuated by the pilot using airplane-type controls.

TRIM: Up/down bow angle can be achieved to a moderate degree by differentially filling the VBT’s.

POWER SOURCE: Six 6-V, lead-acid batteries rated at 210 amp-hr each are carried in a pressure-resistant compartment.

LIFE SUPPORT: NA.

VIEWING: Thirteen viewports located around the conning tower, 0.5 in. thick.

OPERATING/SCIENTIFIC EQUIPMENT: Magnesyn compass, echo sounder, two depth gages, CB radio, UQC, forward-looking sonar, transponder.
MANIPULATORS: None.

SAFETY FEATURES: Emergency breathing through scuba regulator off high pressure deballasting air. Pressure hull may be flooded for passenger
egress. External fitting to receive air from divers. Life vests.

SURFACE SUPPORT: soo.
OWNER: Applied Research Laboratory, Univ. of Texas, Austin, Texas.
BUILDER: Perry Submarine Builders, Riviera Beach, Fla.

REMARKS: This is the first Perry CUBMARINE considered a production-type vehicle (it was the third one built). |1t now dives occasionally in Lake
Travis, Texas. Its present owner has designated it the GASPERGOU. At one point in its diving history it was called SUB-ROSA.

175

CONNING TOWER

Vee BALLAST TANKS
PRESSURE HULL VIEWPORTS

RUDDER

BOW

MAIN PROPULSION THRUSTERS

MOTOR

HIGH PRESSURE AIR BATTERY COMPARTMENT SAT USLN Cen un TEN

176

PC5C

MEE NGG 5 cine cieie ee ewie sw le winnie ine civ wicle sire seis erie 22.3 ft HATCOIDIAMERERisgerer-ieletatairisrsietel sgogcDdaCoEt 23 in.
BENE sono ceeds eoocmoa boddccdo e@coninbo Coourercccs 4.1 ft LIFISSWUHRORT UNVAR9I8 on doc abencoucodocs got 180 man-hr
(nF Ssh esacobnoad odono coo oo ooo ODO OmooD Tealas YORHALL (HOMMERIE cn diogndcoonassecopogoococes . 16 kWh
LIRVAVFINY 6 ac.bneis Oho Dro-Ot8es COICO COICO A ECHO Mee 4.75 ft SPEED (NNO) s GRUISE cot atcetonasnnascunaes 0.5/4 hr
WWElGikhy (DERMIS conoonsobtooacouonoopcogoodd 11,450 Ib WAS aAonom oo8 Gon ooo Go 4 0 6-5/0-5)nf
QRWN EPs ogGotiGodesoponoonogo0ooUoO 1,200 ft CREW HEE OMS me reteptehlareleistelaisictotsielctsiatotct= fa) afc iahenet ied ae 1
GOILIVUN-SS DISPFIIAIS onpsoososecanccnggddopUnES 2,000 ft CEDSISEMISIIS coos eopackosnngo cena goeeooaso 2
AUN CHU ANT Esvimetateunitsheliaehelaetietetejnistelsiniakersiaysjeisieteiers 1968 IPANILOYND)S Gascon oonoosogo poss oodooOON DODO O dS 725 |b

PRESSURE HULL: Passenger compartment is a stiffened cylinder with hemispherical endcaps. Main hull and battery compartment is 0.5-in.-thick,
SA 212 grade B steel; conning tower and motor room are 3/8-in. SA 212 grade B steel; hatch is Almag 35 steel. Passenger, motor, and battery
compartments have separate, water-tight integrity.

BALLAST/BUOYANCY: Buoyancy contro! tanks, made of 18 gage, 304 stainless steel, are located within the hull and have a total capacity of 260
ib. A hydropump (4 gpm; 700 psi) can pump from tanks to sea or sea to tanks or bilges to tanks. The pump motor is a G.E., 120-V, 2-hp at 750 rpm.
Main ballast tanks straddle the pressure hull.

PROPULSION CONTROL: Stern-mounted propeller provides main horizontal propulsion and is driven by a 10-hp motor. Two bow and one stern
thruster of fractional hp are fluid-filled, and 36° trainable. Plexiglass bow planes assist in controlling underway vertical motion.

TRIM: A mechanical control system within the pilot’s compartment moves lead slugs fore or aft in trim tubes located in the battery compartment.
POWER SOURCE: Twenty 12-V, 67-amp-hr, 20-hr-rated, lead-acid batteries in separate water-tight compartment with nitrogen atmosphere and
provisions for purging. Power available to customer: 120 VDC. 100 amp; 12 VDC, 2 amp. Additional 4-amp invertor available.

LIFE SUPPORT: Three blowers supply air through three 4-Ib beds of Baralyme with 36 Ib carried in reserve for 52 hr of life support for three men.
Increasing to three 6-Ib beds of LiOH extends life support for three men to 60 hr. O2 supply is 50-ft3 bottles (ea.) at 2,000 psi carried externally.
Reserve supply of chlorate candles can be made available to provide 50-man-hr support. Three emergency regulators operate off the air system.
VIEWING: Eight horizontal and one vertical viewports in conning tower; 13 forward and 4 aft in pressure hull. Thickness of 1.5 in.; 1D of 6.3 in.;
OD of 8.0 in.

OPERATING/SCIENTIFIC EQUIPMENT: Magnesyn and gyrocompass, automatic pilot, depth gage and depth recorder, UQC, current meter, water
temperature sensor, altimeter.

MANIPULATORS: None.

SAFETY FEATURES: Can surface by blowing main ballast tanks or buoyancy control tanks at operating depth. Droppable keel; inflatable bag can
be filled with CO or gas generator. Cockpit may be flooded for egress. Three emergency breathing regulators are connected with vehicles’ low
pressure air system.

SURFACE SUPPORT: soo.

OWNER: Sub Sea Oil Services (S.P.A.), Milan, Italy.

BUILDER: Perry Submarine Builders, Riviera Beach, Florida.

REMARKS: Presently undergoing refurbishment.

177

178

PC-8B

LENGTH: .....-.. H HATCHIDIAMEMER sieatenteicrelslsjotctsterstetstefelstielotersi-teicis) aie 24 in.
BEAM: . WIFE SURFOR I (MERS osonoocbacgconbeagcade 48 man-hr
HEIGHT: MOA OWE Rimear.tatotetayeneiatatctetelsieleiaiale)s\ayetaletat r= tote 22 kWh
DISVNaUIR GopocooDDDOODOOGUDOGOUOCOOUDOOUOOUUOU SPEEDI(KNOMS) se RUIS Egetereretetetaletee ateteter siete ieierare 2/8 hr
(WENGE (DENS ssosoossongooge5psCsas0gcessDdS WARS oooooooUobCooDDd sooooOnOR 4/2 hr
OPERATING DEPTH: MAW (HI LMOUS oc ondodlacdosoood6uuedeonsordoddonSoNS 1
COLLAPSE DEPTH: OASIS cosochbsdboossucdonndeedeeooecse 1
LAUNCH DATE: ..... PENALOYNDE santos c00n00CooDDODODDOSOgCoooDddan 500 Ib

PRESSURE HULL: Cylinder with hemispherical bow and conical aft section composed of low temperature carbon steel 3.5-ft diam., 13.7-ft length,
and 3/8 in. thick.

BALLAST/BUOYANCY: Two main free-flooding ballast tanks straddle the pressure hull and are blown with compressed air. One variable ballast
tank (160-Ib capacity) in the pressure hull is free-flooding and pumped dry.

PROPULSION/CONTROL: All propulsion is provided by a stern-mounted, reversible propeller which is driven by a 7.5-hp, DC motor within the
pressure hull. Electro-hydraulic rudder and dive plane.

TRIM: No system provided.

POWER SOURCE: Lead-acid batteries are carried within two pressure-resistant pods beneath the hull and provide 24 and 120 VDC.

LIFE SUPPORT: 0p flasks are carried externally (four ea. of 72-43 cap., 2,250 psi). CO2 is removed by LiOH. Monitors for O2 and CO, altimeter.
Emergency breathing provided by two scuba regulators drawing off the compressed air for deballasting.

VIEWING: Plastic bow dome, 2.25 in. thick (114° spherical segment). Eight (8-in. OD, 6%-in. 1D, 2-in.-thick) viewports in conning tower and one of
the same dimensions in the hatch.

OPERATING/SCIENTIFIC EQUIPMENT: UOC, CB radio, scanning sonar, compass, automatic pilot, depth gage.

MANIPULATORS: One with three degrees of freedom.

SAFETY FEATURES: Droppable weight (450 Ib), MBT’s can be blown at operating depth. Fire extinguisher. Life vests.

SURFACE SUPPORT: soo.

OWNER: Northern Offshore Ltd., London.

BUILDER: Perry Submarine Builders, Riviera Beach, Fla.

REMARKS: Operating.

Ie

EXTERNAL RING STIFFNERS

PRESSURE HULL
PLASTIC

BOW
DOME RUDDER

COMPRESSED AIR

DROPPABLE
BATTERY POD

180

PC-14

LENGTH: .....00 weet tee c ert ett ete wt estes 4 VANIKClal IVAISTIEIR SonoonponboneondodecenUSoce6 19 in.
BEAM: ....... mie tatehstatatal=t=t=feteletershelalafalstalsinlsjie/elujfulelle)iele PIRES UPPORM (MAX) simclsicietntsistelalel=telet=felelel=iiens 60 man-hr
HEIGHT: .......... . TROUVAVL HOWMEIRE nodooonasogenoooudsoqscugG0n09 15 kWh
DRAFT: ..ccececaes . SEED (KMS 3s GRUISIS ccoooposcnocospeosooocodao NA
WEIGHT (DRY): .....--- IMVAOS Snood cansccdgonsooconDEoeo NA
OPERATING DEPTH: CREW -s RIE OM Si epete an siclerate|elals)-\a\e(=)n/ei=inielel=ie\l| seis) =lelsiniels)e 1
COEEAPSE/ DEPTH: <.. OBSERVERS eitetetetete te letel alate a¥etelat=tetel-tell=tet fe ielsitst=t= 1
LAUNCH DATE: ...... IMM ALCYNSE So odccocunO DOU DRO UOUUOOOU CU cota 1,100 Ib

PRESSURE HULL: Cylindrical shape with a conical aft section made of A516 grade 70 normalized steel 7/16 in. thick. Plastic bow dome 40-in. 1D
and 2 in. thick.

BALLAST/BUOYANCY: Two main ballast tanks straddle the hull, these have a capacity of 200 Ib each and are blown dry. Variable ballast tanks to
obtain neutral buoyancy submerged have a capacity of 100 Ib.

PROPULSION/CONTROL: Main propulsion is from a stern-mounted propeller powered by a 36-VDC, 7.8-amp, G.E. motor in the hull which drives
a 0.5-hp hydraulic motor to actuate the propeller. Propelier is reversible and has three speeds forward and reverse, Manually actuated dive planes and
rudder,

TRIM: No systems provided.

POWER SOURCE: Within a droppable, pressure-resistant cylinder are twelve 12-V, lead-acid batteries which provide all electrical power.

LIFE SUPPORT: Four 0 flasks within the hull. O2 flow is controlled by a flow meter. CO is removed by LiOH. Monitoring devices for O2, CO?
and hull pressure,

VIEWING: Plastic bow dome forward. Six plastic viewports on conning tower sides and one in hatch cover of 7.5-in. OD and 6.5-in. ID.
OPERATING/SCIENTIFIC EQUIPMENT: UOC, directional gyro, CB radio, depth gage.

MANIPULATORS: One with four degrees of freedom.

SAFETY FEATURES: Main ballast tanks can be blown at operating depth. Battery pod droppable. Emergency breathing off compressed air. Life
jackets,

SURFACE SUPPORT: Presently operating off the R/V GYRE.

OWNER: Texas A & M Univ., College Station, Texas.

BUILDER: Perry Submarine Builders, Riviera Beach, Fla.

REMARKS: Operational. Redesignated D/APHUS by owner.

181

ROLEX

SURFACE
PORT MOTOR CONTROL RADIO ANTENNA

HATCH

EMERGENCY REBREATHER
= a DEPTH SOUNDER
——_,

CIRCUIT BREAKERS

UNDERWATER PHONE
TRANSDUCER

OXYGEN REGULATOR

AND VALVES
MACHINE CONTROL

wae, oP chads ce

1B EL) | SURFACE
Si

os f BUOYANCY TANK
Ai

OXYGEN TANK

PORT
AIR TANK aw
STARBOARD ° 1000 W LIGHT
(QUARTZ IODIDE)
OIL
RESERVOIRS NAVIGATIONAL
INSTRUMENTS
syovancy sas
LIGHT

COMPENSATING
OIL BAGS FIXED
BATTERIES MANIPULATOR

PROPULSION MOTOR (2)
CAMERA

SONAR VIEW PORTS PORT

CONTOUR FOAM CUSHIONS DROP WEIGHT

182

PISCES |

PEIN CUES tretctsteYelefebelot=tetet=tol -lelatetataiereKele/slsleleleleleiateleletele 16 ft BATCHED AMES ER aitersletatsisfotel«latsieteretal=lelelalelaiei=ia) ofee 18 in.
ESA citatia etal alatiafelintaielielni=ielstistnfolsiainintsielclalelalsiafelelslsislshaia 11 ft PIP RISUPEOR TMA) camtetstolelstereirictelerelensiersisierle 100 man-hr
inlEKelanre- aoasoondenags aes ccc ec asiascicevcevcevs 10 ft MOMMA LOWER: ie vovelelatelalsyeletava(olaralstavaletelalaloyatsver vate
DGVNFITE. cao co cn Dodo DAO DUCOOODOUD ODODE OOO OOOoS Zoot SPEED (KNOTS): CRUISE

WENGE (DIRNOR saossoocccdcagasononoood 00000 7.5 tons MAX ..

OPERATING DEPTH: ........ . 1,200 ft CREMIEIE OS motetelalelslalonoloratalaletotat-isieraielersisicictetersnsiekencicns
OVI LNT DISPUTE soasousosededosocdcadassse 3,600 ft OBSERVERS

LAU a) BYNES sosdgogcenesossusoscdacogcensods 1965 AL HOVANO) Soho sooooa6

PRESSURE HULL: Spherical shape (two hemispheres), of Algoma-44 steel, 0.75 in. thick and 6.5-ft OD.

BALLAST/BUOYANCY: Thirty gal of oil are carried in a hard aft sphere which can be electrically or manually pumped into flexible bladders at
ambient pressure. Pumping oil into the bladders increases buoyancy at a rate Of 64 Ib for each ft3 of water displaced. A total of 300 Ib of positive
buoyancy may be obtained with this sytem. On the surface high pressure air can blow clear a circular tank surroundirg the upper half of the pressure
hull and add a total of 2,000 Ib of positive buoyancy to increase freeboard.

PROPULSION/CONTROL: Two 19-in. propellers mounted amidships on each side the vehicle provide forward or aft movement in the horizontal.
The propellers are driven by two oil-filled, 5-hp, DC motors which can control screw rotation from O to 1,200 rpm in either direction.

TRIM: Up/down bow angles of + 15° can be attained by moving the lower battery pod fore or aft by a hydraulic arm.

POWER SOURCE: Lead-acid battery pack (60 cells) in an oil-filled, pressure-compensated aluminum box rated at 500 amp-hr.

LIFE SUPPORT: 05 supply is carried internally in a 50-ft3 tank and is manually bled into the hull. CO} is removed by LiOH.

VIEWING: Three viewports looking forward and slightly downward of the horizontal. The two large ports are 6 in. thick, 6-in. 1D, 13-in. OD
providing approximately 48° of viewing each. A smaller viewport is located slightly above and between the two large ports for photography.
OPERATING/SCIENTIFIC EQUIPMENT: UQC (8-kHz), echo sounder, directional gyrocompass, TV, obstacle avoidance sonar, VHF radio, seawater
temperature indicator, depth gage.

MANIPULATORS: One arm, six degrees of freedom, of 82-in. total reach and 150-Ib lift. A second clamping arm is available which has three degrees
of freedom, a jaw opening up to 21 in. and can rotate 360° at the writst. Jaw clamp is capable of lifting or pulling 400 Ib.

SAFETY FEATURES: 0,5 rebreathers (two ea.). Mechanically jettisonable, 400-Ib weight. Surface buoyancy system can be employed in an
emergency while submerged. Mechanical arms jettisonable.

SURFACE/SHORE SUPPORT: VICKERS VOYAGER & VICKERS VENTURER.

OWNER: Vickers Oceanics, Barrow-in-Furness, England.

BUILDER: International Hydrodynamics Ltd., Vancouver, B.C.

REMARKS: Operational. The basic details, e.g., length, beam, height, etc., are taken from a recent brochure from the current owner; the remaining
data was obtained primarily from the builder and may be incorrect as the vehicle now stands.

183

RADIO ANTENNA

STABLIZING FIN
UNDERWATER
TELEPHONE

TRIM SPHERE

MACHINERY BALLAST TANK

SPHERE
OXYGEN
BOTTLE

VHF RADIO

BATTERIES

PROPULSION

MOTOR
\a a\
(wor V7 spnipuraron
SY as
HANDLING SKID a —— ECHO SOUNDER
VIEW PORT

SONAR CONTROL CONSOLE
=

AIR PURIFICATION UNIT

184

PISCES Il & III

LENGTH: ...-.--eeeees care e eee se see see rere rcs 20 ft
HSA Son couDoUCUoDODOODO OC DUCOOUCODTOOCODtOG 10 ft
TEKH Soooodd BeIScciceOmiCmce Cc ice icici icine 10 ft
DRAFT: wc cece ence cence cence ccc e set ccssesces 7.5 ft
WEIGHT (DRY): we teeee e+ 12.5 tons
QMHERVATMNG DEP uink PUUE oh cocodocsgoandoocddad 2,600 ft
HINES sooasgoccncaoesd0dds 3,600 ft

COREARS Ea DE Palit iitetetatetaict=tetorsiotetotatefel-re)elotsfale tel 5,000 ft
YNUCl IYAIHES TFITE cococobnocomdcngonconddUdGS 1968
FAM Sivepstatecapatels efexeretsintetataleyalsreelatatsts 1969

IRVAIREL A) OVA MIEIKESIRR: aon boocancdedsonnocuosobuN 19.5 in.
LIFE SUAFORIPUMVACE ssooomceanosdgsoo coe 100 man-hr
THON LIFOUMEIRIE sonccoosospognenosre eas aegaoo 40 kWh
SEEEDMICNO MS) CRUISE miatatelststetelefetelalar=ielstel =) ie) cneietets NA
WARS soaa cocunuconaneoaescodoHoods a

CIRMEINES IPULOUS ssaccsonopcontood0csoo gob acooedbos 1
OBSER MER Satetetetetstelat tele iet-tet=tet=t-t-ta\alat- t-te tele teats 2
PENALOYNDR proaadesnenoddooondonogacauscdDONS 2,000 Ib

PRESSURE HULL: Spherical shape, two hemispheres of A242 welded steel segments 1.1 in. thick; 6-ft 8-in. OD.
OPERATING/SCIENTIFIC EQUIPMENT: UOC, depth gage, echo sounder, directional gyro, transponder, TV, scanning sonar/interrogater, VHF

radio.

MANIPULATORS: Two; one is for grasping (three degrees of freedom) and one for working (six degrees of freedom). Both can be adapted to carry
drills, impact wrenches, grinders, mud pumps and cable cutters which can be changed underwater.

SURFACE SUPPORT: Both are supported by the M/V VICKERS VOYAGER (4,500-ton displacement) or the VICKERS VENTURER (640-ton

displacement). The former is an ex-fish factory ship; the latter an ex-stern trawler.

OWNER: Vickers Oceanics Ltd., Barrow-in-Furness, England.
BUILDER: International Hydrodynamics Ltd., Vancouver, B.C.

REMARKS: The features given above are from the present owner, features not described parallel those of PISCES | when both PII & Pill were first
constructed, Considerable modifications have taken place since the present owner acquired these vehicles.

185

186

PISCES IV & V

UAC: poscooooodd Seateletsiatstaliatalallsielaletel'el<ielts|iaitstal leis 20 ft
HSA GoboocgnddncocoonaoD misksveleistarele(siafetelohelclevate 10 ft
FREG TA secketeatuvalateistallsifessievs/alafei=\atensleteieiele\eleisieratars ie ies 12 ft
ERVAIRiirexreletere mintelniisvelsfatsielsieiieie mialepselevuiisl sale issn atern 8.75 ft
WETEIRITT (OEE. scosooncenddovcoéeuudooccudadod 10 tons
QPESRVATINKSIDE AWS sosapoccacsococonouDCOUOE 6,500 ft
COLINAS IEPUIRS oaocoansodooc pound andonoMmS 9,750 ft
LAUNCH DATE: ........- mpotiets| aletuveleleiaixtetelstelal's 1971, 1973

BATCHED IAM Ent Fp-taterdisfatctateialetelcveretetetetetsrctevelerstete 19.5 in.
IPE SURROERT (QUAY QS cuscaoaecnossccoooKdacd 76 man-hr
MOMALSPOWE Riera stetevercraravelaveusiorene ereta a) otatel evecare 70 kWh
SPSS kNensys CHUNISE senoospospancseudeadas 2/6 hr
WARS iG chock ocogeducgneooUDID OOS 4/3 hr

GREW-IBNE OMS warateiaichetatedolereie eter cneliet ence te ycieiecorsnevevsiara ileiave 1
OESSEMWERS scoccosotsovcotpooootousnedeoda 2

PAN IEOA Drtareccernorernertercnstcieneiotoelensvarets 1,500 Ib (Incl. crew)

PRESSURE HULL: Spherical shape of HY-100 steel hemispheres 1.1 in. thick, 6-ft 8-in. OD.
VIEWING: On PISCES II, III, |1V and V there are three viewports one looking directly forward, and two looking slightly port and starboard of the
centerline a few degrees below the horizontal. All are 6-in. 1D, 14-in. OD and 3.5 in. thick.

OWNER: PISCES IV: Canadian Department of Environment, Victoria, B.C.

PISCES V: P & O Intersubs, Vancouver, B.C.
BUILDER: International Hydrodynamics Ltd., Vancouver, B.C.

REMARKS: Operational. PISCES IV, V fall under the same constraints as the descriptions for PISCES I & III.

187

188

PS-2

EENGiititietetetert= 7 VAT) PIVAWIETERE = onconooapoooctosgsonooboosns NA
BEAM: ..cc ccc ccs ceneees LIFE SWAHOEATS concccosaocnoococecupododod 72 man-hr
EMER odode TOTAL IHONMERE sooacs don nconc0d0Gcod Doo OgdoS 17 kWh
DRVNFUE cococcnocconMapsoanocUuDDDODUDoOOEDdOOUUS SPEEDIIKGNOMS) CRUISE mre ateict=tal-leletalsteretiaieteiteveke NA
WEIGHT (DRY): WW Gorsatsocacsaosaesccsasccos NA
OPERATING DEPTH: CREW SPIE Ons moervaleystetetelatstsketoiaiofeheionaValctsisieteke tol ohatol-rs terete 1
COLLAPSE DEPTH: = CESSRMERS sooscocng0dccnsuncDscoDconNOOnC 1
EAUNCHI DATE: er. ses PAY MOA D cmacteteterelcieletelalatelolsietelsfenctetetetet=feyen=t-rat=)- tar 1,000 Ib

PRESSURE HULL: Cylindrical shape of ASTM A-516 grade 70 steel, 42-in. diam. and a 28-in. diam. conning tower.

BALLAST/BUOYANCY: Buoyancy is obtained through a soft tank which is pumped full to provide positive buoyancy or emptied to obtain
negative buoyancy.

PROPULSION/CONTROL: Main propulsion is from a stern-mounted propeller driven by a variable-speed, reversible, DC, 7.5-hp, electric motor.
Low speed maneuvering is provided by a thruster which can be mounted vertical or horizontal. Bow planes and a rudder are hydraulically controlled
to provide underway attitude control.

TRIM: No systems provided.

POWER SOURCE: Two pressure-resistant battery pods carry lead-acid batteries providing 120-V main power and 24-V auxiliary power.

LIFE SUPPORT: NA.

VIEWING: Six, 6-in. diam. viewports in conning tower and one 6-in. diam. in hatch. One 116° hemispherical bow window similar to PC-8 provides
wide angle viewing forward.

OPERATING/SCIENTIFIC EQUIPMENT: UOC, (27-kHz), directional gyro, CB radio, scanning sonar, pinger, transponder, surface light.
MANIPULATORS: One with four degrees of freedom.

SAFETY FEATURES: Ballast can be blown at maximum dive depth. Droppable weight of 200 Ib, scuba apparatus for each passenger.

SURFACE SUPPORT: soo.

OWNER: Sub Sea Oil Services, S.P.A., 45 Via San Vittore, 20123 Milano, Italy.

BUILDER: Perry Submarine Builders, Inc., Riviera Beach, Fla.

REMARKS: Operational. Also known as TUDLIK when operated by Access of Toronto, Canada,

189

HATCH

FIBERGLASS
FAIRING HYDRAULICS

MOTOR

UPPER BATTERY BOX
é CONNECTING TUNNEL

COMPRESSED
AIR

FORWARD
SPHERE

VARIABLE
BALLAST

SECURING
STRAPS

LOCKOUT HATCHES
(INSIDE & OUTSIDE)
LOWER DIVER LOCKOUT

BATTERIES SPHERE

IVER’
vera (MOVEABLE)

GAS

190

SDL-1

(LENCE scodecaca Efeteforteteierckerercreceveveveicleterersiehersiela/a 25 ft HAT CHIDIAMEME Ret aictsicvci cic ote eraieexcis.0r8) ene fore sphere 25 in.
BEAM = Sissies cere ondoo dGoceunooo UO OO Ud mOOUOOUG 10 ft aft sphere 22 in.
FMEA Eli hememeteteterete) cfeterahet=fahetedsheletataretaisie oleletsis/epetslels\siehe 8 ft tunnel 22 in.
DISVNFUS Sood 5050 s0noanso nS SbocdooboOUMOBDOoOOUOD NA PIRES UPPOR Dn MADS) -itetaielsistatetslatels)srateli= tales ate 204 man-hr

WEIGHT (DRY): . 14.25 tons TROT NEIAONMIEIRG sacsoopososdobcogsonsegsocose 68 kWh

OPERATING DEPT 2,000 ft SHEED (UCNOTS AGREES oascscossnon0dngn5Ga5c 1/8 hr
COLLAPSE DEPTH: ...ccc ee scceseccerercccece 4,000 ft MAX ior akeratiolelinle¥s alate nile ls) sfetaleveieberaet= 2/4 hr
EAUNCHI DATED 2 ccc cc ccc cca anes ete ane sicecies 1970 CREW SPT OMS ere ietetaleta tole tote ifedelie fal =] <U-hn)'=ielin/=hey=\=2=V1 =ifa\/atin) alt= 1
OBSERVERS merarerereiee-tateie terol satel hele) feneiaiaketelotataleieks 5

PHEW LOVADIE oo sag conn d obs dns ose Sot ooSdeoues6 1,300 Ib

PRESSURE HULL: Two spheres joined by a cylindrical tunnel. All hull components are of HY-100 steel. Forward hull is 7-ft OD and 0.481 in.
thick with an overhead access hatch, Aft hull is 5.5-ft OD; 0.387 in. thick with a bottom diver lock-out hatch. Connecting tunnel is 25-in. 1D; 71 in.
long and 0.75 in. thick (Identical to BEAVER hulls.)

BALLAST/BUOYANCY: Main ballast tanks forward and aft which can be blown at 2,000 ft to supply 7,000-Ib lift. Two variable ballast spheres
(tanks) hold approximately 780 |b of seawater and dre filled and emptied by a pump. In the event of pump failure the VBT’s can be blown dry. Two
lead blocks each weighing 350 Ib can be dropped in the event of an emergency. Syntactic foam provides additional positive buoyancy. A
hand-operated bilge pump is in the diver’s compartment.

PROPULSION/CONTROL: Two, 5-hp port/starboard side-mounted, reversible, variable-speed thrusters provide lateral maneuvering. Thrusters are
fixed in a horizontal position, but may be operated independently to provide maneuvering about the vertical.

TRIM: Bow angles of +30° can be obtained by moving one of the battery packs and droppable lead weights fore or aft. Movement is accomplished
by a hydraulic pump.

POWER SOURCE: Externally-mounted, pressure-compensated, lead-acid batteries supply 60, 120, 12, and 28 V from three separate banks totaling
495 amp-hr. Emergency power is from two 15-V nickel-cadmium batteries.

LIFE SUPPORT: 03 is carried externally in a 750-SCF, 3,000-psi tank and internally in two 60-SCF tanks. Each sphere contains a CO? scrubber.
Oy is controlled automatically and partial pressure is constantly monitored in both spheres. CO 2 is monitored with a Drager system in the forward
sphere, as is temperature and pressure.

VIEWING: Ten acrylic plastic viewports (identical to BEAVER).
OPERATING/SCIENTIFIC EQUIPMENT: UQC, scanning sonar, up/down sounders, aircraft gyrocompass, two depth gages.
MANIPULATORS: Two; one is articulated, the other is for grasping.

SAFETY FEATURES: Hydraulically jettisonable weights, motors and manipulators. Pinger, flashing surface light. Emergency breathing masks, fire
extinguishers, VHF radio transceiver, pinger.

SURFACE SUPPORT: soo.

OWNER: Canadian Forces, Halifax, Nova Scotia.

BUILDER: International Hydrodynamics Ltd., Vancouver, B.C.

REMARKS: Operational. The pressure hulls of this vehicle were originally intended for a second BEAVER, but these plans never materialized.

191

SIDE PROP (2 PORT & STBD.)
MAIN BALLAST TANK (PORT & STBD.)

CTFM
PROPELLER VB BAGS SCANNING
STEERING (2 INSIDE BALLAST TANK) SONAR
LIGHT
Tv
AUX. MOTOR
MAIN
PAN & TILT
AIRBOTTLES
(3000 PSI)

MANIPULATOR
SPHERE (2 PORT & STBD.)

RELEASE FWD HYD. TRIM TANK
WEIGHT DROP (2 PORT & STBD.)

AFTER HY. TRIM TANK
(2 PORT & STBD.)

MAIN BATTERY
ELECTRICAL (2 PORT & STBD.)

DISTRIBUTION
CENTERS HYDRAULIC (CENTER LINE)
(2 PORT & STBD.) CANNISTER VB (STBD.)

192

SEA CLIFF & TURTLE

nV) (IVAN s660sno0nnsomscasonoopobes

LENGTH:

BEAM: LFS SUA UV NE oaocacocemoopcanconoUr
HEIGHT: TROnVNCTHOMMEIIS Geoookon eke doboncnopposdospend
DRAFT: SPEED (KNOTS): CRUISE

VUSUGTRIE WSIEINQIS Gocdcoore coco 0 bcm Comet ro oc 24 tons MAX

GRERATINGIDEPTE cence crerecyers ole eee ee ocvene « 6,500 ft (OL MIEMURIFIILOR IST so aomoo

COPIBAIPS Es DERI) oc rrenelle elle) oe el olloi= «tniet stain osfoltel «saie)™ 9,750 ft OBSERVERS sie esr

LY N(UINKEIR MEY SS Sooeecononboso roo mny oo Od orm eas 1968 [PAWALCVND apoachonoeconepocanoonU Oooo eu OuaTODS

PRESSURE HULL: Spherical shape of 1.33-in.-thick, quenched and tempered HY-100 steel. Sphere is 7-ft OD of two welded hemispheres which
thicken to 3.5 in. at viewports. Entire sphere stress-relieved.

BALLAST/BUOYANCY: The submersibles descend by flooding the two main ballast tanks and partially emptying the two variable ballast oil-filled
bladders into the four variable ballast tanks. This variable ballast system is the primary ballast control for diving and surfacing. The variable ballast
system can attain a buoyancy differential of 880 Ib. The two main ballast tanks are used primarily to gain freeboard while on the surface.
PROPULSION/CONTROL: A single stern shroud and propeller and two side propulsion units are the principal propulsion systems. The stern
propeller is powered by a variable-speed, hydraulic motor and can be trained through 45° deft and right. The side pod propulsion units are powered
by reversible, variable-speed, DC electric motors and can be trained together through 360° by an electric motor. The three motors and reduction
gears are encased in a pressure-compensating Oil environment and can be operated in three modes: stern propeller alone, side pods alone, side pods &
stern propeller together.

TRIM: Up/down bow angles of +25° are obtainable by transferring 540 Ib mercury/oil fore or aft to three (two forward & one aft) small fiberglass
spheres.

POWER SOURCE: Electrical power is supplied by two 60-V and two 30-V, pressure-compensated, lead-acid batteries. The 60-V batteries have a
total capacity of 500 amp-hr at a 6-hr discharge rate; energy stored totals 30 kWh. The 30-V batteries also have a total capacity of 500 amp-hr ata
6-hr discharge rate; energy stored totals 15 kWh. Power is available as: 120 VAC, 60 Hz, single phase; 120 VAC, 400 Hz, single phase; 60 VDC; 30
VDC; 24 VAC, 40 Hz, three phase (fed directly to gyrocompass). Two 30-V, silver-zinc safety batteries located within the personnel sphere have a
total capacity of 12 amp-hr ata 1-hr discharge rate.

LIFE SUPPORT: 02 is carried in a 0.6-ft? tank at 3,000 psi. LiOH is used to remove CO2 by air blown through cannisters at 7 SCFM.

VIEWING: There are five viewports, four in the sphere and one in the hatch. The four main viewports are oriented one dead ahead, two (one each
side) on the port and starboard quadrant at an approximate 40° declination and one on centerline looking downward at approximately 80° from the
horizontal. The main ports are 3.5 in. thick with an ID of 5 in. and an OD of 12 in. The fifth smaller port is located in the center of the hatch and is
used for obstacle avoidance and ambient light observations, it is 2 in. thick, has an 1D of 2-1/8 in., and an OD of 6 in., anda 45° angle of view.
OPERATING/SCIENTIFIC EQUIPMENT: UQC (8.087-kHz) Two closed-circuit TV cameras (one mounted on pan & tilt mechanism the other on
starboard manipulator), gyrocompass, depth indicator, altimeter, speedometer, odometer, CTFM sonar, electromagnetic log, inclinometer, echo
sounder.

MANIPULATORS: Each submersible is equipped with two identical manipulators. Each manipulator can be equipped with tools to perform varied
tasks such as drilling, cable cutting, and grasping of objects. These tools are stored in racks on the submersible and can be interchanged during a
mission. Each manipulator is capable of seven degrees of freedom.

SAFETY FEATURES: Emergency breathing apparatus (3 man-hr). Manipulators jettisonable. The three banks of batteries weighing 3,400 Ib can be
dumped. Ultimately, the personnel sphere and buoyancy ring can be separated from the rest of the vehicle from within the sphere; its 1,800 Ib of
positive buoyancy will float the sphere to the surface. Emergency power in pressure hull.

SURFACE SUPPORT: Air (C5A), ship and truck/trailer transportable. Presently launched/retrieved at sea aboard a leased offshore work boat of
164-ft length, 198.4 tons and equipped with a 100-ton-capacity non-articulated crane.

OWNER: U.S. Navy, Submarine Development Group-One, San Diego, Calif.

BUILDER: General Dynamics Corp., Groton, Conn.

REMARKS: Both operational. These vehicles were originally designated AUTEC | & II. The Navy’s numbered designation is DSV-3 (TURTLE) and
OSV-4 (SEA CLIFF).

193

LATERAL

BALLAST TANKS
THRUSTER Z

MAIN
PROPULSION

VERTICAL
THRUSTER

IEW PORT
SEES PRESSURE

HULL BATTERY

EMERGENCY
WEIGHT

194

SEA OTTER

(Y= Keniink socgacosvosnuuoGboDO dU coo Ooo oodOn do 13.5 ft IVI IOWANMISUISI ootdcbonassocodmoaeqgoncd0dn 19 in.
BEAM: LIFE SURRORT (INVAYSS soovsdodcosncndohoond 192 man-hr
ISN socoeneoagedoandapooeo boouoa0 too oGoURD 7.2 ft VOILE IFOWMSING Soboone coo gonsenedoaco onan 13.8 kWh
DRVMRUE 50 Coon JOCUUO CO OUD OOD oeo. Up co0 C0 Da 5.5 ft SPEEDICNOS) ACh |S Eamerereiehietetetetet-ieiaaetan-hetentststen= 1/6,hr
MWeorhrWeinhos nosoocoundogoobodeoobo sco cod 3.2 tons AAO are ratetestollereifenetisselaietagsiensisvaratallorene 3/1.5 hr
OPERATING DEPTH: ...........022+-2-++22- enue 1,500 ft CHEE IPILOUNS sacscoscdgoocadosaobdneduddaOODODDIO 1
COMEAPSEIDIERMHE cieteternrete!=seieaielele) eis) eles! eee si == 3,650 ft ORDISAWSES sosogoccsoondnooongnoegeococnOD 2
EAUNCH DATE: 22. ce ce ee eee e et ena 1971 IMAMILOVAN DS Soorngoosceocoupeconoescudocnnodoooo4 550 Ib

PRESSURE HULL: Two 0.625-in.-thick, section welded, mild steel, hemispheric sections are welded to the ends of a 0.75-in.-thick, 57.0-in.-long,
48.0-in.-wide, mild steel cylinder, with a 0.75-in.-thick, 19.0-in.-diam., hatch tower welded in with double plates to the pressure hull.
BALLAST/BUOYANCY: Launched positively buoyant. Buoyancy is controlled by two 250-lb main buoyancy air/water ballast tanks and two
62.5-lb forward trim air/water ballast tanks, The tanks are alternately flooded and vented for descent, ascent and trim as required. Venting air is
supplied by a 500-ft3, 3,000-psi air flask.

PROPULSION/CONTROL: A 3-hp, DC motor drives a 9-in. by 15-in. propeller for main propulsion. Two %-hp, DC, horizontal thrusters located
fore and aft provide steering along with a hydraulically controlled rudder (mounted on the main thruster) which serves as a trim tab for use in cross
currents, A %-hp vertical thruster is mounted forward. All thruster and main propulsion motors are air compensated. A Kort nozzle surrounds the
stern propeller.

TRIM: Bow angle and fine trim are controlled by high pressure (3,000-psi) air and water in either the main or forward ballast tanks.

POWER SOURCE: Twelve 2-V lead-acid batteries provide 13.8 kWh. They are located inside the pressure hull and are equipped with catalyzers to
eliminate H2.

LIFE SUPPORT: Three 40-ft3 tanks of medical grade 02 supply the life support system. Scrubbing of CO2 is accomplished by recirculating air
through a 6.4-lb LiOH cannister. Three cannisters provide 192 man-hr of available life support on each dive. CO2 and O2 percentages along with
atmospheric pressure are monitored. A backup emergency breathing system (air supply through mouthpieces), is also provided off the high pressure
air.

VIEWING: Four viewports are provided forward for the pilot and passengers, with two viewports along the side to accommodate reading
externally-mounted instruments. Three viewports are located in the hatch tower, providing 270° of viewing and one viewport is located in the hatch,
providing visibility toward the surface.

OPERATING/SCIENTIFIC EQUIPMENT: Two underwater telephone systems are provided (27-kHz primary, 42-kHz secondary). A directional
gyrocompass and a narrow, horizontal bandwidth, 27-kHz receiving antenna are provided for navigation along with five air-compensated lights
totaling 1.5 x 106 cp of illumination. Also provided are external depth and temperature gages, a pressure gage, a Hydro Products 400-exposure
70-mm camera and strobe, 16-mm cine camera with a capacity of 400 ft of film and a video camera with both audio and video recording capabilities.
A 23-channel CB radio is provided for surface communication and direction finder location. A 27-kHz pinger for location, tracking and
diver/submersible rendezvous operations and a upward/downward-looking echo sounder.

MANIPULATOR: The Beaver MK! Manipulator gives all the degrees of freedom of the human arm and hand plus 360° of rotation at the wrist and a
wrist extension. Additional tools are available and can be provided on the manipulator for specific tasks. An ‘A’ frame which is hydraulically
controlled is also provided and is utilized as an attachment point for core samples, cable cutters, collection basket and many other simple tasks and
applications as required.

SAFETY FEATURES: A 200-Ib, mechanically-releasable, emergency ascent weight. A releasable buoy and messenger line that can be released by the
pilot through a thru-hull penetrator. A magnesium release pin is used to provide release if the pilot is incapacitated. The messenger line is used to
send down a self-locking clamp and lift line. The submersible can be retrieved even if flooded. Eight hours of emergency breathing air is also
provided. Xenon light, life vests, fire extinguisher, distress rockets, CB radio, emergency food rations.

SURFACE SUPPORT: Can be transported by aircraft, ship, truck, or trailer. Submersible is normally on a trailer and can be launched from small
boat launching ramp. Can be towed at 4-5 knots. Tows completely submerged.

OPERATORS: Arctic Marine, Ltd., North Vancouver, B.C., Canada.

BUILDER: Anautics Inc., San Diego, California.

REMARKS: Operational. This vehicle was originally PAULO |, it was purchased by Candive of Vancouver, B.C. and is now leased by the present
Operator.

195

pS

SS ©

Pane,

PRESSURE
HULL

VIEW PORT MAIN

PROPULSER

VERTICAL
THRUSTER

BALLAST TANKS

196

SEA RANGER

KEEN Gilets ore retretetaneheiuitetelte sfece jel eqaislisniciecs cc)» isha; eile nie tslain\ sane 17 ft VITA) (IVAMISINERIE soonquonocdndonodubooboesoS 20 in.
BEAM ipererartenetareloiahekelalel ole) elivle(ellaisininl<Gs\elelielelekeleleiietetee isi = he 8 ft FE SUATORIN MARYS cb cacadcodcodeonesane 120 man-hr
RISIKCRATS shococecon coor pOnb Ooo nob OD odonuod 7.75 ft TOTAL POWER: ....... Recon pddoodadeaon aan 43.5 kWh
DDIAVNTIS. So oogopooo noob oooEE On OOOUUbOb UL Oo ddoUOOM NA SHZED (SIMONA RWIS soscnconconsgseanncocdu0s NA
WHENGRAr MDRNOE coodosdsodogn oo cnodom soon oe tonS 8 tons WV o@ocgoot ca scadgccgenbogasose4d 4
OPERATINGIDEPT cic. cece ce crete m we www woe wom 600 ft CHIEU FILS soovoodonncsasscnncopgspadnaodoenooK 1
(Soll SEle=rinads soacessoqcuscpogc0gegdGouGodug0G NA GIEDSISAWAEERY soogcodoocdgebncpacsooDcsanDoDO 3
LANUINTETRIBYMIFES: ogo doadooesoncdon EO OUsOGoc0o.0 O6 1972 PANAMOVND)A sonsocoucsacossegnosoboSagsoegas 1.25 tons

PRESSURE HULL: Cylindrical shape with hemispherical endcaps; composed of 0.5-in.-thick A-285-C steel, 16 ft long and 4-ft diam. Conning tower
is 2.25 ft high, 21-in. diam.

BALLAST/BUOYANCY: NA.

PROPULSION/CONTROL: Two stern-mounted (port-starboard) main propellers of 5.5 hp each. One stern-mounted 5.5-hp thruster provides
movement in the vertical. A 10-hp electric motor in the pressure hull and hydraulic pump operate propellers and thruster.

TRIM: NA.

POWER SOURCE: Lead-acid batteries mounted externally in a pressure-resistant tank supply 240 V at 180 amp-hr. A cable can be fitted to the
vehicle to supply surface-derived power if desired.

LIFE SUPPORT: NA.

VIEWING: Conning tower fitted with seven-7-in.-diam. plastic viewports, six circle the tower and one is in the hatch looking upward. Two
12-in.-diam. viewports are located in the forward hemihead (port/starboard) for forward and downward viewing.

OPERATING/SCIENTIFIC EQUIPMENT: Electronic compass, depth gage.

MANIPULATORS: Two manipulators. One is 6 ft long, has six degrees of freedom and can lift 200 Ib at full extension. The second is a telescoping
type with a clamping device to stabilize the submersible when necessary. The telescoping device is pivoted at the center of the vehicle and can drop
vertically to provide 2,600 Ib of lift.

SAFETY FEATURES: High pressure air can be blown into submersible to prevent flooding; 400-Ib ballast is jettisonable; the entire undercarriage
holding the propellers, manipulators, batteries and variable ballast tanks may be detached.

SURFACE SUPPORT: soo.

OWNER: Verne Engineering, Mt. Clemens, Michigan.

BUILDER: Same as above.

REMARKS: Operating.

ONG

AFT BUOYANCY
TANK MOTOR ROOM

AFT TRIM
CONTROL ROOM
(PRESSURE HULL)

TV CAMERA

PHOTO

vi EQUIPMENT

MECHANICAL
ARM

EXTERNAL
LIGHT FORWARD

IM
NEGATIVE ue

TANK

MAIN BALLAST TANKS

198

SEA-RAY (SRD — 101)

=EKetlai Saoonoensocooouodou dou do Cold UCoUCmOOOD 20.5 ft VAIN A) IVNMISUIEE Gonondoodnnodcucnancednoos4e 23 in.
HE/NMB ooncacgcoda cdc 20 COU O00 C0 O00 Ooo rp icra ton 5 ft EI RESSUPP OR Te UM ADC) i reretetelsiteis el=l-Uskei=t=!>ileliateiji="= 24 man-hr
SVENKGIRINS:) coseancon- todo NOOO OOOO OOMGUU COMIC UC 5:5itt TORING THOME chndaanndcodooonasscodgncoumaT 15 kWh
IDIRVNFIES soog pd dood sda toc don U CON SOO mOOOo A ooo de 3.25 ft SEEEDMICNOMS) aC RUIS Emr puctohlatelelcietelelsfelsler=uetatela) « 4/4 hr
WEIGHT (DRY): ...- 4.5 tons WARS GaoDpe boop con Kaoo.csaon bd on 6/2 hr
OPERATING DEPTH: 1,000 ft COMES (AILOUS socodaocconenguenesopoooboscongNoooO SS 1
COLLAPSE DEPTH 5,000 ft QPS RWSES sopcstosssosonsestonssense 1

1968 YAN IUGY NDS as, oe bed od 0 oe chs o oin.s Scomeo 5.5 400 Ib

PRESSURE HULL: Cylindrical shape with hemispherical endcaps, 3-ft diam., 17 ft long, 0.5-in.-thick steel. An 18-in.-high, 2-ft diam. conning
tower joins the hull.

BALLAST/BUOYANCY: Main ballast tanks for surface buoyancy. A separate tank which can be blown or pumped dry provides negative buoyancy
to submerge.

PROPULSION/CONTROL: A reversible, 2-speed, stern-mounted propeller provides all propulsion and it is driven by a G.E., 5-hp, 900-rpm, 36-VDC
motor. Rudder and dive planes are hydraulically-actuated.

TRIM: Up/down bow angles can be obtained by transferring seawater between a fore and an aft tank.

POWER SOURCE: Six, 12-V, 208-amp-hr, lead-acid batteries provide all power. The batteries are housed in a sealed compartment within the
Pressure hull.

LIFE SUPPORT: 0 tank carried within the hull. CO2 is removed by soda sorb. Monitors for O27, CO2 and a H2 detector. Silica gel carried to
reduce humidity.

VIEWING: Eight viewports 1.75 in. thick and 6-in. diam. Four are in the conning tower and four are in the bow.

OPERATING/SCIENTIFIC EQUIPMENT: UQC, gyrocompass, two depth gages, still and cine cameras, TV.

MANIPULATORS: One.

SAFETY FEATURES: Hull may be pressurized with compressed air for underwater egress. External fitting for resupply of air underwater.
Droppable keel. Negative tank can be blown or pumped dry at operating depth.

SURFACE SUPPORT: soo.

OWNER: Submarine Research and Development Corp., Lynnwood, Washington.

BUILDER: Mr. E. Crosby, Edmonds, Washington.

REMARKS: Operating.

199

VERTICAL THRUSTER INTER
LIFE SUPPORT GAS MEDICAL LOCK

STORAGE SPHER
VERTICAL ERE

STABILIZERS

BOW THRUSTER
BOW PLANES

MAIN MOTOR
< TRIM TANK

— HORIZONTAL

DROPPABLE BOW THRUSTER

BATTERY
COMPARTMENT

HORIZONTAL STABILIZER DIVER EGRESS HATCHES |

HIGH PRESSURE
AIR

200

SHELF DIVER (PLC4B)

aNchtglh sodsnoannoosoeso CODCOD OOODUDdOUUGUOUUGG 23 ft VATE ROIVANMISIISIR ncosdpocconnoucoUndcUdododK 23 in.
EVNME oc hooapongoeo oS ooo O oun BODO OOo IS 00000 G00 5.5 ft EIEESSUPPOR TCM AX) cirateleieteleleleleleleleletet-tet-le! le 172 man-hr
IEKEISHTS oo asenonheascenoenss geass esouonecnoG56 9 ft MOMALFPOWE RR gesretetetaletaf ae feliselotetatol stelinlsyellali=ieini=)=1<i(= 37 kWh
APN AS sod doa 0000.0 Opto Scho ero Oe EEO PCIe 6.7 ft SEEEDIIKNOMS) CRON Estate tele relele relate terelot=t-)-i-t=) i= t= 2/6 hr
(MEK iG WDENS seboosndnososbaocopeesoonuoode 8.5 tons WPS Go cdcDooD OOUsaD DOU oO GOpGS 3/0.5 hr
OPERATING DEPTS oe ccc eve cee ences were nis slew 800 ft CREAM NATEOUS) conccacs duocnoonooadooo cD CGCoddD IO. 1
COEPEAPSEI DERMIS (ere eyecelereyensrelisiierellsiefsic elu mite) s\lella/ 4) « 1,200 ft OBSER MER Siilets ete tetetete totaled tel atettela telat -Rellet-lelle ial tats 3
Ly NUN eI EY MAES soonnasogonscosusos aooeouonoog 1968 PAWALOV NDR. Sadognavocanoo one sWooO SUS OOOO eo ad 1,400 Ib

PRESSURE HULL: Consists of two cylindrical compartments 0.5 in thick with 54-in. diam., hemispherical endcaps. The hulls are A.S.M.E. SA-212
grade B firebox quality steel. The conning tower is made of the same steel but is 3/g in.thick increasing to 0.5 in. at the interception with the hull.
The conning tower is 28-in. OD and 19 in. high. Hatches are’ made of cast Ailmag 35. Gas sphere 0.5-in. HY-100 and HY-80 steel.
BALLAST/BUOYANCY: Two main ballast tanks, made of 11 gage mild steel, straddle the hull and provide 845 Ib of positive buoyancy. Two
externally-mounted high pressure air bottles of 440 ft3 total capacity supply air at 2,250 psi to blow the main ballast tanks.

PROPULSION/CONTROL: Main horizontal propulsion is provided by a stern-mounted propeller driven by a 120-VDC, 1,150-rpm motor. Bow
and stern thrusters are driven by a 2-hp, 120-VDC, 500-rpm motor. Bow dive planes assist in underway maneuvering. Additional assistance in
steering is obtained from vertical and horizontal stern stabilizers.

TRIM: Consists of one fiberglass tank forward divided into two sections of 380-Ib total capacity and a steel trim tank aft of 400-Ib total capacity. A
Hypro pump (6 gpm at 500 psi) driven by an electric motor can pump water from one trim tank to another and/or to and from the sea.

POWER SOURCE: Thirty-four V, lead-acid batteries of 95-amp-hr capacity each are located in an external battery pod. The batteries are at
atmospheric pressure in the 0.5-in.-thick, 6.5-ft-long, 2.1-ft-diam., 1,200-lb pod. The pod is droppable in an emergency.

LIFE SUPPORT: CO? is absorbed by two 12-Ib beds of Baralyme. Four externally-mounted bottles of O72 supply a total of 338 ft3 at 2,200 psi.
Blowers circulate air in both compartments. Diver’s gas mixture is supplied from a steel sphere of 33.5-ft3 capacity at 2,000 psi. Emergency
breathing from regulators in the vehicle is supplied from the high pressure air bottles used to blow the main ballast tanks.

VIEWING: Twenty-three viewports total, 15 double-acting in main hull, 8 single-acting in conning tower. Thickness of ports is 1.5 in., 1D is 6 in.,
OD is 8 in.

OPERATING/SCIENTIFIC EQUIPMENT: UQC, Magnesyn compass, depth gages, echo sounder, radio, scanning sonar.

MANIPULATORS: None.

SAFETY FEATURES: The following systems can be blow free of water or jettisoned: ballast tank 845 Ib, trim tanks 780 Ib, battery pod (weight in
water) 1,200 Ib. Emergency batteries in hull.

SURFACE SUPPORT: The vehicle can be carried on a truck, ship or an aircraft. It can be towed to the dive site or carried aboard its 85-ft support
boat.

OWNER: Operated by Inter-Sub, Marseilles, France.
BUILDER: Perry Submarine Builders, Riviera Beach, Florida.
REMARKS: Operational. Originally designated PLC4B.

201

WIRELESS

ANTENNA
NAVIGATION LAMP

TRANSPONDER
AUXILIARY TANK SONAR

VERTICAL STABILIZER

EMERGENCY
UNDER-WATER
MAIN TELEPHONE

PROPELLER

MANIPULATOR

—————————

VIEW PORT

HYDRAULIC PUMP

INVERTER EMERGENCY AIR FLASK

202

SHINKAI

HATGCHIDVAMEDMER i ssreicccte cierois’sicieretossis (Escape) 1/600 mm
BEN Gili cieerencnciatetctonctetetenat sl atotaleta!cl'etatelsdant == iq) =\'m\=)-ss0Vais 15.3 m (Access) 4/500 mm
BREA Mirae ganataterotteturon- tetera eterayetel a) atfereyal oite(elslelieojeler= euallote 5.5m CIR ESUPPOR Ta (MAX)i2)-, te iene ee eurcieente 192 man-hr
ELEN Gia tpmercterataieralcreersienteieteictiotakcteielelsi-t=leteletatelenel=ieivelete 5.0 m MOMALS ROWER sicrre; craton 2) cra) o) sues sits dovenei ey yale 200 kWh
IRV NTS. o 35 oC OOOO 00 ROSH CSCS OC COI oC OHnOIIO 4.0m SHEED) (KNCHAS CUE Soocacosécasesasaoue 1.5/10 hr
(WiSiGinhr (DROS ssésécecdncnso ss 0Coemeo cc aon 100 tons WARS cane goeadas goscoeoopoes oo 3.5/3 hr
OPERATING DER TES ete eietcicleretatescleicteietetere(=\107s) == s/s 600 m (CRE IHIMon Re? Shoc.dcmmoonged coduaomebooos eared 2
COPEAPSEI DERM ereccyere statede «relleielelecelele.e «ieiei=!=\ei= 1,500 m GOJISSAWISAS occocdssasesobecoonesacscsoccdes 2
EAUINGHID AM bcreleraier sy enersienet eter tel cletata = telalels! eles.» i0ls/ oie 1968 PEN AHOVNDYR Gc oguacouanngodceeooadoNHesoucaoGe 3,300 kg

PRESSURE HULL: Two spheres connected by a 1.45-m-diam. cylinder. Spheres are 4-m diam.; 36-mm-thick steel of 60-kg/mm2 tensile strength. A
spheroid espace hull of 1.7-m diam. is attached to an access trunk in the forward sphere.

BALLAST/BUOYANCY: Two tanks (300 kg each capacity) are flooded by ambient seawater and blown by compressed air. One tank is used to gain
fine buoyancy control; the other provides surface freeboard.

PROPULSION/CONTROL: A stern-mounted, reversible propeller driven by a 11-kW motor with range of 680 to 3,200 rpm provides main
horizontal propulsion. Two port/starboard, reversible, side motors are each driven by a 2.2 KW motor and can be rotated 360° in the vertical. A large
rudder and stabilizer fins assist underway stability.

TRIM: Provided by two tanks, one forward and one aft in the pressure hull, each having a capacity of 1,200 |. By pumping water fore or aft an
up/down angle of 5° on the bow may be obtained.

POWER SOURCE: Fifty lead-acid, externally-mounted, pressure-compensated, storage batteries of 100-V and 2,000-amp-hr capacity provide all
power.

LIFE SUPPORT: Interior is air conditioned to maintain 22°C temperature.

VIEWING: Five viewports: three in forward sphere of 120-mm |D and one on each side of sphere of 50-mm |D; all have a viewing angle of 90°.
OPERATING/SCIENTIFIC EQUIPMENT: UQC, radio, gyrocompass, speedometer, depth gage, echo sounder, obstacle avoidance sonar,
transponder, TV, stereo-camera, water sampler, bottom sampler, salinometer, water temperature sensor, seismic profiling system, light measurer,
current meter, magnetometer, gravimeter, heat flow measurer, depth/sound speed meter, radiometer.

MANIPULATORS: One.

SAFETY FEATURES: Releasable escape sphere, manipulator jettisonable, releasable lead ballast (2,100 Ib), automatic blow of ballast tanks below
Operating depth, life vests, fire extinguishers, surface lights, emergency air.

SURFACE SUPPORT: Towed to dive site by surface ship.

OWNER: Maritime Safety Agency, Japan.

BUILDER: Kawasaki Heavy Industries, Kobe, Japan.

REMARKS: Operational.

203

MAIN FLOOD
LIGHT

OPERATING
BALLAST

STROBE
LIGHTS

SURFACE
OPERATION PRESSURE
BALLAST HULL

PIVOTABLE
MOTOR

MANIPULATOR

DROPPABLE
CLOSE-UP WEIGHT DROPPABLE

STROBE BATTERIES

204

SNOOPER

(USINISUIAB soecoecn ooo Soe sesonobdene coded pon 14.5 ft BATCHED VAMES EG Rirmcyetererteterteneteieteleientetereloialaieestete 24 in.
SAME cop hon dooenousoudaguagDdnooD poo oun OOOUG 4.1 ft (LURES SURFORT (MAE oognodgesopndsoodcooon. 24 man-hr
RIENEIRNES coocaconncoognont acon bo nOtoou pod ao comO 7 ft VOUNE OMMERE combacccaoconooneooee aoe donac 9.7 kWh
DRVNFITS cosos bao DUoU DOU eo UD eo ooo CO OmUnn CaO UO oe. Soft GHA (SNOT) CRUISE aobntocoonaecdoongnscn 1/6 hr
CUENGIRTE I DIRSMS soodoncooonnod dp odnoddnsonaS 2.25 tons NWS Gennoootonoo book ood ood aod 3/4 hr
OPERVATUNKS DSP ins nodooo.ogcoeon den aod top ooo 1,000 ft CREWHIPIEOUS coscoododdoconsoooMoumooooucunDoS OA 1
QOL L/ARASEIDIEPUIne scosacsesasuo6n4dgbaoqeasecn 2,100 ft QIZSSRIWMEAS ssecnconsonooddoceoaasuesn65n38 1
LANUINIEIR BYATIES SacconoesoéuenosodondsadoognDodo 1969 RAMEOAD i eernnmrrcer rrr tcior tal aren vec r-weke scoters tepee ear 200 Ib

PRESSURE HULL: Cylindrical shape with hemispherical endcaps. Composed of mild steel (A-212) 0.5 in. thick and 36-in. OD on body and 24-in.
OD on conning tower. Cylinder is approximately 8.3 ft long, conning tower is approximately 2.2 ft high.

BALLAST/BUOYANCY: At launch vehicle is positively buoyant and made negative by flooding a small volume tank located on conning tower
fairing. A 12-ft3 capacity tank provides additional freeboard when on the surface. Both tanks are free flooding and open to the sea at their lowest

point at all times.

PROPULSION/CONTROL: One stern-mounted, reversible propeller driven by a 2-hp electric motor and capable of rotating 220° in the horizontal
Provides forward, reverse and lateral movement.

TRIM: No system included.

POWER SOURCE: Four 205-amp, 6-V, lead-acid, pressure-compensated batteries Mounted under the pressure hull provide main propulsion power.
All other power is supplied by two 100-amp, 24-V, nickel-cadmium batteries carried within the pressure sphere.

LIFE SUPPORT: 0, is carried within the pressure hull and CO, is removed by blowing cabin air through a Baralyme cannister.

VIEWING: Ten acrylic plastic viewports all 2.5 in. thick. Two viewports are 12-in. OD, five are 10.5-in. 1D and three are 8-in. ID.
OPERATING/SCIENTIFIC EQUIPMENT: UQC (8.072-kHz) range 6,000 yd. Two externally-mounted strobe lights for photography in addition to
12 flood lights of 250-W capacity each contained within four (three bulbs/dome) pressure-resistant pyrex domes. Vehicle was designed primarily for
Photography.

MANIPULATORS: One mounted forward of pressure sphere capable of two degrees of freedom and 8-Ib lift.

SAFETY FEATURES: Hand-operated, hydraulically-releasable 140-Ib weight. Mechanically-droppable battery pod (400 Ib). Pressure hull is
floodable to allow egress in the event of emergency.

SURFACE SUPPORT: Soo.

OWNER: Sea Graphics Inc., Torrance, California.

BUILDER: Sea Graphics Inc., Torrance, California.

REMARKS: Operational.

205

a RF ANTENNA

ENTRANCE

LIFTING EY
GEYE PRESSURE HULL

PLASTIC SHROUD

MERCURY TRIM

BATTERIES Be ee

PRESSURE HULL GYROSCOPE
> ~ Hy
ae LIGHTS

RUBBER CAMERA
BUMPER« & OT’s AND

PILOT'S AN

INTERNAL WATER ;
OBSERVER'S 7*~MECHANICAL ARM

BALLAST

WATER PUMP
FOR HYDROJETS
(NOT SHOWN)

MERCURY TRIM
BALLAST

BALLAST TELEPHONE SONAR

206

SP—350

BEN Gaited sirens vate teteltsKeleielat- felt fetelelelielisiteivlelet-)-(ei=\a/a/eio is) aleiale 9 ft HATCH) DIAMETERS creice cle elec wie © vleiels === =n)=i = 15.75 in.
[VA ss 6 Ga ciqeco OO OO OUT HO a6 OG ELS CO IOOChonD Cid ORC O oiErOIs 9 ft LIFE SUPPORT (MAX)2 200 cece ees ee cee = 96 man-hr
RES GEAiis eter a teraite nee totele reels) el elloie).elolei~i=leonsiieheidieleie! eis este’ se 5 ft MOMMA POWER iieteteleletefeleiot=)q)=fq)lafalal<)=(alelelielalisieln}s|ele 13 kWh
IDIRVNFIE aoocoods conc0 DOCU DOOCO OU OOO OIDsO coco 5 ft SPEEDN(IKNOMS) = CRUISE cia reiele erelalelelalai=t=1*)=1=1-1-)= 0.6/4 hr
WlelKetahr Walshe) osoccoonumou ocd 0d Ulmoueoomicdd 4.2 tons MAX 2c ccc cc cicie ce cee cieaies wens 1.0/2 hr
OPERATING DEPTH .......--- eee eee e cece enee 1,350 ft CREW: PIE OTS) once oie i0 0m 0 0)e 10's) el are) s)eje)eisiele| wie Ce) =iels =\eisJeis 1
COLLAPSE DEPTH: ......2--- ee ee eee eee recece 3,300 ft OBSERVERS i reratetetapeletate ofeleletelefallel =lelelfel sii-i>E=tnilteatn= 1
TEAWINGHIDAMIES Save eiers on 0 ele eiwie =n inieis.e sie siese ws siaioce 1959 BAWIEOAD aio eratel «fete =felarel=\e/ajialelal =e) elviiniis!=/alw lake) l= itso 300 Ib

PRESSURE HULL: Two, 0.75-in.-thick, forged, mild steel ellipsoids are welded together to form a 6.5-ft major diam., 4.9-ft minor diam. pressure
hull.

BALLAST/BUOYANCY: Launched negatively buoyant. Two 55-lb cast iron weights provide negative buoyancy at launch. When nearing the
bottom one weight is mechanically dropped and the vehicle is near neutral buoyancy. Fine buoyancy control is obtained by flooding/pumping
seawater in or out of a 12-gal tank. To ascend,the second 55-Ib weight is dropped.

PROPULSION/CONTROL: A 2-hp, DC motor drives ambient seawater through a hard plastic, 2-in.-diameter tube configured to terminate on port
and starboard sides at jet nozzles. Jets can be made to rotate 270° from straight forward (pointing aft) to the vertical. Water flow may be diverted
from one jet to another. Motor speeds are % or full.

TRIM: Bow angles of +30°from the horizontal are obtained by hydraulically pumping 275 Ib of mercury from one to another of two cylinders
located fore and aft of the vehicle. The forward cylinder is above the vehicle’s centerline and the aft one below,

POWER SOURCE: Six 120-V, lead-acid batteries supply 105 amp-hr of power for propulsion and lighting. Batteries are located external to the
Pressure hull and are pressure-compensated.

LIFE SUPPORT: Two 20-ft3 capacity tanks in the pressure hull holds sufficient O2 for 96 man-hr. Six perforated trays hold a total of 16 Ib
Baralyme to absorb CO}. Air is circulated by a fan to facilitate CO2 removal and is monitored periodically as is atmospheric pressure.

VIEWING: Two, acrylic plastic viewports 120° apart looking forward and slightly below the horizontal for pilot/passenger. These two ports are 3.5
in. thick, 4,7-in. 1D, 6.55-in. OD and provide overlapping coverage at 80° each. Between the two large ports is a 1.65-in.-diam. camera port. Three
wide-angle optical windows look upwards and provide 170° field of view.

OPERATING/SCIENTIFIC EQUIPMENT: UQC (42-kHz), gyrocompass, depth gage, up/down echo sounder, 35-mm external camera. Hydraulic
boom (5 ft extension) holds a 2,500-W light source for internal 16-mm cine camera.

MANIPULATORS: One mounted port side forward, hydraulically driven, with two degrees of freedom (shoulder/hand). Basically this is a pivoted
arm (rotating in one plane) which folds under the brow when not in use and is extended downward in the vertical to grasp. The vehicle itself can be
maneuvered to attain somewhat greater arm versatility.

SAFETY FEATURES: Inflatable conning tower around hatch for emergency surface exit. 400-Ib mechanically releasable weight. Trim mercury
(275 Ib) jettisonable. Scuba tanks inside hull for emergency breathing.

SURFACE SUPPORT: soo.
OWNER: Campagnes Oceanographique Francaises, Monaco.
BUILDER: Office Francais de Recherches Sous-Marine, Marseilles, France.

REMARKS: Operational. Redesignated SP-350 in 1970 following repressurization of all components to assure greater operational depth capability.
Also known as DIVING SAUCER, DENICE, DS-2, SP-300 and LA SOUCOUPE PLONGEANTE.

207

CT IE coor ay, -<iiparte ath wees a
aemame sane oe i. :

he

RADIO

PRESSURE ANTENNAE
HULL
STARBOARD LIFT 170° OPTIC
WATERJET PADEYE DOME

VIEWPORT

MAIN BALLAST TANK
(EXTERNAL)

FIBERGLASS
FAIRING

RUBBER BUMPER

BATTERIES BATTERIES
Bites (EXTERNAL) (EXTERNAL) <>
BROW PROPULSION

VIEWPORT MOTOR

DESCENT

MANIPULATOR WEIGHT

ASCENT
WEIGHT

208

SP—500

LIEICARIS Sooondcdoooconstoaccag oe men poN aon s 2.9m VATION MIEUEIRE omcénn Gomacuboudos aUmmeinoc.e 0.4m
HIEVNMIS ocsoscondGousondnnsetcoedenonenaeaodmas 1.93 m LURE SWUFRORMI (IMMA sce beoeohtoconeonenoue 12 man-hr
RIBNGIRATS os coochosoocgeeAooono sno oOsmoODOne OD 1.35 m I OMPAUSI ROWE IRIE ercaenerevssenaiterve ie foie coertesiaysi-ercioge lech avale sels 6.8 kWh
DVNFTS coctooo sb noo Deo Ado ooh noo dp ooReUeOoOOue NA SPEED UIsINCUNs GRUNGE socctoocosenccearaan 6 0.8/2 hr
WME MENA) osd5o066005 a0 0n000ondDG Ou OOdO 2,400 kg NAR io co-opococcdooaoso nb O00s 1.1/1.5 hr
(COPERVATINIG IDIEIFARIS oodososcsoonosdooneoponedd 500 m CREW: APINMEOMS Ser, torcccietcr sce cucvs ie cerehacereteusvarcvesepenemn levees per geet 1
GOWLNASE DEP socotaconasnsabdgbedscduCdS 3,000 m OBSERMERS marerstsrchemieletsiicisi-teloietersststene tener ie ie)
LAWNS IDAVINES ooasonsoocgoncmoonoonoaodonocod 1969 IYAWALOVNDS “on docebosondmnoDodoD sodas oonneou Gos 45 kg

PRESSURE HULL: Cylindrical shape steel with two hemispherical endcaps; |D of 1.03 m; length of 2.0 m.

BALLAST/BUOYANCY: Launched negatively buoyant, 40-kg descent weight; 20-kg ascent weight. There are twenty-one 1-kg lead weights which
may be dropped individually and 20 kg of water ballast for fine buoyancy control.

PROPULSION/CONTROL: Water jets with reversible-directional nozzles and a 2-hp electric motor which drives water through a ‘’Y”’ shaped valve
for yaw control. Jets rotate 270° in the vertical.

TRIM: Up/down bow angles of +30° can be attained by transporting 70 kg of mercury fore or aft.

POWER SOURCE: Pressure-compensated, lead-acid batteries of 125 V at 55 amp-hr.

LIFE SUPPORT: 0) is carried within the pressure hull and is automatically set and released into the hull. Cartridges containing |R8 are used to
absorb CO2.

VIEWING: Three viewports, one large and two small. Large viewport on centerline is 120-mm OD with 80° field of view. Two smaller viewports are
left and right of large port at 46°; they are 60-mm OD and allow 80° of view Atop and astern is a wide-angle viewport of i 7Aabe enabling viewing
upward in the vertical.

OPERATING/SCIENTIFIC EQUIPMENT: Gyrocompass, echo sounder (down/forward) pinger. UQC, cine cameras, radio, directional antennae.
MANIPULATORS: One hydraulically-operated arm and claw capable of two degrees of freedom.

SAFETY FEATURES: One 50-kg weight and mercury dump of 70 kg. Inflatable hatch trunk, flares, smoke signal, portable scuba for emergency
breathing.

‘SURFACE SUPPORT: SOO.

OWNER: Campagnes Oceanographique Francaises, Monaco.

BUILDER: Sud Aviation, France.

REMARKS: Inactive. Two similar vehicles. Also known as PUCE de MER or OCEAN FLEAS.

209

AFT TRIM FIBERGLASS
TANK FAIRING PRESSURE HULL

aii Case tn PROPULSION MOTOR
(STBD)

FWD TRIM

DESCENT
WEIGHT |
INVERTER

COMPRESSED
AIR TANKS JUNCTION
BOX

VIEWPORT

FAIRING
LINE

BATTERIES SAMPLE BASKET

210

SP—3000

lai length Sosons Soo ood = fs VANIER ONAMISTERS sonconnosoopnoonocuouboodGd 0.4m
BEAM: EYE EISUPPOR Ms (MAD) cmmete rate letetetteieneiaye| tate tare 144 man-hr
HEIGHT: TIONVANL THONMIEINE SoGcdonaccnccac0baspdonsan 380 amp-hr
DRAFT: . SPEEDIIKNOMS) EG RUNS Egg crperersieteteteietetsteteterer-to nee 0.5/12 hr
WEIGHT (DRY): .- WARS oooopocmouesosacecas Seb acasgo00

CRIBGE PILCHS aseoscosbaoddod0doapbodondddcK
OESSRWERS sasesqgcosdsncaccsa0ssoes 0 5.0
PAW{EO AID) amcaeholotetelietelalivest Nelle fabeicstetsiel sh-ier- tril ate t=ti-=h=he

OPERATING DEPTH:
COLLAPSE DEPTH:
LAUNCH DATE: ...

PRESSURE HULL: Spherical shape composed of two hemispheres. Sphere is of Vascojet 90 steel, 2,001-mm OD, 305 mm thick and weighs 7.35
tons.

BALLAST/BUOYANCY: Vehicle is launched negatively buoyant and descends in a helical spiral. To Obtain neutral buoyancy at operating depth a
100-kg weight is released; to ascend an 82-kg weight is released. To obtain fine buoyancy control when submerged titanium spheres (6.8 kg each) can
be employed to take on seawater for negative buoyancy; 56 weights (1.9 kg each) may be dropped individually to obtain positive buoyancy. TO
compensate for loss of positive buoyancy through hull compressibility two weights (15 kg each) may be dropped.

PROPULSION/CONTROL: Main propulsion (forward/reverse) is provided by two, port/starboard-mounted, 3-hp, 750-rpm motors driving
355-mm-diam. propellers. The reversible, 3-phase propeller motors can be independently adjusted to maneuver in any lateral direction.

TRIM: Two tanks fore and aft are used to transfer 95 kg of mercury to obtain +28° up/down bow angle.

POWER SOURCE: Pressure-compensated, Fulman-brand, type P2380, lead-acid batteries in three banks; one of 18 elements and two of 22 elements
each. The 62 elements (cells) are in series; rated at 2 V each with a total of 380 amp-hr. Variable from 130 to 117 V. Forward battery pod is
jettisonable (185 kg).

LIFE SUPPORT: 03 is carried internally and its output is manually controlled. Cabin air is forced over a cartridge of soda lime to absorb CO2. Six
cartridges are carried to absorb 1 I/min/man of CO2 for 24 hr minimum. Regnerated air is passed over a cartridge of CaCl (700 gm) to remove water
vapor and reduce humidity.

VIEWING: Two acrylic plastic ports for viewing located just below the equatorial axis and left-right of the vertical centerline forward. A smaller
camera port is located on the equatorial axis between the viewing ports. Viewports are 110-mm !|D and 100 mm thick.

OPERATING/SCIENTIFIC EQUIPMENT: UQC (8.08-kKHz), VHF transmitter, audio tape recorder, depth indicator, depth and temperature
recorder, inclinometer, gyroscope, up/down, forward echo sounder, lateral speed indicator, CTFM sonar, 27-kHz pinger, still and cine cameras.
MANIPULATORS: One with three degrees of freedom.

SAFETY FEATURES: Manually jettisonable: forward battery (185 kg); trim mercury (95 kg); and all weights described for buoyancy control (320
kg total). Emergency breathing for each Occupant through a closed circuit system (2 hr each). Inflatable conning tower for a surface egress, three
1-man life rafts, flares, smoke signal, life jackets, surface flashing light, radio signal.

SURFACE SUPPORT: SOO.

OWNER: Centre National Pour I‘Exploitation des Oceans (CNEXO), Paris.

BUILDER: Centre de |'Etudes Marine Advancees (CEMA), Marseilles, France.

REMARKS: Operating. Renamed CYANA in 1974, participated in the French-American program (FAMOUS) of exploration on the Mid-Atlantic
Ridge.

211

212

SPORTSMAN 300 & 600

600 300 600
LEINISUIEIS eoasccuscnonnodoons ceo dO O09 13 ft BATCHIDUAM EsihE Riera ctelelaltavelsisteieteren els NA NA
VANE. sooodccodoongodpoopodooodoan 7 5.5 ft LIFE SUPPORT (MAX): ......... 16 man-hr 16 man-hr
TISKCIENTS sacsdoodnonbonnadocodoseos - 5.2 ft VOU LIONS sagas cuooocag soos 4.2 kWh 4.2 kWh
DRAFT: ...... NA SPEED (KNOTS): CRUISE .......... 2/8 hr 1/10 hr
WEIGHT (DRY): 1.75 tons MAKES atepereceiencversrerere 4/3 hr 3/6 hr
OPERATINGID ERT israleletelalislelela)sterel= 300 ft 600 ft GREWSIRULOMS) ce xyarereteyeinaenelayele cue:sisteie ls crete 1 1
(SOUNDER cobococoossandoe 1,300 ft NA ORSERWERS seosooossoceqpccouc 1 1
PYNUINTSTHDYATHER no ooocconaepocoodedn 1961 1963 PANALOYOR gaoeoocnoaueUieKoonlonoT 450 Ib 700 Ib

PRESSURE HULL: Cylindrical shape of high-strength, welded and dimecoted A-36 steel 3/16 in. thick, partially reinforced with 3/g-in. double
Plate and 2-in. flat bar rings for the 300 model. The 600 model is composed of 0.5-in.-thick A-36 steel.

BALLAST/BUOYANCY: Surface buoyancy is supplied by two, side-mounted 1!/¢6-in.-thick ballast tanks. A small tank within the pressure hull
Provides small adjustment in buoyancy when submerged. A low pressure (150 psi) tank is normally used to blow main ballast, a high pressure (2,000
Psi) tank is carried in reserve,

PROPULSION/CONTROL: A 3hp electric motor (12 and 24 VDC) with two speeds forward and reverse drives a stern-mounted propeller.
Bow-mounted dive planes and a rudder provide underway attitude control.

TRIM: No systems provided.
POWER SOURCE: 300 Model: four, 175-amp-hr, 6-VDC, lead-acid batteries. 600 Model: four, 6-VDC, nickel-cadmium batteries.

LIFE SUPPORT: 0, is carried within the pressure hull in a 15-ft3-capacity tank and bled off as needed. CO, is removed by Baralyme. A snorkel
device may be used on or just below the surface. A barometer is carried to measure cabin pressure changes.

VIEWING: The conning tower has circular wrap-around windows 4 in. wide and 1 in. thick. The 600 model has an 8-in.-diam. viewport in the bow.
OPERATING/SCIENTIFIC EQUIPENT: CB radio, depth gage, compass.

MANIPULATORS: None.

SAFETY FEATURES: High pressure air for emergency ballast blow at operating depth. A 150-Ib droppable weight on the keel.

SURFACE SUPPORT: SOO.

OWNER: Several of these vehicles are reportedly built, the only ones which have been located are The Tiburon Marine Laboratory, Tiburon, Calif.
(300 Model) and the Brazosport College, Lake Jackson, Texas (600 Model).

BUILDER: American Submarine Co., Lorain, Ohio.
REMARKS: None of the models located are operating.

213

STAR I

LENGTH: HATCH DIAMETER: ee oe mie cine wien ein we een nn 19 in.
BEA Msiierererr PIERESSUBRO Rit ( MAX) oi tere ialleteletereletetelelevelellclelsleete 18 man-hr
HEIGHT: MOA POWER vcr terejetetelstetelsinic leis lefisiiel-llelals)\e (elles « 4.3 kWh
DRAFT: SPEEDI(KNOTS) CRUISES ere rcretetalalelsieislsKeltelels (aalet= 3/4/3 hr
WEIGHTA(DRW) 2) eleleielelereel=) «10 WARS Sopdiouaacdoomogs#acoosopooT 1/1 hr
OPERATING DEPTH: CREW SPITE OTS) ore cine ellene wile) mets alate tallelis)e/a\s) 0m, »\=/*1.5)*) «16186 1
COLLAPSE DEPTH: OBSERVERS ...... Detekenatetetel-Patelel-UalicKels/sfetelelelstai= te)
EAU NGHID AEs) teletet=latelalehele lela ca) =leelall=iels[ate)elinie/s)alsielale BANE OA Driteyctaterereionetkekel ticten-fel=tstet-tshelel=is¥elelelelteiens 200 Ib

PRESSURE HULL: Spherical shape 4 ft in diameter, 3/g in. thick, A 212 grade B steel. Penetrations include two viewports, hatch and two shafts
for rotating side pods,

BALLAST/BUOYANCY: Six main seawater ballast tanks of 375-Ib capacity. Ballast is blown by 144-ft3 (STP) air at 2,250 psi. Auxiliary ballast
tank inside pressure hull to obtain fine buoyancy control.

PROPULSION/CONTROL: Two side-mounted, rotatable, 0.25-hp, 24-VDC motors. Both steering and depth are controlled by rotating the motors
and differentially controlling their speed.

TRIM: None.

POWER SOURCE: Two externally-mounted, pressure-compensated, 24-VDC, 72-amp-hr, lead-acid batteries for propulsion and one 12-VDC,
72-amp-hr battery for instrumentation. Has carried experiemental fuel cell.

LIFE SUPPORT: CO, scrubber system with blower. O> is carried in an 18-ft3 (STP) bottle. Emergency system consists of a scuba regulator which
can be attached to the high pressure air supply or a scuba bottle.

VIEWING: Two 7-in.-diam, flat plate plexiglass viewports on the centerline. Axis of one looks forward and up 15° above horizontal. The other
looks down and forward 45° below the horizontal.

OPERATING/SCIENTIFIC EQUIPMENT: UOQC, directional gyro, echo sounder, depth gage, CB radio, avoidance sonar.
MANIPULATORS: None.

SAFETY FEATURES: Droppable weight of 200 Ib. External salvage and air connections. Emergency breathing off main de-ballasting air or
portable flask.

SURFACE SUPPORT: soo.

OWNER: Philadelphia Maritime Museum.

BUILDER: General Dynamics Corp., Electric Boat Div., Groton, Conn.
REMARKS: On display.

215

MAIN BALLAST TANK
MAIN PROPULSION MOTORS

VIEWING PORTS

SYNTACTIC

FOAM PRESSURE HULL

BATTERIES
HIGH PRESSURE AIR

216

STAR II

PEIN Git icercetarsieteVetatavaral-telclatebelefekelela)relivinleieieieleielwislis 17.75 ft PVATTOlr| IIVNMISINEIRNS oocenpoodopnoccocn Doo moOOO 20 in.
EAM etetesatetieherati- (ete tePateiel,=)=Ualiellelteil=['s1=/0(sie'jese,7e fe\le\'s|,»iejelie ele 5.3 ft LIFE SUPORTE IMP cooconcocoocdosdoacce 48 man-hr
IMMSKnil SsiosscsdsiooncdoccosooooosUUonoodonoS Haden WCHL IFOMERS SopocdsosudecsoutpooanadoDede 14.8 kWh
BIRIMPITS sedgcoccconooopsnc cn socoss oo penoGo Koco 4.9 ft SFASE) (SNCS? CRUISE coooconncascccuaapaas 1/10 hr
WHElCihr (DROS odooccoodesdessponsononnoodoss 5 tons MVS Scogscscodccegd0dscndGods 3/1.5 hr
CHERVATINeelPilal GodomopnocadcudoooDDde0 Gon 1,200 ft CREME IULOUS coacdoogeeconco0dpSdgaaaconUEaDDaOS 1
COMPAPSEID EPaitltaeetatlelcretaletalet-t=\eieielatalal<iafaiaiia inlets 2,400 ft OBSERMEIRS Bitte tetra tetetettala).<tefaicietetaten-pater=taiete deere 1
UNUM ers DYNES: sopdpsemocobosusssesuoosnoedooS 1966 HANILOYNDS ondosshoondobosocgngonesn65cousHooe 250 Ib

PRESSURE HULL: Spherical shape, 5-ft 1D, 5/8 in. thick, of HY-80 steel.

BALLAST/BUOYANCY: Main ballast tank of 500-Ib capacity is blown by four tanks of compressed air at 2,250 psi. Auxiliary seawater ballast tank
of 130-Ib capacity is used to obtain buoyancy adjustments when submerged. Two blocks of syntactic foam (30-pcf density) are carried fore and aft
to provide additional positive buoyancy.

PROPULSION/CONTROL: Main propulsion is provided by two propellers mounted aft on stabilizing fins and driven by a 2-hp, DC motor at 900
rpm which is reversible. Immediately behind the hatch is a vertical thruster of similar characteristics as the main propulsion units. Electrically-driven
rudder controls underway lateral maneuvering.

TRIM: No systems provided.

POWER SOURCE: Main power is derived from externally-mounted, pressure-compensated lead-acid batteries (Exide 3-FN-17) providing 180
amp-hr at 115 VDC.

LIFE SUPPORT: Gaseous O9 is carried within the hull. CO2 is removed by soda sorb.

VIEWING: Six viewports 5-in. 1D, 9-in. OD and 0.625 in. thick. A smaller viewport (2-in. 1D) is located in the hatch cover.
OPERATING/SCIENTIFIC EQUIPMENT: UQC, CB radio, still camera, TV, pinger, Magnesyn compass, altitude/depth echo sounder, depth gage.
MANIPULATORS: One.

SAFETY FEATURES: Droppable skid (300 Ib). Emergency battery pack in pressure hull. Scuba regulator in pressure hull provides emergency
breathing by drawing off the deballasting air supply. Hull can be flooded for emergency egress.

SURFACE SUPPORT: Soo.

OWNER: Electric Boat Div., General Dynamics Corp., Groton, Conn.

BUILDER: Same as above.

REMARKS: Operating. On loan to Deep Water Exploration Ltd., Honolulu, Hawaii.

217

GENERAL py
Electric Bast poss
OW itigs,

°° 8 B

VERTICAL THRUSTER

MAIN BALLAST TV CAMERA

TANK

HORIZONTAL
THRUSTER

PRESSURE HULL

FORWARD

RUDDER
ANK

AFT TRIM TANK

Wu Y
L ps
MAIN PROPULSION SN ie eee ee

IN
MOTOR HPSAIR 9° GN ee MOUNTING
PLATE

BATTERIES VIEWING PORTS

MANIPULATOR
218

STAR III

LENGTH: 2.20 cect cent treet eee were recs sces 24.5 ft FASC ERD VA METI Fils epatatar ete) eteelelletelelelis/aie/elelnvele\sisinvnl's 20 in.
BEAM i) circ ce inte cree nis wiv e eleim't ie wie wins oles oles 0 ie sia 6.75 ft EVEEISUPPO Riles (MAD) cieetajatereisteleleletel«fel=telletaleiel= 120 man-hr
FENG is) sree cree wie ein wie w vie = om =n alaiaic esis 00s vie e\aje 8 ft MOMMA POWERics ficveteletatat=aicielsfelsleie\elelel=(elelein)einiels/= 30 kWh
DIVNA cooo nou VOODOO Ob OOo eo COU OLOID OOO 0 UG 6.5 ft SPEED) (KNOTS): CRUISE cone ee cence <== 1/12 hr
WENGR (DERRGE ocoohdooposu0dupoupUoDDOODdGS 10.5 tons MAX ore cfe elm) eleheleiefeieie)e»is\eje/s/se 0/0 4/1.5 hr
OPERATING DEPTH: . 2... cence ncn ncccscnscces 2,000 ft CREW IRE OMS reparepetet rhe! fate iatetalelnlelelelel/alsole\\e) =e) =|e)=\sl= ial 1
COLELEARSE DEPTH (ic svete nie © ee elereinie. wie isie sin 6 imines 4,000 ft OESIAMERS soveteccondccusocbascosboesscod 1
EAUNCHIDAME: cece cman ween sc ceiewins 1966 BPANIE OAD iiaretonenetatien ater state totaietclel(eled=iioil=|iainielayeialierai=felt= 1,000 Ib

PRESSURE HULL: Spherical shape, 5.5-ft 1D, 0.5 in. thick and made of HY-100 steel.

BALLAST/BUOYANCY: NA.

PROPULSION/CONTROL: Main propulsion is provided by a stern-mounted, reversible, 7.5-hp propeller. One vertical and one horizontal thruster,
each powered by a 2-hp motor, assist in maneuvering. An electrically-actuated rudder assists in underway maneuvering.

TRIM: Bow angles of +30° can be obtained by transferring mercury between fore and aft tanks.

POWER SOURCE: Sixty, external, pressure-compensated, lead-acid battery cells provide 29 kWh of 120-VDC power at a 10-hr discharge rate. This
can be converted to 115 VAC, 60 Hz.

LIFE SUPPORT: A pressure regulator automatically bleeds O2 from a 72-ft3-capacity tank into the hull. CO2 is removed by soda sorb. A reserve
QO tank is carried that is manually operated as desired. Monitors for O02, CO and cabin pressure. Emergency breathing is from two scuba regulator
drawing off the high pressure air supply.

VIEWING: There are five viewports, each is 2 in. thick with a 5-in. 1D and a 9-in. OD. Three of the ports look forward and are depressed 33° fror
the horizontal. One of these is on the vertical centerline. The remaining two viewports are raised approximately 10° above the horizontal and aré
located 90° to the right and left of the centerline. Each viewport has a field of view of 69° in water.

OPERATING/SCIENTIFIC EQUIPMENT: UOC, CB radio, pinger, Magnesyn compass, altitude/depth echo sounder, depth gage, two TV cameras
still camera.

MANIPULATORS: One with six degrees of freedom.

SAFETY FEATURES: Lead weight (250 Ib) drops automatically if high pressure air supply drops below 185 psi above ambient seawater pressure
Manipulator jettisonable. Hull can be flooded for emergency egress.

SURFACE SUPPORT: soo.

OWNER: Scripps Institute of Oceanography, La Jolla, Calif.

BUILDER: Electric Boat Div., General Dynamics Corp,, Groton, Conn.

REMARKS: Not operating.

219

nites ase RIES

220

SUBMANAUT

LENGTH: HATCHIDIAMEMER: 6 oc cnc cise wie noe mee eieicie isis 16.5 in.
BEAM: MITES SUIARORIT (MVC OE So doa cooconne omood ooo 24 man-hr
HEIGHT: MOAT POWER Gi terenatetetenstst-leletsi=telal etulateleilele silaleleia) «ii 3.5 kWh
DRAFT: SHEED (KNORR ORMUNISE csucoshooncaucuuondade 1.1/4 hr
WEIGHT (DRY): MVS Goggao ans cooOMOOd ouGn JONG 1.6/2 hr
OPERATING DEPTH: .........-. 22 eee eee ee eee 200 ft CREE (PULOHIS: sandcusccmogdcondbomodnoend 60 gU ob O60 o 1
(COJEPY NAS VelFiinlG “Adia ao omc eo. coro Dood oroo-o 2,000 ft ORSSRWERS sooasoocoucasncndnsonoenooauTes 1
BAUWNGHIDAMIES foci cece ctetetspe sie = winieins le ie eee 1963 PYWHLOYNS) Saunidnno doco Odo,cuOtD Uap ooo 2o.O-omne 1,200 Ib

PRESSURE HULL: Elliptically-shaped pressure hull, with a major axis of 96 in. and a minor axis of 42 in. It is constructed of 128 rings of
0.75-in-thick plywood bonded together. The radial thickness of the rings is 4 in. and the assembled hull is covered with 0.75-in.-thick glass reinforced
plastic giving a total hull thickness of 4.75 in. The hatch is of steel with a flat gasket seal.

BALLAST/BUOYANCY: A water ballast tank located within the pressure hull provides +110-Ib buoyancy and may be manually pumped or blown
with air. External ballast tanks are presently under construction.

PROPULSION/CONTROL: Forward and reverse thrust is provided by a 1.5-hp, 1,800-rpm, 24-VDC motor mounted on centerline aft. Two !/3-hp,
800-rpm motors are mounted on the main motor casing, one vertically and one horizontally to provide vertical and horizontal! thrust.
Pneumatically-actuated diving planes and rudder are also mounted aft for altitude control while underway.

TRIM: No static trim or list control is provided. Underway trim is controlled by the diving planes and vertical thruster.
POWER SOURCE: Four 6-V, 120-amp-hr, lead-acid batteries connected in series and one 12-V battery are carried inside the pressure hull.

LIFE SUPPORT: ©» resupply is accomplished manually from a 60-SCF O 2 tank and CO 2 is scrubbed using a blower to recirculate cabin air. A
desiccant is used to reduce humidity.

VIEWING: A single 4in.-thick plexiglass viewport with an OD of 24 in. is located at the bow. Because of the method of mounting, a viewing angle
of 170° is obtained when in the water. The ID of the window is 12 in.

OPERATING/SCIENTIFIC EQUIPMENT: UQC, speed/distance indicator, water temperature sensor, depth gage, pinger.
MANIPULATORS: None.

SAFETY FEATURES: 300 Ib of lead in segments formed to the hull are held in place with a steel band around the hull forward of the conning
tower. The band can be released hydraulically from inside the pressure hull to jettison the weights.

SURFACE SUPPORT: SUBMANAUT is transported on a modified auto trailer and launched by moving the trailer down any available boat
launching ramp. No support ship has been used for transport.

OWNER: Helle Engineering, Inc., San Diego, Calif.
BUILDER: Same as above.
REMARKS: Not operating.

221

222

SUBMANAUT

TREN Gili epetetatateustemeteteret=fetelelelalelelelel=sel=tsli»ieie)s 1s] elie) sls =a 43 ft HAMCHIDUAM EME Reeser ete lefet=) ele) -e tie) »fellelleleicll*l ele) =l=/ 34 in.
BEAM aie repe tela oelelaretonat-t-tetiat=lacelsitets]-'elloli=l=injelatelelenefels 10.75 ft EVERESSUPPO Rite (MAX) ai eleleletele lle tetelletelelel=!alel=0=1= 300 man-hr
infaNelnhre SuonocossoococposecUooodDCodUdoomMoDdooD 16 ft TOMAEIP OWE RS (tens ote reletene leer elsifolieelerer= ie) ==\t~ isi t= ei 91 kWh
DEA Fel priceeteeerererelnyereelotciel okaved=ler=l-1-laleite! sites) aifsi's{isi= Wels fern faze 9 ft SPEED) (IKNOMS)SICRUISES eiretereieretole tele relel elereiel=liel=!« 3/20 hr
WEIGHT (DRY) © occ nc i nie ns ew emcee eine 50.5 tons MWS oooocopceosgoeeHeosoSGcs 4.5/10 hr
OPERATING DEPTH: ..........220ese eres eene 600 ft GCREWABP IE OMS iepedayater siatatol eletstelsteleletinsele|ie=leit=t ei =imt.=\-it=ilelt= fa) i= 2
COPPAPRSEI DERI i eyerarcteretalekelolleiel=et=le! =e" = ssi) eie ls) «= NA OERSRWSIE sossssoo0ssognadguncoccundoD0KGd 4
PAUNGCHIDAT Es oie eee cietetete oe nle iets leis) ojeiel tn] s/s) sin e)e) > 1956 PAV EOAD 3 (oie onc <fere tee cre ere a © nies seine sicieisise ei 4,500 Ib

PRESSURE HULL: Cylindrical shape, constructed of an inner and outer hull 9/16 in. thick, 10/30 carbon steel, welded, air-peened and stress
relieved. Honeycomb reinforcement between hulls. Conning tower is 1.0-in.-thick rolled steel.

BALLAST/BUOYANCY: To obtain + buoyancy there are four hull tanks (346 gal ea.) and two keel tanks (140 gal ea.). Tanks may be emptied by
Pumps (high & low pressure systems) or compressed air. Fine buoyancy control is obtained by adding or subtracting water from smaller tanks, 945
gal are required to submerge leaving 5-35 gal to obtain negative buoyancy. Ballast pumps are: a 10-hp, 80-gpm at 300 psi (high pressure) and a 5-hp,
400-gpm at 25 psi (low pressure).

PROPULSION/CONTROL: Main propulsion is provided by a stern-mounted, 38 in. x 34 in. propeller. Underway maneuvering is obtained through a
rudder and dive planes.

TRIM: No systems provided.

POWER SOURCE: Surface. General Motors, 6-cylinder diesel engine developing 235 hp. Submerged: lead-acid batteries in each ‘‘leg’’ are in
Pressure- resistant cases. There is a 115-V bank in each leg with a total of nineteen 12-V units of 400-amp-hr capacity. Batteries are recharged on the
surface by the diesel engine.

LIFE SUPPORT: Two tanks containing 200 ft? of OQ are carried within the pressure hull. Three circulating blowers with attached soda lime
cannisters are used to remove CO2. Two bunks are available.

VIEWING: Three, 2.5-in.-thick, Plex R (Rohm & Haas) wrap-around windows are on the forward hemihead; they are two 17 in. x 48 in. and one 17
in. x 16 in. all on a 51-in. radius in the same horizontal plane. Conning tower has one window 20 in. x 14 in., 3 in. thick, on a 20-in. radius. Six
additional glass (crown optical) viewports, 6 in. thick, 7-in. OD and 5.75-in. 1D, are located throughout the vehicle.

OPERATING/SCIENTIFIC EQUIPMENT: Gyrocompass with three repeaters, depth sounder, radio telephone.

MANIPULATORS: None.

SAFETY FEATURES: The entire keel (‘legs’) section is manually releasable and totals 3,240 Ib. Dry chemical fire extinguisher, life vests.
SURFACE SUPPORT: Independent operation.

OWNER: Uncertain, as of August 1968 vehicle was owned by Submarine Services Inc., Coral Gables, Fla.

BUILDER: Martine’s Diving Bells Inc., San Diego, Calif.

REMARKS: Not operating.

223

ct] ) BALLAST TANK
[eS

CENTER VIEW PORT
FIXED LEAD BALLAST
MANIPULATOR

BATTERY BOX
LIFE SUPPORT
COMMUN. UNIT
GYRO POWER SUPPLY

EAD BALLAST
VARIABLE BALLAST TANK PORTABLE L
HIGH PRESSURE AIR SUPPLY

224

SUBMARAY

EIST Ine ooocondGsnoconnocdosonooooonoonMoDOnS 14 ft HAT CaS AME IER cmuecteloleretciaietelererstaricicietercieisih cietcre 18 in.
HENNE coogcobaooboonppooonecoGonaouaodaoogDO a 3 ft (LIFES SURRORTUIMAV GS conoboos coo ooonondonS 32 man-hr
AISUCRAIS soeodoopsotoepbersccc eases soesaonoDer 5 ft HOMALIPOWE Riciaevctetetetottslercyolioucicisacrsusuace ere aveneusys ss 4.5 kWh
DIRVANFIT coooooosodonMoomoabooedocdoogen pag nOee 2.1 ft SREEDKCKNOmS) CRUISE ence cite iicisisieisere aia \ere) 2/6 hr
WMeltenlir (DENG codonnopnocuooonoDadocod oOOS 1.45 tons MEAS ano docooDoounsaoesombae saa NA
O)FSIRVATMINKSHIDISIPITRIS soopcocosnaotoonbognsccdscncd 300 ft CREWEFUIGSREY sodden sun condos oper pound oon one 1
LAQWUANASIE IDE FMR oooocosnhoooon DOU DO DDODOOD 1,100 ft GESTSRWERS ascasosparcasnoocncospooonuDES 1
LAUNCH VNUISS sococetoogobous cou eSDoOnuaKOIOOn 1962 LYN ALIOV ND) Ri oaio eno00 o'd-0-0°0-0 hO.0 COD ROO CeO Oa Oe 450 Ib

PRESSURE HULL: Cylindrical shape composed of mild steel (boiler plate) 36-in. 1D; 88 in. long and 3/8 in. thick.

BALLAST/BUOYANCY: Main ballast is provided through 900-Ib-capacity tanks blown with high pressure air. An 8.5-gal-capacity tank serves as a
variable buoyancy tank.

PROPULSION/CONTROL: A stern-mounted propeller provides forward and reverse maneuverability and is powered by a 24-VDC, 2-hp,
1,800-rpm, 1-speed, forward/reverse motor. A rudder aft of the propeller and dive planes on the bow provide lateral and vertical maneuvering,
respectively.

TRIM: No systems provided.

POWER SOURCE: Four, 6-V, 190-amp-hr, lead-acid batteries supply main power. Dry cell batteries power CB radio and UQC.

LIFE SUPPORT: 09 is carried within the pressure hull in a 50-ft3 tank. CO, is removed by blowing cabin air through Baralyme. A barometer
monitors cabin pressure and a hydrometer monitors humidity.

VIEWING: Four viewports, 7-in. diam. in lower hull. Eight, 6-in.-diam. ports in conning tower.

OPERATING/SCIENTIFIC EQUIPMENT: UQC, depth gage, forward-scanning and downward-looking recording echo sounders. CB radio,
gyrocompass.

MANIPULATORS: None.

SAFETY FEATURES: Manually droppable 40-lb weights, main ballast blows at maximum operating depth, pressure hull may be flooded to allow
escape, marker buoy can be released from within vehicle.

SURFACE SUPPORT: Soo.

OWNER: Kinautics Inc., Winchester, Mass.
BUILDER: C & D Tools, Calif.
REMARKS: Not operating.

225

METAL
FAIRING

BATTERY
PODS (5)

MAIN BALLAST
TANKS (WITHIN AND
INTEGRAL TO FAIRING)

FIBERGLASS
FAIRING

HYDRAULIC
MOTOR
CONTROLLER

PRESSURE HULL

SEACOCK

STARBOARD

THRUSTER COMPRESSED
AIR

JETTISONABLE
BALLAST

VARIABLE
BALLAST
TANK

226

SURV

Ya Kenn GaoscncuopaoDoU oO bo E OOOOH ODO COC mGCI cc 10.9 ft LVL NI SUlslals 5° 6.04 6006 6.0.6 OnW Otome ond NA
BEAM: LURS SU AROGIE WAR SIS cooodsencop00d0000U0 100 man-hr
FAEG EA Ticetteyeaketattatalaletonal=(n'aleiwleval'sieye wisie|si=injaiuioleeiojateiain 9.5 ft VON LIHOWUEES acoso nouendocdooumcHoonnoaose 12 kWh
DIAVNFUE ope sac coos odes dsonbonsochoodocuoeoosoD NA GrEED) UOUENE CRISS soscscsodecnsouaneuce 0.5/9 hr
WUsiGiehy UBIENNS soca aceececneeccocsouuend05cs 6.1 tons INVARS goceodesnoncoecgococuseoonds 2.5
OPASRVATING (SAB soosoosusassoncoscosnoouss 600 ft (ARIS PUIL(ORIES sosacseteouposecoonboosnosgSooogood 1
SOUNDS lau ss5c4asoeeossegsoneocsotes 4,800 ft QESERWEERS sonsosscaneoadetsauansonscos00 1
LY NUINCMEYMIHER os coo dgagoesb6ad soo SoommEOCooOSon 1967 PNAMOYNER. sacococcd scone basso oogNbONdDODDGoOGD 250 Ib

PRESSURE HULL: Cylindrical shape with “‘dish’’ endcaps composed of mild steel plate to BS 1501/1518. Cylinder is 1-!/8 in. thick; upper endcap
is 1.5 in. thick; lower endcap is 1-5/g in. thick. Total length 6.5 ft, 1D of 5 ft.

BALLAST/BUOYANCY: Three free-flooding tanks within fiberglass fairing around pressure hull provide surface buoyancy of 850 Ib. They are
blown by a 275-ft3-capacity, 2,500-psi air tank. Tanks may be blown at 600-ft depth. Two trim tanks of +40-Ib capacity located aft of the pressure
hull provide submerged buoyancy control. An identical backup blowing system is carried.

PROPULSION/CONTROL: Lateral propulsion is provided by two (port/starboard), variable-speed, 2.5-hp each motors. The motors are rotatable to
Provide any angle beyond 5° in the vertical.

TRIM: No systems.

POWER SOURCE: Lead-acid batteries (146-V) carried in five pressure-resistant cases.

LIFE SUPPORT: 03 is supplied by two, 40-ft3, 1,850-psi tanks within the pressure hull and is manually controlled. CO is absorbed in four soda
lime cannisters of 3.5-lb capacity each. O7 and CO> partial pressures are constantly displayed. An alarm system is automatically activated if CO7
exceeds 1% or O2 departs from 20% to 24%.

VIEWING: Ten plastic viewports in pressure hull are 2.25 in. thick; 7-in. OD and 4-in. 1D. Three smaller viewports are located around the conning
tower.

OPERATING/SCIENTIFIC EQUIPMENT: UQC, hard-line telephone (shallow depth), gyrocompass, rate-of-turn indicator, pressure depth gage,
up/down echo sounder, speedometers, temperature gage.

MANIPULATORS: None.

SAFETY FEATURES: Portable emergency breathing sets (40 ft? of air ea.) are provided. Jettisonable weights (850 Ib). Main ballast tanks can be
blown at operating depth. Pressure hull can be flooded for personnel egress.

SURFACE SUPPORT: soo.

OWNER: Lintott Engineering Ltd., Horsham, England.

BUILDER: Same.

REMARKS: Retired 1969.

227

228

SURVEY SUB 1

PEIN Gili tay roraretetca(ennieienetsaetetter totiais)aleliajiarisnaife fens taliels i =fals/s)i=ia\'= 26 ft VMS IVNNIEIASIRS sosocanctoooosdousodsgoc0er 24 in.
[FIS/AME Socoaneodeo co ado cb moc 0.0 Clon G common ocd 7.1 ft EI RESUPRPOR Ta (MAD) ci erect ney-iarciate r= ier -...+ 216 man-hr
InNEIKOVRIIIS aibusenie i Giold 0 Ors angio Oo Ser DeCR Se Che ee Coo enL is 8 ft TOAVANE IROWMETIE SongocHondodgo0b sco Gos poo Gon 49.9 kWh
[RV NAIIS: Geto pod td Gd oiOW oe cOS SUICOnmIo gd OO CIO O Olona 5.3 ft SHEED MINOW) CRIBS soosa0sc0d0aK05000005 1.5/10 hr
WHENGi ARON O)R” as clea 0 ces comic oo cromeicso-cBeacececan 11.25 tons WWE nooo asodeonopnb6ooeo ado o0s 4.5 hr
OPERATING DEPTH: 2. cc. ee cc ee we ee ee 1,350 ft CRIEWEH IPULOTS achacichoocasescdochooucbopegopsooe 1
GCOEEAPSEIDEPRTES (ijcterate state sie) eee sein = eee wie ens m 2,500 ft ORASRWERS ageoscesendcnseos555agassaoes 5 2
IPAUUINGHIDAMIEIS eieccccisrete on wie cee oes ae ies wins wee 1970 BA WIE OUAID re Sine retere stab eteten ates el sifercelal'e te ywitn ee s\cs\/e"el's)/s'sie tetas 500 Ib

PRESSURE HULL: Cylindrical shape of SA-537 grade A normalized steel 9/16 in. thick, 54-in. 1D, 218-in. length.

BALLAST/BUOYANCY: Main buoyancy (1,100 Ib) is from a soft reservoir tank connected to a smaller hard tank; both are blown by compressed
air. Two internal, fore/aft tanks control fine buoyancy or trim (+400 Ib).

PROPULSION/CONTROL: Main propulsion is through a variable-speed reversible 10-hp, DC electric motor mounted in a water-tight container in
the stern which drives a stern propeller. One single-speed reversible bow thruster (0.75-hp) and two O.5-hp vertical thrusters provide low speed
maneuvering. Hydraulically activated bow planes and rudder control attitude underway. An automatic pilot controls rudder angle.

TRIM: Two, internally-mounted, fore and aft tanks can be differentially filled with seawater to attain up/down angles on the bow.

POWER SOURCE: Twin battery pods, 18-in. diam. of SA53 grade B steel, contain 6-V, lead-acid heavy duty batteries providing 120 VDC main
power (41.6 kWh at 20 hr) and 24-VDC auxiliary power (8.3 kWh at 20 hr).

LIFE SUPPORT: Gaseous O> (four tanks) is carried external to the pressure hull. 240-ft3 total capacity. CO is removed by LiOH (6.4 Ib).
VIEWING: Twenty-one viewports; nine in the forward pressure hull, nine in the conning tower and three aft. All are 6.25-in. ID, 1.5 in. thick, 8-in.
OD.

OPERATING/SCIENTIFIC EQUIPMENT: UQC, CB radio, Magnesyn compass, Doppler navigation sonar, scanning sonar, up/down recording echo
sounder, Transponder and pinger, three TV's with three video recorders and five monitors.

MANIPULATORS: None.

SAFETY FEATURES: Ballast (1,150 Ib) can be blown at maximum operating depth. Mechanically droppable 840-Ib weight. Emergency breathing
devices for each passenger. Flashing light.

SURFACE SUPPORT: Presently supported by the M/V WILLIAM DAMPIER, an off-shore oil supply boat 170 ft long, 39-ft beam, 9-ft draft which
cruises at 12 knots and has a range of 6,500 n.m. A constant-tension, 50,000-Ib-capability, stern A-Frame handling system is used for
launch/retrieval. The support ship can berth 22 people, 2 of these accommodations are for customer personnel.

OWNER: Taylor Diving Services, Belle Chasse, La.

BUILDER: Perry Submarine Builders, Riviera Beach, Fla.

REMARKS: Operating. Originally designated PC-9 by Perry, recently redesignated TS-1 by present owner. Original owner, Brown and Root, gave it
its SURVEY SUB 1 designation.

229

CONNING TOWER

BALLAST TANKS
(WITH 5 PLEXIGLASS PORTHOLES)

ENGINE AIR TANKS

LIGHT

PILOT SEAT

OBSERVER SEAT

ALS ye

ASTI AN
Oe eect

CS
AIR COMPRESSOR [EEN

/ N
SIDE PORTHOLES OBSERVER SEATS

BATTERY COMPARTMENT

230

TOURS 64 AND 66

BEN Gib haarercrcnsreyatersietaberetelinicetolntetteleeleln leiveuevelcin la elinisia 7.28m InVtela) OVATE Goosen dccansonocosn0bedoSeuoode 0.7m
BENGE oocomos po ohocosdE00 65 CU OUU RODD conc 3.80 m PIEESSUEPO RTM ASG) = mrstelatatsielslarvetelsiatetsiei-iessier 96 man-hr
ISI asoondocubochoooubodbo COs UOOUgdaUIOD 3.20 m MOmAL OWE Ri ctaretetnitetetstatelatoielsiareletoyeiere =i iater i 330 amp-hr
IDIRVNFTS ocoocpoon ogoo dota commotbucoccue todca0 2.0m SHAS USNOUSE CHWISE ssocnooncsbesacosoasce 3/7 hr
WHEUGRAr (DENME sauéntabcd dcocncosdsuuaeDOooUo 10 tons MASS cen bo co0docdqboenasSas 5.5/3.5 hr
GIHSRVATUNS (SPE ssoncccococnsooocooDdcages 300 m CO HEWAIMLOMES scnosgocdobanonoodes cooudnneodcenteeE 1
(HOWL LON SS IDIEP Tas sstesoecsconseggoans6sscsos 600 m OPSISRMEERES ccoaéoscanoustccs0nescaso0s eos 1
L/NUINTCIRIIVATIMES conoscocdsnosscengescgs 1971 (Tours 64) PAA LOVNDS pooaacsddoconscoadocseaganooaeeacs 400 kg

1972 (Tours 66)

PRESSURE HULL: Cylindrical shape, composed of a steel cylinder and hemispherical endcaps. Hull diameter is 1.90 m and length is 4.84 m. A
cylindrical conning tower, called a trunk, is welded to the cylinder. Two hoisting eyes and two keel skates are also welded to the hull.
BALLAST/BUOYANCY: Two main ballast tanks (38.4-ft3 capacity), welded to the sides of the pressure hull, are flooded to descend to a decks
awash depth, water is then admitted into a compensating tank until the conning tower is almost submerged, at this point the vehicle is trimmed to a
down angle and the vehicle is powered to depth. Ascent is effected by powering to the surface where the main tanks are blown.
PROPULSION/CONTROL: Two side mounted propellers each driven by a 6-hp motor provide propulsion in the lateral and vertical. The motors are
reversible, two speed and 360° rotatable.

TRIM: A weight (150 kg) may be hydraulically shifted along a horizontal rail to obtain a trim angle of +20°.

POWER SOURCE: Two lead-acid battery packages of 48 cells each within the pressure hull, supply power at 165 amp-hr (5-hr discharge). A
diesel-electric motor is used for surface power to charge batteries and drive a compressor to fill air tanks.

LIFE SUPPORT: Three O, flasks (5 | each) are carried within the hull. CO2 scrubbers (soda lime) are also carried. On the surface it is possible to
draw fresh air into the hull with a snorkel device and thereby avoid opening the hatch.

VIEWING: Four viewports in the forward hemisphere 283-mm OD; 155-mm ID and 65 mm thick. Five viewports in conning tower 203-mm ID;
105-mm OD and 50 mm thick.

OPERATING/SCIENTIFIC EQUIPMENT: UQC, echo sounder, depth gage, gyrocompass, forward-scanning sonar, radio, radar reflector, surface
lights.

MANIPULATORS: One mechanical arm which may be used to 200-ft depth.

SAFETY FEATURES: Main ballast tanks may be blown at any depth. Droppable lead weight between skegs (100 kg). If the vehicle descends below
its Operating depth main ballast tanks are automatically blown. This system will activate automatically unless stopped once every 15 minutes.
Pressure hull may be flooded for emergency escape using a closed circuit breathing system. Marker buoy and snorkel.

SURFACE SUPPORT: soo.

OWNER: TOURS 64: Kuofeng Ocean Development Corp., Taipei, Taiwan.
TOURS 66: Sarda Estracione Lavorazione, Cagliari, Sardinia.

BUILDER: Maschinenbau Gabler GmbH, Federal Republic of Germany.
REMARKS: Operating, harvesting red and pink deep-sea coral.

231

WATER
BALLAST
TANK

Ar

PROPELLER

IN MANIFOLD

FUELING

WIRE

PRESSURE
SPHERE

Se ears
oe

PROPELLERS
RELEASE

=< MECHANICAL ARM

VIEW PORT

TRIESTE |

16.9-in. 1D; 22.5-in. OD

LENGTH: HATCH DIAMETER:

BIEZN) Sococono otcioo oc Sia aie Sac Cio ara a LIFE SUPPORT (MAX): SSO 0 O00 6 5.0 CH OeS ene soe INVA
HEIGHT: TOUWAL IROMMEIRNS socomeoccooeopoc0 cp oodbouNmOSGDE NA
DRAFT: SPEED (KNOTS CRUISES soasococctangmoso0dc0G -. 0.5
WEIGHT (DRY): VS boo COD OO 0.0 CODED ROOD On ae T 0.5
OPERATING DEPT S%9 ee . No known ocean limit (CIES PUILOUS psacososnbcsocopsot copoorooueo atone 1
COIEARS ED ERIS eter cis releks inten ltatntiatinlianel«iinite (exesle iam 60,000 ft ORS AWENS ssesceodoctoocesegcopsececs Go 2
[LYNUIN CE RISYMIED Goinooooncap es Gor boob oc oeopooGeec 1953 PEW ILHOVNDR Scpbnndooonpdkoros bone Gopene oon Sart. NA

PRESSURE HULL: Spherical shape of three, Ni-Cr-Mo steel forgings 6.25-in. 1D and 5 to 7 in. thick.

BALLAST/BUOYANCY: Buoyancy provided by 29,000 gal of aviation gasoline. Eleven tons of steel shot ballast carried in two hoppers is released
to offset compression of gasoline as vehicle goes deeper. Release controlled through an electromagnet valve. Additional shot release Over amount
required to offset gasoline compression initiates ascent. A small fixed percentage of gasoline may be released to offset Over release of shot if
necessary.

PROPULSION/CONTROL: Two, 2-hp motors used for propulsion and steering. Motors in light casings filled with Trichlorethelene and
pressure-compensated.

TRIM: Some bow angles obtainable by dropping shot only from one hopper.

POWER SOURCE: Initially lead-acid batteries in the sphere, these were replaced by silver-zinc batteries.

LIFE SUPPORT: Compressed, gaseous O3 at constant flow rate equivalent to usage Of two men, passed through an eductor, draws cabin air through
three Drager (LiOH) cannisters to remove CO).

VIEWING: Two plastic conical viewports 2-in. 1D, 16-in. OD and 7 in. thick.

OPERATING/SCIENTIFIC EQUIPMENT: UQC, echo sounder, depth gage.

MANIPULATORS: None.

SAFETY FEATURES: Electromagnetic shot valves fall open upon loss of power. Each of the two hoppers held in place electromagnetically may be
jettisoned if valves fail and will release automatically in event of power loss. Gasoline compartments sized such that loss of all gasoline in one
compartment will not reduce buoyancy below ability of reserve shot to compensate.

SURFACE/SHORE SUPPORT: Sea-going tug for tow to and from dive site.

OWNER: U.S. Navy.

BUILDER: Auguste and Jacques Piccard.

REMARKS: The above description is from the 1953-1959 period. TRIESTE | established and still holds the world’s deepest dive record: 35,800 ft
in the Challenger Deep (200 miles southwest of Guam) on 23 Jan. 1960. Aboard during this dive was Jacques Piccard and LT Don Walsh, USN. The
float is now on display in the Navy Yard, Wash., D.C.

233

AFT BALLAST TUB
GUIDE ROPE
RELEASE MAGNET RELEASE MAGNET

geet eure WIREWAY PIPE
ee ANEUVERING GASOLINE VALVE eee SHOT TUB CHAIN PIPE
BATTERY COMPENSATION VALVE \UQC | | ACCESS TUBE SCIENTIFIC WELL

SONAR
HOUSING
DOOR
LIGHT (8)
"FE MANEUVERING ™ <<
GASOLINE f /fargg—SviEweoRT | / MELE RRORNP
\ UQCc TANK H CAMERAS WINDOW
\ ANTECHAMBER
\ UNDERWATER
CORROSION \ TELEPHONE ANTI-CORROSION ANODES
eee \ \ TELEVISION CAMERA PRESSURE
GUIDE ROPE PELLET \ SPHERE
| BALLAST \ FATHOMETER (12KC)
AFT WATER MAGENT AFT SHOT TUB
—< BALLAST GASOLINE BALLAST TANKS <
TANK FWD WATER
BALLAST
TANK

234

TRIESTE I

LEE NGTUEIS oreo rreite rate! sic) e!s'inymimi mint e]=fe)himiivi=\~ ilu w/e) +0) 0) vise 78.6 ft PATCHIDVUAMEME Ritaicrrer-feleinieketoiexclsieiclelelelleteven=te 19.8-in. ID
[IS/NUB MS accnoapclonoon wou ooUr NOOO OOO Romolo 15.25 ft LUE SUTRAS Scoonosnoogscoopnodds 72 man-hr
PISCinA SoconondupmooOndog SoU don eo BOOT O Uimou 26.9 ft MORALE OW ER irerevatetoyaqeted=tetatenaletayalodaValis|in/ejelals/ levee lslrels NA
DIV NHe shomcoomonoobiDo COD DOO OOD ODO OOD GOGmOODC 21 ft SREEDIIKNOTS)GR US eaeroieietetelletstefeletote lolol ele)el ee 2/12 hr
WENGE (OEY) Foie oie iole te toleletaietelieletalas etn '=!'e/s\i=le\=ieacfa 87.5 tons WARS posancecaopoopoocnouonponooG NA
OPERATING) D ERE eats tetetetetetetatotelatarelleleKel=ieleel= 20,000 tons GANS ILGUS socpsssnesesosocamonpntoonpOoGDDONES 2
COLLAPSE DEPTH: . 2.2.2.0. ee ee eee we wee > 40,000 ft @ESSTMERS concoersoocc ounsopoccwgcapaooS 1
EAU NGCHID AMIE Fie roreic cle rerelerefeiein)ate) «mie nin letataiin l= taal <tmi=t = 1964 PAVE OAD saiaraiatetatatatetlatetedstehaea tote te fel sat viata vets7s\oia\iey offers 5 tons

PRESSURE HULL: Spherical shape composed of two hemispheres of HY-120 steel clamped together on an equatorial flange. |D of 84 in., 3.9 in.
thick to 6 in. at viewports and penetrations.

BALLAST/BUOYANCY: Aviation gasoline (65,830 gal) is carried in a thin-walled float to provide positive buoyancy. Electromagnetically held iron
shot (22 tons) provides negative buoyancy and is incrementally released to ascend or decrease the vehicle’s buoyancy. Trailing ball (250 & 750 |b) on
150-ft cable.

PROPULSION/CONTROL: Three, stern-mounted, 1,750-rpm, 120-VDC, 6.5-hp (each) motors provide main propulsion. A horizontal thruster is
mounted on the bow.

TRIM: Shot hoppers mounted port/starboard amidships and one aft may be differentially filled to obtain 412° list, and +33° to —27° down bow
angles at 20,000 ft.

POWER SOURCE: Externally-mounted, pressure-compensated silver-zinc batteries. Sixteen cells provide 5,000 amp-hr apiece at 24 V and 80 cells
Provide 952 amp-hr apiece at 120 V.

LIFE SUPPORT: Gaseous O03, three bottles, each 72 ft? at 2,250 psi (two normal, one emergency). CO removed by LiOH. Monitors for 07, CO,
cabin pressure, temperature and humidity. Air conditioning system, Hull heat exchange system. Emergency breathing off O> bottle.

VIEWING: Four plastic viewports. One is 16-in. OD, the remaining three are 3-in. OD.

OPERATING/SCIENTIFIC EQUIPMENT: UQC, CTFM sonar, Doppler navigator, X-Y plotter, gyrocompass, altitude/depth sonar, echo sounder,
transponder interrogator system, sound velocimeter, three still cameras, One cine camera, three TV's.

MANIPULATORS: One with six degrees of freedom.

SAFETY FEATURES: Shot and several outboard equipments jettisonable. Emergency breathing of 36 man-hr. Fail-safe shot jettison. Fire
extinguisher. Distress rockets. Surface lights.

SURFACE SUPPORT: Transported by floating Dry Dock towed by an ocean-going tugboat

OWNER: U.S. Navy, Submarine Development Group One, San Francisco, Calif.

BUILDER: U.S. Navy, Mare Island Shipyard, San Francisco, Calif.

REMARKS: Operational. Studies underway to substitute aviation gasoline with lsopar F., a lower flash-point fluid. Since its first major
modification in 1964, TRIESTE 1! has undergone numerous, significant design and Operational changes. The above description is how it now (Aug.
1974) stands.

MOTOR
COMPARTMENT STERN VERTICAL
STERN HORIZONTAL THRUSTER DEPTH GAUGE
THRUSTER BATTERY POD
RELEASE LEVERS

CO, SCRUBBER

DIVERS COMPARTMENT
PRESSURE GAUGE

CONNING TOWER

PILOTS CONTROL
CONSOLETTE

TRIM SYSTEM
CONTROL VALVES

STABILISING
PLANE
(FIXED)

MIXED GAS

SPHERE SONAR DISPLAY

& CONTROL

DIVER LOCKOUT
COMPARTMENT, BOW HORIZONTAL
INNER LOCKOUT THRUSTER
HATCH

OUTER LOCKOUT
HATCH

PRESSURE TIGHT
HATCH
PRIMARY POWER
DISTRIBUTION PANEL

BATTERY POD RELEASE
HAND PUMP
BATTERY POD
HYDROPLANE

UNDERWATER
COMMUNICATIONS SET

DRY CELL
WATER ALARM

PILOTS CONTROL
STATION

HYDRAULIC LEG

236

VOL-L1

LENSE aados cass od oacdoudnonoooHodoOgGO ne con 32 ft IRE A TOUANMISWIERIS oodaadoodoe acoteducoaooc ane 22 in.
IHE/NMIS cooog oo oongoodemboDusooooddso DD oo Domed O 6 ft LEE SWART (MSIE sonccagonaconaqnoude 192 man-hr
IMKSUGIAAIe cococaSenoscooubosuacuodgonDOGuOUduOUdO 7 ft TRIN GOMES alsioncopicboonucsloomoodcon mone 54 kWh
IDIAVAIFITS Go adtoooenonusggescnogeadcocgnoooeresce 5.3 ft SHEED) (isi NOUg)s GRWIGE cocatooncoceccoueae 1/13-15 hr
WHEIGE (DIRE ooscoract doscsoacoonne coon aT 13 tons IMWYACS ocoomdoccencontodoonanoe 5/0.5 hr
OVSIRVAIPUINIG IISIPUNAIS suocagcés00g0do0ndcoeaKdG 1,200 ft CRIES PIMOS: ascactooror cou vos or nDOEmOoUSOnoUUES 1
(COMLMYNPSS (HP URs cosovosooseogensanoaoecd do 1,800 ft QEBSERIMERS coopoccoadmonontooreouaenong seu 3
L/NUWNKGRI EYNYIES sooaneosiooaoonuocdasooogddeados 1973 LY WHLCYNOY “oLhcaoeooonoad caved oD ooe Onl alwid 2000 Ib

PRESSURE HULL: Cylindrical shape with diver lock-out sphere aft. Hull composed of SA-537 grade A steel to specs. for low temperature
Operations. Hull is 0.5 in. thick; 54-in. 1D and 28.5 ft long. Conning tower is 20 in. high. Hatch to diving compartment is 24-in. diam., diver egress
hatch is oblong and 24-in. x 26-in. diam. Helium sphere is of HY-100 steel.

BALLAST/BUOYANCY: Internal, fore & aft tanks are pumped dry or flooded to obtain +545 Ib (aft) and +170 Ib (fwd) buoyancy. Main (surface)
buoyancy is attained by venting or blowing main ballast tanks of +650-Ib capacity.

PROPULSION/CONTROL: Main propulsion is from a stern-mounted propeller driven by two 10-hp, DC electric motors which have infinitely
variable speed control and are reversible. Two horizontal and one vertical thruster assist in maneuvering. Electrohydraulically controlled rudder and
bow planes assist in underway maneuvering, An automatic pilot controls rudder angle to are}

TRIM: Internal, fore and aft tanks can be differentially filled to obtain up/down bow angles.

POWER SOURCE: Three separate banks of 12-V, heavy duty, lead-acid batteries contained in two pressure-resistant battery pods provide 120-VDC
main power (44 kWh, 20 hr) and 24-V auxiliary power (10 kWh, 20 hr).

LIFE SUPPORT: Gaseous O, is carried external to the hull in four tanks of 288-ft? total capacity. CO is removed by circulating air through a
LiOH (8.2-Ib capacity) cannister. O2 is continuously monitored and CO, is monitored periodically with Drager tubes.

VIEWING: Six viewports in the conning tower and one in the hatch. Aft compartment has a viewport in the egress hatch and two on each side of
the sphere. The forward endcap is fitted with an acrylic plastic dome similar to PC-8.

OPERATING/SCIENTIFIC EQUIPMENT: UQC, gyro compass, depth gage, automatic pilot, echo sounder, scanning sonar.

MANIPULATORS: One with five degrees of freedom.

SAFETY FEATURES: Can blow ballast tanks dry at maximum operating depth. Battery pods are droppable (2,000 Ib ea.). Medical lock in diver’s
compartment.

SURFACE SUPPORT: Support ship the same as for PISCES |, II, III.

OWNER: Vickers Oceanics Ltd., Barrow-in-Furness, England.

BUILDER: Perry Submarine Builders, Riviera Beach, Fla.

REMARKS: Operational. Designated by Perry as PC-15.

237

= SS oe

en
YP ReE

RWAT
TE LEPHONE TRANSDUCER BORW ASD BOUWANCNAUANKS

STERN PLANE

ACCESS
TRUNK

a BATTERY TANK
(ae ee

eae
VERE Sie] | MANIPULATOR

BALLAST KEEL
DROP KEEL

AFT TRIM PROTECTOR

TANK RANGE & DEPTH
DETECTION TRANSDUCER

PROJECTOR

RUDDER DROP KEEL

238

YOMIURI

(Yaoi ccoomepdoooDCODOU BP OUuOUDOUUOUm oro 14.5 m HATCHIDIAMEME Rc meeelelsteteteleteleteleletetelslofelsleleielehsiels 63.5 cm
HSN SeacooppodooUnOoDoOMoo COUOOUDOURoU Good 2.45 m EVRESUPPO RT (MAX) fitereteteteretatetetere/=)elalelelel=iel 492 man-hr
AEG ii ceatet Ve tetelatalelete ele) ehelele!elsierelisi<jcielais/ie\e/eieleilealeters 2.80 m MO MALIROWERM iay-ttareratatercteveleletetaleteterore lous) ote) siey ein 45 kwh
VNR ooconb oopood ROOD OODUOU OOD OOUDUOUOOOUC 2.20m SPEED (KNOTS): CRUISE oo cc ce me ens 2/10 hr
WEEGHi (DER) ei feyotniete lle nein letelsle «ne © loleleieeiniie!e nl 41 tons MAX 22. c ccc etc cece eee eercenne 3/6 hr
OPERATING DEPTH: .... 2... ewww eect e were ees 300 m CREW PIEOMS i iaretetetetenetave tet er otelishetaleletel ole rallaty \ellsiele(elellelletap=ie 3
COLPEAPS ENDER (ecetetalataieyels) vVell)ei=lleleleleleielo isles elle 519m OBSERVERS) wiieseretereteslelelnlalalela\n!e len) se e/«/eie eles 3
LAUNCH DATE: .....-eecerer eee ccesenssccvaree 1964 BANIE OAD) iiiie wieielsteleloreleleeilotstse istrict aleiei\eleie/siiaie!siia\a 1,900 Ib

PRESSURE HULL: Cylindrical shape with one hemi-spherical endcap (stern) and one spherical mirror plate(bow). Hull material is high tensile steel
(46 Hg/mm2), cylinder is 2,05-m OD, 16 mm thick and 10.683-m length. Stern endcap is 1.02-m radius, bow endcap is 2.0-m radius.

BALLAST/BUOYANCY: The superstructure above pressure hull serves as the surface buoyancy tank with a capacity of 8 tons and is blown by
compressed air. A 2-ton-capacity ballast tank is located within the pressure hull which is flooded to descend and pumped dry to ascend.

PROPULSION/CONTROL: A 12-kW, 100-rpm motor drives a 3-bladed, stern-mounted propeller for forward propulsion. A vertical rudder and
horizontal stern plane aft of the propeller provides vertical and lateral maneuvering.

TRIM: Two tanks of 0.4-ton capacity each are within the pressure hull (fore and aft) between which seawater is pumped to obtain desired trim
angles,

POWER SOURCE: Fifty lead-acid batteries within the pressure hull supply main power to the vehicle. An AC motor generator supplies AC power at
60 Hz, 11 V and 1.5 KVA. Battery recharging is performed at the surface by the submersible’s motor generator.

LIFE SUPPORT: 02 is carried in a 46.7-1 flask. CO2 is removed with LiOH scrubbers. During battery charging a fan circulates air in the pressure
hull and the gases generated by charging are removed by absorbing them into the (recharging) diesel engine.

VIEWING: Two viewports are in the bow of the pressure hull and one is in the bottom. They are 120-mm diam. and 62 mm thick and are made of
optically homogeneous glass. Four viewports in the access trunk (conning tower) are 60-mm diam. and 40 mm thick.

OPERATING/SCIENTIFIC EQUIPMENT: UOC, obstacle avoidance sonar, echo sounder, transponder.
MANIPULATORS: One with six degrees of freedom.

SAFETY FEATURES: Breathing masks are provided for each occupant in emergency. Two droppable blocks of 400-kg weight. Skirt under access
trunk can be used to exit the vehicle by pressurizing interior.

SURFACE SUPPORT: Vehicle is towed and supported at dive site by the 34.57-m (LOA), 235.7-ton ship YAMAMOTO.
OWNER: Yomiuri Shimbu Newspaper, Tokyo.

BUILDER: Mitsubishi Heavy Industries, Kobe, Japan.

REMARKS: Not operating.

239

PRESSURE HULLS AND
EXOSTRUCTURES

The first consideration in submersible de-
sign is to provide the occupants with a dry,
pressure-resistant habitat. Secondly, be-
cause volume inside this habitat is generally
limited, an external structure is required to
carry power sources, motors, and other sup-
porting systems. Thirdly, to prohibit this
supporting structure from entanglement or
snagging and minimize hydrodynamic drag,
a smooth external covering or fairing is indi-
cated. Within these major design considera-
tions must be included pressure hull pene-
trations to allow occupant entrance/egress
and external viewing and penetrations for
electrical, hydraulic or mechanical activation
and monitoring of external systems.

241

PRESSURE HULLS

SHAPE

Pressure hull shapes, with few variations,
are predominantly spheres or cylinders in
various combinations (Table 5.1). A sphere is
the most efficient structural form to obtain a
minimum weight-to-displacement (W/D) ra-
tio, an ellipse is second, and right circular,
cylindrical shell reinforced with frames is
last. Two types of end closures have been
used on cylindrical pressure hulls: A hemi-
sphere and an ellipsoid. The most efficient
from a strength-weight ratio standpoint is

TABLE 5.1 PRESSURE HULL SHAPES AND MATERIALS

Depth

Submersible (Ft) Hull Shape Hull Material
HIKINO 20 Sphere Plastic
GOLDFISH 100 Inverted wedge Steel
NAUTILETTE (3 Vehicles) 100 Cylinder Steel
ALL OCEAN INDUSTRIES 150 Cylinder Ashme steel (Jap.); Plastic conning tower dome
PC3-X 150 Stacked cylinders A 285 steel
PORPOISE 150 Shoe-like cylinder Molded fiberglass and resin; Plastic conning tower dome
STAR | 200 Sphere A 212 Grade B steel
SUBMANAUT (Helle) 200 Elliptical Plywood with GRP coating
K-250 (12 Vehicles) 250 Cylinder Steel; Plastic conning tower dome
MINI DIVER 250 Cylinder Welded steel
SPORTSMAN 300 300 Cylinder Welded dimetcoted A-36 steel
SUBMARAY 300 Cylinder Mild steel (boiler plate)
KUMUKAHI 300 Sphere Plastic
PC-3A1& 2 300 Stacked cylinders A 285 steel
NEREID 330 330 Cylinder Steel
SEA RANGER 600 Cylinder A 285 C steel
SPORTSMAN 600 600 Cylinder Welded dimetcoted A-36 steel
SUBMANAUT (Martine) 600 Cylinder Two 10/30 carbon steel shells with honeycombed reinforcement
TECHDIVER (PC-3B) 600 Stacked cylinders A 212 steel
ASHERAH 600 Sphere A 212 Grade B mild steel
BENTHOS V 600 Sphere A 285 C steel
MAKAKAI 600 Sphere Plastic
NEMO 600 Sphere Plastic
PAULO | 600 Cylinder A 212B steel
SURV 600 Cylinder Mild steel plate conforming to BS 1501/1518 (British)
KUROSHIO | 650 Sphere Steel
KUROSHIO II 650 Cylinder Soft steel (SM41) (Japanese)
NEREID 700 700 Cylinder Steel
PC-8 800 Cylinder and Cone Low temperature carbon steel; Plastic bow dome
SHELF DIVER 800 Cylinder SA 212 Grade B firebox quality steel
YOMIURI 972 Cylinder High tensile (46 Hg/mm2) steel
MERMAID 984 Cylinder High tensile steel (St 53.7) (West German)
HAKUYO 984 Cylinder High tensile steel NS46 (Japan Defence Agency standard)
TOURS 64 & 66 984 Cylinder Class G 36 high tensile steel (West German)
GUPPY 1000 Sphere HY-100 steel
NEKTONA 1000 Cylinder A 212 mild steel
NEKTONB&C 1000 Cylinder A 515 mild steel
SEA-RAY 1000 Cylinder Steel
JOHNSON SEA LINK 1000 Sphere & Cylinder Plastic (sphere); Aluminum (cylinder)
SNOOPER 1000 Cylinder A 212 mild steel
PS-2 1025 Cylinder and Cone A 516 Grade 70 steel; Plastic bow dome
PC-14 1200 Cylinder and Cone A 516 Grade 70 steel; Plastic bow dome
STAR II 1200 Sphere HY-80 steel
AQUARIUS 1200 Cylinder A 516 Grade 70 steel; Plastic bow dome
PISCES | 1200 Sphere Algoma 44 steel
VOL-LI 1200 Cylinder SA 537 Grade A steel; Plastic bow dome
VASSENA LECCO 1335 Cylinder
SURVEY SUB I 1350 Cylinder SA 537 Grade A normalized steel

TABLE 5.1 PRESSURE HULL SHAPES AND MATERIALS (Cont.)

Depth

Submersible (Ft) Hull Shape
DEEP DIVER 1350 Cylinder
SP-350 1350 Ellipse
SEA OTTER 1500 Cylinder
DEEP VIEW 1500 Cylinder
SP-500 (2 Vehicles) 1640 Cylinder
SHINKAI 1968 Cylinder and Bi-Sphere
ARGYRONETE 1970 Cylinder
GRIFFON 1970 Cylinder
BEN FRANKLIN 2000 Cylinder
OPSUB 2000 Sphere
SDL-I 2000 Cylinder and Bi-Sphere
BEAVER 2000 Cylinder and Bi-Sphere
DEEP JEEP 2000 Sphere
DEEPSTAR 2000 2000 Cylinder
STAR Ill 2000 Sphere
AUGUSTE PICCARD 2500 Cylinder
PISCES II & II! 3000 Sphere
DSRV-I 3500 Tri-Sphere
DEEPSTAR 4000 4000 Sphere
DSRV-2 5000 Tri-Sphere
TURTLE 6500 Sphere
SEA CLIFF 6500 Sphere
PISCES IV 6500 Sphere
PISCES V 6500 Sphere
PISCES VI 6500 Sphere
DOWB 6500 Sphere
DEEP QUEST 8000 Bi-Sphere
SP-3000 10082 Sphere
ALVIN 12000 Sphere
FNRS-2 13500 Sphere
FNRS-3 13500 Sphere
ALUMINAUT 15000 Cylinder
DEEPSTAR 20000 20000 Sphere
TRIESTE II 20000 Sphere
TRIESTE 36000 Sphere
ARCHIMEDE 36000 Sphere

the hemisphere. Figure 5.1 shows the types
of combination and constructions reportedly
used to date. To a depth of 2,500 feet the
cylinder with hemi-heads dominates, and the
sphere is secondary. The remaining vehicles
in this depth range are a combination of
cylinders and spheres and an inverted wedge
and ellipse. Below 2,500 feet only one (ALU-

243

Hull Material

Rolled and Welded T-I steel; SA 212 Grade B steel
Forged mild steel

A 212 B mild steel

HY-100 steel; Borosilicate glass endcap.
Steel

High tensile steel

High yield strength (SMR-type) steel
Steel

Aldur steel and Welmonil steel (West German)
HY-80 steel

HY-100 steel

HY-100 steel

A 225 B steel

HY-80 steel

HY-100 steel

Aldur 55/68 cylinder; Aldur 55 end caps (West German)
A 242 steel

HY-140 steel

HY-80 steel

HY-140 steel

HY-100 steel

HY-100 steel

HY-100 steel

HY-100 steel

HY-100 steel

HY-100 steel

18% Ni 200 KSI grade Maraging steel
Vascojet 90 steel

Titanium 621.08

Ni-Cr-Mo cast steel

Ni-Cr-Mo cast steel

Aluminum alloy 7079-T6

HY-140 steel

HY-120 steel

Ni-Cr-Mo forged steel (Krupp)
Ni-Cr-Mo forged steel

MINAUT) out of 22 vehicles uses a cylinder
with hemi-heads; the rest employ spheres.
The spherical pressure hull is the most
weight efficient geometry but is least amena-
ble to efficient interior arrangements. The
cylinder provides an efficient utilization of
internal volume but is geometrically ineffi-
cient with respect to W/D as is a sphere. As

SPHERE

BI-SPHERE
(STAR 1) (DEEP QUEST)
TRI-SPHERE
(DSRV)
SPHERE CYLINDER
(BEAVER)
CYLINDER
(ALUMINAUT)
ELLIPSE
(SP-350)

=e

CYLINDER/CONE
INVERTED (PC-14)
WEDGE
(GOLDFISH)

Fig. 5.1 Basic pressure hull shapes.

depth increases the cylinder must be eter sphere is presented in Table 5.2. Table
strengthened by frames and thereby weight 5.3 lists the relative major advantages and
is added to the detriment of the W/D ratio. disadvantages of three basic configurations.
An example of W/D ratio as related to shape It is important to note that introduction of
and sphericity (in this case 81/s-inch devia- lightweight materials into pressure hulls
tion from the nominal radius) in an §-ft-diam- permits greater operational depths while

244

TABLE 5.2 POTENTIAL PRESSURE HULL CONFIGURATIONS AND W/D RATIOS
CONSIDERED FOR THE DSRV. [FROM REF. (1)]

Material Shape

HY-130(T)

Weight/D isplacement

Near Ag = 1.8 in. Ag = 1.8 in.
Perfect Stress-Relieved As Fabricated
0.39 0.46 0.51
0.40 — —-

0.41 0.48 0.53
0.42+ 0.49+ 0.54+
0.43 ae 0.49
0.42 — 0.47

TABLE 5.3 ADVANTAGES AND DISADVANTAGES OF SUBMERSIBLE PRESSURE HULL SHAPES

Advantages

Sphere iJ: Most favorable weight to displacement ratio

7d, Thru-hull penetrations easily made

3. Stress analyses more accurate and less comp
Ellipse I Favorable weight to displacement ratio

7. More efficient interior arrangements

3. Thru-hull penetrations easily incorporated
Cylinder Ub Fabrication easiest

2. Most efficient interior arrangements

3. Low hydrodynamic drag

maintaining a lower or equal W/D ratio. Such
is the case with the aluminum ALUMINAUT
and ALVIN. The latter increased its operat-
ing depth from 6,000 to 12,000 feet, and also
decreased its W/D ratio by replacing its HY-
100 steel hull with titanium.

lex

245

Disadvantages

1. Difficult interior arrangements

2: Large hydrodynamic drag

le Fabrication expensive
Qe Structural analysis difficult
15 Least efficient weight to displacement ratio

2. Stiffeners (internal) required at great depths
(1,000-ft)

3. Structural analyses techniques difficult for
cylinder thru-hull penetrations

Two major factors controlling both pres-
sure hull shape and material are the vehi-
cle’s projected maximum operating depth and
payload. Both values are derived from the
basic role the vehicle is expected to perform
and within what range of ocean depths. Ar-

0 )
1000
2000 5000
3000
4000
10,000
z 5000
a
2
= 6000 Fe
ao Wi
15,000
=) Ww ,
7 7000 2
Ww
=
& 8000 =
2) Ww
& 9000 ° 20,000
=
S
© 10,000
S
+ 11,000 25,000
12,000
a 30,000
14,000
15,000
35,000
16,000
) 10 20 30

40

50 60 70 80 90 100

PERCENT OF OCEAN LESS THAN INDICATED DEPTH

Fig. 5.2 Percent of ocean bottom at various depth levels.

riving at an operating depth is not quite as
easy as it may appear, especially if the vehi-
cle is intended to be leased or used by a
variety of customers. While this problem has
somewhat diminished owing to a lack of in-
terest (funds) on the part of potential deep-
diving customers, it still persists owing to
varying depths of interest among scientific
and commercial users, the relatively un-
known location and quantity of potential ma-
rine resources and the increasing vehicle
cost with increasing depth capability.

The owner must weigh all of the above
factors to arrive at a useful, economic depth
of operation. Unfortunately, the ocean bot-
tom does not provide much assistance. Fig-
ure 5.2 presents the percent of the ocean
bottom vs. depth, as well as the number of

246

submersibles within various depth ranges.
Approximately 8 percent of the ocean bottom
is located at continental shelf depths (0-600
feet). From this depth downward the per-
centage of bottom attainable increases
slowly at the cost of greatly increased depth
capability. For example, the 1,200-ft STAR II
can reach 10 percent of the ocean bottom,
while the far more complex and expensive
8,000-ft DEEP QUEST does not quite double
this percentage. Unquestionably, the least
gain in percentage of accessible bottom is
from 20,000 feet to 36,000 feet, where the
percentage of increase is from 98 to 100,
respectively. The depth decision was particu-
larly difficult in the early sixties when the
incipient field offered few clues to depth of
interests; from the late sixties on a trend

towards shallower, continental shelf-capable
vehicles was brought about by the newly
emerging offshore oil customer. As this cus-
tomer goes ever-deeper in his quest for pe-
troleum, the problem of defining a depth
limit to an oil industry-oriented vehicle be-
comes increasingly difficult. In essence, the
selection of an optimum depth is difficult,
and to err on the side of excess may spell the
difference between profit or loss for the com-
mercial lessor.

MATERIALS
Pressure hull materials are metallic and
non-metallic; regardless, all physical proper-
ties must be characterized and taken into
account during the process of material selec-
tion in order to provide a design which will
perform successfully in the ocean environ-
ment. Such materials and their welds or
bonding materials must be characterized to
account for the following during the material
selection phase:
Corrosion: The deterioration of a metal by
chemical or electrochemical action within
its evironment,
Stress-Corrosion Cracking: Failure by flow
propagation under combined action of a
flaw and tensile stress,
Low Cycle Fatigue: Fracture under fluc-
tuating stresses having a maximum value
less than the tensile strength of the mate-
rial. (Low cycle is less than 100,000 fluctua-
tions in pressure),
Creep: Time dependent plastic deformation
(permanent change in size or shape of a
body) occurring under stress,
Stress Relief Embrittlement: Reduction in
the normal ductility of a metal when it is
heated to a suitable temperature and then
slowly cooled to reduce residual stresses,
Brittle Fracture: Fracture with little or no
plastic deformation which occurs in some
metals at low temperatures,
High Strength to Density Ratio: (defined
previously),
High Ductility: The ability to deform plas-
tically without fracturing,
Fracture Toughness: The ability to deform
plastically in the presence of a thru-hull
crack without catastrophic propagation
and failure,

247

Weldability: Suitability of a metal for weld-
ing under proper conditions,

Formability: The relative ease with which
a metal can be shaped through plastic
deformation, and

Reproducibility: The process of production
being such that the material can be se-
quentially produced to closely approximate
its predecessor in all properties.

Equally important are the developmental
and fabrication cost and the availability of
the candidate material.

Submersible pressure hull materials con-
sist of steel, aluminum, titanium, acrylic
plastic, glass and wood (Table 5.1). Steel, at
90 percent, constitutes the overwhelming
majority of pressure hulls—primarily be-
cause of the high degree of knowledge availa-
ble to the designers and fabricators and the
large amount of experience with respect to
its performance in the ocean.

The technical literature devoted to pres-
sure hull material candidates and their char-
acteristics is voluminous. Almost all deal
with materials for deep (greater than 1,000
ft) diving, with too little attention paid to
shallow diving. This is unfortunate in view of
the present trend toward shallow, rather
than deep, submersibles. One might theorize
that sufficient is known of materials for shal-
low vehicles, but this is not always the
case.For example, a portion of DEEP DI-
VER’s pressure hull consists of a grade of T-1
steel which, when a flaw is present in a
tensile stress field, is subject to brittle frac-
ture at low temperatures. While this steel
might be acceptable in certain ocean areas,
or by employing design and fabrication tech-
niques which would preclude tensile stresses
and minimize the flaw size, it was not accept-
able to the U.S. Navy (2). They declined
material certification because of the lack of
material characterization (fracture mechan-
ics properties) and the potential existence of
flaws and residual tensile stresses in weld-
ments.

The reason for the trend toward high
strength steels is their high yield stress,
acceptable fatigue and fracture properties
and fabricability.

At the very least, submersible develop-
ment and operations in the decade of the

STEEL

20,000
ALUMINUM
30,000
COLLAPSE
DEPTH IN
FEET 40,000 TITANIUM

50,000

GLASS

0.2 0.3 0.4 0.5 0.6
WEIGHT OF SPHERE

WEIGHT OF DISPLACEMENT
IN SEAWATER
a) [After Bernstein, Ref. (4)]

QUALITATIVE COMPARISON OF FACTORS INFLUENCING
SELECTION OF MATERIALS FOR HYDROSPACE VEHICLES

S — STEEL

AL — ALUMINUM

TI-TITANIUM
GP—GLASS-REINFORCED PLASTIC
CG—CAST GLASS

S AL TI GP CG S AL TI GP CG S AL Ti GP CG S AL TI GP CG S AL Ti GP CG

STRENGTH/DENSITY DESIGNABILITY FABRICABILITY PRODUCIBILITY ECONOMY

b) [After Gross, Ref. (12)]

Fig. 5.3 a) W/D ratio vs. collapse depth of five material candidates for spherical pressure hulls.
b) Qualitative comparison of pressure hull materials.

248

sixties put to rest a number of “‘can’ts’”’ and
“undesirables” in regard to materials for
pressure hulls. Let us look at two examples:

1. Aluminum was considered by many to
be unacceptable as a pressure hull ma-
terial because it is unweldable and sub-
ject to stress-corrosion cracking. How-
ever, ALUMINAUT’s designers simply
bolted its cylindrical sections and hemi-
spherical endcaps together, and placed
sacrifical anodes at various locations
about the hull; ALUMINAUT performed
successfully for several years before its
retirement in 1970 (3).

2. Bernstein (4) relates that tests at the
Naval Applied Science Laboratory in
early 1965 disclosed that the titanium
alloy Ti-721 was also susceptible to
stress-corrosion at high tensile stress
levels, but in 1973 ALVIN was fitted
with a titanium pressure hull using an
alloy insensitive to this problem.

A major innovation in pressure hull mate-
rials grew out of the introduction of acrylic
plastic viewports by Piccard, which has since
led to complete pressure hulls of this mate-
rial. Dr. Jerry Stachiw, the leader in the
research and development efforts leading to
the acceptance of acrylic plastic by the U. S.
Navy, presents a quasi-technical account of
the development and fabrication of acrylic
pressure hulls from NEMO through to the
JOHNSON SEA LINK (5). More technical and
detailed accounts are presented in refer-
ences (6-10).

Equally innovative and promising is the
introduction of glass as an endcap for DEEP
VIEW. This application grew out of the early
work with HIKINO under Mr. Will Forman
at China Lake, California. Though DEEP
VIEW is only certified to 100 feet, its design
is experimental for the purpose of overcom-
ing some of glass’s shortcomings, such as its
brittleness, high sensitivity to surface abra-
sion, and considerable strength degradation
at joints (11). The advantages of both acrylic
plastic and glass are a low weight/displace-
ment ratio and panoramic visibility. Figure
5.3a shows the variations of collapse depth
for spherical hulls of various materials
against W/D ratio; the advantages in this
area are clearly in favor of glass and glass
reinforced plastic (GRP) for deep diving.

While some materials are clearly favored
in some areas, others offer advantages of
their own which must be weighed against
the favorite. Figure 5.3b compares five candi-
date materials and their advantages and dis-
advantages.

While titanium, glass and GRP will un-
doubtedly see a future in manned submers-
ibles, provided the material development
cost is not prohibitive, steel continues to be
the prime candidate; according to Ballinger
and Garland (13) the best of these steels are
HY-100, HY-140, HP9-4-20 and 18 percent
nickel maraging steel, the chemical analyses
and mechanical properties for which are
given in Table 5.4; both are taken from the
same report.

TABLE 5.4 CHEMICAL ANALYSIS OF STEELS
FOR SUBMERSIBLE VEHICLE PRESSURE HULLS [FROM REF. (13)]

c Mn P Ss Si

Ni Cr Mo Vv Co Ti Al

HY-100 0.20Max 0.10/0.40 0.25Max 0.25Max 0.15/0.35 2.25/3.50 1.00/1.80 0.20/0.60 0.03 Max — 0.02 Max —

HY-140 0.12Max 0.60/0.90 0.01 Max 0.01Max 0.20/0.35 4.75/5.25 —0.40/0.70 0.30/0.65 0.05/0.10 = 0.02 Max ==

HP9-4-20 0.17/0.23 0.20/0.30 0.01Max 0.01Max 0.10Max 8.5/9.5 0.65/0.85 0.90/1.10 0.06/0.10 4.25/4.75 — ==

18% NI 0.03 Max 0.10Max 0.01Max 0.01Max 0.10Max 17.50/19.00 — 3.50/4.50 —_ 7,00/8.00 0.05/0.25 0.05/0.15

Maraging

TYPICAL MECHANICAL PROPERTIES FOR STEELS FOR DEEP
SUBMERSIBLE PRESSURE HULLS [FROM REF. (13)]

0.2% Offset

Yield Strength Tensile Strength

Charpy V-Notch Kic¢ Modulus

Material KSI KSI Fr/Lb KSI Vin. EX 10° psi
HY-100 100 120 >50 @ -120°F 30
HY-140 140 155 60 to +120 @ OF > 150 30
HP 9-4-20 180 215 50 @0°F > 150 29

18% NI 175/200 190/215
Maraging

35 @ Room Temp. 100/120 20

249

Only one submersible is known with wood
as a pressure hull material, the Helle SUB-
MANAUT. Stachiw (14) reported tests at the
U.S. Naval Civil Engineering Laboratory
with mahogany plywood cylinders and, by
virtue of its low density (0.016 lb/in.) and a
strength to weight ratio better than that of
hot or cold rolled low carbon steels, found it
to be quite suitable for depths less than 2,000
feet. Remarking on its low cost and easy
workability, Stachiw recommends it as a can-
didate material for individuals or institu-
tions where limited construction budgets
prevail.

An equally promising, and unexpected, ma-
terial is concrete (Fig. 5.4). Using an espe-
cially formulated concrete mix, Stachiw (15)
tested 16-inch-diameter, 1-inch-thick con-
crete spheres, with no reinforcement, to de-
struction and subjected them to long-term
pressure. Two hemispheres were joined with
8288-A Epocast furane epoxy after curing for
1 month in a 100 percent humidity room. One
puzzling aspect of the tests was that while
permeability of the concrete to seawater was
low (5 ml/hr at 1,500 psi), the salinity of the
water inside the sphere was less than that
outside. Although more testing is required to
man-rate such materials, Stachiw recom-
mends its use for fixed installations to 3,500
feet where positive buoyancy is required.

FABRICATION

The joining together of the pressure hull
components—hemisphere-to-hemisphere cyl-
inder-to-endcap, ete.—has been accomplished
in several ways: Welding, bolting, adhesive
bonding, clamping, and retaining rings.
Though relatively straight-forward in a
metal-to-metal bond, the problem becomes
quite complex with bonds such as glass-to-
metal.

Welding:

The majority of submersible pressure hulls
are joined together by welding; both the
welding material’s physical properties and
the welder himself are governed by well-
defined military or civil (commercial) regula-
tions. The welding material should be the
equivalent of the parent (pressure hull) ma-
terial and stored under exacting conditions

to control moisture content which could gen-
erate nascent hydrogen in the weld and
thereby weaken it. The U.S. Navy has estab-
lished MILSPECS which govern welding ma-
terial and the storage thereof. The American
Society of Mechanical Engineers has defined
requirements for welding of various pressure
vessels for use by the commercial sector.

Similarly, both groups have requirements
and tests which the welder must pass and
efficiency levels he must maintain. Such
tests include welding in different positions
such as downhand and overhand, and sub-
jecting the welds to various bending, pulling
and impact tests, as well as to X-ray and
ultrasonic inspection. In the case of BEN
FRANKLIN, a dye penetrant system served
as an additional test of the welders’ effi-
ciency (16).

Fabrication of the BEN FRANKLIN hull
(Fig. 5.5) employed both welding and bolting
techniques, and the checks and treatment
during fabrication incorporated the majority
of procedures followed in all steel-hulled ve-
hicles. Two European steels, Aldur (77,800

Fig. 5.4 Short cylindrical concrete hull shown prior to epoxy bonding of hemisphere
caps onto cylinder section. (NCEL)

psi yield) and Welmonil (71,500 psi yield)
were used in the cylinder and hemispherical
endcaps, respectively. These possess proper-
ties quite similar to HY steels. The cylindri-
cal portion of the hull was fashioned from six
sections of rolled steel cold-formed to cylin-
drical shape in a plane-rolling machine and
the longitudinal joint hand-welded. Sixteen
stiffener rings were fabricated of Aldur steel
and, when finished, placed on a special jig
where the cylinders were heated to 200°C
and lowered over the ring stiffeners. The
rings were welded to the cylinders at an
ambient temperature of 150°C. The endeaps
were formed of seven orange-peel sections
cut out of plate steel and forged to the shape
of a hemisphere at 900°C. The seven cylindri-
cal sections and endeaps were tack welded
together and then the main circumferential
welds made automatically outside and by

i

Fig. 5.5 BEN FRANKLIN's pressure hull. (Grumman Aerospace)

251

hand inside. Brackets and clips were welded
at various locations outside the hull for later
attachment of ballast tanks, motors and the
like. Extra attachment points were included
to provide for future growth or modifications
of the vehicle. Welding such brackets or clips
to the hull after it has been completed should
be avoided as it introduces high local resid-
ual stresses which, in general, are impracti-
cal to stress relieve by heat treatment after
the hull has been finished and outfitted.

When all welds were completed and
checked, the two sections were stress re-
lieved, or heated, to remove residual stresses
in both the parent and weld materials. This
procedure consisted of heating the hull to
525°C and holding it there for 3.5 hours (2
minutes for each mm of thickness) and then
slowly cooling it in still air.

As described, BEN FRANKLIN’s endcaps

were formed by the welding of orange pee!
sections to form a hemisphere; not all hemi-
spheres are formed in this manner. ALVIN’s
spherical pressure hull is composed of two
hemispheres, both of which were originally
flat, steel discs subsequently placed on a
spinning table while a hydraulically-powered
roller applied pressure over a form to shape
the disc into the desired hemisphere (Fig.
5.6). This same procedure, hot spinning, was
used to form the hulls of DEEP QUEST, the
DSRV’s, GUPPY, and several other U.S. sub-
mersibles.

Following another complete inspection of

the welds of BEN FRANKLIN, over 2,000
measurements were made to check hull
straightness and circularity. Radius toler-
ance is +5 mm of the theoretical radius at
any point; straightness tolerance is +2.5 mm
from a straight line between any two adja-
cent stiffeners. Both sections were sand-
blasted and painted with two coats of zinc-
based epoxy and one coat of paint.

The two sections, flanges welded in each
and machined to 1.25-inch thickness, were
bolted together with 60 bolts. A shoulder
projects from the aft section into the forward
section to transfer shear loads at the joint.

Fig. 5.6 Hot spinning ALVIN's pressure hull Roller at left of picture applies pressure while the steel sphere is spun and maintained at a high temperature. (WHOI)

An “O” ring groove was machined in the
forward flange to hold a 9-mm-diameter neo-
prene ring which provides a watertight seal
at low pressure. Metal-to-metal contact of
the flanges during deep submergence serves
as a high pressure seal. BEN FRANKLIN
was bolted together to accommodate future
plans for a diver lock-out module which could
replace the original aft section. The finished
hull prior to bolting is shown in Figure 5.5.

Bolting:

Where the pressure hull material is essen-
tially non-weldable it may be bolted to-
gether. ALUMINAUT serves as an example.
ALUMINAUT?’s pressure hull (Fig. 5.7) is com-
posed of 11 cylinders and 2 hemispherical
endcaps. Thirteen huge aluminum ingots
(17,000 lb each) were cast as rectangles and
then heated and forged under hydraulic
presses into a cylindrical shape. The centers
were then punched out and the partially
shaped pieces transferred to a ring rolling
machine and rolled to their final contour;
these and the endcaps were later machined

to critical tolerances of 32-microinch finish
on all joint faces (17). The pieces, after sand-
blasting, received four coats of different col-
ored polyurethane paint 0.002-inch thick to
show surface scratches. Flanges were then
bolted to each cylinder and then bolted to-
gether. The selection of bolts and the bolting
procedures were practically laboratory con-
trolled. After initial jig drilling, bolt holes
were reamed to tolerances of 0.0005 inch or
better in roundness and 0.001 inch for size.
Some 400 bolts are used in the hull; each bolt
and bolt hole was measured individually and
matched to each other for the best fit. Each
bolt was then shrink-fitted by cooling it in
liquid nitrogen at —320°F prior to insertion
and allowed to expand to a degree where no
bolt diameter exceeded hole diameter by
more than twelve ten-thousandths of an inch.
In this case, there was no intention of later
unbolting sections as with BEN FRANKLIN.

Adhesive:
On plastic-hulled vehicles neither bolting
nor welding is feasible; hence, an adhesive or

Fig. 5.7 ALUMINAUTs pressure hull. (Reynolds Submarine Services)

glue is used. In the case of NEMO, 12 spheri-
cal pentagons were made by first sawing
dises from a flat sheet of Plexiglas G (Rohm
& Haas), and then molding the flat dise to
the desired spherical shape. Each sphere was
then machined to a pentagonal shape. The
pentagons were then placed in an assembly
jig (six at a time) until two quasi-hemi-
spheres were formed which were then
bonded to each other (Fig. 5.8). In bonding
operations the pentagons were spaced 0.125
inch apart with plastic spacers and the joint
on each side was covered with an adhesive
backed aluminum foil (Scotch Brand No.
425). Swedlow’s proprietary casting material
SS-6217 was used to bond the pentagons
together (18). Bubbles, visible in the bonding
cement, were removed by machining or drill-
ing and, after an annealing process, the
areas to be repaired were filled with SS-6217.

Two conical steel (cadmium plated 4130
steel) end plates are at the top and bottom of
the sphere; the former is the hatch and the
latter is for thru-hull penetrations. These
are held in place by retaining rings.

Clamping:

The present TRIESTE IT has two hemi-
spheres, manufactured by Hahn and Clay, of
a high yield steel (HY-120); the weldability of
this material is unknown. Consequently, a
circumferential flange was machined along
the outer edge of each hemisphere; the two
sections were aligned by means of an align-
ment groove. Then a bolted “C” type clamp-
ing ring was fitted over both flanges around
the entire sphere to hold both halves to-
gether (Fig. 5.9). An O-ring outboard of the
alignment groove serves as a low pressure
seal. The original Krupp sphere was of three
sections (two disk-like endeaps and a central
cylinder-like section). The three sections
were originally bonded together by epoxy
resin, but this glue failed, and the sphere
was subsequently held together by six metal
bands gripping two metal rings top and bot-
tom.

Glass-to-Metal:

A special situation exists with joining
glass to metal as in DEEP VIEW. The soft-
ness of glass, its low Young’s Modulus and
high Poisson’s ratio, makes it difficult to
mate with metals which generally have the

254

Fig. 5.8 The plastic hull of NEMO after bonding together of twelve spherical
pentagons. (NCEL)

SIGHTING PORT

ACCESS HATCH

PLEXIGLASS WINDOW

CLAMPING RING

Fig. 5.9 Centerline section of TRIESTE //'s pressure hull. Note tapered reinforce-
ment at viewport.

opposite characteristics (19). Following many
trials and testing by W. R. Forman and his
associates at NUC, the edge of the hemi-
sphere joining the steel cylindrical pressure
hull was ground round to a radius equal to
one-half the shell thickness and a neoprene-
coated nylon gasket was fitted between the
two (Fig. 5.10). This configuration and very
careful fitting eliminated edge failures. A
titanium retaining ring holds both glass end-
cap and steel cylinder together.

HULL PENETRATIONS

Unlike large military submarines, a sub-
mersible’s interior is quite limited, and items
such as batteries and motors are frequently
located outside the pressure hull. All sub-
mersibles have one or more thru-hull pene-
trations which serve as: Personnel access
hatches, viewports, and hydraulic, electric,
and mechanical penetrations.

If such openings are small in comparison
to the pressure hull dimensions, the stress
level in the area adjacent to the opening is
not significantly altered. If the opening is
comparatively large, as are hatches and
viewports, reinforcement of the area immedi-
ately adjacent to the opening is required
(Fig. 5.11). In general a tapered reinforce-
ment is used, especially for viewport pene-
trations. Such reinforcement can be of con-
siderable thickness; for example, TRIESTE’s
Terni sphere ran from a thickness of 3.5
inches to 6 inches around the viewports.
Stresses around viewports have been studied
and results for the ALVIN viewports are
presented in reference (20). In the case of
hatches, it is possible to machine both hatch
and hull mating surfaces to ensure that the
hatch acts as an integral part of the hull and
thereby minimizes the thickness of the rein-
forcement (21); for this reason no reinforce-
ments are seen around TRIESTE’s access
hatch.

The majority of penetrations in cylindrical
pressure hulls are found in the endcap hemi-
spheres, the reason being that most of the
external equipment is located adjacent to
the enclosures. When large penetrations are
required and present major structural dis-
continuities, such as the intersection of two
spheres or two cylinders, the designer must

255

employ generalized structural analysis com-
puter programs, i.e., finite element or finite
difference, to determine the configuration
and size of the reinforcement. A final verifi-
cation of the stress magnitude and displace-
ment is obtained by placing the entire hull in
a chamber where the pressure is raised to
various levels and measuring the values ex-
perimentally. However, large submersibles
of the BEN FRANKLIN variety are too large
for this procedure; hence, experimental
stress verification data is obtained during
the submersible’s sea trials. A standard rule
of the ASME Pressure Vessel Code for exter-
nally pressurized structures is that the rein-
forcement shall consist of 100 percent of the
material taken from the hull. For example, if
2-inch-diameter pipe is to pass through a 1-
inch-thick hull, then the 3.14 cubic inches of
material must be replaced as reinforcement

———_ METAL

Fig. 5.10 Cross section of glass to metal joint. [From Ref. (19)]

Fig. 5.11 Reinforcements and retainers for the pressure hull of ALVIN showing window retainers (background), lift padeyes (center), penetrator shims (right and foreground) and
release hooks (center foreground). (WHOI)

with a taper of 4.1; viewport reinforcements
in deep submersibles are slightly less than
100 percent.

Hatches:

The majority of hatch or personnel access
openings are circular and designed to fit asa
cone in the pressure hull; the smallest of
these is in the DEEP STAR-series vehicles
where 15.75-inch diameter prevails. Two ex-
ceptions to the above generalization exist: 1)
certain shallow-diving vehicles, e.g., PC-3A 1
& 2, NEKTON A,B,C, where the hatch is a
circular dome disk and fits flush over a cylin-
drical conning tower (Fig. 5.12) and 2) certain

256

lock-out vehicles where the hatch may be
oval shaped. The reason for an oval shape in
the lock-out vehicles, though not immedi-
ately apparent, is really quite simple and
compelling. Within the lock-out portion of a
submersible the internal pressure may not
only equal, but may exceed, ambient (exter-
nal) pressure during decompression on the
surface. For this reason a double-acting
hatch is required. This takes the form of an
internal hatch and an external hatch. In
order to initially install or remove the inter-
nal hatch from the pressure hull the access
opening must be other than circular, other-
wise it would be impossible to insert the
larger diameter circular hatch through a
smaller diameter penetration.

Fig. 5.12 Hatch and cover of NEKTON GAMMA

Electrical:

There is a wide variety of electrical hull
penetrations (Chap. 7) which serve an
equally wide variety of functions. Basically
the penetrator is sealed by an O-ring to
prevent low pressure leakage and a hard
metallic backup ring for a metal-to-metal
seal at high pressure. Figure 5.13 presents
the design of a penetrator for DEEP QUEST.
By tightening the retaining nut the joint can
be made to seal properly.

Mechanical:

Because of the tremendous pressures ex-
erted on the hull of a deep-diving submers-
ible, thru-hull rotating or reciprocating me-
chanical shafts and linkages are generally
avoided. If the propulsion motor, for exam-
ple, was located within the hull and rotated a
propeller-driven shaft which penetrated the
hull, a dynamic seal capable of limiting the
leakage of seawater into the hull at differen-

257

OUTBOARD

'O” RING
_= HEADER

_= HULL FITTING BODY

— HULL

INBOARD

—— POTTING

SPACER

WASHER

— RETAINER NUT

LOCKING NUT

MOLDED BOOT

ELECTRICAL
CONDUCTORS

Fig. 5.13 DEEP QUEST's electrical penetrator.

tial pressures of perhaps 7 or 8 thousand psi
would be required; dynamic seals for these
pressures are not available. To further com-
plicate the problem, the pressure hull itself
is not structurally stable and can be ex-
pected to shrink as the vehicle goes deeper.
ALUMINAUT is calculated to lose 1 inch in
length and 0.1 inch in diameter at 15,000 feet
(17). Such characteristics further complicate
the difficulties of mechanical penetrations on
deep submersibles (greater than 1,000-ft
depth), and is a prime reason for their gen-
eral absence.

Nonetheless, mechanical penetrations are
included on the shallow vehicles and in some
cases on deep vehicles where their advan-
tages are seen to outweigh their disadvan-
tages. The following presents the functions
of mechanical penetrators found on vehicles
today.

a) Propellers and Thrusters: In vehicles
such as SEA OTTER, DEEP DIVER and the
NEKTON series, the main propulsion motor
is housed in a watertight box penetrated by
a shaft to drive the main propulsion unit ora
thruster. The motor container is separate
from the hull as a safety precaution, and the
shaft, in DEEP DIVER’s case, is sealed by a
shoulder bearing against two sleeves
screwed into the penetration and an O-ring
for low pressure protection.

b) Dive Planes and Rudders: Some shallow-
diving vehicles include hull penetrations for
manual control of diving planes and rudders.

c) Hatch Shafts: Several vehicles include a
mechanical penetration through the hatch
which serves as a leverage or rotating point
around which the hatch seals are closed or
opened (Fig. 5.12).

d) Weight Drop Shafts: The greatest num-
ber of mechanical penetrations are for the
purpose of dropping weights, generally in an
emergency, to gain positive buoyancy. This
type of penetration only rotates in one plane
and is preferred over electric weight drop-
ping actuators owing to the possibility of
electrical failure. ALVIN incorporates such
an arrangement to separate the sphere from
the entire exostructure.

e) Manipulators: The NEKTON-class sub-
mersibles provide a mechanical penetration
for a 3-ft-long steel rod which is manually

258

pushed out or pulled into the vehicle. The rod
incorporates a claw at its outer end and can
grasp samples as desired. According to Dr. R.
F. Dill (NOAA, personal communication), at
1,000 feet the pressure shrinkage of the hull
causes the arm to come down with “arthri-
tis,’ and considerable effort is required to
manipulate the device.

f) Hull Vents: Several submersibles con-
tain penetrations for replenishing the pres-
sure hull air or to equalize hull air pressure.
In the first case snorkels are employed for
surface cruising. In the latter case (BEA-
VER) a valve is activated in an emergency
which brings main ballast air into the hull
and builds pressure up to ambient so that
the passengers may open the hatch and exit.
The All Ocean Industries’ submersible has a
curious arrangement whereby the main bal-
last tanks vent into the pressure hull. To
prevent a buildup of air pressure a second
valve, connected to a snorkel, is opened and
the air vents outboard. The operating in-
structions for the submersible cautions the
operator to secure the ballast tank vent
valve as soon as a little water appears in-
board.

Viewports:

In an extremely detailed and comprehen-
sive paper, NCEL engineers Snoey and
Stachiw (22) present the history, application,
advantages and disadvantages of materials
and shapes for submersible viewports. The
basis for their report rests in a series of
exhaustive tests and analyses of viewports
and their materials at NCEL. The reader is
referred to this report and its references for
detailed aspects of viewport design and ma-
terials capabilities.

Three materials have been used for view-
ports: fused quartz, acrylic plastic and glass.
The first of these was used by Beebe in the
BATHYSPHERE, but his difficulties with
cracking and chipping persuaded the elder
Piccard to look for an alternative, which
proved to be acrylic plastic. Acrylic plastic is
now the accepted viewport material for all
but two submersibles; KUROSHIO II and
YOMIURI both use glass.

Table 5.5 presents the properties of glass
and acrylic plastic. In essence, where one is
strong, the other is weak. According to refer-

TABLE 5.5 PROPERTIES OF MATERIALS [FROM REF. (22)]

Acrylic Plastic Glass
Property Rohm & Haas Corning PYREX Units
PLEXIGLAS G Code 7740
Tensile Strength (Maximum) 10,500 10,000 psi
Modulus of Elasticity (Tensile) 450,000 9,100,000 psi
Compressive Strength (Maximum) 18,000 300,000 psi
Modulus of Elasticity (Compressive) 450,000 9,100,000 psi
Flexural Strength (Maximum) 16,000 35,000 psi
Shear Modulus 166,000 3,900,000 psi
Impact (Charpy) 14.0 Very low and ft-lb/in.2
Scattered
Poisson's Ratio 0.35 0.2 -
Hardness Rockwell M-93 Knoop 481 ~-
Deformation Under Load 0.5 0 %

(4,000 psi @ 122°F, 24 hr)

Specific Gravity 1.19 2.23 =

Specific Heat 0.35 0.233 Btu/Ib°F
Coefficient of Thermal Conductivity 0.11 0.92 Btu/hr ft°F
Coefficient of Thermal Expansion 40 x 10°6 1.78 x 10°6 in./in./°F
Water Absorption 0.2 0 %
Corrosion Resistance Excellent Excellent -
Refractive Index 1.49 1.47 -

Light Transmission 92 90 %

ence (22) there are three major disadvan- yielding. The tensile stresses usually
tages with glass as viewport material: stem from glass/metal interfaces.

3) Glasses fail catastrophically without
any prior yielding or permanent defor-
mation that might serve as warning.

On the other hand, plastic offers the follow-
ing advantages:

1) Poor reproducibility in mechanical prop-
erties from one manufactured specimen
to another stemming from inadequate
quality control.

2) Occurrence of tensile stresses in designs 1) Reproducibility in physical properties
for a material that has low tensile from one viewport to another is excel-
strength and no tolerance for localized lent.

259

2) The low modulus of elasticity and plas-
tic flow characteristic permit localized
yielding and redistribution of stresses.
The plastic flow in the form of extrusion
and extensive fracturing provides warn-
ing of impending failure sufficiently in
advance to terminate a dive without the
viewport imploding.

Another report (23) states that before
failing plastic becomes translucent, but
this was not reported in the NCEL stud-
ies.

For such reasons acrylic plastic is the
prime viewport material in submersibles.
That plastics will remain in this exclusive
position is difficult to predict. According to
Edgerton (24), glass has the advantage of
less optical distortion than plastic, and from
Figure 5.3, it is clear that glass offers the
best W/D ratio. The present difficulty in
working with glass primarily reflects its
newness as a candidate for pressure hulls.
Acrylic plastic also offered initial difficulties,
but years of research and testing have
brought it to the point where it will advance
from a Category III to a Category II mate-
rial (see Chap. 13) after long-term loading
tests, now in progress, are completed to de-
termine its creep and fatigue characteristics.
If the need for glass as a pressure hull,
viewport or other component material be-

3

wm

4

wm

PRESSURE
HULL

PACKING MATERIAL

VIEWPORT

comes pressing, it is likely that the technol-
ogy will evolve to overcome its present defi-
ciencies.

Three configurations are used to join
acrylic plastic viewports to the pressure hull:
Flat circular discs, truncated cones and wrap-
around windows such as in Martine’s SUB-
MANAUT. Considerable testing and evalua-
tion of the first two forms (Fig. 5.14 & 5.15)
have been conducted on acrylic viewports at
the U.S. Naval Civil Engineering Laboratory
(25, 26). No studies are reported for the char-
acteristics of the wrap-around variety.

Flat Viewports: The results of the NCEL
studies show that the windows should be
sealed in a flange cavity by means of a
radially compressed ‘“O” ring contained in a
circumferential groove midway between the
viewport’s parallel faces. The viewport may
bear directly on the steel seat or on a 2/s2-
inch-thick neoprene gasket. If no gasket is
used, a liberal coating of silicone grease ap-
plied to the flange may suffice. To hold the
viewport a retaining ring resting on a !/a-
inch rubber gasket of 60- to 100-durometer
hardness is recommended. The viewport
should have a maximum diameter to minor
opening ratio of 1.5 and a radial clearance of
0.005 inch or less between viewport edge and
flange cavity (Fig. 5.14). Reference (25) rec-
ommends that a safety factor of 4 be used at

RETAINING
RING

INSERT

Fig. 5.14 Flat acrylic plastic viewport.

260

these conditions. It is impractical to con-
struct the viewport flange or its housing out
of the hull itself. For this reason, an insert is
separately machined, then forged to the de-
sired tapered thickness and subsequently
welded into the hull with the insert in place.
The inserts are also required to be of mate-
rial similar to that of the hull.

Conical Viewports: From its first inception,
the 90 degree conical acrylic plastic viewport

RETAINING
RING

of Professor Piccard has been the mainstay
of deep submersibles. The only reported inci-
dent of failure was aboard ASHERAH when
it struck an underwater object and cracked
its viewport; however, no flooding resulted.
Exhaustive testing (26) of plastic viewports
of various thicknesses and angles produced
sufficient knowledge to recommend dimen-
sional constraints and viewport seal design.
Figure 5.15 presents typical sealing on past

GASKET
VIEWPORT
HULL

(a) Lapped-Joint Seal.

(b) Gasket Seal.

"/wm

(c) O-Ring Seal No. 1

(d) O-ring Seal No. 2.

Fig. 5.15 Current conical viewport seal designs. [From Ref. (26) ]

261

and present submersibles; Figure 5.16 pre-
sents a design recommended for habitats as
well as for submersibles where long-term
creep loading introduces more stringent re-
quirements.

All the current and proposed designs call
for a retaining ring and either an “O” ring or
gasket for low pressure seals. The high pres-
sure seal is effected by making a lapped-joint
seal between the viewport and insert. An 80-
to 90-percent contact is achieved by surface
finishing in the 8- to 32-rms range. Snoey
and Katona (26) provide a step-by-step deri-
vation of the formulas and curves related to
conical viewport design and include test pro-
cedures which preceded these data.

Piping:

Submersible piping systems serve several
functions:

Ballasting: Carrying compressed air from
storage to ballast tanks for blowing.

Trim: Transporting trim fluids fore or aft
to their respective reservoirs.

Hydraulics: Transporting fluid to activate
a device such as a manipulator or weight
dropper.

Breathing Gasses: Supplying air or mixed
gas from external reservoirs into the pres-
sure hull or within the pressure hull itself.

O-RING SEAL NO. 3

O-RING — PARKER 2 — 457, N-183-9
NITRILE (BUNA N)
90 DUROMETER

Four types of materials have been used to
perform these functions: Cupro-nickel, mo-
nel, stainless steel and flexible wire-braided
plastic hose.

Cupro-nickel (7030) is a universally ac-
cepted piping material for the transfer of
salt water. It is very corrosion resistant but
costly.

Monel has the same advantages as cupro-
nickel and has been used primarily for oxy-
gen systems. Its disadvantages are not only
cost, it is difficult to obtain by virtue of its
wide use and demand in military subma-
rines. Strangely, according to Purcell and
Kriedt (27), it is not clear why monel is the
preferred material for oxygen systems in
U.S. military submarines; indeed, after a
thorough investigation into the advantages
and disadvantages of other materials, they
conclude that other materials would serve as
well.

Stainless steel piping finds wide applica-
tion in submersibles of the private sector.
Though not as corrosion resistant as cupro-
nickel and monel, it is far less expensive and
easily obtained. Standard aircraft 3/s-inch
stainless steel is the most commonly used
variety.

———-

14.189 5) am.

14,240

NOTE — AFTER MACHINING, ANNEAL AT
175°F FOR 22 HOURS; COOL AT
5°F PER HOUR

Fig. 5.16 Recommended viewport seal design. [From Ref. (26) ]

262

Under conditions where the piping will
serve vibrating or rotating devices, such as
manipulators, flexible hosing is sometimes
used to transport the hydraulic fluid. Several
varieties of wire-braided plastic hosing are
available to serve this function.

EXTERNAL STRUCTURES

External to the pressure hull are two ma-
jor structural components: 1) An exostruc-
ture consisting of a supporting framework to
carry the pressure hull and operational de-
vices; and 2) a fairing enclosing the exostruc-
ture and, in some cases, streamlining the hull to
reduce both hydrodynamic drag and the po-
tential for fouling with underwater objects.

EXOSTRUCTURE

Penzias and Goodman (28) aptly describe a

submersible’s exostructure as ‘. . . the
framework on which everything else hangs;
the pressure hull being merely one of the
‘cargo units’ suspended within or beneath
it.” The exostructure of DEEPSTAR 4000 in
Figure 5.17 demonstrates their analogy.

In several of the large, cylindrical vehicles,
e.g., ALUMINAUT, BEN FRANKLIN, AU-
GUSTE PICCARD, much of the equipment
that would be external to a smaller spherical
pressure-hulled vehicle is carried inside be-
cause of the availability of greater interior
volume. Consequently the need for an exo-
structure is limited to propulsion mountings,
rudders, diving planes and control sensors
such as sonar and echo sounders. The major-
ity of spherically hulled submersibles, how-
ever, require an exostructure.

Having decided on the shape, penetrations
and materials for the pressure hull, design of
the exostructure should be completed prior

Fig. 5.17 The exostructure of DEEPSTAR 4000. (Westinghouse Corp.)

to final stress relief of the hull. As explained
above, if the exostructure is to be bolted to
the hull, which many are (Fig. 5.17), the
attachment points should be welded on be-
fore final stress relieving in order that no
residual stresses remain in the welds or
heat-affected zones. If the exostructure is to
be strapped to the hull, e.g., SDL-1, then
such precautions are unnecessary.

Design of the exostructure is preceded by a
great deal of research into the vehicle’s pro-
jected components and subsystems; essen-
tially, the submersible is virtually ‘‘sized”
(see Chap. 6) by the time the exostructure is

designed. Figure 5.18 provides an idea of the
complexity involved in packaging the variety
of necessary equipment. Some of the consid-
erations that must be resolved before final
design are as follows:

1) Location of objects as they affect trim,
buoyancy and their own ability to per-
form.

2) Volume of objects: Are they compatible
with the dimensional constraints of the
vehicle?

3) Weight of objects both in air and in
water.

Fig. 5.18 Stern view of DEEPSTAR 4000 showing “packing” of the exostructure. (NAVOCEANO)

4

wm

Displacement of objects as they affect
buoyancy.

Non-interference with hookup points if
the vehicle is to be launched/retrieved.
Strength of the exostructure. Clearly,
the fully encumbered exostructure must
be able to withstand the anticipated
rigors of shock loading both at sea and
during transport.

Accessibility of components which may
require routine removal and servicing
without completely disassembling the
framework.

Shape of the exostructure—that it pro-
vides a framework compatible with the
final desired vehicle configuration.
Method of attachment to the pressure
hull must be such that no concentrated
or restraining loads exist.

5

wm

(or)
SS

7

—_,

8)

9

~

When such questions are resolved, the se-
lection of a material remains. In this case it
is critical to ascertain the likelihood of corro-
sion because of contact of dissimilar metals
at the point of exostructure-to-pressure hull
attachment, and where bolts or nuts of dis-
similar metals may be used to join the exo-
structure together. Finally, the material se-
lected must be lightweight in order to main-
tain a favorable W/D ratio and must lend
itself to easy fabrication and assembly. Alu-
minum is a prime candidate because of its
low density. However, some aluminum alloys
are susceptible to crevice corrosion. The dan-
ger of galvanic corrosion requires that alu-
minum must be insulated from steel compo-
nents. Both steel and aluminum are used in
present submersibles because of their availa-
bility, ease of fabrication, maintenance, long
useful life and cost.

While all submersible pressure hulls, as far
as is known, are securely and quasi-perma-
nently affixed to their exostructures, there
are exceptions. In the case of ALVIN, SEA
CLIFF and TURTLE, the pressure hulls are
attached to their exostructures by one steel
shaft which penetrates the bottom of the
pressure hull and affixes to the framework.
In the event of an emergency, such as foul-
ing or loss of positive buoyancy systems, the
thru-hull shaft may be manually rotated
from within the hull to activate a cam and
release the pressure sphere and sail from the
main body. Being positively buoyant, the

265

sphere is capable of ascending to the surface.
Electrical connections are the quick discon-
nect variety which break away as the sphere
ascends.

FAIRINGS

The fairings of submersibles serve three
purposes: 1) Reduce hydrodynamic drag; 2)
minimize the potential for fouling with sub-
merged ropes, cables or other objects and 3)
allow the vehicle’s hatch to be opened on the
surface without swamping. On the other
hand, three opposing arguments may be ad-
vanced against fairings: 1) Submersibles op-
erate at such low speeds that reduction of
hydrodynamic drag is unnecessary; 2) if the
submersible offers sufficient visibility, such
as an acrylic plastic hull, the operator can
see all potential hazards and avoid them;
and 3) opening the hatch before the vehicle is
safely aboard its support ship is inherently
dangerous and should be avoided. The count-
ering arguments are quite valid and would
suffice but for one obstacle: There is nothing
predictable about diving or the ocean. Chap-
ter 14 deals with the fatal and near-fatal
hazards experienced to date, and it would
suffice here to present two incidents to show
the danger of not having fairings: 1) On 17
June 1973, the acrylic plastic-hulled JOHN-
SON SEA LINK became entangled in the
debris of a scuttled destroyer at 360 feet off
Key West, Florida. The unfaired SEA LINK
was held 31 hours until pulled free of its
restraint. Two men in the aft aluminum
pressure cylinder perished as a result. 2)
Diving in the Gulf Stream, the submersible
DEEPSTAR 4000 became separated from its
support ship SEARCH TIDE while sub-
merged. Upon surfacing, neither the ship’s
radar nor radio direction finder could locate
the submersible. As a final resort, a trunk
surrounding the hatch was inflated and the
hatch opened, thereupon allowing the opera-
tor to fire off flares which were seen by the
surface ship and allowed recovery. No per-
sonnel perished.

It is debatable that reduction of hydrody-
namic drag is necessary. If the vehicle is
towed, however, some protection against
drag and wave slap must be provided for its
cables and external instruments. There is no
question of the need to reduce fouling poten-

tial (Fig. 5.19), or to be able to open the hatch
on the surface.

The most used fairing material is fiber-
glass molded and cut to the desired shape,
and bolted or screwed to the exostructure.
An aluminum alloy, Alcad 5088, constitutes
ALUMINAUT?’s fairing, while plain sheet
metal serves the purpose on small, privately
owned submersibles of the SEA OTTER vari-
ety. Though fiberglass offers a wider variety
of advantages than metal, e.g., non-corro-
sive, greater formability, the process of de-
signing and fabricating a mold is costly, and,
for one-of-a-kind vehicles, may be excessively
expensive where sheet metal serves almost
as well. In vehicles where an echo sounder
transducer is located within the fairing, it is
necessary to cut out the fiberglass portion
the transducer will insonify and install a
rubber-based section to serve as an “acoustic
window.”

The overall design of the fairing is an
individual matter. Obviously it must be so
configured as to permit the submersible to be

4 ie ae
st: te Dk 3 ches

handled, especially during launch and re-
trieval. It should also permit easy removal
for access to external components. For exam-
ple, DEEPSTAR 4000's fairing (Fig. 5.20a) is
attached in sections sufficiently small to al-
low hand-removal and access to any compo-
nent. On the other hand, the fairing on the
Navy’s DSRV (Fig. 5.20b) may be removed,
but requires a lifting device which may be
quite difficult to manage in high seas.

PRESSURE TESTING

When the pressure hull is completed, and
thru-hull penetrators are in place or
blanked, it is customary to subject the struc-
ture to pressure tests. For submersibles of
the BEN FRANKLIN variety, there are no
options on the choice of test tanks; only the
ocean is sufficiently large. Hence, pressure
testing of the hull must be deferred until the
vehicle is in actual service. For smaller vehi-
cles, e.g., up to ALVIN-size, there are several
test facilities throughout the country where

Fig. 5.19 STAR Ill approaching an underwater structure off Nassau, Bahamas. (Gen. Dyn. Corp.)

266

267

TABLE 5.6 U.S. PRESSURE TANK FACILITIES GREATER
THAN FIVE FEET DIAMETER [FROM REF. (28)]

Static Cyclic
Internal Length Pressure Pressure Pressure Temp.
Diam. (ft) (ft) (psi) (psi) Medium Control
ee aa ee
Boston Naval Shipyard 5.0 5.0 1,500 None Fw/sw! None
Boston, Mass 8.0 5.0 500 None FW/SW None
Elec. Boat Div., Gen. Dynamics
Groton, Conn. 7.5 14.75 1,000 None FW None
Mare Island Naval Shipyard 6.0 12.0 1,000 None FW/SW None
Vallejo, Calif. 9.0 10.0 550 None FW/SW None
Naval Civil Engineering Lab.
Port Hueneme, Calif. 2.0 15.0 3,500 0-2,750 FW/SW None
Naval Mine Engineering Facility
Yorktown, Pa. 7.0 13.0 600 None FW None
Naval Ordnance Lab. 0-1,250
White Oak, Md. 8.33 36.5 1,250 0.2 CPH FW None
Naval Research Lab. 0-1,000
Orlando, Fla. 8.3 26.0 1,000 10 CPH FW 12-40°F
Naval Ship Research & Devl. ctr.2 5.0 9.0 20,000 0-10,000 FW/Oil None
Carderock, Md. 1 CPM
10 (sphere) 10,000 0-10,000 Oil/FW/SW 37-70°F
0.5 CPM
6.0 21.0 6,000 0-5,600 Oil/FW/SW None
1CPM
11.5 30.0 1,000 0-1,000 Oil/FW/SW None
1 CPM
Naval Ship Research & Devl. Ctr.
Annapolis, Md. 10.0 27.0 12,000 0-4,000 SW/FW 30-100°F
Naval Undersea Res. & Devi. Ctr.
San Diego, Calif. 5.0 10.0 10,000 None FW/SW 28-75°F
Newport News Shipbuilding & Drydock Co.
Newport News, Va. 5.0 23.0 1,000 None FW/SW None
Ordnance Research Lab. 0-16,000
University Park, Pa. 5.0 13.75 16,000 1/8 CPH FW None
Perry Submarine Builders
Riviera Beach, Fla. 8.0 29.0 1,300 None FW None
Portsmouth Naval Shipyard 30.0 75.0 600 0-600 SW None
Portsmouth, N.H. 1CPM
8.0 14.0 600 None FW/SW None
Puget Sound Naval Shipyard
Bremerton, Wash. 6.0 12.0 1,500 None FW None
Southwest Research Institute 75 19.17 4,000 0-2,000 FW/SW/Oil None
San Antonio, Texas 7.58 (sphere) 1,200 0-1,200 FW/SW 32-85°F

Tew = § resh water; SW = Seawater
aN tanks to be replaced by one 13.0-ft-diam., 40-ft-long, 3,000-psi tank.

268

the entire vehicle can be accommodated (see
Table 5.6).

Historically, pressure testing programs
proceeded along lines which started from
unmanned, tethered or untethered dives and
grew progressively deeper to the vehicle’s
maximum operating depth and to some point
beyond (test depth). Beebe’s BATHY-
SPHERE was lowered on a cable; Auguste
Piccard’s FNRS-2 was equipped with a depth
gage that dropped ballast at a pre-set depth,
and a timer that performed the same task if
the depth gage failed to function. In the
event that FNRS-2 drifted into shallow
water, an antenna-like object was affixed to

strike the bottom first and dump ballast
before the vehicle struck the bottom. In both
BATHYSPHERE and FNRS-2, the ability of
the pressure hull to withstand the deep pres-
sures was observed merely by the presence
or absence of seawater inside the sphere.
When large vehicles of the ALUMINAUT
variety appeared, pressure tests began with
the finished vehicle making progressively
deeper, manned dives and conducting strain
gage readings on each dive. ALVIN, on the
other hand, was sent down initially un-
manned to 7,500 feet on a tether before
manned dives to 6,000 feet were conducted.
Vehicles of the PAULO I variety (Fig. 5.21)

Fig. 5.21 PAULO | (now SEA OTTER) entering a test tank for pressure testing. (Anautics Inc.)

are amenable, by virtue of their small size, to
options other than the deep sea. Test tanks
offer the advantage of being far less expen-
sive and troublesome than open-ocean test-
ing; pressures can be better controlled, and
the test can be monitored more precisely. A
great advantage lies in the fact that the
pressure hull alone may be tested prior to
completion of the entire vehicle. Invariably,
when the vehicle must be tested as an oper-
ating unit, failure of operational compo-
nents, such as motors, depth gages, sonars,
etc., or inclement weather, results in delayed
test programs. In a test tank the vehicle may
be tested component-by-component, then as-
sembled and tested in its entirety. In the
event of hull failure, an obvious advantage
with such testing is that no personnel are
required in the vehicle. Another advantage
resides in the speed with which the pressure
may be relieved or the tank emptied of

water. If, for example, an electrical penetra-
tor failed and water began entering the hull,
the test tank could be emptied in a few
minutes.

While unmanned open-sea tests on a tether
may be as conclusive as tank tests, they
include the risk that the object being tested
may be lost. As previously noted, both SP-
350 and SP-3000 pressure hulls were lost
when the tethers gave way.

PRESSURE TEST FACILITIES
According to reference (29), at least 23 test
tanks in the U.S. are sufficiently large to
accommodate submersible pressure hulls of
5-ft diameter and greater (Table 5.6). With
the advent of the Ocean Pressure Labora-
tory at the Annapolis, Maryland-based Na-
val Ship Research and Development Center,
whole vehicles such as DEEPSTAR 2000
(and larger) may be tested in their entirety.

ene mn

Fig. 5.22 (a) DEEPSTAR 2000 prepares to enter the U.S. Naval Ship Research and Development Center's 12,000 psi pressure tank. (U.S. Navy)

270

Such installations provide thru-chamber con-
nections from the test specimen to data mon-
itoring equipment on the outside. Tempera-
tures may be lowered to those values antici-
pated within the vehicle’s diving range and
scope of operations, and some, though not all,
can use seawater as the pressurizing me-
dium.

Other pressure testing facilities are availa-
ble at private industry and academic institu-
tions, but the only two reportedly used to
date for submersible hulls are those of the
Southwest Research Institute and Perry
Submarine Builders (Fig. 5.22). Constructed
primarily for government test programs,
Navy test facilities may be used by private
industry at a cost dependent on time and
effort required, and on a not-to-interfere ba-
sis.

PRESSURE HULL
MEASUREMENTS AND TESTS

The variety and quantity of pressure hull
tests are quite numerous. Accompanying
such tests is the need for documentation and
recording the results. Although it is not a
legal requirement, most private American
submersible owners strive to attain classifi-
cation by the American Bureau of Shipping.
Naval submersibles have quite stringent cer-
tification requirements of their own. Hence,
the certifying or classifying authorities must
have written documentation of the tests and
their results. Prior to 1968, the submersible
builder had few if any guidelines to follow
regarding tests and documentation. In 1968
the Marine Technology Society published
Safety and Operational Guidelines for Un-
dersea Vehicles (3) which outlines in detail

Fig. 5.22 (b) A Perry-built pressure hull entering their test tank. (Perry Submarine Builders)

the many tests and documenting procedures
their Undersea Vehicle Safety Standards
Committee feels are necessary to assure a
safe submersible.

An indication of the myriad tests followed
in submersible construction can be attained
from the fabrication steps and tests for AL-
VIN’s pressure hull in Table 5.7. At the con-
clusion of the tests shown in this table, the
pressure hull was considered a part of the
vehicle system and tested as such.

In the course of the pressure test (step 12
of Table 5.7) on ALVIN’s hull, strain gages
were employed, but another technique is
used by Perry Submarine Builders which
follows a volumetric change in the hull. Both
techniques will be briefly discussed.

Strain Gage Measurements

As outlined previously, many known dis-
continuities are built into the submersible
hull, e.g., hatches, viewports, electrical pene-

trations, welds, etc. Such discontinuities are
calculable. To a great degree, verifying the
analytical stresses calculated at these dis-
continuities is measured by strain gages.
Strain gages consist basically of finely-
wound wire (the most modern and sensitive
employ printed circuit techniques) attached
to the hull where changes in their electrical
resistance are measured as pressure strains
the hull. The resistance change in the gage is
subsequently translated to a change in wire
length measured in microinches. The final
results are then compared with the calcu-
lated results to assure that the latter were
not exceeded. Placement of the gages is ex-
tremely critical to assure that the tests are
valid, and all likely stress areas are meas-
ured.

In general, the pressure hull is pressurized
externally by some medium (seawater, fresh
water) to a proof test pressure (a value calcu-
lated in the early stages of design and is

TABLE 5.7 FABRICATION AND TEST STEPS FOR ALVIN'S PRESSURE HULL [FROM REF. (30)]

Step

1. Ingot melt

2. Roll into slab and flame cut

3. Spin into hemisphere

4. Machine internally and mating surface
5. Weld to form sphere

6. Machine externally

7. Cut insert openings

8. Weld inserts into hull

9. Clean welds, add hatch, viewports, etc.

10. ‘Paint to prevent corrosion
11. Prepare for pressure test
12. Pressure test

13. Rework and repaint

14. Mount into exostructure

Inspection and Test
Visual, chemical
Visual, ultrasonic
Visual, ultrasonic, temperature
Dimensional
X-Ray, ultrasonic
Visual, dimensional
Dimensional
Visual, X-Ray, ultrasonic Cogg
Dimensional
Visual
Visual, dimensional
Visual monitoring of instrumentation
Visual

Visual, dimensional fit

TEETER

272

from 1.1 to 1.125 of the vehicle’s maximum
operating depth). Because the submersible
will be subjected to cyclic pressures, a model
of it may be subject to cyclic testing where
the external pressure in the test chamber
usually is held constant, and the pressure is
varied within the vehicle’s hull. This avoids
cycling the test chamber. In submersibles

STRAIN GAGE LOCATIONS

too large for test chambers strain gages are
utilized and read by the occupants during
dives. In some cases a few gages may be left
on at critical positions and monitored period-
ically during the vehicle’s operations. An
example of a strain gage reading and its
location is provided in Figure 5.238 from
DSRV-2 tests (37).

co ©

se) o

N N

237 235
137

eo)

o

SYMBOLS ON PLOTS:

@ POINTS OF INCREASING
PRESSURE

Oo POINTS OF RETURN TO
ZERO PRESSURE

HYDROSTATIC PRESSURE — PSI

EQUIV.

5,000-FT.
DEPTH IN
SEAWATER

200

400 600 800 1000 1200 1400 1600
STRAIN wIN./IN.(+)

Fig. 5.23 Strain gage readings and location on viewport of DSRV-2.

273

Volumetric Measurements

An approach has been taken by Perry Sub-
marine Builders adopted from the Com-
pressed Gas Association which tests gas stor-
age vessels throughout the United States, as
well as other internally pressurized systems
such as pipelines. In this procedure (31) the
pressure hull is filled with water, each com-

VOLUME CHANGE

“S— INITIAL TAKE-UP

PRESSURE
HULL

PROPORTIONAL
LIMIT

OPERATIONAL PRESSURE

PRESSURE INCREASING

partment is sealed pressure tight, and the
hull is placed in a pressure tank (Fig. 5.24)
which is then flooded and pressurized. Each
vehicle compartment contains an efflux line
leading through the test tank to a bank of
graduated cylinders called volumeters. Small
preliminary pressure is applied to force out
pockets of air and shake down the system.

VOLUMETER

TEST TANK

INELASTIC REGION

ELASTIC REGION

Fig. 5.24 Chart showing pressure-volume change during hydrostatic tank test. (From Perry Submarine Builders)

274

The pressure is then built up incrementally
while the change in volume in the volume-
ters is recorded. At a pressure point where
critical behavior is predicted, the pressure
increments are decreased and the test pro-
ceeds very slowly while watching for the first
sign of a non-linear volume change. When
this occurs it is taken to be the onset of a
transition from elastic to plastic yield in the
hull structure. In the initial development of
this technique, strain gages are attached to
compare the test results, and to assist in
locating the local effects which caused test
termination. Without the assistance of strain
gages, it would be virtually impossible to tell
precisely where the critical stress occurred.

For larger vehicles some measure of the
pressure hull behavior is attained through
model testing. In this procedure a scale
model is constructed in the same fashion and
of the same materials as the hull; the model
is then subjected to pressure testing in a
tank as if it were the full scale hull. Such
scale models are occasionally tested to fail-
ure as a means of verifying calculations.

Pressure tanks themselves can be ex-
tremely complex, sensitive and potentially
dangerous. Mavor (32) reported a tank fail-
ure at 4,300 psi, with one of ALVIN’s hulls
inside, which blew off a hatch but left the
windows undamaged and tight.

Endo and Yamaguchi (33) present an excel-
lent description of pressure and materials
testing facilities at Mitsubishi Heavy Indus-
tries. The paper is not only a good summari-
zation of the devices available, but includes
requirements for deep submergence mate-
rials as well.

CORROSION AND ITS
CONTROL

As will become evident in later sections, a
great quantity of dissimilar metals are
joined and juxtaposed within the exostruc-
ture and the pressure hull. Corrosion protec-
tion and control is another concern of past
and present submersible builders.

Corrosion control on submersibles which
are routinely launched/retrieved for each
dive is somewhat less complicated than those
continuously in the water—mainly because
vehicles removed from the sea may be

275

washed with fresh water and will dry. On the
other hand, availability of components and
cost result in a situation where less than
optimum corrosion resistance and galvani-
cally incompatible materials must be used.
Likewise, cathodic protection as a general
method often is impractical and difficult ow-
ing to the geometrical complexity of compo-
nents. Though procedures for corrosion con-
trol vary from vehicle-to-vehicle, certain
problems are common to all. Consequently,
the procedures followed in the DEEPSTAR
submersibles fairly well represent a number
of common problems and solutions. Symonds
and Woodland (34) present the steps taken to
prevent corrosion on DEEPSTAR 20000
based on 4 years of operational experience
with DEEPSTAR 4000. These are summa-
rized below.

Four areas of potential corrosion were rec-
ognized on the DS-20000: General corrosion,
galvanic corrosion, crevice corrosion and
stress corrosion.

General Corrosion

Two protective measures were foreseen to
prevent general corrosion: Painting and
cathodic protection.

Painting:

According to DS-20000’s specifications al-
most all metallic vehicle components would
be painted by a polyurethane paint system
known as Magna Laminar X-500. On the
pressure sphere, four layers are applied:
Wash primer, primer, primer surface and a
finish coat. On other components the primer-
surface layer is omitted. Where viewports,
hatch and electrical penetrators join the
hull, two priming layers of the Magna Lami-
nar X-500 are applied and, subsequently, sili-
cone grease is applied during assembly.

Cathodic Protection:

A comprehensive cathodic protection sys-
tem would be impractical owing to the com-
plex geometry which requires placement of a
large number of anodes at the sacrifice of
weight and space. Because of coating defects,
zine anodes in the form of flexible steel-cored
line known as Diamond Line was proposed
because its flexibility permits adaptation to
a number of complex geometrical situations.
Lengths of Diamond Line would be attached

to the four exostructure mounting lugs and
at the hatch hinge mounting.

Galvanic Corrosion

To prevent corrosion caused by the electro-
chemical reaction between two dissimilar
metals in electrical contact with one another,
a great deal of effort was made to minimize
the area of exposed surfaces by painting
them. To prevent galvanic attack on the
pressure hull, electrical insulation between
it and adjacent titanium alloy structural
members was provided in the design. Small
lead weights (dropped individually to attain
positive buoyancy) are held by steel hooks
cast in the top of each weight. To prevent
galvanic attack between hook and weight, a
plastic sleeve covers each hook.

Crevice Corrosion

To minimize crevice corrosion, non-drain-
ing crevices are kept to a minimum and a
thorough fresh water wash down after each
dive is specified. Protection of areas impossi-
ble to wash is called for as follows: a) Be-
cause contact between fairing and metallic
exostructure members would be too snug to
permit washing, such members would be fab-
ricated from a titanium alloy (Ti-6%, Al-4%
V) which is immune from corrosion under
such conditions. b) The O-ring groove in an
aluminum propulsion controller housing
forms a perfect crevice in a corrosion-suscep-
tible material. Hard coat anodizing and scal-
ing of the aluminum and a coating of silicone
grease is specified, based on experience with
DEEPSTAR 4000.

Stress Corrosion

Components of DEEPSTAR 20000 which
could be stressed under tension were de-
signed so that failure would not occur from
stress corrosion crack propagation or corro-
sion fatigue. Fracture mechanics methods
were applied to safeguard against such envi-
ronmental effects. Fracture mechanics anal-
ysis determines if stress corrosion will occur
at flaws, e.g., welds, and if such flaws will
grow under cyclic loading to a point where
stress corrosion will occur. The method
works in the following manner: A defect of a
particular maximum size is assumed in the
component (the limitation of this maximum
size is attained from non-destructive testing

276

of the component) and if, through cyclic load-
ing, this defect will grow to a size where
stress corrosion can occur, then the compo-
nent is unacceptable. DEEPSTAR 20000’s
variable ballast tanks are composed of tita-
nium (in which crack propagation can pro-
ceed at rates of inches/hour), and fracture
mechanics showed that 4,000 cycles of load-
ing were required before cracks would grow
to a critical depth at which stress corrosion
would occur. Similar calculations were made
on the pressure hull weldments; they, too,
show acceptable limits.

The corrosion control program on DEEP-
STAR 20000 was based primarily on the fact
that the vehicle would be taken out of the
water following each dive, thus permitting
easy field maintenance and repair to chipped
paint (the first line of defense against corro-
sion), etc. Components considered most sus-
ceptible to corrosion, and least protectable
were designed for easy removal, and spares
would be carried for replacement. Such was
the case with the cast aluminum alloy pro-
peller blades.

Protective painting, a thorough fresh
water washdown, inspection and an onboard
inventory of replacement parts constitute
the major corrosion control program in sub-
mersibles today.

In large, complex vehicles where all compo-
nents are not situated for easy routine main-
tenance and repair, considerable effort must
be expended to combat corrosion. Rynewicz
(35) outlines the corrosion control methods in
the DSRV and the results of test programs
leading to these methods. A number of these
methods were gained from operating experi-
ence (45 dives) with DEEP QUEST.

For a thorough and rigorous treatment of
the entire scope of materials for ocean engi-
neering, the reader is referred to the work of
Koichi Masubuchi (36) who has left no stone
unturned in treating materials, fabrication,
selection, testing and protection of pressure
hulls and associated structures.

REFERENCES

1. Shankman, A. D. 1968 Materials for
pressure hulls—present and future. Na-
val Eng. Jour., v. 80, n. 6, p. 972-979.

2. Link, M. C. 1973 Windows In The Sea.
Smithsonian Inst., Wash., D.C.

10.

iil,

2.

13.

14.

. Lindberg, R. I.

sotachiw, J. D-

1968 ALUMINAUT—
Three years later. Amer. Soc. for Testing
and Materials, Sp. Tech. Pub. 445, p. 88—
92:

. Bernstein, H. 1965 Materials for deep

submergence in ocean science and
ocean engineering. Trans. Mar. Tech.
Soc., 14-17 June 1965, Wash., D.C., v. 1.

. Stachiw, J. D. 1971 Window In The Sea.

Smithsonian Institution Press, Wash.,
DC 31 pp:

. Ottsen, H. 1970 The Spherical Acrylic

Pressure Hull for Hydrospace Applica-
tion; Part II1I—Comparison of Experi-
mental and Analytical Stress Evalua-
tions for Prototype NEMO Capsule.
Tech. Note N-1094, Naval Civil Engineer-
ing Laboratory, Port Hueneme, Calif.

. Stachiw, J. D. 1970 Development of

Spherical Acrylic Plastic Pressure Hull
for Hydrospace Application. Tech. Rept.
R 676, Naval Civil Engineering Labora-
tory, Port Hueneme, Calif.

1970 The Spherical
Acrylic Pressure Hull for Hydrospace
Application; Part IV—Cyclic Fatigue of
NEMO Capsule #3. Tech. Note N-1134,
Naval Civil Engineering Laboratory,
Port Hueneme, Calif.

. Stachiw, J. D. 1971 Spherical Acrylic

Pressure Hull for Undersea Explora-
tion. Amer. Soc. of Mech. Engineers, Pa-
per 70-WA/Unt-3.

Stachiw, J. D. and Mick, K. L. 1970 The
Spherical Acrylic Pressure Hull for Hy-
drospace Application; Part II—Experi-
mental Stress Evaluation of Prototype
NEMO Capsule. Tech. Note N-1113, Na-
val Civil Engineering Laboratory, Port
Hueneme, Calif.

Kiernan, T. J. and Krenske, M. A. 1968
Future pressure hulls for deep submer-
gence. SPE Jour., v. 24, n. 12, p. 56-62.
Gross, J. 1969 Hydrospace steels. Sci. &
Meche. Josip. 4 ile

Ballinger, J. M. and Garland, C. (no date)
Some R & D Considerations for Sub-
mersible Materials. Sun Shipbuilding
and Dry Dock Co., Rept., Chester, Pa.
Stachiw, J. D. 1968 Plywood hulls for
underwater vehicles. Undersea Tech.,
Sept., p. 44-45.

277

15.

16.

W/E

18.

I),

20.

22.

23.

24.

25.

2ill.

Stachiw, J. D. 1967 Concrete pressure
hulls for ocean floor installations. Jour.
Oen. Tech., v. 1, p. 19-28.

Opsahl, R. and Terrana, D. B. 1967 How
the PX-15 hull was constructed. Ocn.
Ind., Oct.

Covey, C. W. 1964 ALUMINAUT. Under-
seawhechs Sept-, Delb=20-

Rockwell, P. K., Elliott, R. E. and Snoey,
M. R. 1971 NEMO A New Concept in
Submersibles. Naval Civil Engineering
Laboratory, Tech. Rept. R. 749, 68 pp.
Forman, W. R. 1969 Submersibles with
transparent structural hulls. Astronau-
tics & Aeronautics, Apr., p. 38-43.
Bynum, D. J. and DeHart, R. C. 1963
Experimental Stress Analysis of a Model
of the ALVIN Hull. Southwest Res. Inst.
Rept.

. DeHart, R. C. 1969 External-pressure

structures. Handbook of Ocean and Un-
derwater Engineering. McGraw-Hill
Book Co., New York, p. 9.1-9.20.

Snoey, M. R. and Stachiw, J. D. 1968
Windows and transparent hulls for man
in hydrospace. Mar. Tech. Soc. Trans.,
4th Ann. Conf. Exhibit, 8-10 July, p. 419-
463.

Lankes, L. R. 1970 Viewing Systems for
Submersibles. Optical Spectra, May, p.
62-67.

Edgerton, H. E. 1967 The instruments of
deep-sea photography. Deep-Sea Photog-
raphy, The Johns Hopkins Press, Balti-
more, Md., p. 47-54.

Dunn, G. M. and Stachiw, J. D. 1966
Acrylic windows for underwater struc-
tures. Photo-Optics Seminar at Santa
Barbara, Calif., Oct. 11, Soc. of Photo-
Optical Instrumentation Engineers.

. Snoey, M. R. and Katona, M. G. 1970

Structural Design of Conical Acrylic
Viewports. Naval Civil Engineering Lab-
oratory Tech. Rept. R. 686, 57 pp.

Purcell, J. and Kriedt, F. 1969 Oxygen
systems monel vs. stainless steel. Paper
presented at the 6th Ann. Tech. Sym. of
the Assoc. of Senior Engineers, Naval
Ship Systems Command, Wash., D.C.

. Penzias, W. and Goodman, M. W. 1973

Man Beneath the Sea. Wiley and Son,
Inc., New York, 831 pp.

30.

31.

33.

. Allnutt, R. B. 1972 Deep Sea Simulation

Facilities. Naval Ship Research & Devel-
opment Center, Bethesda, Md., Rept.
3825 (unpub. manuscript).

Marine Technology Society 1968 Safety
and Operational Guidelines for Under-
sea Vehicles. Mar. Tech. Soc., Wash., D.C.
Crawford, B. 1971 A volumetric tech-
nique for evaluating pressure vessels.

Mar. Tech. Soc. Jour., v. 5, n. 5, p. 7-13.

2. Mavor, J. W., Jr. 1966 Observation win-

dows of the deep submersible ALVIN.
Jour. Oen. Tech., v. 1, n. 1, p. 2-16.

Endo, M. and Yamaguchi, T. 1972 Testing
facilities for research and of deep sub-
mergence vessels. Reprints The 2nd In-
ternational Oecn. Dev. Conf., Tokyo, v. 1,
p. 870-894.

278

34.

35.

36.

37.

Symonds, J. and Woodland, B. T. 1970
Corrosion protection on DEEPSTAR
submersibles. Reprints of the 6th Ann.
Conf. and Expo., Mar. Tech. Soc., June
29-July 1, Wash., D.C., v. 2, p. 1233-1245.

Rynewicz, J. F. 1970 Corrosion control
for the DEEP SUBMERGENCE RESCUE
VEHICLE. Reprints of the 6th Ann. Conf.
and Expo., Mar. Tech. Soc., June 29-July
1, Wash., D.C., v. 2, p. 1247-1263.

Masubuchi, K. 1970 Materials for Ocean
Engineering. M.1.T. Press, Cambridge,
Mass., 496 pp., 1 Appendix.

Senos, J. J. 1971 1/2 Scale Model Test of
DSRV Pressure Hull. Naval Ship Re-
search & Development Center Rept. No.
352B, Jan.

BALLASTING AND TRIM SYSTEMS

In addition to descending to the bottom,
ascending to the surface and running hither
and yon, submersibles must make small ad-
justments in buoyancy and trim when sub-
merged. Such changes serve the following
purposes: To follow a sloping bottom, to han-
dle additional weight in the form of water or
biological/geological samples, and to surface
with sufficient freeboard for safe transfer of
personnel and equipment. All of these func-
tions are performed by changes in the vehi-
cle’s buoyancy or trim. The approaches to
buoyancy and trim control are many, and
most are successful. In some cases trim
changes are accomplished dynamically with
the vehicle’s thrusters and dive planes. But
use of thrusters calls for electrical power

279

which is limited, and attitude changes using
dive planes require that the submersible be
underway, a condition not always compatible
with the mission.

The nature and capacity of a ballasting
system depend upon several factors, but the
total submerged displacement of the vehicle
and the desired payload assume primary im-
portance. Other considerations might include
desired reaction time of buoyancy changes
and the anticipated number of cycles such
changes may require on one dive.

WEIGHT AND VOLUME
ESTIMATES

As a first approximation, the designer may

prepare a form which groups together:
Structures: Pressure hull, exostructure, fair-
ings;

Propulsion and Electrical Plants: Propellers,
thrusters, batteries;

Communication and Control: Underwater
telephone, steering controls, radio;

Auxiliary Systems: High pressure air, ballast-
ing, life support;

Outfit and Furnishings: Hull fitting, chairs,
paint;

Crew and Instrumentation: Crew, scientific
and operational instruments, tools.

An estimate is made of the weight, dis-
placement volume and centers of gravity and
buoyancy of each item within the preceding
group. When such calculations are made, the
elements of the vehicle must be adjusted in

size and placement until two conditions are Structures 65%
TABLE 6.1 PRELIMINARY WEIGHT AND BUOYANCY ESTIMATES
Vert Ref = B.L. Long Ref = F.P. Buoyancy Vert Ref = B.L. Long Ref = F.P.
Weight VCG Moment LCG Moment (Pounds) VCB Moment LCB Moment

Description Pounds (In.) (In. - Lb) (In.) (In. - Lb) Seawater (In.) (In. - Lb) (In.) (In. - Lb)
Main Sphere (Steel) 2,590 55 142,450 58 150,220 9,210 55 506,550 58 534,180
Main Sphere (Acrylic) 2,280 55 125,400 58 132,240 9,210 55 506,550 58 534,180
L-O Sphere 1,960 61 119,560 178.5 349,860 5,870 61 358,070 178.5 1,047,795
Variable Ballast Sphere ani) GS} 17,490 =-118 38,940 640 53 33,920 118 75,520
Ballast Air Bottles 680 62 42,160 140 95,200 535 62 33,200 140 75,000
Breathing Air Bottles 680 =61 41,480 153 104,040 535 61 32,620 153 81,900
Battery Box Top 2,590 86 222,740 119 308,210 1,000 86 86,000 119 119,000
Battery Box Bottom 2,550 25 63,750 121 308,550 1,000 25 25,000 121 121,000
Prop Pods 900 60 54,000 116 104,400 130-60 7,800 116 15,080
Drop Weight 550 «113 7,150 58 31,900 50 13 650 58 2,900
Fairing 1,200 54 64,800 112 134,400 480 54 25,900 112 53,800
Framing 1,250 54 67,500 112 140,000 20 54 1,080 112 2,240
Int. Equipment (Mn Sph) 1,200 55 66,000 58 69,600 = — = - =
Int. Equipment (L-OSph.) 300 61 18,300 178.5 53,550 - - - i =
Hatches & Inserts (L - 0) 800 8632 25,600 178.5 142,800 40 32 1,280 178.5 71,400
Payload

Steel Sphere 2 OCs Sie: 108,000 89.5 2,219,670 170 51.5 8,750 89.5 15,200

Acrylic Sphere 1,450 45 65,300 100 2,220,180 120 45 5,400 100 12,000
Totals

Steel Sphere 19,680 54 1,060,980 112.5 2,219,670 19,680 57 1,120,820 112.5 2,215,015

Acrylic Sphere 19,630 54 1,060,110 112.5 2,220,180 19,630 57 1,117,470 = $112.5 2,211,815

B.L. — Base Line
F.P. — Forward Perpendicular

nearly met: 1) The sum of all weights must
be equal to the weight of the water displaced
by all buoyant volumes; and 2) the resultant
center of gravity of all weights must be
below and in a vertical line with the result-
ant center of buoyancy.

Rechnitzer and Gorman (1) treat in detail
the procedures for calculating submerged
displacement of various components and
housings used in submersibles. Final adjust-
ment to attain neutral submerged buoyancy
is made with fixed, positive (e.g., syntactic
foam) ballast or fixed negative (e.g., lead
weights) ballast either inside or outside the
pressure hull.

Vincent and Stavovy (2) present figures for
the average weight of components within the
preceding list; these are as follows:

VCG — Vertical Center of Gravity
LCG — Longitudinal Center of Gravity

2380

VCB — Vertical Center of Buoyancy
LCB — Longitudinal Center of Buoyancy

L.0. — Lock-out

Propulsion and Electrical

Plants

Communication and Control

Auxiliary Systems
Outfit and Furnishings
Crew and Instrumentation
Obviously, these percentages are generali-
ties and cannot be applied to a specific vehi-
cle. The most perplexing values to attain are
those for instruments which vary widely

Southwest Research
Institute
San Antonio, Texas

Electric Boat Division,
General Dynamics
Groton, Conn.

Reynolds Metals Co.
Sheet and Plate Works
McCook, Illinois

Ladish Company
Cudahy, Wisc.

Nordberg Manufac-
turing Co.
Milwaukee, Wisc.

13%
3%
14%
1%
4%

from one manufacturer to the next. Chapter
11 presents weight and size data for selected
scientific instrumentation and essentially re-
flects current state-of-the-art. Table 6.1 pre-
sents calculations prepared for a vehicle pro-
posed by International Hydrodynamics and
“serves as an example of the data needed for
weight, volume and buoyancy calculations.
A further example of the complexity in-
volved in building and “sizing” a submers-

TABLE 6.2 ALUMINAUT CONTRACTORS

Initial feasibility study

in 1958-1959, with
Reynolds.
Prime contractor for

design and building ves-
sel.

Cast aluminum ingots
for hull sections.

Forging and shaping of
hull sections.

Precision machining
and assembly of hull
sections.

Equipment and Service Suppliers

Acme Electric Corp.
Cuba, New York

Aero Industries, Inc.
Greenwich, Conn.

Alloy Flange &
Fitting Corp.
Brooklyn, New York

Amchien Products, Inc.
Bristol, Conn.

Bonney, Forge &
Too! Works
Allentown, Pa.

Clearfloat, Inc.
Attleboro, Mass.

Cohu Electronics, Inc.
Kintel Division
San Diego, Calif.

Cosmos Industries, Inc.
Long Island City,
New York

Electrical transformers.

Pilot's chair.

Flanges and fittings.

Special finish for alu-
minum.

Fittings.

Viewing port windows.

Miniaturized TV cam-
era and monitors.

Navigation equipment.

Curtis Manufac-

turing Co.

Bunnell Division
Cleveland, Ohio

Danko-Arlington, Inc.
Baltimore, Md.

DeLackner Helicop-
tors, Inc.
Mt. Vernon, N.Y.

Edgerton, Germes-
hausen & Grier, Inc.
Boston, Mass.

Exide Industrial Div.

Electric Storage

Battery
Philadelphia, Pa.

Feedback Controls, Inc.

Natuck, Mass.

General Electric Co.
Erie, Pa.

International
Resistance Co.
Philadelphia, Pa.

Kaar Engineering Corp.
Palo Alto, Calif.

G. W. Lisk Company

Clifton-Springs, N.Y.

Lord Manufacturing Co.

Erie, Pa.

Magna Coating &
Chemicals Corp.
Los Angeles, Calif.

Marsh & Marine
Manufacturing Co.
Houston, Texas

Michigan Wheel Co.

Grand Rapids, Mich.

Steering and diving
mechanisms and special
tools.

Castings.

Precision hull studs,
propulsion gear boxes
and emergency drop.

Underwater lights and
TV equipment.

Silver-zinc batteries.

Dead
alyzer.

reckoning an-

Propulsion and steering
motors and manipu-
lator.

Remote
systems.

indicating

Radio-telephone
munications.

com-

Ballast control sole-

noids.

Vibration and shock
isolation equipment.

Special finish for alu-
minum.

Hull penetrating con-
nectors and underwater
cable.

Propellers.

281

Modern Metals
Manufacturing Co.
New York, N.Y.

Marotta Valve Corp.
Boonton, New Jersey

Northrop Nortronics
Precision Products
Norwood, Mass.

Oceanographic
Engineering Corp.
La Jolla, Calif.

Ocean Research
Equipment, Inc.
Falmouth, Mass.

Bliss-Portland
Division of E. W.
Bliss Co.
South Portland, Me.

Sangamo Electric Co.
Springfield, Ill.

Sperry Piedmont Co.
Charlottesville, Va.

Stevens Institute
of Technology
Hoboken, New Jersey

Straza Industries
El Cajon, Calif.

Trident Engineering
Associates
Annapolis, Md.

Triton Marine Products
Port Washington,
New York

Westinghouse Electric
Undersea Division
Baltimore, Md.

Fabrication and manu-
facturing of electrical
panels and boxes.

Water ballast valves.

Speed and _ distance
Navigation equipment.

Pan and tilt control

system.

High pressure testing.

Fabrication of keel,
ballast tanks, stern and
superstructure.

Amp-hour meters.

Gyrocompass.

Hydrodynamic studies.

CTFM scanning sonar,
and underwater phone.

Engineering study of
sea support systems.

Depth sounder-receiver,
transmitter, recorder.

Bottom scanning sonar.

ible is seen in Table 6.2, taken from reference
(8), which shows the numerous subcontrac-
tors the prime contractor dealt with at var-
ious stages in development and fabrication of
ALUMINAUT.

COMPRESSED AIR AND
DEBALLASTING

The most universally applied power source
on submersibles to empty the main or varia-
ble ballast tanks of water is compressed air.
However, compressed air is useful only to
certain depths where the volume and pres-
sure required to store it is practical, and
where its density under pressure provides
effective buoyancy. In many vehicles varia-
ble ballast tanks are pumped dry; in this
case, the tanks must be able to withstand
ambient pressures. The following discusses
the application of compressed air for water
deballasting.

A discussion of compressed air is virtually
impossible without defining certain terms.
The following are taken from the U.S. Navy
Diving Manual.

Gage Pressure (psig): The difference between
the pressure being measured and the sur-
rounding atmospheric pressure. The zero on
ordinary gages indicates atmospheric pres-
sure and, except where otherwise specified,
almost all pressure readings are gage pres-
sure. When the pressure in a tank is given as
1,000 psi, this means it is 1,000 psi above
atmospheric pressure. When it is desirable to
indicate that a pressure is gage, it is custom-
ary to express it as pounds per square inch,
gage (psig). Gage pressure is a commonly
used expression in the submersible field, al-
though many manufacturers do not state
psig.

Absolute Pressure (psia): The true or total
pressure being exerted, consisting of the
gage pressure plus 1 atmosphere of pressure
(14.7). Absolute pressure is commonly
expressed as pounds per square inch, abso-
lute (psia) and this value is always used in
equations describing gas behavor.

Standard Temperature and Pressure (STP):
The volume a gas occupies at 14.7 psia and
32°F (760 mm Hg absolute; °C). Under these
conditions is derived a Standard Cubic Foot
(SCF).

282

Normal Temperature and Pressure (NTP):
The volume occupied by a gas at 14.7 psia
and 68°F. “Normal” is a relative term and
can also be taken at 70° or 72°F.

In addition to the above terms are two gas
laws which describe the behavior of air un-
der varying conditions:

Boyle’s Law states that if the temperature
is kept constant, the volume of gas will vary
inversely as the absolute pressure while the
density will vary directly as the pressure.

Charles’s Law states that if the pressure is
kept constant, the volume of a gas will vary
directly as the absolute temperature.

These two laws are combined to relate
pressure, volume and temperature in a gen-
eral gas law expressed as:

P, V; —_ P, V,
where: Ge oe Be
P, = initial pressure (absolute)

V, = initial volume

T, = initial temperature (absolute)
and

P, = final pressure (absolute)

V, = final volume

T, = final temperature (absolute)

The air supply for blowing water ballast is
earried aboard submersibles in cylindrical
containers referred to as either tanks, flasks
or bottles. These tanks may be made of an-
aluminum alloy, steel or other special mate-
rials. The capacity (generally expressed in
cubic feet) of such tanks is the amount of air
or gas the tank holds when charged to its
rated pressure. The rated pressure (also
called “service pressure” or “working pres-
sure’’) is the internal pressure to which the
tank can be repeatedly filled without causing
abnormal metal fatigue. In the U.S., the
Department of Transportation maintains
regulations for design and manufacture of
high pressure cylinders, and, if made of steel,
their pressure rating is stamped on the cylin-
der. Cylinders with pressure ratings of 1,800
to 5,000 psig are available, but 2,400 psig and
3,000 psig are most common. A 70-ft®? tank,
for example, filled to its rated 2,250 psig
would contain sufficient air to fill an enclo-
sure of 70-ft? volume at a pressure of 14.7 psi;
the actual physical volume of the tank would
be about 2 ft?.

High pressure gas (air) cylinders are gen-
erally hydrostatically tested at 1.5 or 1.66
times their rated pressure and may have a
burst pressure of 2 to 4 times the rated. A
safety release device is usually required in
these tanks.

Another safety precaution in the handling
of compressed air, or any gas, is color coding
the tank. Although submersible owners are
not required to abide by any particular cod-
ing system, and few do, both the American
Bureau of Shipping and the U.S. Naval Ma-
terial Command recommend that a color code
be followed as presented in Table 6.3.

The amount and service pressure of air
carried aboard submersibles varies consider-
ably and depends upon the depth from which
the water ballast is to be operated and the
volume of the ballast tanks.

Virtually all vehicles diving to 2,000 feet or
less use compressed air to blow main and
variable ballast. Quite frequently both a
high and low pressure system are employed:
The low pressure to blow main ballast at the
surface, and the high pressure to blow main
ballast in an emergency or the variable bal-
last tanks when submerged. For example,
BEN FRANKLIN uses a 1,422-psi low. pres-
sure system to blow main ballast on the
surface and a 2,874-psi system to blow main
ballast at 2,000 feet in an emergency.

As mentioned, the service pressure of bal-
last blow tanks varies widely from vehicle-to-
vehicle. The 150-ft depth vehicle of All Ocean
Industries carries 40 ft? of compressed air in
two diver-type scuba tanks at 2,250 psi; the
15,000-ft ALUMINAUT carries a 4,500-psi
supply of air which is used to blow water
ballast to 4,000 feet in the event of an emer-
gency.

When air is used to force water ballast out
of a tank in open communication with am-
bient seawater, its effectiveness as both a
deballasting and buoyant force is a function
of depth (pressure) and temperature. It is in
this context that air shall be considered in
the following. From Chapter 2 it was seen
that pressure increases at a rate of 14.7 psi
with every 33 feet of depth. Temperature, on
the other hand, decreased with depth at a
rate dependent upon geographic location and
time of year. To force water out of a ballast
tank into the sea with compressed air, the
air must exert a pressure exceeding that of
the surrounding water. Having removed this
water, the weight of the vehicle is now much
less and the vehicle attains a buoyant up-
ward force, but air under seawater pressure
is of greater density than air at atmospheric
pressure and this density must be taken into

account when employing an air deballasting
scheme. =

TABLE 6.3 RECOMMENDED COLOR CODING IN PIPING AND COMPRESSED GAS CYLINDERS

Designation
Gas ABS
Air (low or high pressure) ALP, AHP
Helium He
Oxygen 0
Helium-Oxygen Mix He-O0
Nitrogen N
Exhaust E
Hydrogen H

283

Color Paint
USN ABS USN
ALP, AHP Black Black
He Buff Buff
0 Green Green
He-0 Orange Buff and Green
N Light Gray Light Gray
E Silver Silver
H Yellow Brown

Examining Table 6.4, it is seen that air
under a pressure of 4,498 psia (10,000 ft) and
70°F has a density of 20.59 pef (pounds per
cubic foot), and at 2,246 psia (5,000 ft) and
70°F its density is almost half this or 11.43
pef. Seawater has an average density of 64.4
pef; air at 4,498 psia is approximately 1/3 as
dense as seawater, whereas air at 2,246 psia
is about '/6 its density; hence, air’s ability to
provide a buoyant force decreases with in-
creased depth or pressure. At much greater
depths the density of air can reach that of
seawater where it supplies no lift whatever.

Boyle’s law states, in part, that the volume
of a gas will vary inversely as the absolute
pressure; in other words, the greater the
pressure the less the volume. This is another
major factor influencing the use of com-
pressed air for water deballasting. For exam-
ple, Fig. 6.1 shows the interior of the AU-
GUSTE PICCARD with the tanks holding
compressed air for blowing main ballast af-
fixed port and starboard to the top of the

hull. There are 42 air tanks of 1.67-ft? volume
each which are charged to a working pres-
sure of 3,570 psia. The main ballast tanks on
this vehicle, of which there are 12, have a
total capacity of 842.5 ft®. If the entire air
supply was used to blow ballast at 2,500 feet
(1,127.5 psia), 221.6 ft®? of water would be
displaced; in order to completely empty the
main ballast tanks, almost four times the
number of air tanks now carried would be
required. In short, the mere physical re-
quirements of the air tanks to blow water
ballast at great depths would be unaccepta-
ble on a weight and volume basis alone in
present submersibles. Additionally, the air
itself in these tanks would weigh in the
neighborhood of 1,206 pounds (70°F; 3,570
psia), which is in excess of the payload in
most currently operating vehicles. In spite of
the disadvantages noted, compressed air re-
mains the chief source of water deballasting
and buoyancy in the majority of shallow-
diving vehicles.

TABLE 6.4 AIR DENSITY (PCF) AS A FUNCTION OF PRESSURE AND TEMPERATURE*

Temperature (“F)

Depth Pressure
(Ft) PSIA ATM 30 40 50
0 14.70 1.00 00.08 | 00.08 00.08
100 59.14 4.02 00.33 00.32 00.31
200 103.58 7.05 00.57 00.56 00.55
300 148.03 10.07 00.82 00.80 00.79
400 192.47 13.10 1.07 1.05 1.03
500 236.92 16.12 1.32 1.29 1.26
600 281.36 19.15 1.57 1.54 1.50
700 325.80 22.17 1.82 1.78 1.74
800 370.25 25.19 2.07 2.03 1.98
900 414.69 28.22 2.32 74-744] 12.72
1000 459.14 31.24 2.58 DAY) 2.46
1500 681.36 46.36 3.85 3.76 3.67
2000 905 61.58 5.14 5.01 4.90
3000 1351 91.86 7.10 7.50 7.32
4000 1798 122.47 10.24 9.97 9.72
5000 2244 152.83 12.71 12.34 12.02
6000 2695 180.32 14.99 14.58 14.20
7000 3144 213.93 17.14 16.67 16.25
8000 3594 244.62 19.11 18.62 18.16
9000 4046 275.30 20.94 20.41 19.92
10,000 4498 306.08 22.62 22.07 21.53

60 70 80 90 100
00.08 00.08 00.07 00.07 00.07
00.31 00.30 00.30 00.29 00.29
00.54 00.53 00.52 00.51 00.50
00.77 00.76 00.74 00.73 00.72

1.01 00.99 00.97 00.95 00.93

1.24 1.21 1219 1.17 1.15

1.47 1.44 1.42 1.39 1.36

1.70 1.67 1.64 1.61 1.58

1.94 1.90 1.86 1.83 1.79

2.17 2a13 2.09 2.04 2.01

2.41 2.36 2.32 2.27 2.23

3.59 3.52 3.44 3.37 3.31

4.719 4.68 4.58 4.49 4.39

7.15 6.98 6.82 6.68 6.53

9.48 9.25 9.03 8.83 8.64
11.72 11.43 11.16 10.91 10.67
13.85 13.51 13.19 12.89 12.61
15.89 15.46 15.10 14.76 14.43
17.71 17.30 16.90 16.53 16.17
19.44 19.00 18.57 18.17 17.92
21.06 20.59 20.14 19.71 19.31

*Taken, in part and extrapolated, from the U.S. Navy Diving-Gas Manual, U.S.N. Supervisor of Diving, Research Rept. No. 3-69, 1 Oct., 1969,
by Bateele Mem. Inst.

284

BALLASTING SYSTEMS

At least 13 systems can be identified which
are used to provide positive, negative and
neutral buoyancy in submersibles. These
range from venting and blowing steel tanks
to merely hanging a cable on the vehicle and
letting it drag along the bottom. Three meth-
ods of buoyancy control common to almost
half of the past and present submersibles
consist of a positively buoyant pressure hull;
a main ballast (MBT) system to attain sur-
face buoyancy and possibly negative descent
buoyancy; and a variable ballast (VBT) sys-
tem to attain small changes in buoyancy
when submerged. In addition to these three
methods there are a number of others de-
signed to accomplish the same results but in
different ways (Table 6.5).

One method used to gain negative buoy-
ancy is the addition of lead or steel ballast to
the vehicle based on post-construction calcu-
lations and/or sea trials. Although normally
used for minor weight adjustments, such
weight may be made jettisonable and thus
serves an emergency role.

Ballasting systems are classified herein as
Reversible and Irreversible—the distinction
being that reversible systems are capable of
providing at least one positive and negative
cycle during a dive and Irreversible systems
provide only a one-time, one-way function.
For example, ascent and descent ballasting
systems assist the vehicle to dive and then
ascend and, therefore, provide both negative
and positive buoyancy. Syntactic foam pro-
vides the vehicle with positive buoyancy
only. The problem with this classification can

Fig. 6.1 Interior of AUGUSTE PICCARD. Overhead rows of cylindrical tanks port and starboard hold a total of 842.5 cubic feet of compressed air for blowing main and variable
ballast.

285

TABLE 6.5 SUBMERSIBLE BALLAST AND BUOYANCY METHODS

Pres-

Inflat-

Ascent/

Depth
Submersible (ft)
HIKINO 20
GOLDFISH 100
NAUTILETTE 100
ALL OCEAN INDUSTRIES 150
PC3-X 150
PORPOISE 150
STAR I 200
SUBMANAUT (Helle) 200
K-250 250
MINI DIVER 250
SPORTSMAN 300 300
SUBMARAY 300
KUMUKAHI 300
PC-3A1 300
PC-3A2 300
NEREID 330 330
SEA RANGER 600
SPORTSMAN 600 600
SUBMANAUT (Martine) 600
TECHDIVER 600
ASHERAH 600
BENTHOS V 600
MAKAKAI 600
NEMO 600
PAULO | 600
SURV 600
KUROSHIO II 650
NEREID 700 700
PC-8 800
SHELF DIVER 800
YOMIURI 972
MERMAID I/II 984
MERMAID III/IV 984
HAKUYO 984
TOURS 64 984
TOURS 66 984
GUPPY 1000
NEKTON ALPHA 1000
NEKTON BETA 1000
NEKTON GAMMA 1000
SEA-RAY 1000
SEA LINK 1000
SNOOPER 1000
PS-2 1025
PISCES |
STAR II 1200
AQUARIUS 1200
VOL-L1 1200

Descent

MBT VBT! VBT? Weights Anchor

Cable

286

sure
Hull

Syn-
tactic Hard
Foam Tanks

able
Bag

Small

Weight Steel

Drop

Shot

Gaso-
line

TABLE 6.5 SUBMERSIBLE BALLAST AND BUOYANCY METHODS (Cont.)

Ascent/ Pres- Syn- Inflat- Small
Depth Descent sure tactic Hard able Weight Steel Gaso-
Submersible (ft) MBT VBT! VBT? Weights Anchor Cable Hull Foam Tanks Bag Drop Shot line
PCS5C 1335 ° e
SURVEY SUB | 1350 e e
DEEP DIVER 1350 ° e
SP-350 1350 e °
SEA OTTER 1500 e e
DEEP VIEW 1500 e e e
SP-500 1640 e e
SP-500 1640 ° e
PISCES | 1200 e e e
SHINKAI 1968 e .
ARGYRONETE 1970 e
GRIFFON 1970 e
BEN FRANKLIN 2000 e e e e °
SDL-I 2000
BEAVER 2000 ° ° e
DEEP JEEP 2000 ° e(-) e
DEEP STAR 2000 2000 e e e(-) ° e o(+)
STAR III 2000 ° e e
AUGUSTE PICCARD 2500 ° ° e
PISCES II 3000 e e °
PISCES III 3000 e e e
DSRV-I 3500 e e e e
DEEPSTAR 4000 4000 e ° e e ° e(-) e
DSRV-2 5000 e e e e
TURTLE 6500 e e e
SEA CLIFF 6500 e e °
PISCES IV 6500 ° e e
PISCES V 6500 e e °
PISCES VI 6500 e e e
DOWB 6500 e e e e
DEEP QUEST 8000 e ° ° e
SP-3000 10082 ° e o(-) e
ALVIN 12000 e e e ° e
FNRS-2 13500 e
FNRS-3 13500 e
ALUMINAUT 15000 e e e
DEEPSTAR 20000 20000 e ° e 0
TRIESTE II 20000 e Cc 0
TRIESTE III 20000 = =
TRIESTE 36000 e e
ARCHIMEDE 36000 ° e e

VBT!=Hard Tanks and Seawater
VBT=Hard/Soft Tanks (Oil)

(-)}=Negative Buoyancy
(+)=Positive Buoyancy

287

be seen with the dropping of small weights
which serve, primarily, to make the submers-
ible lighter, but also served, initially, to pro-
vide sufficient negative buoyancy to allow it
to descend; the same may be said of iron
shot. A further distinction, then, between
the two systems is that they are grouped
according to their primary ballasting func-
tion.

Chapter 14 deals with other ballasting de-
vices in the form of an emergency weight
which is dropped to provide positive buoy-
ancy. Because these methods are not rou-
tinely employed, it will suffice to note that
they constitute another means of gaining
positive buoyancy.

The following descriptions of various bal-
lasting/deballasting devices are brief by ne-
cessity, for only a handful of vehicles, e.g.,
the PISCES series, use similar procedures
and components. Individual descriptions of
each vehicle’s ballasting system is provided
in Chapter 4. Most of the systems perform
essentially the same function from vehicle to
vehicle. Consequently, a general description
of the system’s function, location, configura-
tion, etc., where it is amenable to this for-
mat, is presented. The examples cited are
selected to include one system which is fairly
representative of all, or one that represents
an advancement over or significant depar-
ture from the general field.

The capacity of main ballast tanks varies
from vehicle-to-vehicle and is not controlled
by any standards. The Marine Technology
Society recommends that main ballast tank
capacity should not be less than 10 percent of
the vehicle’s displacement at normal diving
trim. The American Bureau of Shipping, on
the other hand, does not require a minimum
capacity, but must be satisfied that the vehi-
cle can stay on the surface without endan-
gering the safety of the vessel under normal
sea conditions (Sea State 3 or as defined by
the designer) and with adequate freeboard.
In most vehicles the 10-percent displacement
margin is generally attained or exceeded.

Reversible Systems

Main Ballast Tanks:
Function: To provide large changes in posi-
tive and negative buoyancy and provide ade-

288

quate freeboard for maneuvering and for the
ingress/egress of personnel to the pressure
hull.

Operation: On the surface the MBT’s are
empty. Vent valves are located at the top of
the tanks and flood valves at the bottom; the
latter may or may not be free flooding. To
dive the vent valves are opened by the opera-
tor and seawater flows in through the flood
openings forcing air out through the top. In
the majority of vehicles an indicator light or
dial warns when the MBT’s are fully flooded,
at which time the vent valves are closed.
When the MBT’s are full, the submersible
may be at neutral buoyancy or slightly nega-
tive and begins to descend. If the former is
the case, smaller capacity variable ballast
tanks are flooded or releasable weights are
added to provide negative descent buoyancy.
In a few submersibles, the MBT’s can be
fully blown at operating depth; in the major-
ity, the MBT’s are not blown until the vehi-
cle reaches the surface where additional
freeboard is required. In all vehicles, com-
pressed air is used to blow the MBT’s when
surfaced.

Location: MBT’s generally straddle the pres-
sure hull and are located as high on the
vehicle as practical to provide stability when
surfaced by raising the center of buoyancy in
respect to the center of gravity.

Configuration: Virtually any configuration is
acceptable which is compatible with the pres-
sure hull shape and offers least hydrody-
namic drag.

Material: Steel of various compositions, fi-
berglass, aluminum. Material whose
strength is sufficient to withstand wave slap
and the rigors of shock during transport and
at-sea handling.

Example:

a) The submersible BEN FRANKLIN
has four MBT’s which straddle the pressure
hull fore and aft (Fig. 6.2) and provide ap-
proximately 18 inches of freeboard when dry.
The tanks are constructed of laminated-
polyester and fiberglass, !/4 to 3/s inch thick,
and contain 11 fiberglass ribs (filled with
syntactic foam) spaced within each tank to
provide additional strength. Each tank has a
capacity of 162 ft? and all four provide ap-
proximately 41,500 pounds of positive buoy-

ancy when dry. The tanks are designed to
withstand 1,000-psf wave slap with a safety
factor of 2. At 2,000-ft depth 50 percent of the
flooded tank can be blown for emergency
ascent only. Six free-flooding openings are in
the bottom of each tank and a solenoid-
operated vent valve is located on the top and
at the rear of each tank. To dive, the sole-
noids are activated and open the vent valves;
this allows water to enter the bottom and an
indicator light informs the operator when
the tanks are full. The valves shut at any
time the operator releases the vent switch.
With the MBT’s fully flooded, the vehicle is
at approximate neutral buoyancy and addi-

emt ae 3 ora
oe

tional ballast causes it to descend. To blow
the tanks dry, high pressure air (2,844 psi) is
used and stored in six flasks mounted port
and starboard between the deck and MBT’s.
Each side has a flask of 21-, 7- and 5-ft?
capacity each holding 262, 125 and 88 pounds
of air, respectively. Each flask is piped
through its own hull valve, pressure gage
and control valve and then grouped near the
operator’s console where they are mani-
folded together and fed through a single
pressure reducer (1,422 psi) for normal blow-
ing operations. In the event of an emer-
gency, the relief valve can be bypassed and
high pressure air (2,844 psi) fed directly to

3 fol ,

t

| | i

Fig. 6.2 Main ballast tanks of BEN FRANKLIN straddle its pressure hull. Cylinder between sail and MBT holds compressed air to blow water ballast. (Grumman Aerospace Corp.)

the MBT. Passing through a hull valve each
line runs through a check valve, a pressure-
restricting diaphragm and into a blow valve
aft and just below the vent valves.

b) The All Ocean Industries submers-
ible employs compressed air to blow the
MBT’s, but in a manner distinctly different
from BEN FRANKLIN’s and apparently from
all other vehicles. It operates in the follow-
ing manner: Two MBT’s vent directly into
the pressure hull; to dive, the operator opens
a vent valve which allows water into the
tanks and forces entrapped air from the
tanks into the pressure hull. Because pres-
sure will build up in the hull, a second valve,
called a snorkel valve, is opened to allow the
escape of air outside the hull. When a little
water appears at the vent valve, it is se-
cured, as are three flood valves leading to
the MBT’s. The snorkel valve is also closed
after the MBT and flood valves are secured.
With the MBT’s full, the vehicle is still
slightly positive and VBT’s must be flooded
to attain negative buoyancy. To blow the
MBT’s on the surface, the two MBT flood
valves are opened and air from one of two
scuba tanks outside the hull is introduced
into the MBT. When bubbles can be observed
coming out of the MBT’s, the tanks are as-
sumed empty, and the hatch (dome) may be
opened.

Variable Ballast Tanks:

Function: To provide small scale buoyancy
adjustments.

Operation: Two approaches are used to at-
tain variable ballasting systems. In the most
generally used approach there is a hard tank
into which seawater is introduced by means
of the ambient pressure differential to attain
negative buoyancy and then expelled by
either compressed air or a pump to attain
positive buoyancy. In the second case, gener-
ally on the deep vehicles, a system is used
which employs a pressure-resistant tank con-
nected to collapsible (flexible) oil-filled bags.
When surfaced, the spheres are partially
filled with oil and air at atmospheric pres-
sure; the bags are fully collapsed. To gain
positive buoyancy when submerged, the oil is
pumped into the bags which expand and
displace seawater, thus, providing positive
buoyancy. To gain negative buoyancy, the oil

290

is permitted to flow back into the rigid tank.
More accurately, this hard/soft tank system
is termed a variable displacement system
since the vehicle weight remains constant.
Evident from Table 6.6 is the absence of air-
blown VBT’s below 2,500 feet for reasons
given earlier. When hard tanks and water
are employed as the variable ballast system
on present submersibles, high pressure
pumps are used to expel water from the
tanks below 5,000 feet.

Location on Vehicle: AS 1s evident from Table
6.6, there is no standard location for variable
ballast systems. In some vehicles the sys-
tems are in the pressure hull (this arrange-
ment saves the expense accompanying a sys-
tem exposed to seawater and ambient pres-
sure), and in others the system is external to
the pressure hull, thereby saving limited in-
ternal space in the pressure hull. Those vehi-
cles using variable displacement (hard and
soft tanks) systems must locate at least the
soft part of the system external to the hull.
As a general rule, most VBT’s are situated
below the vehicle’s center of gravity to keep
the center of gravity low. This is the case
with AUGUSTE PICCARD and BEN FRANK-
LIN, where the VBT’s are in the vessels’
keels. When two or more tanks are used, they
are balanced port and starboard or fore and
aft; in the latter situation the system may
also serve as a trim system by differentially
filling the tanks.

Configuration: Systems external to the pres-
sure hull employing only air and hard tanks
have no particular geometrical configuration
on the shallow submersibles, but are gener-
ally spheres or cylinders on the deep vehi-
cles. Where the tank is external to the pres-
sure hull it must withstand the same forces
as the pressure hull. Because the tank may
be pressurized above ambient during ascent,
tensile stress is a factor. Where the VBT is
within the hull at atmospheric pressure, ten-
sile stresses are the overriding considera-
tion.

Soft/hard tank systems are required to
withstand ambient pressures and for this
reason the hard tank component is always
spherical. Being either pressure-compen-
sated or collapsed, the soft tank component
can be any shape.

TABLE 6.6 VARIABLE BALLAST SYSTEMS CHARACTERISTICS

Fill/Empty System

Procedure _ ee ~ Gar) Hard Hard mat Quantity

Pump Air (Ibs) Hard Tanks unmeriblel Hard Soft
Submersible Out In Blow Tanks Only Tanks = Tanks
PC3-X e 320 e F/A (ex.) 2
STAR | e NA e (in) 1
SUBMANAUT (Helle) e e 110 e (in) 1
K-250 e NA e NA 1
SPORTSMAN2 e NA e (in) 1
SUBMARAY e 68 e (in) 1
PC-3A 1&2 e 320 e F/A (ex.) 2
KUMUKAHI e e 93 e (in) 1
SUBMANAUT (Martine) e e 4280 e (in) and Keel 6
TECHDIVER e 400 e F/A (ex.) 2
ASHERAH e 340 e (ex.) 1
BENTHOS V e NA e (in) 2
MAKAKAI e e 400 e each corner 4
KUROSHIO II e 888 e F/A (in) 2
SURV e 80 e Aft (ex.) 2
SHELF DIVER e ® 780 e F/A (ex) 2
MERMAID2 e NA e (in) 2
HAKUYO NA e (in) 2
NEKTON2 e 30 e (in) 1
SEA-RAY e NA e F/A (ex.) 2
SEA LINK e 170 e P/S (ex.) 2
STAR II e@ 130 e (ex.) 1
VOL-L1 e 715 e F/A (in) 2
PC5C e 120 e P/S (ex.) 2
SURVEY SUB | e 440 e F/A (in) 2
DEEP DIVER e @(aft) 731 e F/A (in) 6 2
SP-350 e 96 e (in) 1
SEA OTTER e 125 e (ex.) Fore 2
SP-500 e 44 e (in) 1
SHINKAI e 660 e (ex.) amidship 1
ARGYRONETE 2620 e F/A 2/2
BEN FRANKLIN e 6800 e P/S (ex.) 1/1
BEAVER e 1474 e P/S/Aft (ex.) 1/1/1
PISCES2 e 300 e Aft (ex.) 1 2
DS-2000 e 300 e P/S (ex.) 2/2
STAR III e 270 e (ex.) 1
AUGUSTE PICCARD e 4315 e (in) (ex.) 2/1
DSRV-1&2 e 1060 e F/A 1/1
DS-4000 e e NA e P/S 2 1
TURTLE e e 600 e P/S 6 2
SEA CLIFF e e 600 e P/S 6 2
DOWB e e 512 e F/A (ex.) 2 2
DEEP QUEST e e 1828 e P/S (ex.) 2
ALVIN e 600 e (ex.) 6 2
DS-20000 e @(He) NA e NA NA NA

TE/A = Fore/Aft; (in) = inside pressure hull; (ex.) = external to pressure hull; P/S = port/starboard
2a classes of the submersible.

291

Materials: Hard tank systems employ the pump water in or out of the tanks to provide

same material for the VBT as they do for the buoyancy changes. The non-water volume of
hull, though in some eases a stainless steel is the ballast tanks is pressure-compensated to
used. Soft/hard tank systems vary in the 10 to 20 psi above ambient by air stored in
nature of the material used for the hard four high pressure cylinders (thereby negat-
component. ALVIN, SEA CLIFF and TUR- ing the need for pressure-resistant VBT’s).
TLE use titanium spheres, while PISCES IV The high pressure air is reduced to ambient
and V use HY-100 steel, the same material as pressure by a differential pressure-regulat-
found in the pressure hull. The flexible bags ing system, and the ballast tanks are pro-
in the hard/soft tank system of TURTLE and vided with relief valves to vent air on ascent.
SEA CLIFF are composed of reinforced rub- To attain fore or aft trim, water may be
ber. pumped fore or aft between tanks, and taken
Example: onboard on one side of the vehicle and over-
(a) The variable ballast system of boarded on the other side to attain roll an-
MAKAKAIT provides not only positive and gles.
negative buoyancy changes, but changes in (b) Although now converted to a hard
trim and roll (or heel) as well. From refer- tank system, ALVIN’s original variable dis-
ence (4), ballast tanks are mounted on each placement system was typical of other vehi-
corner of the vehicle (Fig. 6.3), and each tank cles and worked in the following manner (5).
has a capacity of 199 pounds of seawater. Two large, flexible oil-tight bags were de-
Two ballast pumps (one supplying each side) signed to fit into floodable fiberglass com-

TRIM TANK

FORWARD nN STARBOARD BALLAST

PUMP-AND-VALVE UNIT

PRESSURE-
“. REDUCING REGULATORS
~

PORT BALLAST
PUMP-AND-
VALVE UNIT

“
SS

BALLAST AIR
STORAGE

BALLAST WATER LINES

— — — ~—_ COMPENSATING AIR LINES
Fig. 6.3 MAKAKAI's ballast control schematic. (From Ref. (4)]

292

partments and six pressure-resistant alumi-
num spheres were located in the center por-
tion of the vehicle. A high-pressure gear
pump pumped automatic transmission fluid
from the spheres to the flexible containers
(Fig. 6.4). Air at atmospheric pressure filled
the spheres when emptied of working fluid.
Since the flexible containers were exposed to
sea pressure, the pump had to move the

working fluid against sea pressure. A revers-
ible DC motor provided power for the pump.
To control the system, a positive-seating
(leak-free) ball valve was incorporated into
the circuit. The bali valve was opened and
closed by a suitable gear train and electric
motor. The two motors were under the direct
control of the pilot who could control the
buoyancy of the vehicle from a heavy condi-

VARIABLE BALLAST SPHERES

FLOAT VALVE
ASSEMBLY

BACK
PRESSURE
VALVE
ASSEMBLY

PRESSURE

FILTER

FIEE—
BLEED

MOTORIZED
BALL VALVE

Fig. 6.4 ALVIN’s variable-ballast system diagram. [From Ref. (5)]

293

tion of 600 pounds to a light condition of 600
pounds. A float switch was included to open
the electric motor circuit when the working
fluid was exhausted from the spheres. A
pressure transducer sensed absolute pres-
sure in the spheres. The readout from this
pressure was calibrated to show the quantity
of oil in the spheres. Relief valves were in-
cluded to protect the pump motor in case of
valve failure and a filter was provided to
capture any stray particles in the fluid. Fluid
was filtered whenever it was allowed to flow
back into the sphere. A check valve system
was employed to bypass the filter in the
reverse direction.

DEEPSTAR 4000 used its variable dis-
placement system in a somewhat different
fashion than the designers intended when
the need for more rapid buoyancy changes
arose. In conjunction with its small weight
drop system (described below) the system
worked as follows: At neutral buoyancy, the
flexible bag was full; if positive buoyancy
was needed, a 3.4-pound weight was dropped;
if negative buoyancy was necessary, fluid
was pumped from the flexible bag. Hence, a
round trip from negative-to-positive-to-nega-
tive was reduced by half that required if the
total variable displacement system was em-
ployed.

Ascent/Descent Weights:

Function: To assist the submersible in de-
scending and ascending to and from the bot-
tom while conserving electrical power.

Operation: Generally one weight is hung fore
and another aft; both are attached prior to
launching. When the MBT’s and VBT’s are
full, the vehicle descends to some depth short
of the bottom, and the descent weight is
dropped to give the vehicle approximate neu-
tral buoyancy. At dive termination, the as-
cent weight is dropped allowing the vehicle
to surface. On some vehicles, e.g., ALVIN, a
descent weight only is used to hasten the
initial descent and, at the same time, con-
serve electrical power which might otherwise
be required to run the vertical thrusters
during descent.

Location on Vehicle: On the French vehicles
SP-350 and SP-3000 and on DS-4000, the
descent weight is on the stern centerline and
the ascent is forward on the brow.

294

Configuration: Any compatible to the vehicle.
Material: Lead or cast iron.
Example:

(a) DEEPSTAR 4000 dives with 220-
pound cast iron descent weight aft which
causes the vehicle to descend bow high. At
some predetermined depth, the descent
weight is hydraulically jettisoned, and the
vehicle comes to the near-horizontal posi-
tion. At dive termination, a 187-pound ascent
weight mounted forward is dropped, and
DEEPSTAR 4000 ascends (Fig. 6.5). A nega-
tive feature of this system lies in the fact
that once the ascent weight is dropped, the
vehicle cannot descend again without addi-
tional negative buoyancy. In the event of the
submersible ascending into an overhanging
cliff or obstruction, it would be unable to
descend again without external assistance.

(b) DEEPSTAR 4000’s sister submers-
ible DS-2000 combines both a descent weight
and a hard tank. The descent weight per-
forms the same function as in DS-4000, but
instead of an ascent weight, a 120-pound-
capacity tank (which is flooded at the start of
the dive) has been substituted. When the
dive is terminated, the seawater is blown
from the hard tank and the vehicle rises.
This allows an increase of 120 pounds in
payload owing to the absence of the ascent
weight.

Anchor:

Function: To provide static stability while
working on the bottom or hovering. It also
may serve as a kedge to assist in pulling
large devices on the bottom.

Operation: A hydraulically driven winch, ca-
ble, and anchor can be employed by the
operator as desired.

Example:

Two submersibles routinely carrying
anchoring devices are BEAVER and NEMO.
While both vehicles are quite different, their
anchoring systems are essentially similar.
Hence, NEMO will serve as an example of
both and its description is taken from refer-
ence (6).

NEMO’s primary vertical mobility and
station-keeping modes are provided by the
winch/motor system housed in the main bal-
last tank. The winch drive motor is a Vickers
fixed-displacement, reversible hydraulic mo-

tor and is located in a housing directly be-
neath the bottom plate of the pressure hull,
with pressure compensation being provided
by reference to the hydraulic distribution
housing. The winch motor drives a drum
which holds 1,200 feet of !/4-inch non-rotating
wire rope. The winch features a barrel gear
level wind assembly and cable guide to as-
sure proper cable laying. The guide also
houses a hydraulic cable cutter, pyrotechnic
cable cutter and an interlock sensing assem-
bly to override the winch control. This inter-
lock arrangement automatically slows and
stops the winch as the anchor approaches
NEMO.

Winch operations are controlled by
four switches on a control console. The winch
motor switch and the winch jog switch sup-
ply power to the winch speed and direction
switches, which in turn actuate hydraulic

solenoid valves. The winch motor switch is
used for continuous operation, and the jog
switch is used for momentary operation. If
the hydraulic generator is on and either the
jog or the run switch is actuated, the winch
will start operating in the direction selected
by the direction switch (“reel in” or “reel
out’) and at the speed selected on the speed
switch (“fast’”’ or ‘‘slow’’). The winch lock
switch actuates a solenoid valve which pro-
vides a hydraulic lock on the winch motor.
This lock is automatically overridden when
either the run or jog switch is used. In
addition, the winch has four ways in which it
may be free-wheeled. To reset the interlock
system (which automatically slows and then
stops the incoming anchor before it reaches
the winch), the jog switch is operated twice.
A 25-in.? accumulator is incorporated in the
winch motor hydraulic loop to cushion sud-

SHIP

ws DESCENT WEIGHT (220-Ib)
2B PRODUCES NEGATIVE
7 BUOYANCY FOR
Ve POWER-FREE DESCENT
[
\ HELICAL DESCENT PATH DUE TO
~ FREE DESCENT DYNAMICS /
as ey cee \ ~ Ha
SH EAT! Ae es N
ASCENT WEIGHT (187-Ib) RELEASED AT \
CONCLUSION OF MISSION \
DEEPSTAR IS NOW POSITIVELY \

BUOYANT AND RISES
PITCH CONTROLLED BY

\ SHIFTING OF MERCURY
N FORWARD AND AFT
~ Ls

_—_ —

ASCENT WEIGHT

AT DESIRED OPERATING DEPTH \
DESCENT WEIGHT IS RELEASED
TO MAKE DEEPSTAR NEUTRALLY \
BUOYANT \

_— —_- _— —_ _

SS |

MOVEMENT FORWARD AND

AFT USING PROPELLERS
DESCENT WEIGHT

Fig. 6.5 DEEPSTAR 4000's descent/ascent weight system.

295

den anchor stops. Although a variety of an-
chors may be used, a 380-pound clump was
employed. A manually operated hydraulic
system located inside the pressure hull
serves as a means of cutting the anchor
cable and controlling the mechanical winch
brake.

Cables:

Function: To provide a means of maintaining
constant altitude within range of bottom
viewing.

Operation: Consists merely of a cable (wire
rope or chain) of desired length and weight
which is attached to the vehicle on or near
the keel. During descent, the submersible
slowly nears the bottom with the cable arriv-
ing first and accumulating there until its
weight loss puts the vehicle at neutral buoy-
ancy. At this point, the vehicle is essentially
anchored in the vertical, but is free to move
in the horizontal.

Example:

All of the bathyscaphs employed a ca-
ble for altitude control at one time or an-
other. The only submersible to extensively
use such a device was BEN FRANKLIN on its
30-day drift in the Gulf Stream. This system
is described below.

A 40-foot-long 100-pound chain, housed
in a flexible polyvinyl chloride (PVC) hose,
was attached to BEN FRANKLIN’s stern. A
weak link stood between the chain and vessel
which would break before the vehicle
reached its capacity to attain full positive
buoyancy in the event of the chain fouling.

In operation, the submersible bottomed
and then blew its VBT’s enough to ascend
slightly to a point some 20 feet off of the
bottom where the chain restrained it. The
current then caused the vehicle to move and
drag the chain behind. With the chain at the
stern providing drag, the submersible was
oriented with its bow pointed downstream
and it proceeded along as if under power.
When a mound or other minor relief feature
was encountered, the excess chain accumu-
lating on the feature decreased the vehicle’s
weight and it ascended accordingly; in the
event of a depression, the excess chain hang-
ing suspended caused the vehicle to descend.
While there are drawbacks to this method of
buoyancy control, for near-bottom cruising

296

at a specific altitude and over relatively
smooth terrain, the system is virtually un-
beatable. According to the elder Piccard in
In Balloon and Bathyscaphe, this technique
was first used by the balloonist for cruising
at low altitudes over land.

Irreversible Systems

Pressure Hulls:

In most submersibles (excluding the bathy-
scaphs) the pressure hull exerts a positively
buoyant force, the extent of which depends
on the W/D ratio. This force is not constant
at all depths owing to the compressibility of
the hull which reduces its displacement. The
SP-3000, for example, carries two jettisona-
ble 33-pound weights which are released to
compensate for loss of positive buoyancy
through hull shrinkage. The bathyscaphs are
a different situation wherein the pressure
hull is negatively buoyant and the problem is
one of getting it to ascend rather than de-
scend.

Syntactic Foam:

For great depths syntactic foam is one of
the most promising positive buoyancy mate-
rials. The foam consists of a mixture of hol-
low microspheres embedded in a resin ma-
trix. Some foams use plastic or glass micro-
spheres, and matrix materials of polyesters,
phenolics, polyethylenes or vinyls (7). Sev-
eral factors make syntactic foam an attrac-
tive buoyancy material:

Low density

High hydrostatic strength

Low water absorption

Immunity to catastrophic failure

Bulk modulus equal to or slightly higher

than seawater

Fabricability to irregular shapes by cast-

ing or machining

One of its greatest features is the relative
ease with which it can be machined or cast to
fill small, large, and irregularly shaped voids
within the exostructure. In some eases, it is
merely attached as blocks to the vehicle or
strapped into an existing cavity to provide
greater payload for a specific dive. At times,
syntactic foam performs more than one func-
tion. Figure 6.6 demonstrates its uniqueness
by serving both as positive buoyancy mate-
rial and a stabilizing rudder on TURTLE.

Considerable effort is being expended by
both government and industry to decrease
the foam’s density and, correspondingly, its
cost. Present efforts at NSRDC are aimed at
developing a 34-pcf syntactic foam for depths
of 20,000 feet (8). Both the DSRV’s and DEEP
QUEST employ syntactic foam of 36-pef us-
ing glass microspheres. Standard 42- to 44-
pound foams cost in the neighborhood of $10
to $15/pound; 34-pound foam is projected to
be some $40/pound in orders of 40,000
pounds. An indication of the expense in-
volved is gained by considering that DS-
20000 would carry some 13,060 pounds of 42-
pound syntactic foam.

According to Rosenberg (7) a 30-pound
foam for 20,000 feet should be possible, but
considerable development in the glass mi-

crosphere system is required before this goal
can be realized. Owing to its wide application
by the marine community—not only in sub-
mersibles but in salvage and other areas as
well—syntactic foam appears as promising
today as did acrylic plastic in its infancy.

Hard Tanks:

Six submersibles can be identified that use
pressure-resistant tanks as a means of at-
taining positive or negative buoyancy. Three
of these (SP-3000, DEEP JEEP, DS-2000)
use pressure-resistant tanks as a component
of a variable ballast system whereby the
tank is either blown or flooded and played
against an opposing system, such as a small
weight drop.

Fig. 6.6 Syntactic Foam blocks cut to serve for stabilization and positive buoyancy on TURTLE.

In the DSRV’s two 5,564-pound-capacity
tanks are used to store water that is pumped
out of the mating skirt after it has attached
to a stricken submarine; in effect, these
tanks work as both positive and negative
buoyancy systems although their function-
ing is strictly a by-product of the rescue
mission.

ALVIN, in its early design, incorporated
nine aluminum (7178-T6) spheres within a
syntactic foam (42 pef) package to provide
approximately 4,000 pounds of positive buoy-
ancy (Fig. 6.7). To prevent corrosion and
stress corrosion, oil surrounded each sphere.
The spheres were later discarded and now
the entire package consists solely of syntac-
tic foam.

Collapsible Bags:
Carried within each sphere of the DSRV

are four collapsible bags. Prior to a rescue
dive, the bags are filled with water to pro-
vide 4,080 pounds of negative buoyancy.
When the rescuees are aboard the DSRV, the
bags are drained into the stricken submarine
to compensate for the weight of the rescuees.

Small Weight Drop:

A system common to all French and West-
inghouse vehicles involves the dropping of
small lead weights to incrementally attain
positive buoyancy; DEEPSTAR 4000 may
serve as an example. Located immediately
aft of the pressure sphere 3.4-pound lead
weights hang on a notched track trending
port-starboard. When the pilot activates the
command lever, hydraulic pressure shifts a
double-ended piston to one side and rachet
fingers attached to a sliding carriage engage

Fig. 6.7 ALVIN's original buoyancy package consisted of syntactic foam and aluminum spheres The total package provided 4,000-Ib positive buoyancy. (WHO!)

one of the rachets, moving it inboard °/16 of
an inch. This movement removes the support
for a weight and the weight falls free of the
housing. The next time hydraulic pressure is
applied, the piston and carriage move in the
opposite direction. A rachet finger engages
the other rachet bar and a weight is dropped
as the bar moves inboard.

DEEP JEEP incorporated the same princi-
ple with thirty 4-pound steel plates sur-
rounding its battery pod; in this case, each
plate was held in place by an electromagnet
which, when power ceased, dropped the
weight. In the event of a total power failure
all weights were automatically jettisoned.

Iron Shot:

Adopted from the FNRS-2, the dropping of
iron shot to attain positive buoyancy has
been incorporated into several contemporary
submersibles and was used on all the bathy-
seaphs (Table 6.5). The type of shot used
resembles ‘‘BB’s” and the only hard require-
ment is that the shot have magnetic proper-
ties. The younger Piccard, in Seven Miles
Down, related the difficulty in attaining shot
with sufficient residual magnetism in the
U.S., thus necessitating ordering shot from
Italy to accomplish TRIESTE’s early mission
leading to the deep dive.

In concert with the host of dissimilar pro-
cedures to accomplish similar functions from
submersible-to-submersible, no two shot sys-
tems are identical in location of shot tanks or
method of shot control, though all use ‘‘fail-
safe’”’ electromagnets to hold in the shot.
BEN FRANKLIN is one example of this
method of attaining positive buoyancy.

The shot ballast system of BEN FRANK-
LIN has two functions—to adjust the buoy-
ancy of the boat by metering out shot
through a specially designed electromagnetic
valve, and to provide 6 tons of buoyancy
(6,372 pounds per tank) in an emergency by
rapidly dropping all of the shot (release of
hydraulic pressure on a piston opens a large
door at the bottom of the shot ballast tank).

Separating the two main ballast tanks port
and starboard, the shot ballast tanks are
filled with iron shot (Globe Steel S-780C) up
to a point about 4 inches below the waterline.
The tanks are free-flooding and are always
open to the sea in order to pressure compen-

299

sate the tanks and to prevent rusting of the
shot into an unmanageable agglomeration.
When completely immersed in seawater, the
corrosive action on the shot is minimized and
the granules remain free.

Each shot ballast tank is fixed to the sides
of the hull by attachments similar to those
on the main ballast tanks but with elongated
bolt holes designed to allow for any play
which occurs during expansion or compres-
sion of the pressure hull. The tanks are
constructed of sheet steel supported inter-
nally by steel truss frames.

The shot dropping systems consist of two
electromagnetic valves—one for each shot
tank. Each valve has two sets of coils—110
VDC and 28 VDC. The 110-volt holding coils
are made up of soft iron cores which can be
permanently magnetized by coils when sup-
plied by 110 volts. These “magnetic valves”
are used to hold the soft iron shot in the
ballast tanks when permanently magnetized
and the power is removed. This is accom-
plished when the shot ballast becomes mag-
netized in the “throat” of the valve. The
valve can be demagnetized to release its hold
on the shot by cycling the 110-VDC voltage
through progressing voltage dropping resis-
tors. Dropping the voltage and cycling both
the plus and minus values through the coils,
the cores become totally demagnetized since
any residual magnetic effects are erased in
this manner.

The 28-volt metering coils are essentially
electromagnets which are used to control the
flow of the soft iron shot through the valves.
This is accomplished when the 110-volt coils
are demagnetized and the 28-volt coils are
de-energized. Flow of shot is stopped when
the full 28 volts are used to energize the
electromagnet and the soft iron shot in the
valve’s throat is magnetized. This condition
can be maintained when the voltage is re-
duced to 14 volts.

The electric metering system, used to
measure the amount of shot in each of the
two tanks, consists of a transformer verti-
cally oriented in each tank. The primary coils
are excited by 20 VAC which has been
stepped down via a transformer from the
110-VAC bus. The secondaries of the meter-
ing transformer are returned into the boat
and terminated into voltmeters. The voltage

recorded on the meter is directly propor-
tional to the amount of shot in the tank,
since the level of shot represents the amount
of mutual coupling between the two coils
and, hence, the induced voltage on the sec-
ondary.

A specially constructed timer is installed
in the pilot’s console and consists of two stop
watches each connected to one of the shot
ballast circuits. The timer automatically
starts and stops as shot ballast is metered
out of each hopper. The quantity of shot
jettisoned by the operator is simply calcu-
lated by time units as 4.4 pounds of shot fall
through the valve per second.

An emergency shot ballast system was in-
stalled to provide a quick release of ballast in
case of flooding or some other emergency
requiring rapid surfacing or extra buoyancy.
Hydraulic pressure (140 kg/em?) is built up in
an accumulator which in turn holds a port
and starboard hydraulic piston in a position
that prevents a trap door at the bottom of
each tank from opening. By opening a valve
that allows the hydraulic fluid to return to
the reservoir, hydraulic pressure is released
on the piston which in turn allows the trap
door to open. (The weight of the shot causes
the piston to move to the opposite end of the
cylinder when hydraulic pressure is re-
leased.) The trap door, hinged on the oppo-
site side, allows the shot to drop rapidly. If a
piston fails to move due to corrosion or some
other reason, hydraulic fluid can be forced to
the opposite side of the piston to provide an
additional force. By operating valves in rapid
succession, the entire operation, including
power to the opposite side of the piston, is
accomplished very quickly.

Seals at each end of the piston prevent
seawater from entering the cylinder. Around
the rod is fitted a stainless steel cylinder or
sleeve capped with a rubber boot. The cylin-
der is packed solid with grease and the boot
can move in and out slightly with sea pres-
sure. This end of the piston is untouched by
seawater and cannot corrode.

If the boat has been towed or in port for
several days just prior to diving, the trap
door/piston mechanism is tested by having a
diver install a special screw fitting in each
tank that holds the trap door in place. The
piston is then moved by applying power in

300

the opposite side of the cylinder and a diver
can observe whether or not the piston re-
tracts.

The logistics involved with steel shot bal-
last can be somewhat restrictive on open-sea
operations. Because the majority of sub-
mersibles using this method are too large to
be launched and retrieved for each dive, they
must be replenished while in the water. Gen-
erally, this is accomplished in a harbor or
protected area (Fig. 6.8) where the sea state
is not a problem; however, on occasion it is
necessary to transfer shot at sea. When this
is the case, it can be quite difficult transfer-
ring several thousand pounds of shot in 25-
pound bags from the support ship to the
vehicle.

Gasoline:

The positive buoyant force on all bathy-
scaphs is derived from gasoline contained in
a metallic float. Several factors enter into
the selection of petroleum hydrocarbons for
deep-water buoyancy applications:

—Gasoline is readily available and at rela-
tively low cost.

—Although not as effective as air at shal-
low depths, gasoline retains most of
its buoyancy at any depth.

—Petroleum hydrocarbons can reach a
density of 0.66 gm/cm*, which is good
relative to seawater (1.025 gm/cm’).

On the other hand, there are several disad-
vantages, the main one being flammability.
Unfortunately, the hydrocarbons with the
lowest density are the most flammable; for
this reason, kerosene, in spite of its high
density, is often used.

The logistic and safety problems involved
with gasoline flotation are quite complex.
The U.S. Navy’s TRIESTE II carries 75,000
gallons of aviation gasoline (0.76 gm/cm?) in
its float. The bathyscaph is first launched
from its support ship and then filled with
gasoline when clear, the entire process ac-
counting for some 15 to 20 hours. To return
to its support ship, the float is pumped dry of
almost all gasoline and the pressure in the
float is maintained by introducing gaseous
nitrogen, which also serves to purge the float
of fumes. When TRIESTE IT is within its
support ship (ARD) the additional 1,000 to
2,000 gallons of gasoline remaining in the

float is drained through valves at the float
bottom. The recovery procedure takes about
the same time as launching. Some 300,000
gallons of gasoline are carried aboard the
ARD, and at 19¢/gallon , the cost is not
insignificant. Some savings are realized,
however, because the unused gasoline can be
turned back in and used for its original pur-
pose.

Controlling buoyancy when using gasoline
is a fulltime job. As the bathyscaph de-
scends, the gasoline loses some buoyancy
because it is more compressible than seawa-
ter and the ambient temperature causes it to
cool. Consequently, the operator is required
to drop shot ballast to compensate for the
loss of positive buoyancy. On ascent, the
reverse occurs and the operator is required
to vent off gasoline to maintain a steady,

controllable rate of ascent. Piccard (9) de-
scribed in detail the complications involved
with gasoline as a buoyant source. The con-
clusion is easily reached that syntactic foam,
in spite of its present high cost, is an ideal
replacement for gasoline.

TRIM SYSTEMS

The ability to change a submersible’s up or
down bow angle solves two general opera-
tional problems: 1) Instruments or equip-
ment may be installed that cause the vehicle
to be heavy in the bow or stern; this can be
corrected by adding or subtracting weight or
displacement at the opposite end, and 2) if a
submersible is required to follow an upward
or downward sloping bottom, its bow angle
may be changed statically so that the vehicle
“flies” parallel to the bottom. More special-

Fig. 6.8 ALUMINAUT's crew loading shot ballast at Roosevelt Roads, Puerto Rico. (NAVOCEANO)

301

ized use of a trim (and roll) capability is
found with the DSRV’s where a stricken sub-
marine may lay on the bottom at an angle
requiring the DSRV to attain both a down
angle on the bow and a starboard or port list
angle in order to mate with the submarine’s
escape hatch. A similar case may be made for
lock-out submersibles mating with underwa-
ter habitats at other than a level attitude.

The methods used to gain trim in submers-
ibles range from very simple to complex but
they all involve one of two procedures: 1) The
transferring of weight from one part of the
vehicle to the other; or 2) the taking aboard
or releasing weight at one location on the
submersible or another. The transfer of
weight, in the case of cylindrical, pressure-
hulled vehicles, need be nothing more com-
plicated than a passenger walking fore or aft
to produce an angle on the bow. In ALUMI-
NAUT, if one of the crew desired to walk fore
or aft, while the vehicle was underway, his
movement had to be countered with a con-
current movement of another member from
the opposite end to take his place. If this
procedure was not followed, the vehicle’s
trim was substantially affected. The spheri-
cal-hulled DS-4000 (BG—3 in.) experienced
the same effect if the aft crew member
leaned forward to join the operator and sci-
entist at the viewports. The “tenderness” of
submersibles toward such trim changes re-
sides in the small longitudinal metacentric
height (Table 6.7) which makes the vehicle
vulnerable to quite small weight shifts. BEN
FRANKLIN is an exception to such vulnera-
bility. During the Gulf Stream Drift, the six
crew members ran fore and aft together in
an attempt to produce instability and could
do no more than produce a dive angle of 10
degrees from which the submersible immedi-
ately recovered although the crew remained
in the bow.

While many submersibles do not have a
trim system per se, the manual placing of
lead or iron weights fore and aft during the
dive can, to a degree, produce the desired
results. On a mission off Vieques Island,
Puerto Rico, in 1968, ALUMINAUT was able
to parallel a 30-degree sloping bottom by the
crew transferring ballast weights from for-
ward to aft. Such procedures are generally

302

impractical in the single, spherical pressure
hulled submersibles as sufficient moment
cannot be gained in the small sphere, and
payload, which the lead takes up, is at a
premium.

Trim systems may be located external to
the pressure hull or within it (Table 6.7).
Several factors affect the locating decision,
the most significant being limited internal
volume and effective moment. Submersibles
incorporating internal trim systems are
those with cylindrical pressure hulls where a
large moment arm can be attained and inter-
nal volume is available. Systems external to
the pressure hull are generally found in
spherical-hulled vehicles. The following is a
description of each type of trim system from
a selected vehicle in the groups shown in
Table 6.7.

Internal Trim Systems

Water Transfer Systems:

The submersible BEN FRANKLIN has one
trim tank forward and one tank aft inside
the bottom of the end closures at each end of
the pressure hull (Fig. 6.9). Each tank has a
capacity of 50 ft® (3,100 lb of fresh water), and
the base of each is formed by the inside
contour of the hull. Steel plate sections are
welded to form the upper surface of the trim
tanks. A vertical wall at the aft end of the
forward tank and forward of the aft tank is
made of one 3-mm steel plate welded flush to
the interior edge of the hull stiffeners; in
this wall is an inspection manhole.

Enough water to fill one tank completely is
carried during a mission and is sufficient to
produce approximately a 10-degree up/down
bow angle.

The forward trim tank has a filling hole in
the top, closed by a threaded plug. Both
tanks are linked by a polyethylene pipe
joined to metal tubes located on the top of
each trim tank. Each metal tube has a valve
for air release.

When water is pumped from either tank it
vents through the overhead pipe into the
opposite tank, and moves through two poly-
ethylene pipes, running fore and aft down
the port side of the boat, which are con-
nected to trim pumps.

The trim pumps—JABSCO Model 10490,
ball-bearing, self-priming pumps—are
mounted on brackets bolted to blocks welded
to the hull. The pumps are turned by electric
motors and controlled at the pilot’s station.
Each pump operates in one direction only.

They are connected to the 110-VDC bus and
run at 1,750 rpm (2 hp) with a capacity of 84
gal/min.

The forward trim tank has a manometer
connection for reading the percentage of
water. The gage is located at the pilot’s

TABLE 6.7 SUBMERSIBLE TRIM SYSTEMS

Internal External
Metacentric Weight Bow Mechanical VBT MBT Shot
Height Shift Angle H90 Weight Mercury Diff. Diff. Diff. Battery H90 Oil
Submersible (in.) (Ib) (+ degrees) Transfer Shift Transfer Fill Fill Fill Shift Transfer Transfer

ALUMINAUT 9.7 300 30 e
AUGUSTE PICCARD 8.4 4020 NA e
BEN FRANKLIN 10.3 3100 10 e
SHINKAI 7.2 e
PC-3B e
YOMIURI ®
HAKUYO 6.0 10 e
PC5C e
TOURS 64/66 e
ALVIN 540 25 °
DEEP QUEST 3.0 1400 30 e
DS-2000 1250 30 e
DS-4000 3.0 225 30 e
DS-20000 630 30 e
DSRV-1&2 1428 45 e
SEA CLIFF/TURTLE 3.6 620 30 e
SP-350 e
SP-500 e
SP-3000 e
STAR III 2.7 270 15 e
AQUARIUS | ®
DEEP DIVER 730 e
DEEP VIEW 2.4 e
KUROSHIO II e
PAULO! e
PC-3A 1&2 e
MAKAKAI 12.0 400 e
SHELF DIVER e
SURVEY-SUB 1 e
VOL-L1 e
BENTHOS V e
SEA OTTER e
GUPPY e
MERMAID 20 e
NEREID 330 4800 30 ©
PISCES | 3.0 15 e
SDL-1 30 e
BEAVER 3.6 1474 27 °
DOWB 5.0 2.5 e
PISCES II, III, 1V, V 3.0 e

303

TRIM PUMP

VENT LINE

TRIM PUMP TRIM TANK

Fig. 6.9 BEN FRANKLIN’s trim system.

console and connected by tubing to the tank.
A small plunger next to the gage is pulled
out to let air into a cylinder. The plunger is
then pushed in, forcing air into the manome-
ter and bottom of the trim tank. The amount
of back pressure forced into the manometer
depends on how deep the water level is in the
tank.

Mechanical Weight Shift:

The simplest of all trim systems is dis-
played by submersibles which merely shift a
cast iron or lead weight fore and aft inside
the pressure hull. The Japanese HAKUYO
has adopted a lead weight moving system
which is described as the simplest, safest and
most accurate method of trim control (10).
The system (Fig. 6.10) consists of a lead
weight moved along a rail by means of a
hydraulic motor controlled by solenoid
valves. The trim may be changed +10 de-
grees.

External Trim Systems

Mercury Transfer:

To achieve relatively large trim angles,
several vehicles employ a fore and aft weight
shift in the form of mercury; ALVIN is one.
According to Mavor et al. (5), available space
on ALVIN precluded the shifting of items
such as batteries for trim purposes, and fluid
was required for flexibility in geometric
shape. Several fluids were analyzed for their
suitability. Some of the less dense fluids

304

would have added less to the gross weight of
the vehicle, but the space problem was so
critical that a fluid with a density approach-
ing mercury was required.

Mercury, however, is a difficult fluid to use
and has a corrosive effect on many metals.
This problem was solved by using a hydro-
carbon fluid in the pumping system. The
fluid in the system thus became half mer-
cury and half oil. The two fluids were found
to separate adequately if a settling stand-
pipe was provided for this purpose—oil on
top, mercury on the bottom.

The fluid is contained in three small fiber-
glass spheres, two forward and one aft. An
electrically driven pump is utilized to trans-
fer the mercury by displacing the oil in the
closed system. Two blocking valves and a
reversing valve are incorporated in the cir-
cuit to control fluid displacement. The valves
are electrically operated by solenoids. The
valves and pump motor are wired to a single
control for convenient operation. Filters and
relief valves are used for system protection
in the conventional manner.

Angles of approximately +25 degrees are
achieved by transferring 540 pounds of mer-
cury with the system as shown in Figure
6.11.

VBT Differential Fill:

The DEEP DIVER trim system can change
trim or overall buoyancy by using a seawater
medium which functions all the way from the

—=—_~ TRIM

Ty) WEIGHT

Fig. 6.10 HAKUYO's mechancial weight trim system

surface to DEEP DIVER’s maximum operat-
ing depth. The system consists of an electric
motor, pump, selector valves and fore and aft
tanks. It is designed to pump water to or

4-WAY
SOLENOID
VALVE

AFT TANK

SOLENOID
VALVE

EXPLOSIVE
DUMP VALVE

EXPLOSIVE
DUMP VALVE

OR FILL

SOLENOID
VALVE

EXPLOSIVE
DUMP VALVE

O
MERCURY DRAIN

from the sea as well as transfer water fore
and aft.

The trim tank in the pilot’s compartment is
split into six sections. The diver’s compart-
ment trim tank is split into two sections.
Under normal submarine operations both
fore and aft tanks are used to maintain trim.
During lock-out dives the aft trim tank pro-
vides negative buoyancy to partially compen-
sate for the weight of the departing divers.

The trim tanks located in the diver’s com-
partment can be flooded through the com-
partment vent valve or blown dry in 1 min-
ute through the same valve by increasing
compartment pressure 5 psi over ambient.

The trim pump is a positive displacement
piston type capable of delivering 4 gallons

OIL FILL &
BLEED

OIL
RESERVOIR

FILTER

RELIEF
VALVE, 200 psi

Oo MERCURY FILL
FORWARD

EXPLOSIVE
DUMP VALVE

Fig. 6.11 Mercury trim system of ALVIN. [From Ref. (5)]

per minute against a head of 700 psi. A 3-hp,
shunt-wound, 120-VDC motor drives the
pump.

The trim tanks, constructed to fit the hull’s
inside contour, have a total capacity of 356
pounds in the forward tanks and 375 pounds
in the aft tanks.

The system is designed for working pres-
sure of 700 psi and is protected by the use of
a relief valve. A strainer is located at the
pump inlet to remove suspended matter from
the seawater or the system to protect the
pump from damage.

MBT Differential Fill:

Two vehicles, SEA OTTER and BENTHOS
V, attain trim by differentially filling their
MBT’s. The system is operationally similar
to differential filling of the VBT’s as de-
scribed above. When partially full the MBT’s,
which are not pressure-resistant tanks, must
be pressure compensated; in the case of SEA
OTTER, internal pressurization is accom-
plished by high pressure air.

Shot Hopper Differential Fill:

Vehicles that include fore and aft iron shot
containers for jettisonable ballast have the
option of differentially dropping shot to at-
tain a variety of up or down bow angles.
However, the general operational procedure
is to drop shot equally from both hoppers to
retain horizontal trim. Only one submersible,
the tethered GUPPY, operationally employs
its droppable shot to attain trim (11).

Shot ballast in GUPPY is provided in a
single cannister on the fore-and-aft axis of
the sphere and forward of the sphere center.
Shot can be released from inside the sphere
by manipulating the shot valve. The location
of the shot ballast is such that by dropping
shot, the vessel’s trim can be corrected after
picking up bottom samples or other material
while submerged and carrying them at the
forward part of the vehicle. The total capac-
ity of shot ballast is 175 pounds.

Since the single-shot hopper provides the
only ballast affecting trim that can be re-
leased under water, the vehicle will go down
by the stern when shot is released. Trimming
or heeling in other directions while sub-
merged can only be done by moving weights
inside the pressure hull.

306

Battery Shift:

Similar in operation and effect to the inter-
nal weight-shift trim system described
above, several vehicles employ a trim system
composed of movable batteries. The MER-
MAID-class vehicle is typical.

To compensate for changes in weight dis-
tribution in the longitudinal direction—
which could occur either when equipment is
moved or when the operator moves forward
from his seat to a lying position—MERMAID
is equipped with a battery shifting system.

When the central hydraulic power supply
is working, trimming is affected via the hy-
draulic network and is hand controlled. The
system permits the longitudinal inclination
to be adjusted approximately +20 degrees.

The U.S. Navy’s MAKAKAIT also employs a
battery-shift trim system, but it is used only
on the surface to attain gross trim before the
dive and cannot be adjusted again until the
vehicle surfaces.

Ballast Weight Drop:

The submersible DEEP VIEW, in addition
to internal movable ballast, has twenty 5-
pound steel plates attached to its keel for-
ward and aft. By individually dropping a fore
or aft weight the vehicle can attain up/down
bow angles. Because the application of this
system results in an overall loss of negative
buoyancy, 16 buoyancy blocks weighing 3
pounds each are located atop the hull. They
are individually jettisonable and may be re-
leased to counteract any undesired gain in
positive buoyancy attained through use of
the trim system.

Water Transfer:

Similar in effect to fore/aft water transfer
within the pressure hull, BEAVER’s external
system consists of three spherical titanium
tanks, one mounted aft (1,238-lb capacity)
and two mounted port/starboard amidships
of 943-pound capacity each (Fig. 6.12). A hy-
draulically driven pump transfers water be-
tween these tanks at 200 pounds/minute to
gain +27-degree up/down bow angles. This
same system can also transfer seawater be-
tween the port/starboard tanks to attain list
or roll angles of +12 degrees.

VARIABLE
BALLAST
PUMP

TRIM (AND V BT) MAIN
TANKS BALLAST

Fig. 6.12 Trim system components of BEAVER (top view).

Oil Transfer:

The trim system of DOWB is not so much a
transfer of weight function as it is a displace-
ment function. It consists of a central trim
tank within the pressure hull, a fore and aft
trim bladder and a hydraulic trim pump with
associated valves, piping and fittings (Fig.
6.13). By transferring oil between the blad-

AFT
TRIM
BLADDER

ders, to decrease or increase fore and aft
displacement, an up/down bow angle of 2.5
degrees can be obtained.

With such ballast and trim systems at his
disposal, the operator of a submersible at-
tempts to carry out his mission. Some mis-
sions, however, provide options to frequent
adjustments in ballast or trim. When a vehi-

PRESSURE HULL

FWD
TRIM
BLADDER

HYDRAULIC
TRIM PUMP

Fig. 6.13 Trim system components of DOWB (starboard side view).

cle is required to traverse or search the
bottom over a large area, the pilot may elect
to use some of these options; ALUMINAUT is
an example. In its early operations, ALUMI-
NAUT was fitted with three water-filled air-
craft wheels enabling the vehicle literally to
“taxi” along the bottom by first attaining
very slight negative buoyancy and then pro-
pelling itself along with the wheels in con-
tact with the sea floor. The procedure freed
the pilot of making frequent trim or ballast
changes as the bottom topography varied or
as the crew moved about. The wheels were
later replaced by iron skids which served the
same purpose and were less troublesome.
Obviously, this procedure can be applied only
where the bottom is sufficiently smooth. One
disadvantage to this procedure is that a sedi-
ment cloud, caused by disturbing the bottom,
follows the submersible, and, if the current is
following also, valuable bottom time is ex-
pended while waiting for the visibility-ob-
securing cloud to drift off or settle out of the
water.

REFERENCES

1. Rechnitzer, A. B. and Gorman, F. T. 1969
Submersibles. in Handbook of Ocean
and Underwater Engineering, McGraw-
Hill Book Co., New York, p. 9-63 thru 9-
80.

2. Vincent, M. and Stavovy, A. B. 1963 The
promising aspects of deep-sea vehicles.
Paper No. 3 presented at the Annual
Meeting of the Society of Naval Archi-
tects and Marine Engineers, 14-15 Nov.
1963, 16 pp.

3. Covey, C. W. 1964 ALUMINAUT. Under-
sea Tech., v. 5, n. 9, p. 16-23.

308

10.

IU,

. Talkington, H. R. and Murphy, D. W.

1972 Transparent Hull Submersibles
and the MAKAKAT. Naval Undersea Re-
search and Development Center, Report
TP=283:

. Mavor, J. W., Frochlich, H. E., Marquet,

W. M. and Rainnie, W. O. 1966 ALVIN,
6000-ft. submergence research vehicle.
Paper presented at the Annual Meeting,
New York, N.Y., Nov. 10-11, 1966 of the
Society of Naval Architects and Marine
Engineers, n. 3, 32 pp.

. Rockwell, P. K., Elliott, R. E. and Snoey,

M. R. 1971 NEMO, A New Concept in
Submersibles. NCEL TR-749, 68 pp.

. Rosenberg, M. A. 1970 Buoyancy mate-

rials for deep submergence applica-
tions. Oceanology International, Mar.
1970, p. 30-32.

. Dudt, P., Tinley, T. and Weishanr, F. 19738

Lower-cost 34-LB Syntactic Foam for
20,000 ft. Depth Applications. NSRDC
Interim Report No. 1, SD Tech. Note SD-
172-163, Bethesda, Md., 19 pp.

. Piccard, A. 1956 Earth, Sky and Sea.

Oxford University Press, New York, 192

pp.

Araki, A. 1972 The operation by the
HAKUYO. Reprints from the Second In-
ternational Ocean Development Confer-
ence, Tokyo, Japan, 1972, v. 1, p. 821-828.
Watson, W. 1971 The design, construc-
tion, testing and operation of a deep-
diving submersible for ocean floor ex-
ploration. Paper presented in the Trans-
actions of the Annual Meeting of the
Society of Naval Architects and Marine
Engineers, Nov. 11-12, New York, p. 405-
433.

POWER AND ITS DISTRIBUTION

Four types of power are used to perform
work in manned submersibles: Electric,
pneumatic, muscular and hydrostatic. Other
forces also assist the vehicle through its
mission, e.g., gravity and buoyancy, but the
discussion of these is beyond the scope of this
chapter.

Electric power is the workhorse of the sub-
mersible fleet and batteries constitute the
most commonly used on-board electrical
source. Consequently, the major topic of this
chapter is batteries and the transfer of their
power to components and systems of a sub-
mersible. Pneumatic power, in the form of
compressed air, is used primarily to empty
ballast tanks of seawater; other uses are in
pressure compensation systems and lock-out

309

chambers. Human muscle power is a signifi-
cant source in shallow diving submersibles
but less so in deeper vehicles. Hydrostatic
power is used in the operation of pressure
depth gages (Chapter 10) and in the pressure
compensation of batteries and other compo-
nents; its application is discussed under
Pressure Compensation of batteries.

MANUAL POWER

According to Cohn and Wetch (1), an aver-
age man can generate 50 to 100 watts of
power for several hours before he is ex-
hausted; this averages to 1 watt-hour/pound,
and defines man as a low energy source. In
spite of his shortcomings, with the help of

mechanical advantages he supplies the
power required for many critical vehicle
functions. In small, shallow vehicles man-
power supplies many needs which can be
grouped under such functions as push, pull,
twist, turn and crank. In some vehicles, the
application of manpower is direct and in-
volves the following:

—Orientation of propulsion motors (All

Ocean Industries),
—Control of dive planes and rudders (PC-

3A),

—Dropping of emergency weights (PISCES
IT),

—Water deballasting with hand pump
(NAUTILETTE),

—Control of manipulator (VEKTON, SEA
OTTER), and

—Water sampling with hand pump (BEN
FRANKLIN).

In the majority of deep vehicles, these func-
tions are accomplished by pushing a button
which activates a pump or motor to perform
the same task, but electricity is always in
short supply and wherever the opportunity
exists to use a mechanical rather than elec-
trical component the designer will do so.
There are limits, however, to the practical
and physical aspects of transferring manual
power through a pressure hull by means of a
shaft and stuffing box. At 1,000 feet, vir-
tually all manually-operated external compo-
nents or systems are replaced by electric or
electro-hydraulic mechanisms, the only nota-
ble exception being the mechanical dropping
of emergency weights. In a few vehicles, SEA
OTTER and the PISCES series, movement of
a simple manipulator and jettisoning of var-
ious components is accomplished by man-
ually pumping fluid through the hull to at-
tain the desired reaction hydraulically.

PNEUMATIC POWER

The section ‘‘Deballasting and Compressed
Air’ in Chapter 6 discusses the characteris-
tics of compressed air as a power source in
submersibles. It will suffice at this point to
reiterate that in a great number of the shal-
low diving vehicles compressed air is used
exclusively as the primary power source to
force seawater out of main ballast tanks on

310

the surface and from both main and variable
ballast tanks when submerged.

ELECTRIC POWER

Electric power in submersibles is much like
the weather; everybody talks about it, but
nobody does much about it. Table 7.1 shows
the kinds of electric power sources in 100
submersibles; 86 of these use lead-acid bat-
teries, 1 uses a nuclear reactor, 2 derive their
power from the surface, and the remaining
vehicles use nickel-cadmium or silver-zine
batteries. On the other hand, the published
literature on energy sources for undersea
work abounds with accounts of the potential
fuel cell applications. Yet, all submersibles
constructed in the seventies and now under
construction specify lead-acid batteries.

This literature imbalance is found in many
other areas, e.g., pressure hull materials and
ballasting devices. The authors concentrate
on the future, rather than the present. For
example, as pointed out above, batteries con-
stitute the major power source for all but 3
out of 100 submersibles, and lead-acid batter-
ies dominate. Yet few can be found which
deal with means of improving the output or
construction of lead-acid batteries for this
type application. There is also a complete
absence of reports detailing the means used
to distribute this power and their successes
or failures. Bits and pieces of advice can be
found in a few papers, but a major work on
this aspect (lead-acid batteries and power
distribution) of submersibles is lacking. As a
result, the private builder is left to his own
devices in designing electrical circuitry and
selecting reliable components. It is not sur-
prising, therefore, that historically and cur-
rently, electrical malfunctions turn out to be
the most common cause of aborted submers-
ible dives.

In a 1970 presentation at the Offshore
Technology Conference in Houston, Texas, J.
F. Rynewicz (2) made the following state-
ment regarding Lockheed’s DEEP QUEST
and the submersible field at large:

“Electrical problems, especially
leakage in electrical cables, connec-
tors, and circuit breakers, constitute
the major area of need for improve-

TABLE 7.1 SUBMERSIBLE POWER SOURCE CHARACTERISTICS

Total
Main Pressure Inside DC Power
Power Type Pressure Resistant Pressure Voltage Capacity
Submersible Source Battery Compensated Capsule Hull Output (kWh) Other
All Ocean Industries B L-A No Yes Yes 12 NA
ALUMINAUT B S-Z No Yes Yes 28, 115, 230 300
ALVIN B L-A Yes - - 30, 60 40.5
AQUARIUS | B L-A No Yes No
ARCHIMEDE B N-C Yes a = 24,110 100
diesel sur-
ARGY RONETE B L-A Yes ~ - NA 1,200 face power
ASHERAH B L-A Yes - - 21.6
6,12
AUGUSTE PICCARD B L-A No No Yes 110, 220 625
BEAVER B L-A Yes ~ ~ 28, 64, 120 55
inverters for
BEN FRANKLIN B L-A Yes - - 28,112, 168 756 AC power
BENTHOS V B N-C No No Yes NA NA
24,36
DEEP DIVER B L-A No Yes No 120, 240 23
DEEP JEEP B L-A Yes - - NA 7
inverter for
DEEP QUEST B L-A Yes - - 28,120 230 AC power
DEEPSTAR 2000 B L-A Yes - - 28, 120 26.5
inverter for
DEEPSTAR 4000 B L-A Yes - - 49.6 AC power
DEEPSTAR 20000 B S-Z Yes - - 28, 112 NA
DEEP VIEW B L-A Yes ~ - 12,24, 48 16
DOSTAL & HAIR B L-A Yes - - NA 16.2
120 inverted inverters for
DOWB B L-A Yes — - dive Ex to AC 40 AC power
inverter for
DSRV-1&2 B $-Z Yes - - 112 58 AC power
FNRS-2 B L-A Yes - - NA
L-A Yes - =
FNRS-3 B S-Z No No Yes NA 30
gasoline engine
GOLDFISH B L-A No No Yes NA NA for surface
GUPPY Surface 440
Generator - - - - 110 - tethered
HAKUYO B L-A No Yes No 24,120 14.4
HIKINO B L-A No No Yes 18, 24 2.3
JOHNSON SEA LINK B L-A No Yes No NA 32
KUMUKAHI B L-A Yes - - 12 5.1 data incomplete
KUROSHIO II Surface
Generator - - - - 104 - tethered
MAKAKAI B L-A Yes - - 6, 30, 120 36
MERMAID | B L-A No Yes No 36
B = Battery L-A = Lead-Acid N-C = Nickel-Cadmium _— S-Z = Silver-Zinc NA = Data Not Available

311

TABLE 7.1 SUBMERSIBLE POWER SOURCE CHARACTERISTICS (Cont.)

Main

Power

Submersible Source
MINI DIVER B
NAUTILETTE B
NEKTON A, B, C B
NEMO B
NEREID 330 & 700 B

NR-1 Nuclear

Reactor
PAULO | B
PC3-X B
PC-3A (1 & 2) B
PC5C B
PC-3B B
PS-2 B
PISCES | B
PISCES II, Ill, 1V,V B
SDL-1 B
SEA CLIFF & TURTLE B
SEA OTTER B
SEA RANGER B
SEA-RAY B
SHELF DIVER B
SHINKAI B
SNOOPER B
SP-350 B
SP-500 B
SP-3000 B
SPORTSMAN 300 B
SPORTSMAN 600 B
STAR | B
STAR Il B
STAR III B
SUBMANAUT (Helle) B
SUBMANAUT (Martine) B
SUBMARAY B
SURV B
SURVEY SUB 1 B

B = Battery L-A = Lead-Acid

Type
Battery

L-A
L-A
L-A
L-A
L-A

L-A
L-A

L-A
L-A

L-A
L-A

Total
Pressure Inside DC Power
Pressure Resistant Pressure Voltage Capacity
Compensated Capsule Hull Output (kWh) Other
NA NA NA NA NA
No Yes Yes 24 4.4
No No Yes 24,48 4.5
Yes - - 24, 120 15
No Yes No 24, 220 40
- - - NA NA
No Yes Yes 6,12, 24 5.2
No Yes Yes NA 11
No Yes Yes NA 5
No Yes No 12, 120 16
No Yes No NA 26
No Yes No 24,120 17
Yes - ~ 66
Yes - - 70
12,28 inverter for
Yes - - 60, 120 68 AC power
Yes - - 30, 60 45
No Yes Yes 13.8
No Yes No NA 43.5
No Yes Yes NA 15
No Yes No NA 37
inverter for
Yes - - NA 200 AC power
Yes - - NA 9.7
Yes - = NA 13
Yes - = NA 6.8
inverter for
Yes = ~ 120,26 47 AC power
No Yes Yes 4.2
Yes - - 12, 24 4.7
inverter for
Yes = - 42,24,115 14.8 AC power
inverter for
Yes - - +12, 24,115 30 AC power
No Yes Yes NA 3.5
diesel engine
No Yes No 24, 115, 230 91 for surface
No Yes Yes NA 4.5
inverter for
No Yes No = 12 AC power
No Yes No 24,120 49.9
S-Z = Silver-Zinc

N-C = Nickel-Cadmium

312

TABLE 7.1 SUBMERSIBLE POWER SOURCE CHARACTERISTICS (Cont.)

Total
Main Pressure Inside DC Power
Power Type Pressure Resistant Pressure Voltage Capacity
Submersible Source Battery Compensated Capsule Hull Output (kWh) Other
TECHDIVER B L-A No Yes Yes NA 10
diesel engine
TOURS 64 & 66 B L-A No Yes Yes NA for surface
TRIESTE II B L-A Yes - ~ NA 145
TRIESTE III B S-Z No Yes Yes NA 145
VAST MK II (K-250) B L-A No Yes Yes NA B25
VOL-L1 B L-A No Yes No 24, 120 52
diesel for
YOMIURI B L-A No Yes Yes NA 45 surface power
B = Battery L-A = Lead-Acid N-C = Nickel-Cadmium — S-Z = Silver-Zinc

ment in deep submergence compo-
nents. The time, energy and dollars
lost due to the malfunction of a com-
ponent are most certainly always sev-
eral orders of magnitude greater than
the original cost of the component.
The lesson herein is that submersible
designers must insist on the use of
materials and combinations of mate-
rials that will provide high reliability
for many years in the ocean’s hostile,
corrosive depths.”

In the 4 years since Rynewicz’s statement,
there has been some decrease in the “electri-
cal problem.” Rather than a concerted effort
on the part of submersible builders to single-
mindedly find reliable materials and compo-
nents, the problem has been tackled individ-
ually, e.g., by operators, and through the
process of elimination suitable answers have
been found in some cases, and ‘‘some times”
answers in others.

In one instance, the builder (International
Hydrodynamics Ltd.) went to the extreme
measure of abandoning all commercially-
available connectors and now manufactures
its own.

Application

The only task submersibles could accom-
plish without electricity would be to descend
and ascend, and this would be done in total

313

darkness and incommunicado. To say electri-
cal power is critical is a gross understate-
ment; it is the lifeblood of undersea work as
the following indicates:

Propulsion: All submersibles use electrically-
powered motors for lateral or vertical ma-
neuvering.

Life Support: All submersibles but one, BEN
FRANKLIN, use electrically-powered carbon
dioxide scrubbers.

Communications: All two-way sub-to-surface
communication devices are electrically pow-
ered.

Illumination: All internal and external light-
ing is electrically powered.

Work and Operating Instruments: Virtually all
scientific and engineering instruments, as
well as those used to control and operate the
vehicle, are driven by electricity.

Ballast Drop: The majority of vehicles depend
upon an electrical impulse or signal to acti-
vate weight drops or jettison instruments.

Maneuvering: The majority of vehicles de-
pend upon electricity to orient their propul-
sion devices or dive planes and rudders.

Sensors: Virtually all status sensors (trim
tank level indicators, MBT and VBT level
sensors, etc.) are electrically powered.

Emergency Indicators: All seawater leak indi-
cators depend upon the initiation or termina-
tion of electrical current.

Tracking/Navigation: All routine tracking and
navigation systems depend upon electricity.

Hydraulics: Virtually all hydraulically-pow-
ered devices require electricity to pump hy-
draulie fluid.

There are exceptions to the above, but
they only accentuate the widespread and
essential role electricity plays in deep sub-
mergence, generally, and manned submers-
ibles, specifically. It is not surprising, then,
that the recent literature on submersibles
contains an inordinate amount of discussion
regarding electrical power and the means to
increase its output and endurance. It is in-
teresting to observe that the majority of
early literature on submersible design dealt
with pressure hull materials and later with
power sources. Apparently the first order of
business was to dive safely; the next item
was to accomplish something once safety was
attained.

Terminology and General
Considerations

The only general statement which may be
made regarding power supply and distribu-
tion in submersibles is that they most often
use lead-acid batteries which are usually re-
charged from a surface support ship after
each dive. While approaches to electrical
power distribution vary widely, system re-
quirements are similar, and it is around such
requirements that basic submersible electri-
cal terminology is defined.

In many respects, electric power genera-
tion and distribution aboard a submersible is
similar to that aboard a surface ship, but the
problems are compounded in a submersible
by the operating environment: High pres-
sure, low temperature and an operating me-
dium which itself is an excellent electrical
conductor, namely seawater. The character-
istics of the operating environment and the
constraints imposed by occupant safety com-
bine to make problems of electric power gen-
eration and distribution in submersibles and
submarines quite unique. A basic definition
of terms follows, while Figure 7.1 presents a
graphical representation of the components
cited:

Power Generation: This requirement is met
primarily by Secondary Batteries consisting of
lead-acid (Pb-acid), nickel-ecadmium (Ni-Cd)
or silver-zine (Ag-Zn) cells which are re-
chargeable to their rated capacity (measured

in ampere-hours) for many cycles. In sub-
mersibles the Pb-acid batteries are conven-
tional and similar to automobile batteries.

Power Distribution: Connectors and cables are
used to carry the power from the batteries.
Cables provide a waterproof, insulated cas-
ing for the current-carrying conductor(s),
and connectors are devices, generally
molded to either end of a cable, consisting of
a plug and receptacle which provide a water-
proof attachment to the energy source or,
more commonly, to a penetrator. An electri-
cal hull penetrator is a specially designed
receptacle which permits passage of current
through the pressure hull or any other cas-
ing containing an electrical component.

Power Changers: batteries generate direct
current (DC). Many instruments and propul-
sion systems however, operate on alternat-
ing current (AC). Consequently, inverters are
used to change DC power to AC. The invert-
ers may be carried within or external to the
pressure hull. Other components or sub-sys-
tems may operate on DC voltages which are
lower than that generated by the batteries.
In this case a converter is used. Basically a
converter provides the functions of a step-
down transformer and an inverter—that is,
it lowers the voltage and changes AC to DC.
This is a more energy conserving approach
than placing a series resistor in the circuit.
In practice, then, an inverter first changes
battery DC to AC which is then acted on by
the converter to yield DC power at the re-
quired voltage.

Power Protection: Three approaches are used
in protecting batteries from seawater and
pressure: 1) pressure-compensation (Fig. 7.1)
wherein the battery is placed within a sealed
and vented case filled with a dielectric fluid
(usually oil) and connected to a compensat-
ing fluid reservoir which acts to maintain a
zero or slightly positive pressure differential
across the enclosed oil/seawater face; 2) pres-
sure-protection wherein the battery is en-
closed in a pressure-resistant pod outside the
pressure hull and maintained in a dry, 1-
atmosphere environment; 3) interior location
where the battery is placed within the pres-
sure-hull to protect it from seawater and
pressure. No provisions are made to main-

tain a constant battery temperature in sub-
mersibles, the consequences of which will be
discussed later.

Protection from the Power: Faulty conductor
protection may lead to short-circuits, while
inappropriate cable routing or shielding may
result in electromagnetic interference
(EMI). In the former situation both the hu-
man occupants and the electrical subsystems
must be protected; in the latter, only the
electrical subsystems must be protected. The
causes and results of short-circuits are le-
gion. To state the obvious, the ideal solution
is prevention through sound circuit design
and construction. Unfortunately, a perfect
solution is not always attained and devices
are required to still the rampaging current
before it can cause critical damage. Fuses
and circuit breakers provide this protection
by interrupting the circuit when it reaches
or exceeds a certain amperage level. In the
small confines of a submersible, it is not
uncommon to have high voltage cables (e.g.,

PRESSURE HULL

INTERNAL
MAIN-POWER DIST.
CIRCUIT
BREAKER

EXTERNAL
POWER CONTROL
PANEL

INTERNAL
SUB-SYSTEMS

AC POWER
DISTRIBUTION
PANEL

PENETRATOR

INVERTER
(DC —» AC)

propulsion power) immediately adjacent to
cables carrying power or signals from an
instrument. In this case the EMI from the
high voltage cable may seriously interfere
with the output on the signal cable. Shield-
ing or adequate physical separation of the
two cables prevents such interference.

Power Monitors: To ascertain the state of the
batteries, equipment inside the pressure hull
may include one or all of the following: Am-
pere Hour Meter to monitor and display the
battery current used or remaining, Voltme-
ter to read battery voltage or a Ground
Measuring System to detect ground currents
on the battery and a Megohm Meter to meas-
ure ground resistance readings on other ex-
ternal equipment. A few submersibles carry
none of these measuring/monitoring devices,
others carry one or two. Indicators may be
included in the Battery Manifold Oil Reser-
voir to indicate the level of salt water incur-
sion, or in the Battery Vent Valve to indicate
when salt water has entered the vent valve
reservoir.

ELECTRICAL

HULL MAIN POWER

DISTRIBUTION
BOX & CIRCUIT
BREAKER

OUTBOARD
CONNECTOR

POWER TO
EXTERNAL
SUB-SYSTEM

RELIEF
VALVE
FOR H,

BATTERY

COMPENSATION
ELECTROLYTE BLADDER
BATTERY CASE

HOLDING COMPENSATING
OIL

Fig. 7.1 Example of electrical power and distribution arrangements in a submersible.

Power Regeneration: The majority of submers-
ibles recharge batteries after each dive. This
is accomplished with the vehicle aboard or
alongside its support craft which carries a
battery charger. A few submersibles carry
their own diesel-electric motor to charge the
batteries while they are surfaced.

In an extremely simplified manner, such is
the genesis, distribution and control of elec-
trical power in manned submersibles. The
variations on this theme equal the number of
past, present and future vehicles. The reason
for such diversity is found in the several
factors which enter into the choice of a sub-
mersible’s power source.

In a discussion of electrical power supplies
to meet the needs of deep submersibles, Lou-
zader and Turner (3) identify the following
as considerations important in the evalua-
tion of candidate power sources:

Total Power Requirements

Weight and Volume

Operational Handling

Maintainability and Repair

Reliability

Cost

Total Power Requirements

The total power required in a submersible
depends upon the vehicle’s primary mission
and projected submerged endurance. These,
in turn, are governed by the weight and
volume available for the power package. The
major power user is propulsion. Running a
close second, and sometimes exceeding pro-
pulsion are external lighting and scientific or
work equipment requirements. Hotel load
(life support, communications, avoidance
sonar, monitoring instruments) is a con-
sumer of power which must be dealt with on
a continuing basis, and, finally, the prudent
operator will maintain some amount (25%) of
power in reserve.

An examination of Table 7.1 reveals that
the total power capacity (kWh) of submers-
ibles ranges from 2.5 to 1,200 kWh. Of the 83
vehicles for which there is information, 74
carry less than 100 kWh while the remain-
der, nine, exceed this value. Further exami-
nation shows that 61 vehicles carry 50 kWh
or less. The distribution and nature of this
power varies from vehicle-to-vehicle. Some

316

operate solely with 12 VDC (KUMUKAHD]),
while others operate with 12, 28, 60 and 120
VDC and carry an inverter to supply AC
power as well, e.g., SDL-1. There are no hard
and fast rules governing total power require-
ments or rated voltages, but once the total
power capacity is established, one can caleu-
late how much will be available for various
instrument or machinery functions and for
what mission profiles. The ideal procedure,
however, would be to determine the power
requirements through power spectrum anal-
ysis of the vehicle’s intended mission(s) and
then design the vehicle and its power system
accordingly. Many builders have followed
this latter procedure, but in several in-
stances, it would appear that a more casual
approach was taken.

An example of a power spectrum analysis
is presented in Figure 7.2 which was per-
formed by Bodey and Friedland (4) for a
small submersible on a “‘typical” mission.
First, the authors divided the overall mission
into categories (pre-dive, dive, etc.) where
the operation of various electrical devices
could be prognosticated. Then, an operating
time for each device was assumed and multi-
pled by the power it would require (time x
amps xX voltage)—based on manufacturer’s
specifications. Summing each column pro-
vided the power for each category and,
hence, the total power to complete the 6-hour
mission. It is important to note that almost
one-half of the total kWh was allocated for
reserve power. Such power analysis is una-
voidable when the owner plans to lease the
vehicle’s services to a user who desires to
operate his own electronic equipment in ad-
dition to that listed in Figure 7.2.

Weight and Volume

The small size of most submersibles places
severe restraints on the weight and size of
possible power systems. The decision to lo-
cate the system inside or external to the
pressure hull is critical in determining the
total power a vehicle will carry. If the power
system is located within the hull an increase
in propulsion power is needed because of the
added hull weight. This also decreases the
vehicle’s payload and submerged endurance
and limits the volume available for internal
instrumentation. Locating the system exter-

EQUIPMENT PREDIVE | DIVE |SEARCH|SET-UP|STAND-BY| WORK | EMERGENCY |CLIMB| DOCKING
e

MECH-ARMS
HYDRAULIC SYSTEM
WRENCH
PROPULSION
WINCH

VEHICLE LIGHTS
TV LIGHTS

GYRO COMPASS
SCANNING SONAR
TRANSCEIVER
PAN & TILT

TV

LIFE SUPPORT

POWER (kW)

PEAK LOAD

kWh/6Hr = 19.3 kWh

PEAK LOAD = 7.7 kW

AVERAGE LOAD = 2.5 kW

ENERGY AVAILABLE = 30 kWh
RESERVE = 14.7 kWh = 1—6 Hr MISSION

KILOWATTS

Fig. 7.2 Power spectrum for a typical six-hour mission. [From Ref. (4) ]

317

nal to the hull alleviates the internal volume
problem and significantly eases the weight
(or buoyancy) problem. The potential for
short circuits or other failures due to leakage
is virtually nil when the power system is
inside the hull, but the gain is partially
offset by occupant safety considerations.

Operational Handling

Recharging or turn-around time of bat-
tery-type power systems and fuel cells is an
important factor. Submersibles of the DEEP-
STAR series require 6 to 8 hours for recharg-
ing between each 4- to 6-hour dive. Vehicles
of the BEN FRANKLIN and ALUMINAUT
variety require 12 hours and longer. The
only reported experience with fuel cells (4)
indicates that very little time is required to
place new fuel and oxidant aboard the vehi-
cle. It is the practice with several vehicles
simply to replace a used battery package
with a charged one after each dive, thereby
significantly decreasing turn-around time.
This latter option assumes that the design of
the vehicle permits such modular replace-
ment. Short turn-around time is critical to
the economic utilization of a submersible
operating in areas where weather dictates
the deployment of vehicles. In the North Sea,
for example, periods of relative calm can be
quite short, and the submersible requiring 6
to 8 hours turn-around time works at a dis-
advantage.

Maintainability and Repairs

Few submersibles are furnished with an
enclosed area for repairs or maintenance
aboard their support ship. Consequently,
weather plays an important role in the time-
ly correction of malfunctions or in routine
maintenance. Where repairs to an internal
power package are required the problem re-
mains, but is less severe because the work
may be performed within the shelter of the
pressure hull and, depending upon the na-
ture of the casualty, may be performed dur-
ing the dive itself. External power systems
are limited to repairs only when the vehicle
is aboard ship or ashore. BEN FRANKLIN
and ALUMINAUT present the advantages
and disadvantages of the opposing power
system location strategies. Both vehicles are
generally towed to the operating site and

318

remain in the water during the operation
because their size and weight preclude
launch/retrieval in a routine fashion. If BEN
FRANKLIN undergoes a significant battery
malfunction, the vehicle must be towed to a
port where facilities are available to lift the
142-ton vehicle out of the water. Conversely,
ALUMINAUT, with silver-zine batteries in-
side the pressure hull, may be repaired in
the water and on site—thereby negating a
long tow and expensive lift to ascertain the
nature of the problem.

To digress for a moment, the future sub-
mersible designer should note that while AL-
UMINAUT’s internal batteries allow easier
maintenance and repair than BEN FRANK-
LIN’s external, keel-mounted, lead-acid bat-
teries, ALUMINAUT’s electrical penetrators
are below its waterline. Hence, when ALUMI-
NAUT’s penetrators fail (as was the case in a
1968 Puerto Rican operation) it must be
lifted out of the water. BEN FRANKLIN, on
the other hand, has all its electrical penetra-
tors above the waterline, thereby allowing
in-water repairs.

Reliability

There are a variety of candidate power
systems which offer considerable advantages
over lead-acid batteries, but the extreme in-
hospitality of the deep sea, and the size and
weight limitations imposed on the system by
small submersibles precludes a number of
redundant measures incorporated in most
marine designs (3). For such reasons and the
overriding need for a reliable power source,
many potentially better power systems fail
to make it through thelecompetitive selection
process.

Cost

The U.S. Navy’s NR-I receives its power
from a nuclear reactor and may remain sub-
merged and cruising for 30 days or longer.
NR-1 is acknowledged to have cost some $99
million. What portion of this value repre-
sents the power package is unknown, but is
certainly at least an order of magnitude be-
yond the budgets of present, private sub-
mersible builders. Likewise, the increased
size and weight of the vehicles needed to
accommodate nuclear reactors would impose
severe penalties on mobility and maneuvera-

bility for certain types of missions. In the
simplest example, the All Ocean Industries’
vehicle employs two 12-volt lead-acid batter-
ies inside its pressure hull; the total cost of
this power package is somewhere around
$70. Cost and reliability are so intertwined
that it is impossible to evaluate one without
the other using the present yardsticks of
evaluation. Confidence or reliability in a
power system is achieved through demon-
strated performance. For this reason the
lead-acid battery (in use since 1901 in U.S.
Navy submarines) is irresistible. For other
systems (fuel cells, thermoelectric genera-
tors and other batteries) to attain this de-
gree of confidence they must demonstrate
their reliability, but without a concentrated
research and development program which
will both demonstrate reliability and de-
crease purchase cost, it is difficult to foresee
a near-future competitor to lead-acid batter-
ies.

In the final analysis, the nature, location
and total power output of a submersible’s
power system are compromises of design and
operational trade-offs. Without compromis-
ing occupant safety, sound arguments can be
advanced for systems internal to the pres-
sure hull as well as external. Both solutions
are accompanied by disadvantages for which
there is no optimum solution in one submers-
ible. Perhaps future developments will help
to alleviate this problem, but for the present
let us examine the power sources with which
submersible builders have dealt: Batteries,
fuel cells and nuclear reactors. Though not
having a “self-contained” power source, sur-
face-powered vehicles such as GUPPY and
KUROSHIO IT satisfy all other require-
ments of a submersible; hence, aspects of
their cable-supplied power systems are
briefly described.

BATTERIES

Batteries generate power through the flow
of electrons from a negative (anode) to a
positive (cathode) electrode immersed in a
conducting (electrolyte) medium (usually a
liquid). The basic electrochemical unit (an-
ode, cathode, electrolyte) is called a cell; the
finished, boxed unit is the battery and it may
consist of one or many cells. After a period of

319

time, the flow of electrons from anode to
cathode (discharging) will weaken, and, for
further use, the electron flow must be re-
versed by recharging to bring the cell back to
its rated strength. Cells that can be re-
charged for many cycles are called second-
ary cells; cells that cannot normally be re-
charged—e.g., where the electrodes are de-
pleted—are called primary cells. Secondary
cells are the major suppliers of power in
submersibles. Primary cells are frequently
used to furnish emergency power or power to
ancillary components such as pingers or
transponders. Our main concern here is with
secondary cells or batteries, of which three
types have been used in submersibles: Lead-
acid, nickel-cadmium and silver-zine. The
classification of batteries is derived from the
substance comprising the electrodes (silver-
zine, nickel-cadmium) or from the substance
comprising the electrodes and electrolyte
(lead-acid). The electrolyte in the silver-zinc
and nickel-cadmium batteries is alkaline.

While there is a lack of reported studies
aimed at improving the performance and
packaging of secondary batteries, there are
several excellent reports detailing the char-
acteristics of these power sources in the ma-
rine environment and other analyses exist
which compare the advantages and disad-
vantages of one source against the other.
The author has relied heavily on these stud-
ies to provide a state-of-the-art summary of
the characteristics and properties of second-
ary batteries for deep submergence. A sec-
ond topic—the means used to protect these
sources from seawater and pressure—is
dealt with under Protection and Pressure
Compensation.

Characteristics

In 1968 the National Academy of Sciences
published a report (5) on energy system re-
quirements and technology for undersea ap-
plications which cited the following advan-
tages and disadvantages of conventional bat-
teries relative to other energy sources.

Advantages:

a) Basically simple construction where all
components are self-contained within
the battery.

b) Operate at ambient deep-sea pressure
and thereby conserve pressure hull
weight.

c) No moving parts preclude generation of
noise or vibration.

d) Operate at temperatures well below to
well above those encountered within the
sea.

e) Highly reliable, and failure occurs one
cell at a time such that battery opera-
tion may continue with only slightly
diminished output.

f) Available commercially in a large vari-
ety of types, sizes and configurations,
and, for the most part, developmental
costs have already been paid.

Disadvantages:

a) Energy densities (energy per unit
weight) and specific energies (energy
per unit volume) are low.

b) Designed for operation at power levels
of not more than a few tens of watts per
pound and a few kilowatts per cubic foot
(silver-zine cells are an exception).

The report concludes that, among the var-
ious conventional batteries available, silver-
zine batteries appear most attractive for un-
dersea application. It also presents a sum-
mary of secondary battery characteristics
which is shown in Table 7.2. An analysis of
Table 7.2 reveals that silver-zine cells
achieve the highest energy density (watt
hours/lb) and lead-acid the lowest with

nickel-cadmium somewhat in between. Con-
versely, initial costs are in the reverse order.
Penzias and Goodman (6) point out that
there is significant salvage value, however,
in the silver of a silver-zine cell while the
lead in a lead-acid battery is hardly worth
recovering.

Discharge Rate and Temperature

According to Cohn and Wetch (1), most
battery manufacturers define standard con-
ditions as room temperature and low dis-
charge, and Howard (7) standardizes this
condition as a 5-hour discharge at 80°F. Volt-
age profiles of various secondary cells are
shown in Figure 7.3 and clearly demonstrate
the steady output of silver-zine and nickel-
cadmium cells. Curves presented by Kisinger
(8) show that the highest energy per pound
from secondary batteries (lead-acid; silver-
zine) is obtained at slow discharge rates. In
short, to realize the most energy, batteries
should be used under load conditions which
will keep the drain on them to a minimum.
Conversely, of course, a high discharge rate
reduces the total amount of energy that can
be taken from a battery.

In general, as temperature decreases the
withdrawal of current becomes more difficult
because the increasing viscosity of the elec-
trolyte hinders the passage of reactants and
products to and from electrodes (9). High
temperatures are only a problem if they are

TABLE 7.2 SUMMARY OF SECONDARY BATTERY CHARACTERISTICS [FROM REF. (5)]

Theoret
Open Typical ical
circuit operating energy
Temp voltage voltage density
Type Anode Cathode Electrolyte F (V) (Vv) (Wh/Ib)
Conventional
Lead-acid Pb PbO, H,S0, —40-140 2.2 1.7-2.1 80-115

Nickel Cd Ni KOH —40-140 = 1.35 1.0-1.3 105
cadmium oxides
Silver-zinc Zn AgO KOH, ZnO 0-140 1.8 1.3-1.6 205

Maximum
Actual energy power
density density Opera- Typical
(W/ (W/ Cost* ting no. of
(Wh/Ib) (Wh/In.3) Ib) in.3) ($/kWh) Life cycles Remarks

5-20 0.41.2 15-30 1.2 0.09(60) 2-14yr 1500 conventional lead
storage cell; presently
used for submarines,
automobiles, etc.

12-15 0.7-1.0 iy 0.21(700) 4-6 yr 1000 available as completely
2000 sealed cell

30-80+ 18-56 170 7.2 8.40(800) 6-18mo 10-200 high capacity and very
high drain rates; low
cycle life; expensive

* First value is cost/kWh of energy drawn from battery during anticipated cycle life. Bracketed value is initial cost

320

T T T ] T
NOTE: DISCHARGE TIME IS ARBITRARILY CHOSEN. ANY
ae OF THE BATTERIES SHOWN CAN GIVE FULL DIS.
~ a CHARGE IN FROM 1TO 10HR
~& |

2 NICKEL — CADMIUM
E — eee eee
‘

At

St

1.0

CELL VOLTAGE —= VOLTS

1S ee

t
|
|
|
|
|
|
|
|

05

ES Se

°
n
we
2
a
o
©

DISCHARGE TIME —= HOURS

Fig. 7.3. Voltage profile of three secondary batteries

high enough to boil off the electrolyte, deteri-
orate the separators or distort the battery
case. In deep submersible operations, consid-
eration is generally given to low, rather than
high temperatures because the operating en-

vironment is on the low temperature side.
Normal operating temperatures of most sec-
ondary batteries are between 65° and 90°F.
While water temperatures in excess of 90°F
are quite unusual, deck temperatures in the
tropics can exceed this value and should be
considered when the submersible is out of
the water. Water temperatures as low as
30°F may be encountered in the ocean, and
deck temperatures below 0°F can be antici-
pated in the high latitudes. Performance
data from various cells are presented in Ta-
ble 7.3 and show the effects of temperature
and discharge rate. The dashes in this table
indicate the need for heaters to warm the
cells. Cohn and Wetch (1), who present an
excellent technical summary of all present
and potential undersea power sources, rec-
ommend heaters in extreme cold to assure a
more normal voltage profile throughout the
discharge, and they point out that it is possi-
ble to have a higher voltage at cut off than
at starting because of the warming of the
active surfaces during normal discharge.

TABLE 7.3 RELATIONSHIP OF TEMPERATURE, DISCHARGE RATE, AND PERFORMANCE
[FROM REF. (10)]

i

Potential at midpoint, V

Cell Rated Discharge
Capacity, Rate,

Battery Type (amp-hr) (amp) 80°F
Lead-acid 5 0.5 1.95
1.0 1.92
10.0 1.81
60 10.0 1.92
25.0 1.90
50.0 1.87
100.0 1.70
Nickel-cadmium 5 1.0 1.22
10.0 eid
75 10.0 1.23
25.0 1.20
50.0 (el)
100.0 1.17
Silver-zinc 5 0.5 1.52
1.0 1.50
10.0 1.40
60 10.0 1.52
25.0 1.49
50.0 1.48
100.0 1.42

Capacity, amp-hr, % rated

O°F —40°F 80°F 0°F —40°F
1.89 1.85 100 54 30
1.84 1.80 88 50 21
1.60 1.40 46 16 3
1.89 1.82 100 54 26
1.80 1.65 87 31 10
1.70 == 63 18 ==
—— = 39 as —
= _— 100 =- ==
1.05 1.05 94 67 21
1.16 1.14 100 80 64
1.14 1.06 97 82 48
1.07 1.00 94 72 34
— — 82 == ——
1.45 —_ 100 75 ==
1.42 == 96 70 ==
1.26 == 85 63 ==
1.46 == 100 92 ==
1.42 == 97 79 ==
1.42 == 92 75 ==
1.30 == 84 69 ==

PRESSURE
600 kg/cm?

ATMOSPHERIC (30°C)

FINAL VOLTAGE 1.0V

SYNLVH3adW3aL

oO
oO 30 60 90 120 150 180 210 240 270 300 330 360 390 420 450 480
TIME (MIN)

Fig. 7.4 Silver-zinc cell discharge characteristics under high pressure.
[From Ref. (12)]

Pressure

In 1963, Horne (9) stated that the effects of
pressure on battery performance should be
slight, and subsequent experience proved
this correct. More recently, Funao et al. (12)
performed a number of experiments on sil-
ver-zine secondary batteries. One result of
their studies is shown in Figure 7.4 and
indicates that there is no appreciable differ-
ence in capacity at atmospheric pressure
than at 600 kg/cm? (8,532 psi). The range of

fluctuation in electrolyte level due to pres-
sure was found to be larger than the range
due to discharge and the electrolyte did not
regain its original level after pressure was
removed. The authors could not explain the
phenomenon and suggest further study of
this irreversible process.

Summarizing Horne’s and others’ observa-
tions and his own, Work (11) concluded that
pressure might well be beneficial to battery
performance by: 1) Increasing the electrolyte
conductivity (5 percent in Pb-acid; 2 percent
in Ag-Zn), 2) reducing the volume of any gas
at or in a porous electrode making more
electrolyte available at the surface and effec-
tively increasing current density, and 3)
through some unknown mechanism, increas-
ing the power and providing greater watt-
hour efficiency.

Cell Life and Cycling

For all practical purposes the life of a
secondary battery begins when the electro-
lyte is introduced. At this point the battery
is said to be activated and its useful longev-
ity is termed wet life or shelf life. In sub-
mersible operations a battery is charged be-
fore and after each dive, and its usefulness

TABLE 7.4 CELL CHARACTERISTICS OF THREE BATTERY TYPES [FROM REF. (10)]

Composition,

Cell potential, V
charged state E

Time to discharge

Shelf life in charged condition

Life in operation
Without With
maintenance maintenance

Battery type Fast- Slow- Shelf life if If
Pos. Neg. Elec- Open Dis- est, Av., discharged Charge loss, Shelf charged Shelf Cycles Float
trolyte circ. charging (min) (hr) (days) (wet) % life each: life
Lead-acid... PbO, Pb 4H,S0, 2.14 2.1-146 3-5 8 >3 Not per- Low-rate: Days 30-45 Years To 500 To 14 yr
mitted 15—20%/yr Months days
Nickel-cadmium..NiO, Cd KOH 1.34 1.3-0.75 5 5 >3 Years Pocket: Months 30-45 Years 100—2,000 8-14 yr
20—40%/yr Weeks days 25—500 4-8 yr
Sintered:

Silver-zinc .. . AgQ Zn KOH 1.86 1.55-1.1 <0.5 5 >90 Years

SOURCE: F. D. Yeaple, Dry Cell Performance, Prod. Eng., 36:160 (1965).

10—15%/mo
15—20%/yr 3-12mo 6mo 1-2 yr 100-300 1-2 yr
low dis.
5-100
high dis.

to the operator is measured in terms of the
number of charge and discharge cycles it can
undergo and still be recharged to its near
rated capacity (amp-hr). High rated batteries
(delivering large current drains for periods
of several minutes to 1 hour) have a shorter
wet life and cycle life than low or medium
rated batteries (discharge at rates from 1 to
10 hours). Under atmospheric conditions the
shelf life and cycle life characteristics paral-
lel those shown in Table 7.4.

A great deal of recent battery studies con-
centrate on silver-zine cells (11, 12, 138, 14)
and provide both laboratory and field data
regarding their cyclic longevity. Again,
though lead-acid batteries have been used
for years, there are no known reports regard-
ing their cycling characteristics in the ocean.
Hence, the following data apply only to sil-
ver-zine cells.

In laboratory experiments Funao et al.
repeatedly cycled two oil-filled batteries
(placed in a “soft”? container and surrounded
by oil) to 600 kg/em? (8,532 psi) and dis-
charged them at 150 amp for 2 hours. Dis-
charge was followed by a 35-amp charge to
2.05 volts and every 10 cycles the battery
was discharged to 1.0 volt and measured. A
comparison of the data between the pressur-
ized battery and a similar battery not sub-
ject to pressure (Fig. 7.5) shows that dis-
charging under pressure delays the rate of
capacity decrease. The cause of expiration
was short circuits through the separators of
both batteries. Work (11) reached similar
conclusions after cycling identical ten-cell
250-amp-hr batteries for 2 years in simulated
deep-ocean conditions. He found the rate of
capacity loss to be the same as that of a
similar battery operation at atmospheric
pressure for the same period. Momsen and
Clerici (13) reported the results of silver-zine
cell use on the Deep Submergence Vehicle
TRIESTE IT and concluded that this type of
battery is entirely suitable so long as usage
is maximum.

Charging

Extensive testing demonstrated that
charge reception is reduced slightly when
silver-zine battery temperatures are at 32°F
or less (13). Whereas charging (and discharg-
ing) are heat generating processes, the low

CAPACITY (hr)

323

heat transfer coefficient for the cells tends to
keep them warm. Work (14) discussed heat
transfer within batteries and pointed out
that a number of cells packed tightly to-
gether can dissipate little heat. Rapid cy-
cling causes the temperature of the center
cells to rise appreciably above that of the
outside cells and results in an unbalanced
condition. To rebalance the batteries two
approaches are taken: 1) The entire battery
is charged and then floated at a low rate for
a few days, or 2) individual cells are charged
or discharged at a low rate through the
voltage monitor system harness.

Spill Angle

The normal orientation of wet cell batter-
ies is upright; most are equipped with spill-
proof devices and can withstand up to 30-
degree tilting without ill effects. Work (14)
reported that cells are under design with
angles of 45 to 60 degrees from the vertical
as a goal. The same report relates an inci-
dent where a surfaced vehicle rolled as much
as 90 degrees. A 90-degree roll is, to say the
least, quite unusual, and one might find it
more advisable to reconsider the vehicle’s
stability rather than designing batteries to
withstand roll angles of this magnitude.

DISCHARGE CURRENT 150 amp

PRESSURE
IN DISCHARGE! IN CHARGE
--x--| 600 kg/cm? | ATMOSPHERIC

—_—O— | ATMOSPHERIC [ATMosPHERIC

CHARGE CURRENT 35 amp

oO 20 40 60 80 100 120 140
LIFE CYCLE

Fig. 7.5 Life characteristics of silver-zinc cell. [From Ref. (12)]

Gassing

Hydrogen and oxygen gasses are given off
from lead-acid batteries during both charg-
ing and discharging, though the greatest
quantity emanates during charging. The
problems brought about by gassing depend
upon the packaging and location of the bat-
tery. If the battery is carried within the
pressure hull the problem concerns the di-
rect effects on occupants due to: 1) Inhala-
tion of hydrogen, 2) explosion of hydrogen or
3) inhalation of chlorine gas if the electrolyte
spills and comes in contact with seawater.
Silver-zine cells also evolve hydrogen and,
according to Work (14), a “‘hot”’ short (where
the reaction is sufficiently vigorous to boil
the electrolyte) can vaporize mercury, which
is used in small amounts in these cells, to
present another potential hazard to the oc-
cupants. Batteries located externally and
pressure compensated by oil avoid the direct
safety hazards of poisonous gasses, but in-
troduce other factors bearing on short cir-
cuits and ballasting control. The effects of
gassing on pressure-compensated batteries

will be discussed in the section on Protection
and Pressure Compensation.

An atmosphere containing as little as 4
percent hydrogen (69 in.? hydrogen/ft® air) is
explosive in the presence of a spark or flame.
Generally, concentrations greater than 2
percent are avoided for operational safety.
Hydrogen is generated in greatest amounts
during charging, and for this reason, the
charging area should be well ventilated.
Being lighter than air, the hydrogen rises
and may become trapped in any dome-like
space above the battery. Even when idle, a
lead-acid battery liberates small amounts of
hydrogen, and if in a small confined space, a
dangerous accumulation can be reached
within a few hours. Another area of hydro-
gen accumulation can be the void space
above the electrolyte within the battery. (Ac-
cording to the Hydro-Catylator Corporation,
1 amp-hr of overcharging, under normal con-
ditions, produces 25.5 in.® of hydrogen per
cell, and when idle, it can be assumed that
local action will be equivalent to an over-
charge flow of 0.1 amp for each 100 amp-hr of
cell capacity.)

Fig. 7.6 Hydrocaps on SEA OTTER'’s lead-acid batteries

Submersibles with batteries inside the
pressure hull have operated for many years
with no ill effects on the occupants; indeed,
military submariners have over a half-cen-
tury of experience in this field with no ill
effects. So, for all practical purposes, empiri-
cal data shows that accumulation of hydro-
gen during an 8- to 12-hour dive, or even
longer, does not reach quantities detrimental
to occupants. Explosions during charging are
not infrequent and represent the greatest
gassing hazards. Recently a device called a
“Hydrocap”’ has been introduced by the Hy-
dro-Catylator Corporation of Hialeah, Flor-
ida. The Hydrocap (Figs. 7.6 and 7.7) is used
in place of a conventional battery vent cap,
and it contains a palladium catalyst which
recombines the hydrogen and ambient oxy-
gen into water vapor which is condensed and
returned to the battery. Use of these caps

MONEL COVER

ie

2-3/32 SHORT NECK

2-15/32 REGULAR
\
2-27/32 LONG NECK

BASE LOCK

VAPOR SEALL

SHORT NECK
REGULAR

HYDROCAP

during charge and discharge is a significant
deterrent to hydrogen explosions and also
aids maintenance by automatically “topping
off’ the cells with the reconstituted water.
Several submersible builders have adopted
Hydrocaps (Perry Submarine Builders, In-
ternational Hydrodynamics) and find them
to be all that the manufacturer claims.

Battery Location, Protection and
Compensation

Submersible builders elect one of three
procedures to protect batteries from the rig-
ors of the deep sea: The majority (48%) place
the batteries outside the pressure hull, en-
capsulate them within a dielectric fluid and
subject them to ambient pressure; 32 percent
place the batteries inside the pressure hull;
and 20 percent enclose the batteries within a
pressure-resistant capsule external to the

PALLADIUM CATALYST

TREATED
PROTECTIVE FIBER

GLASS CONDENSER

___ ASBESTOS PAPER
LINER

ie 7

ry
I;

STEATITE CERAMIC
CATALYST HOLDER

SHORT NECK 1-11/16
REGULAR 2-1/16
LONG NECK 2-7/16

HARD RUBBER
SUPPORT

BASE

BAFFLE

NYDRO-CATYLATOR CORPORATION
3511 E 19th COURT 80% 3648
HIALEAH, FLORIDA 33013

Fig. 7.7 Design of Hydrocaps. (Hydro-Catylator Corp.)

325

pressure hull. Each approach has its own
advantages and disadvantages.

In-Hull Placement

Placing the battery within the pressure
hull reduces circuit complexity, eases main-
tenance and minimizes the possibility of the
cells coming in contact with seawater. Con-
versely, this option increases the hull weight
(and decreases payload), takes up internal
space which could be used for equipment or
personnel and presents a potential safety
hazard to occupants. The first two of these
disadvantages are fairly obvious; the safety
aspects should be explained. On a short dura-
tion dive (8-12 hr) hydrogen gas from dis-
charging batteries, as discussed previously,
is not sufficient to harm the human occu-
pants, nor should it reach a concentration
(4%) whereby explosion in the event of
sparking could occur. Indeed, employment of
Hydrocaps should negate either of these pos-
sibilities. The first area of concern lies with
spillage of the lead-acid electrolyte at high
pitch or roll angles. In this case the electro-
lyte could come in contact with the occu-
pants and cause acid burns or, even worse, it
could combine with seawater in the hull and
release toxic chlorine gas. It also could dam-
age the submersible structure and equip-
ment therein. Work (14) cautions that a vig-

OPERATOR'S
COMPARTMENT

orous short circuit can boil out the electro-
lyte in silver-zine batteries and vaporize the
mercury within them to further endanger
the occupants. Undoubtedly, the most signif-
icant hazard arises during battery charg-
ing—and this may occur regardless of bat-
tery location—where overcharging might
cause electrolyte spillage into the Hydrocap
and cause it to cease functioning. In this
case hydrogen might build up to dangerous
concentration. Anderson et al. (15) cites a
further consideration in reliance on Hydro-
caps; this resides in the possibility that in
enclosed spaces insufficient oxygen may be
present to recombine with the hydrogen. It
should be noted that their discussion relates
to the situation where batteries are carried
within an external pod, not in the pressure
hull where a far greater volume of air is
available.

Placement of the battery within the hull
has been approached in two ways: The first
is to simply install the battery securely in
some convenient spot, e.g.. SEA OTTER, All
Ocean Industries, and the second is to seal
off a portion of the hull, generally low in the
hull, and place the battery there (Fig. 7.8).
The latter procedure further protects the
occupants, and if the sealed area is also
pressure resistant it offers additional safety
advantages. The in-hull procedure has been

FORWARD
TRIM AND
VARIABLE
BALLAST

FORWARD MAIN
BALLAST TANK

AUX.
cupt, FWD.
FOOT
WELL

Fig. 7.8 In-hull battery location in the PC-3A. (Perry Submarine Builders)

326

followed for many years in military subma-
rines and for a number of years in submers-
ibles. It is inexpensive and simple to install
and maintain the batteries, and, as long as
the proper safety precautions in design and
operation are always followed, the only ma-
jor disadvantages are in degradation of pay-
load and decreased internal volume.

Pressure-Resistant Capsules

The second option to battery location is
installation within a pressure-resistant cap-
sule or pod completely independent of the
pressure hull (Fig. 7.9). This procedure,
adopted by the majority of latter-day sub-
mersible builders, was first initiated by
Perry Submarine Builders. Anderson et al.

Fig. 7.9 The battery pod of AQUARIUS |

(15) present a thorough discussion of the
genesis from in-hull placement of batteries
to the use of external pods in the Perry
submersibles; their observations and experl-
ences constitute the backbone of the follow-
ing discussion.

Installation of batteries in an external pod
offers the following advantages: Internal
pressure hull space is not required; any toxic
battery gasses which may evolve will not
affect the occupants; the pods can be made
droppable to serve as emergency deballast-
ing; maintenance and repair is made easier
by incorporating roller plates on which the
battery may be removed from the pod; the
battery tray can be made of a high dielectric
material and thereby reduce leakage resist-
ance problems; both ends of the pod can be
removed and forced air ventilation applied to
dissipate hydrogen gas generated during
charging; and for quick turn-around time
between dives the used batteries can be eas-
ily replaced with fresh ones.

Conversely, this procedure has the follow-
ing disadvantages: Total vehicle weight is
increased; the drag force of the vehicle is
increased and thereby requires increased
power for propulsion; electrical penetrations
for power are increased; and total cost of the
vehicle rises.

One problem of major concern in the Perry
vehicles is battery gassing during sub-
merged discharge (15) and the lack of suffi-
cient oxygen within the pod to recombine in
the Hydrocaps with the hydrogen generated.
To alleviate this problem the battery pod on
SHELF DIVER was pressurized prior to seal-
ing to provide adequate oxygen. To prevent
poisoning of the palladium catalyst the Hy-
drocaps in Perry vehicle pods are located in
the top of the pod such that overcharging
will not contaminate the catalyst with elec-
trolyte.

This procedure, then, offers a number of
advantages and disadvantages, the greatest
penalty being weight. Compared to the pres-
sure-compensation system, external pres-
sure-resistant pods are far less trouble and
considerably more reliable. There is a point,
however, where the added weight would be-

come prohibitive in the deeper diving vehi-
cles.

Pressure Compensation

In this arrangement the batteries are lo-
cated outside the pressure hull and within a
non-pressure-resistant container. A dielec-
tric fluid (oil) completely surrounds the cells
and provides both electrical insulation and
pressure equalization. A typical compensa-
tion system is shown in Figure 7.10. The
system conserves vehicle weight and pres-
sure hull volume, while offering no direct
safety hazards to the occupants. In some
vehicles the batteries are jettisonable to pro-
vide emergency buoyancy. On the debit side,
the present systems are messy, generally
difficult to maintain, and, according to Work,
“.. . destined to get salt water in them at
one time or another.”

Packaging batteries in this manner must
satisfy two, relatively simple requirements:
Hold the dielectric fluid in and keep sea-
water out. While the requirements are sim-

MANUAL
VENT & FILL
VALVE

RELIEF
VALVES

SALT WATER
BAFFLES

PLENUM
DRAIN

ELECTROLYTE
SCRUBBER

\

FLEX HOSE

GASKET

STAINLESS STEEL
CASE & COVER,

NEOPRENE COVERED CASEDBAIN

COMPENSATION
BLADDER

Fig. 7.10 Typical battery compensation system. [From Ref. (16)]

ple, meeting them in practice has consumed
a great deal of time and effort. Because oil is
used as the pressure compensation medium,
all other materials must be oil-compatible.
Gasses generated during the batteries’ oper-
ation must be vented off. As this gas leaves
the electrode, it carries entrained electro-
lyte, and if no provisions are made to sepa-
rate the two (gas from electrolyte), the elec-
trolyte may accumulate on top of the cells
and elsewhere to produce a host of problems.
While the gas may be held in solution at
great depths, it leaves the cell or comes out
of solution as the vehicle surfaces. These are
but a few of the problems associated with
pressure-compensation systems. A review of
the literature makes one wonder that the
system works at all. Nonetheless, it somehow
does, and the need to conserve weight and
space in deep diving vehicles has prompted a
great deal of attention to this procedure.

The approach to pressure compensation
has been on an individual basis; no two sys-
tems are precisely the same and all have
their own peculiar problems. Consequently,
the subject might best be served by concen-
trating on the experiences and research of a
few, rather than the problems of a multitude.
An appreciation for the range through which
battery compensation problems can vary
from vehicle-to-vehicle can be gained from
Figure 7.11.

The gassing behavior of lead-acid batteries
under both atmospheric and high (1,000 psi)
pressure conditions was studied in detail by
Marriott and Capotosto (17 & 18). Specifically
they delved into the chemical, physical and
electrical properties of the compensating oil
used in the STAR series of submersibles (Pri-
mol 207, a hydrocarbon oil produced by
Exxon Oil) and its compatibility with nonme-
tallic battery components. They also looked
into the entire spectrum of bubble genesis
during charge and discharge of Exide MSC-
11 batteries. The results of this study are
summarized by the authors as follows:

“The volume of gas produced by the
subject battery during discharge at
elevated pressures is not directly de-
pendent on the magnitude of the ap-
plied pressure.

The gassing behavior of the MSC-11
cell during discharge under pressure
is much more erratic than at atmos-
pheric pressure.

A decrease in the gas producing abil-
ity of the battery along with a build-up
of battery by-products occurs more
quickly at pressure than under am-
bient conditions.

Gas volumes entrapped by the battery
after discharge at pressure generally
vary from 100-155 ml. On occasion,

Fig. 7.11 Two pressure compensated systems. STAR /// (left) of 60 cells and BELL FRANKLIN (right) of 378 cells. (Gen. Dyn. Corp. and NAVOCEANO)

329

lower values (40 ml) can be obtained.
No evidence of degradation of Primol
207 dielectric fluid as a consequence
of discharging the battery at pressures
up to 1000 psi can be noted.”

In a companion paper R. S. Evans (16)
discussed the whole range of pressure com-
pensation considerations based on analyses
of the behavior of lead-acid batteries in ASH-
ERAH, STAR II and STAR III. Evans’ report
is succinct and in very few words he presents
a wealth of experience the submersible de-
signer would do well to review. Several as-
pects of batteries and pressure compensation
systems, not dealt with elsewhere in this
section, are summarized below and are taken
directly from Evans.

Vehicle Dynamics:

List, trim and attack angles and angular
rates affect such parameters as acid and oil
movement, structural fatigue and distortion.
Relative to a surface craft, a surfaced sub-
mersible is more vulnerable to sea forces
which produce bending and impact loads in
components of the pressure compensation
system and battery containers.

In a rapid emergency ascent (300 to 600
fpm) the gasses entrained or in solution
might rupture the system or accumulate to a
potentially explosive volume. Introduction of
sufficient seawater via a rupture invites cer-
tain explosion or rapid combustion of oil and
gas.

A series of relatively shallow dives and
quick ascents will cause compensating oil to
push out of the vents in front of the expand-
ing gas which is produced continuously. If
the bladder design cannot accommodate such
losses, insufficient compensation volume
may result on an ensuing deep dive with
possible leakage into or destruction of the
batteries.

Pressure:

Interior system pressure should be kept
slightly positive with respect to ambient. In
this vein Evans offers the following precau-
tions in selection of materials for sea pres-
sure service: Battery lead deforms plasti-
cally; bulk moduli of adjoining materials
should be as nearly equal as possible for in-
cell connection and wedging.

330

Biological:

Evans relates the following experience
with respect to biological considerations:

“STAR III was so busy in 1966-67
that over one year passed before the
battery box interiors were inspected.
When they were finally opened, a film
of biological material was discovered
deposited across the cell tops. The
organism was cultured and tentatively
identified as Pullularia pullulens, a
black, yeast-like mold. The system had
been anaerobic for the period, yet this
organism apparently thrived and de-
clined several times in this supposedly
hostile environment. If the ecology
were not controlled by additive inhibi-
tors or occasional flushing with anti-
septics, it is conceivable that orga-
nisms could flower under the proper
conditions and cause short circuits by
entrapping water and/or acid, or
could clog lines and valves with their
detritus. Such a case was reported by
TRIESTE which had an open sea/oil
interface compensator at the time. Of
course, any additive or purgative
would first have to be proved mate-
rials compatible.”

Utilizing this and other information
gained over several years’ experience with
the STAR class vehicles, Evans and co-
worker B. B. Miron proceeded to draw up the
design specifications for pressure compensa-
tion of the SEA CLIFF and TURTLE battery
pods (19).

The best compensating fluid for battery
systems has been particularly difficult to
define. According to Work (11), ‘“‘The ideal
compensating fluid is non-reactive, non-com-
pressible, and probably non-existent.” In an
attempt to solve this dilemma, the Naval
Ship Research and Development Center
(NSRDC) performed an assessment of appli-
cable experience with such fluids and tests of
their own to issue a guide (20) providing
critical properties, evaluation methods and
other pertinent fluid and lubricant informa-
tion to the workers in deep submergence.

NSRDC not only dealt with fluids for com-
pensation and shielding from the seawater
environments, but also looked at fluids for

hydraulic systems (power transmission) and
lubrication for deep submergence applica-
tion. A variety of fluid properties were inves-
tigated in these tests: Viscosity (temperature
and pressure effects on), lubricating ability,
effects of contamination, corrosion protec-
tion, dielectric properties, dissipation factor,
ability to form stable emulsions, material
compatibility, volatility and toxicity, com-
pressibility and density, chemical stability,
fire resistance and cost and availability.
From these tests and other sources Table 7.5
was derived which provides a ready refer-
ence for assessing the applicability of a par-
ticular fluid in deep submergence applica-
tions. The NSRDC authors caution that a
listing of P after a fluid does not constitute
endorsement for use, nor does Q constitute
condemnation.

FUEL CELLS

In 1965 General Dynamics installed and
tested an Allis-Chalmers fuel cell in its STAR
I (Fig. 7.12). A schematic of the fuel cell used
in STAR I is shown in Figure 7.13 and ac-
cording to reference (21) it works in the
following manner. The basic construction
consists of two electrodes separated by an
electrolyte (potassium hydroxide). A hydra-
zine fuel is admitted to the anode electrode,
where it reduces hydroxyl ions in water and
releases electrons. The electrons flow
through the external circuit to the other
electrode (the cathode), where the oxidant is
admitted. The electrons are used in the oxi-
dant’s reaction with water to form hydroxyl
ions. Ionic conduction through the electro-
lyte completes the electrical circuit and pro-

TABLE 7.5. IDENTIFICATION OF FLUID CODES

Supplier

E. F. Houghton Co., 303 W. Lehigh Ave., Philadelphia, Pa. 19133
Bray Oil Co., 3344 Medford St., Los Angeles, Calif. 90063

Bray Oil Co., 3344 Medford St., Los Angeles, Calif. 90063

Fluid

Code Commercial Name
A PR-1192

B Micronic 713

C Micronic 762

D NDH-TD4-1

E Hoover Submersible Fluid No. 2
F Tellus 11

G Tellus 15

H Tellus 27

J Primo! 207

K Marcol 52

L SF-1143

M C-141

N PR-85-29-129

New Depatture — Hyatt Bearings, Hayes Ave., Sandusky, Ohio 44871
Hoover Electric Co., 2100 South Stoner St., Los Angeles, Calif. 90025
Shell Oil Co., 50 W. 50th St., New York, N.Y. 10020

Shell Oil Co., 50 W. 50th St., New York, N.Y. 10020

Shell Oil Co., 50 W. 50th St., New York, N.Y. 10020

Humble Oil and Refining Co., P.O. Box 1288, Baltimore, Md. 21203
Humble Oil and Refining Co., P.O. Box 1288, Baltimore, Md. 21203
General Electric Co., Silicone Products Dept., Waterford, N.Y. 12188
Royal Lubricants Co., River Road, Hanover, N.J. 07936

E. F. Houghton Co., 303 W. Lehigh Ave., Philadelphia, Pa. 19133

331

TABLE 7.5 SUMMARY LIST OF FLUIDS AND LUBRICANTS [FROM REF. (20)]

Application
Base Nonmoving
Fluid Power Motor Switching Electrical
Specification or Compo- Trans- Lubri- |mmer- Component Equipment
Trade Name Other Designation sition mission cation sion Immersion Immersion
Federal Specification Products
VV-1-530a Transformer Oil Petroleum —— a 0] KP KP
VV-D-001078(10 cs) Damping Fluid Silicone 0] 0) KO KO KP
VV-D-001078(50 cs) Damping Fluid Silicone KQ a Q Q Q
Military Specification Products
MIL-H-5606B Aircraft Hydraulic Fluid Petroleum KP KP KP P B
MIL-J-5624F JP-5 Petroleum —— KO KO Q Q
MIL-L-6081C, Jet Engine Lubricating Oil Petroleum KQ KO KO KO Qa
Grade 1010
MIL-H-6083C Aircraft Hydraulic System Preservative Petroleum K KO KO KO KO
MIL-L-6085A Aircraft Instrument Oil Synthetic Ka KO KO Q Qa
MIL-L-7808G Gas Turbine Lubricating Oil Synthetic —— KO Q Qa Qa
MIL-L-7807A Low Temperature Lubricating Oil Petroleum —— K Q Q Q
MIL-C-8188C Gas Turbine Engine Preservative Synthetic KQ KO Q Q Q
MIL-F-17111 Ordnance Hydraulic Fluid Petroleum Q [? == -- P
MIL-L-17672, Turbine Oil and Hydraulic Fluid Petroleum KO KO 0] Q P
MS 2110-TH
MIL-S-21568A Damping Fluid Silicone Qa Q KO KP KP
MIL-L-23699A Aircraft Turboprop and Turboshaft Synthetic —— KO -- = -—-
Lubricant
MIL-H-27601A Aircraft High Temperature Hydraulic Petroleum —— -- -- -- -—-
Fluid
MIL-H-46004 Missile Hydraulic Fluid Petroleum KQ -- -- -- -—-
MIL-H-81019B Aircraft and Missile Hydraulic Fluid Petroleum P 10} -- -- P
MIL-H-83282 Aircraft Hydraulic Fluid Synthetic -—- --
Proprietary Fluids
Fluid Code A Seawater Emulsifying Fluid, Type | Petroleum KQ KQ Q Q Q
Fluid Code B —- Petroleum KP KO Qa 0] Qa
Fluid Code C Proposed Specification MIL-H-25598 Petroleum KP KO Q Q Qa
Missile Hydraulic Fluid
Fluid Code D Traction Drive Fluid Petroleum —— —- -- -- --
Fluid Code E a= Petroleum —— KO KO -- P
Fluid Code F -- Petroleum P P —- -- P
Fluid Code G as Petroleum P [? — -- P
Fluid Code H —- Petroleum P P -- -- -——
Fluid Code J USP Mineral Oil Petroleum —— Q KO KO KP
Fluid Code K NF Mineral Oil Petroleum —— Q -- =—- ==
Fluid Code L Lubricity Improved Silicone Silicone 6] 0) KQ KP KP
Fluid Code M -- Petroleum —— P Qa 0] Qa
Fluid Code N Seawater Compatible Water Glycol Water — Qa Q 0] Q
P — Possible use Qa — Questionable for use in this application
K — Known or attempted use —— (blank) — Insufficient information available for assessment of use

332

Fig. 7.12 Installing hydrazine and oxygen fuel cell in STAR | (Gen. Dyn. Corp.)

duces the usable electrical energy. The fuel
cell is an electrochemical device converting
energy from the reaction of two chemicals
into low voltage, DC electrical energy.
Whereas a battery’s energy is stored, a fuel

cell will produce current on demand as long
as the fuel and oxidizer are supplied.

The fuel cell in STAR I is pressure-compen-
sated, not by oil, but by the nitrogen gas
released when the hydrazine fuel is con-
sumed.

The authors, Loughman and Butenkoff,
cite the following advantages to fuel cells:
Turn-around time is minimal, in that only
the refurbishing of fuel and oxidant is re-
quired; they are lighter than comparable
power-producing batteries and do not take
up as much space; they have longer life than
conventional underwater power sources;
they may be tapped at any voltage and not
affect cell life; and they are silent and oper-
ate at relatively low temperatures. Other
than this one report (21), nothing further has
been heard from this program.

In November 1969, the Perry company en-
tered a fuel cell test program with Pratt &
Whitney Corp. which resulted in the installa-
tion of an oxygen/hydrogen fuel cell in the
underwater habitat HYDRO-LAB situated in
50 feet of water off Palm Beach, Florida (22).
While this application is outside the subject

N, GAS (OUT)

KOH, N>H,4, N> (OUT)
C)

KOH & FUEL
RESERVOIR HEAT

O, SUPPLY

O, PURGE

EXCHANGER

3-WAY
THERMOSTATIC
VALVE

KOH, NH, (IN)

Fig. 7.13 Schematic of STAR | fuel cell. [From Ref. (21)]

of manned submersibles, it was, according to
the author, the first such application in a
habitat and supplied 5 kilowatts at 28 VDC
for a period of 48 hours and with no malfunc-
tions. This report’s final statement rather
succinctly states the major problem with fuel
cells: ‘‘A reduction in cost is required before
extensive use becomes a reality.”

The latest attempt at utilizing fuel cells in
submersibles was conducted off Marseilles in
May 1970 with a hydrazine-hydrogen perox-
ide generator in the SP-350 (23). Several
tests of this fuel cell were conducted in 265
feet of water during a series of dives of not
more than 15 minutes in length. The investi-
gators concluded that the tests were success-
ful and indicated that the fuel cell is not only
a theoretical possibility, but a practicality in
submersible operations.

For those interested in the potential and
technological state-of-the-art of fuel cells for
deep submergence application references (5),
(24), (25), (26), and (27) are recommended. The
last two of these include a discussion of
nuclear and other power sources, as well as
fuel cells.

NUCLEAR POWER

The U.S Navy’s NR-1 is the only submers-
ible known to use a nuclear reactor as an
electric power source. Since NR-1’s details
are classified, one can only speculate about
it. On the other hand, while nuclear power
has revolutionized the military submarine,
its past, present and proximate influence on
submersible design is likely to be minimal.
The reason is quite simple; NR-1 costs in the
neighborhood of $100 million; even the most
optimistic advocates of deep submergence
would find it difficult to justify such an ex-
penditure for a commercial venture. Again
the reader is referred to references (5), (26),
and (27) for an account of nuclear power
potential and application to other areas of
marine technology.

CABLE-TO-SURFACE
(UMBILICAL)

Three submersibles obtain electrical power
through a cable from the surface: KURO-

334

SHIO II, GUPPY and OPSUB. The pros and
cons of this approach are many and will not
be explored in detail here. It is sufficient to
note that in the case of GUPPY, the reason-
ing which led to an umbilical included:
Launch/retrieval would require no divers
and the projected customer (offshore oil)
would require more in the way of electrical
power than batteries or fuel cells could sup-
ply within the dimensional constraints of the
preconceived vehicle (28). An additional con-
sideration was based on KUROSHIO’s and
the unmanned CURV’s history of successful
tethered operations—i.e., they provided
proven techniques.

A few submersibles, SEA RANGER in par-
ticular, include an umbilical option by pro-
viding an external electrical attachment.
The option has a great deal of merit if tasks
are required where long-term, stationary ob-
servations are planned, such as may happen
in some biological or sedimentological stud-
ies. The design, construction and operation
of a tethered power supply is discussed fully
in the literature. For a thorough and excel-
lent summary of the subject, the work of Evo
Giorgi (27) is reeommended.

The umbilical system is basically quite
simple (Fig. 7.14) and consists of a generator,
winch and a load-bearing, conducting cable.
In the GUPPY operation, the surface genera-
tor sends 35 kW at 440 VAC down the insu-
lated and strengthened cable to the vehicle.
Since power coming to the submersible is
already AC, no on-board converters are
needed, with consequent weight and volume
savings. Buoys are attached at intervals
along the cable to keep it from fouling the
vehicle and adding to the propulsion load.
The cable also serves as a hard line underwa-
ter telephone.

The KUROSHIO II system—essentially
similar to that of GUPPY—sends 400 VAC to
the submersible where a transformer within
the pressure hull supplies 100 V to the vehi-
cle’s instruments. Specifications for KURO-
SHIO II’s generator and cable are presented
in Tables 7.6 and 7.7, respectively. The cable
winch is driven by a 10-hp, AC motor and
consists of a controller, reduction gear, reel
and winding drum mounted on a common
platform (29).

UMBILICAL HYDRAULIC WINCH
CABLE WINCH

GENERATOR

GUPPY IN STOWED POSITION
(SHOWN FOR CLARITY ONLY)

WORK w
BOAT
——_—_—_—_——
FORWARD
UMBILICAL CABLE
ELECTRIC CABLE - 1 1/80 D
Sein) BUTYL ARMOR, NON-HOSING
GENERATOR
FLOAT BOX
=
CABLE
—___—_
FORWARD GUIDE
GUPPY’S
CORING
CABLE WINCH DEVICE GUPPY DURING OPERATIONS
GUPPY 1,000’ MAXIMUM

TOWED POSITION
PLAN OF BOAT DECK (STOWED POSITION)

Fig. 7.14 GUPPY’s operational system. (W. Watson, Sun Shipbuilding and Dry Dock)

TABLE 7.6 SPECIFICATION OF AC GENERATOR AND PRIME MOTOR OF KUROSHIO
[FROM REF. (29)]

AC Generator Prime Mover

Type: Totally-Enclosed Type: 4-Cycle Single-Acting Diesel Engine

Output 25 KVA Output 30 hp
Revolution 900 rpm Revolution 900 rpm
Rating Continuous

Voltage AC 470 V

Frequency 60 cps

335

TABLE 7.7 THE SPECIFICATION OF THE POWER CABLE OF KUROSHIO [FROM REF. (29)]

nnn e EEEEEEEEEEEEEEEE EE

Power Telephone Selsyn

Item Type 3-Core 1 Circuit 2 Circuits Coaxial
eS
Number of cores 3 2 2 3 1
Nominal sectional area (mm?) 14 1.25 0.75 0.75 =
Outside diameter (Approx.) (mm) 8.4 8.5 8.4 8.5 8.5
Outside diameter of tension meter (Approx.) (mm) 9
Finished outside diameter (Approx.) (mm) 36
Weight in the air (Approx.) (kg) 2.05

Weight in the water (Approx.) (kg)

Length (m)

0.75 (Note: Buoys are attached in actual use)

600

From a safety viewpoint, the cable may be
either friend or foe. In the event of the
vehicle fouling or the loss of surfacing abil-
ity, the cable can be used as a retrieval line.
Conversely, if the cable fouls, provisions are
made in KUROSHIO II for the occupants to
release the cable directly from the hull.

DIESEL-ELECTRIC

To reduce the dependency on surface sup-
port, several submersibles incorporate diesel
engines in their power inventory for surface
propulsion (Table 7.1) and, in a few, to re-
charge depleted batteries after a dive. In
essence, they follow procedures quite similar
to those of conventional battery-powered
military submarines. The French submers-
ible ARGYRONETE, had it been completed,
would have operated identically to a military
submarine in that its diesel motors would
have provided full autonomy for surface
cruising and battery charging, while lead-
acid batteries would have supplied sub-
merged power.

The submersibles now in existence use
their diesel-electric motors not so much for
long-range surface transits as for charging
batteries or powering an air compressor to
refill depleted air tanks. The following de-
scriptions relate the surface power and de-
tails available for the vehicles SUBMANAUT

336

and TOURS 66. In GOLDFISH a Ford V-8
engine supplies power for direct drive on the
surface and is coupled to a 6.4-kW generator
(200 amp at 32 V) for battery charging and
for compressor operation in recharging of air
tanks.

SUBMANAUT:

Martine’s SUBMANAUT realizes surface
propulsion from a fresh water coiled, General
Motors 6-cylinder diesel engine (Model 6-71)
which develops approximately 235 hp. Sur-
face cruising speed is 10 knots and the on-
board diesel fuel (800 gal) allows a range of
2,000 nautical miles. A 5-kW generator is
belted to the forward end of the diesel engine
and is used to recharge the vehicle’s batter-
ies. Approximately 2 hours of charging time
are required to balance 1 hour of discharge
time (45 amp at 150 V). A 3,000 psi air com-
pressor is also belt driven off the diesel en-
gine and supplies 12 cfm.

TOURS 66: (Fig. 7.15)

A 28-hp, 3,000-rpm diesel generator is
arranged aft in the pressure hull to form an
extension of the battery room deck. All pipe-
lines connected with the diesel engine (ex-
haust gas, fuel, and cooling water) are pro-
vided with compensators. A water-cooled ex-
haust gas silencer is arranged behind the
exhaust gas collecting elbow of the diesel
engine. Exhaust gasses are led through an

PRESSURE HULL

(OC oe
Oo] Lkeo J

Fig. 7.15 TOURS 66 diesel engine layout.

exhaust gas line to outboard. The diesel en-
gine is equipped with decompression equip-
ment and complies with the regulations of
Germanischer Lloyds.

The engine is cooled through a seawater-
freshwater twin circulation system incorpo-
rating both seawater and freshwater pumps.
The diesel fuel tank is within the exostruc-
ture. The fuel (0.47 m’) is delivered by means
of the fuel pump attached to the diesel en-
gine through a fuel tapping dome. Compen-
sation for used diesel fuel is effected by
means of the vehicle’s trim tanks. A surface
cruising range of 400 nautical miles at 5
knots is possible. The diesel engine drives a
DC shunt-wound generator, which is self-
ventilated, and supplies 15 kW of charging
power for the main battery at 3,000 rpm,
with a voltage range between 250 and 290
and a maximum charging current of about 60
amp. Central ventilation is provided for the
battery room. The air is sucked by the bat-
tery-room fan from forward to aft over the
cells. During surface operation the air is
passed to outside via the exhaust air mast.

The present use of diesel engines in sub-
mersibles (only in surface operations) avoids

337

a great number of the problems that would
be encountered in closed-cycle diesel power
systems supplying submerged power (see
refs. 5 and 26). Nonetheless, Sub Sea Oil
Services of Milan is presently conducting a
research and development program which it
hopes will result in a system capable of both
extended surface cruising and closed-cycle
underwater operation for PHOENIX 66.

The results of a program at Aerojet-Gen-
eral, Azusa, California, in 1970 have direct
application to closed-cycle diesel power sys-
tems and warrant the attention of present
and future submersible power design engi-
neers. Commencing as an in-house research
and development program, the Aerojet
power system called ‘‘Psychrodiesel” re-
ceived additional funds from the U.S. Air
Force to develop a breadboard model and
conduct demonstrations of a prototype
closed-circuit power system.

Psychrodiesel operates on a principle Aero-
jet called ‘“‘Psychrocycle,” in which the diesel
engine “breathes” a mixture of oxygen gas
and water vapor in place of air. This syn-
thetic air combusts with diesel fuel to pro-
vide an exhaust consisting only of water
vapor, carbon dioxide and unconsumed oxy-
gen. The steam (water vapor) is condensed,
the carbon dioxide chemically absorbed and
the oxygen recycled to complete an operating
closed cycle. Thus, the complete system is
fully enclosed during an undersea operation.

In a detailed discussion of the history,
development, and operation of the Psychro-
diesel, Hoffman et al. (30) compare its effi-
ciency with other closed-cycle systems, e.g.,
Rankine, Stirling, and Brayton, and specu-
late that the internal combustion engine
may achieve higher thermal efficiency than
the Stirling because its maximum cycle tem-
perature is nearly double. Of particular in-
terest is their design of a Psychrodiesel sys-
tem (both closed-cycle and air breathing) for
small and large submersibles which could
supply power for propulsion and hotel loads.
The small submersible Psychrodiesel pack-
age is 4 feet in diameter by 6 feet in length
and delivers 60 kWh submerged. The large
system configuration constitutes a module 4
feet in diameter by 20 feet in length, totaling
16,000 pounds and delivering 1,000 kWh sub-

merged and 2,000 kWh surfaced. Both de-
signs are shown in Figure 7.16.

POWER DISTRIBUTION

Few submersible components receive more
attention than the penetrators, cables and
connectors used to distribute electric power.
The reason is clearly evident when the per-
formance of submersibles is reviewed: These
components range in reliability from mar-
ginal to deplorable. One might wonder why
this inadequacy was not discovered in the
near half-century of military diving before
the advent of the manned submersible. The
answer, in part, resides in the large size of
fleet submarines relative to submersibles. A
military submarine carries its power and
propulsion machinery within the hull, and
except for sonar devices, communication an-
tennae and depth sensors, very little else
penetrates the hull. More importantly, the
WWII submarine, except in emergency,
dived no deeper than about 300 feet; at this
depth the requirements for a successful pen-
etrator are considerably relaxed. From an
electrical point of view, a manned submers-
ible is a submarine turned inside out. Indeed,
in some vehicles the majority of electrical
hardware is external to the pressure hull
and subject to every transgression in the
deep-ocean’s arsenal.

One of the most beneficial aspects of the
DSSRG Report to both the military and civil-
ian submersible builders was the illumina-
tion of problems associated with power dis-
tribution and the steps taken to identify,
categorize and remedy these problems. One
of these steps was establishment of the Deep
Ocean Technology (DOT) program in 1966
under the Chief of Naval Material, and one
of DOT’s most significant contributions is
the Handbook of Vehicle Electrical Pene-
trators, Connectors and Harnesses for Deep
Ocean Applications (31).

Based on an exhaustive investigation into
past and present penetrators, connectors
and harnesses (cables) used in deep submer-
gence, the Handbook presents the factors
involved in design and development of these
components and includes the advantages
and limitations of designs which have seen
application. The Handbook serves not only

338

the designer of future submersibles, but the
operator of present vehicles as well. Use of
the information therein could avoid some of
the major obstacles to an otherwise success-
fully designed vehicle.

Owing to the comprehensive, wide ranging
nature of the Handbook, it would be redun-
dant herein to relate the many and varied
problems encountered along the way to relia-
ble or even quasi-reliable electric compo-
nents. Hence, this discussion will only high-
light and broadly define the nature of the
component and its application.

Electrical Penetrators

An electrical penetrator serves to pass
power or signals through the wall of a pres-
sure-resistant capsule, e.g., pressure hull or
battery pod. In this role it must satisfy two
collateral duties: 1) Seal and insulate the
thru-hull conductors, and 2) preserve the
hull’s watertight integrity under both nor-
mal and abnormal (short circuit) conditions.

Some 383 companies in the U.S. manufac-
ture electrical penetrators and connectors;
the variation in design and components pre-
cludes any one schematic representative of
the electrical penetrators.

Consequently, the penetrators described
are selected from various depth ranges
merely as an introduction to past and pres-
ent technology.

ASHERAH, a 600-foot submersible, uses a
penetrator incorporating the stuffing-tube
type of seal which was one of the first de-
signs used in military submarines (Fig.
7.17a). Pressurization of the materials to ob-
tain a seal is accomplished by tightening the
inboard gland nut. One limitation to a jam
type of seal such as this is determining the
correct amount of pressure to apply which
will prevent the cable from extruding into
the hull yet not damage the cable and which,
at the same time, will assure watertight
integrity. Repressurization is required from
time to time to compensate for the compres-
sion set of the packing and cold flow of the
conductor jacket material. The penetrator
used by Beebe (which carried two power
conductors and two telephone cables) in the
BATHYSPHERE followed the stuffing-tube
principle.

CO, ABSORPTION
WALL CONDENSER TANK

LUNG

LOX DEWAR

COOLANT
CONDENSATE
TANK

GENERATOR

Submersible Power Supply

GENERATOR FUEL TANK

ENGINE 3 FT SPHERE

KO, CANNISTERS CONTAINER

GEARBOX 4-FT DIAM. x 12 FT LONG

COOLANT PUMP

Fig. 7.16 Submersible power pod. [From Ref. (30)]

339

RECEPTACLE
Pe PLUG

BODY OUTBOARD O-RING

LINER
HULL ae HULL
INBOARD
PACKING
a RECEPTACLE
GLAND RING
LOCKWASHER
OUTBOARD :
GLAND NUT i LINER
HULL
INBOARD
a. ASHERAH Stuffing Tube b. Perry Submarine Penetrator

INSPECTION PLUG

POLYURETHANE PY ROTENAX
POTTING ~—___ CABLES

RECEPTACLE
WAX

OIL FILLED OUTBOARD ARALDITE

HULL BODY EPOXY
OUTBOARD HULL
7 FITTING
t==—— FITTING SEAL
HEADER
HULL RUBBER
GASKET
HULL PLEXIGLASS
POTTING
INBOARD
SPACER
INBOARD RETAINER
NUT
c. Redesigned ALUMINAUT Penetrator d. TRIESTE | Penetrator

Fig. 7.17 Some examples of submersible electrical penetrators.

340

DEEP DIVER, a 1,200-foot vehicle, uses
both Vector and Electro Oceanics (EO) pene-
trators. An EO type penetration is shown in
Figure 7.17b (bottom) and Figure 7.18 shows
outboard configurations of the same penetra-
tor. The receptacle is essentially screwed
into a stainless steel insert and the cable
then connected thereto. A number of blanked
inserts are shown in Figure 7.18; these can
be used for additional electric penetrations
or whatever is required. Similar EO penetra-
tors are used on General Dynamics’ STAR IT
and the DEEPSTAR 4000.

“ec

ALUMINAUT, designed for 15,000 feet, uses
three Vector-built and General Dynamics-
designed penetrators. The body of the pene-
trator is of 7079 T6 aluminum, the same as
the hull, and is a metal-to-metal seal. The
tapered body is held into the hull with an
inboard retainer nut. The connectors are
mounted to the outboard end of the penetra-
tor and comprise plastic bodies with the
plugs of molded rubber. Troubles at the out-
board plug-receptacle interface prompted a
redesign which is shown in Figure 7.17c.

In the TRIESTE design (by Piccard) the

4 s bd
a 2
_—

Fig. 7.18 Electric power thru-hull connector on DEEP DIVEF.. (NAVOCEANO)

pyrotenax cables are sealed to the penetra-
tor body with an epoxy potting compound
and a soft wax overlay (Fig. 7.17d). Should
the epoxy material crack over periods of
service, then the wax under hydrostatic
pressure would seal the voids. The cables are
prevented from being axially forced into the
sphere by washers brazed to the cables.
These washers have the proper amount of
surface area to withstand the hydrostatic
pressure. The penetrator body is sealed to
the pressure sphere with a conical plexiglass
ring which is pressurized initially by a re-
tainer nut inside the sphere. The nut holds
the fitting to the hull and initially pressur-
izes the plexiglass material to effect a seal at
low pressures. The seal becomes more effec-
tive with depth due to high hydrostatic pres-
sure on the penetrator body. Similar pene-
trators are used on FNRS-3, ARCHIMEDE
and BEN FRANKLIN.

The BEN FRANKLIN, during its Gulf
Stream Drift, used two other commercial
penetrators: A Viking penetrator and a Brit-
ish design known as the “molded gland” (Fig.
7.19). Additionally, a specially designed pene-
trator, basically a 13-mm-diameter copper
rod 215 mm long with a bronze machined
collar on the outboard end, was used to carry
power from the batteries into BEN FRANK-
LIN’s hull; similar penetrators also serve for
battery charging and shore power. Figure
7.20 shows these specially designed penetra-
tions carrying main propulsion power
through the hull, and Figure 7.21 shows
their construction.

The British “molded gland” penetrator has
been used by Royal Navy submarines for
several years with no reported failures (32).
It was originally designed for underwater
cables and saw its first U.S. application in
1969 on the BEN FRANKLIN (Fig. 7.22). A
paper by K. R. Haigh (33) describes the
molded gland and its advantages over other
systems. The basic principle of this gland is
as follows: The polythene (polyethylene)-in-
sulated cable core passes through the pres-
sure hull, which is locally deformed by a
protruding hollow spigot with a castellated
external surface. The seal is formed by mold-
ing polythene around the castellated spigot
and the cable core. On cooling, the core insu-
lant becomes homogeneous with the poly-

342

thene, which also contracts on the castel-
lated surface. The application of water pres-
sure increases the contact pressure between
the polythene and the spigot, thus making
the gland inherently self-sealing. Pretreat-
ment of the spigot by the application of a
thin film of polythene bonded to the surface
ensures that the molded polythene bonds to
the castellated surface. If the cable is sev-
ered outboard at the hull, ingress of water is
prevented during the molding process by
forcing epoxy resin under pressure down the
interstices of the multi-strand conductors
thereby eliminating any voids which may be
present between sheath and conductor. Fora
period of 1 year, glands of this type were
subjected to a water pressure of 5 tons/
square inch without any evidence of penetra-
tion. Each gland is supplied with tails on
both the high and low pressure sides and
installation consists of screwing the gland
body into a prepared housing in the subma-
rine pressure hull.

To join the two cable tails together, a
portable injection-molding machine shoots a
hot charge of polythene under hand pressure
from a gun into a transparent Perspex (plexi-
glass) mold clamped around the section of
cable core or sheath requiring reinsulation.
The use of Perspex, which has a relatively
low thermal conductivity, avoids the need for
heating the mold, while ensuring that the
injected polythene is not cooled at a rate
which would prevent its complete amalgama-
tion with the conductor insulation or sheath.
It also permits the operator to watch the
filling of the mold right up to the time when
reinstatement of the insulation is complete.
The complete joint can be tested hydrauli-
cally by clamping a water jacket around the
cable and applying any required pressure.
By this means, the complete external electri-
cal system can be tested for water-tightness
to full diving depth and beyond while the
submersible is still being built or at the dock.

This system is described in some detail
because it departs radically from U.S. sys-
tems, in that, there is a continuous hard line
conductor running from the external instru-
ment into the hull. U.S. systems, on the
other hand, contain separate conductor con-
tact points externally at either the hull or a
connector, and again at the cable and the

Fig. 7.19 A variety of penetrators on BEN FRANKLIN. (NAVOCEANO)

instrument. It is these connect/disconnect
points which cause most of the trouble.

The DOT program identified some 30 dif-
ferent penetrator types used on underwater
vehicles and, based on failure modes and
effects analyses, compiled a list of 22 design
considerations applying to electrical penetra-
tors. Such details are beyond the scope of
this discussion, but from a historical and
state-of-the-art point of view four design fac-

COPPER ROD OUTBOARD
| CONICAL PLEXIGLASS HIGH PRESSURE SEAL

| | PLEXIGLASS HIGH PRESSURE SEAL

RING Weal \ STAINLESS STEEL CLAMP BRAZED JOINT
LOCKING | SCREW, \ | | OC SING KEY 7 CABLE INSULATION
NUT / SEAL NEOPRENE BOOT
| | | V a 95 MM? CABLE TO
AN |_| PENETRATOR

ir |

|
(C1

RUBBER TAPE FROM
FIELD SPLICING KIT
| | RUBBER BOOT (SHRINK TUBING)
FROM FIELD SPLICING KIT
BRASS CONNECTOR
| (SCREW CONNECTED
TO SILVER FEMALE)

\\

N \ INSULATING LOCKING NUT \
\
\ NEOPRENE BOOT

COPPER STUD (MALE) \ \ |
PIN CONNECTOR \ SILVER FEMALE
\ \ CONNECTOR SOCKET
FEMALE SOCKET Ns . \

\ BRONZE MACHINED COLLAR
CRIMP CONNECTOR

u

ie \. NEOPRENE BOOT

TO FUSE BOX \,
95 MM? CABLE

\ NEOPRENE MOLDED COVER
\ STEEL PENETRATOR SLEEVE

\
NEOPRENE GASKET FOR LOW PRESSURE SEAL

Fig. 7.21 Electrical penetrator (95 mm) on BEN FRANKLIN.

343

Fig. 7.20 Piccard penetrators with Marsh Marine (Vector) connectors and specially-
designed main power penetrators on BEN FRANKLIN. (NAVOCEANO)

Fig. 7.22 A molded gland atop a 3.5-kHz transducer. (NAVOCEANO)

tors should be mentioned: entry configura-
tion, hull fastening methods, hull sealing
methods and hull insert types.

Penetrator Entry:

Cable can enter the hull vertically (Fig.
7.17a), or at any angle from vertical to hori-
zontal (Fig 7.17c). The horizontal entry pro-
vides the most advantages because the ca-
bles can be supported and protected more
easily.

Hull Fastening Methods:

Several methods exist to secure penetra-
tors to the pressure hull (Fig. 7.23). Briefly,
the following comments can be made for each
approach:

a) Bolted Flange—Bolting directly to hull
may produce a stress concentration
area; the flange consumes a large sur-
face area outside the hull and may also
cause crevice (and other) corrosion prob-
lems.

b) Internal Lock-Nut—The most widely used
method, it provides the least problems.

¢) Welding—This conserves space but is per-
manent and, therefore, hampers re-

STUD

X.
/ SEAL RING
WASHER ~ x

BOLTED LOCK NUT
FLANGE
INTERNAL

LOCK-NUT

a

ADHESIVE
FASTENING

aan

TAPERED
THREAD

BONDING
COMPOUND

WELDING

Direct
Screwing

\ STRAIGHT
THREAD

Fig. 7.23 Penetrator to hull fastening methods.

344

placement for maintenance. Also, some
hull materials are not weldable.

d) Adhesives—These have a low confidence
level at present.

€) Direct Screwing—This poses machining
and stress concentration problems.

Hull Sealing: (Fig. 7.24)

In this respect replacement or removal of
the penetrator for inspection is a general
requirement. Therefore, welding or adhe-
sives are precluded.

a) Flat-Gasket—This requires periodic re-

pressurization.

b) O-rings—These provide excellent low

pressure seals, most widely used.

C) Metal-to-Metal Tapered Seal—An eighty per-

cent metal-to-metal contact is desired
and very precise machining is required.

Hull Insert Types:

The basic insert types are shown in Figure
7.25. Threaded, tapered and conical inserts
are found in most submersibles. In the conical
insert a plastic gasket is pressurized into the
cone area by tightening an inboard lock-nut.
Stepped hole inserts create stress concentra-

FLAT GASKET
O-RING
O-RING
O-RING
TAPERED
SEAL AREA
O-RING

Fig. 7.24 Penetrator to hull sealing methods.

a

THREADED TAPERED

STEPPED STEPPED

= ae

US. NAVY TYPE CONICAL HOLE

U.S. NAVY
TYPE

Fig. 7.25 Typical hull inserts for electrical penetrators.

tions, and thus a tapered hole is favored, al-
though individual matching of each penet-
rator may be required to fit each insert. The
hull insert material must be the same as the
hull material and full penetration welds at
the insert-hull interface are desired.

Electrical Connectors

Cables (harnesses) and connectors for elec-
trical components have been the most failure
prone items on submersibles, and, while such
failures may not jeopardize the occupant’s
safety, they can result in the loss of time,
money and good diving weather in the form
of aborted dives and subsequent down-time
for repairs.

Any attempt to lay the blame for connector
and cable failures reduces to the dilemma of
“Who struck John?” Earlier, Rynewicz (2), a
user of connectors, cautioned submersible
designers that cables, connectors and circuit
breakers constituted the major areas for im-
provement in deep submergence. Another
user, a senior engineer for Perry Submarine
Builders, recently replied to a query regard-
ing the connectors they found most reliable:
“We use one until we get disgusted with it
and then replace it with another until we’ve

345

had enough of it!” International Hydrody-
namics, as noted above, finally gave up and
makes its own connectors and penetrators.

Conversely, J. D. Tuttle, a manufacturer
and vendor of connectors (Electric Oceanics,
Inc.), states (34) that much of the fault re-
sides with the user for not establishing speci-
fications which completely encompass the
boundary conditions within which the con-
nector must function. Furthermore, Tuttle
suggests that the user may not understand,
among other things, the maintenance proce-
dures and limitations of a perfectly well de-
signed and manufactured connector. D. K.
Walsh (35), a manufacturer (Vector Cable
Co.), also lays the blame on the user and
states that the principal area of abuse has
been in misapplication, mishandling and
careless installation.

A revealing insight into the problem is
provided by the DOT Handbook in the form
of a Failure Mode and Effects Analysis, for
connectors, penetrators and junction boxes.
The investigators identified 142 modes by
which failures of these components could
occur. The failures are grouped under Inher-
ent (manufacturing design deficiency and
material fatigue) and Induced (installation/
assembly deficiency, maintenance deficiency,
excessive operational demands and rough
handling). If it is assumed that inherent
deficiencies are laid to the manufacturer and
induced to the user, then the user appears to
be the chief potential culprit, for in 181 out of
297 causes of failure the user is to blame. To
clarify these figures it should be noted that
both user and manufacturer may be found
guilty in the case of one failure, for example,
where insulation material breaks down due
to use of contaminated materials, the cause
could be inherent in the original design, or
induced through installation/assembly, im-
proper use or deficient maintenance.

It would appear, then, that both manufac-
turer and user share somewhat equally in
the problem, the former by ignoring various
ramifications; the latter through ignorance
or inattention to details.

Connector Design:

There are dozens of companies in the U.S.
which produce connectors both for commer-
cial application and for which the military
has supplied specifications. Military specifi-

cations for a general-purpose connector most
generally applied in undersea application are
described in Navy Bureau of Ships MIL-C-
24217. Connectors for the civil sector in gen-
eral application are supplied by Vector (for-
merly Marsh Marine), Joy, Electro Oceanics,
D. G. O’Brien, Viking Industries and ITT
Cannon Electronics. In addition to those
noted, a variety of other companies produces
standard and special purpose connectors. No
specific point, other than displaying the
mind’s ingenuity, would be served by de-
scribing each connector in detail. For those
interested in such details, reference (36) is
recommended. For a more general overview
the results of the DOT program will serve
adequately wherein five basic designs were
evolved from the multitudes which *“...
seal the cable and provide the desired
electrical continuity between components”
(31); these are:

a) Cable stuffing tube component penetra-

tor

b) Pressure proof electrical connector

c) Molded cable penetrator

d) Molded cable penetrator with insulated

backing header insert

e) Flange mounted polyethylene molded

plug penetrator.

All of these devices (Fig. 7.26) are similar to
those noted for electrical hull penetrators.
Pressure proof electrical connectors (Fig.
7.27) are of major concern because of their
more widespread use. Connectors of the type
shown in Figure 7.26 offer several individual
advantages—e.g., they may be inexpensive
and quite reliable—but the major disadvan-
tages outweigh the advantages, to wit: The
penetrator must be scrapped if the cable is
damaged in service, and, most importantly,
there is no convenient disconnect point at
the component. Numerous other advantages
of the pressure proof electrical connector are
outlined in reference (31).

An electrical connector consists of a plug
and receptacle assembly. The heart of the
connector is the pin and socket contacts
which make the electrical junction. The ma-
jority of connectors in use today can be di-
vided into four types based on construction
material. These are:

a) Metal plug and receptacle

b) Molded rubber plug and receptacle

346

c) Plastie plug and receptacle

d) Underwater disconnectable connector.

The following comments regarding the ad-
vantages and disadvantages of the above
connectors are taken from the DOT Hand-
book.

Metal Shell Connector:

The metal construction which provides a
rigid skeleton has demonstrated the greatest
degree of reliability on submersible equip-
ments. The nature of the design requires
more component parts, is heavier and has
greater initial cost. However, these disad-
vantages are more than offset by a higher
degree of reliability and resistance to instal-
lation and environmental damage. The
added initial cost becomes insignificant when
related to overall system cost and the critical
role a connector plays in a system’s satisfac-
tory performance. A single connector failure
can abort an entire mission.

The metal plug shell provides a rigid and
adequate bonding surface for the cable seal
and thus provides adequate cable strain re-
lief at this point. The rigid construction
makes possible a greater degree of wire posi-
tion control in molding a cable to the plug
and, therefore, much less chance of electrical
shorts or opens due to uncontrolled migra-
tion of conductors during the cable end seal-
ing process. The metal shell provides a posi-
tive stop for controlled gasket squeeze in
seal areas between plug and receptacle and
between receptacle and mounting surface.
Metal has the necessary strength and dimen-
sional stability to provide reliable threaded
parts. A metal receptacle shell provides the
necessary support for a positive and reliable
pressure barrier in case of accidental expo-
sure to sea pressure. Metal construction pro-
vides for a more reliable mounting of bulk-
head types and an additional mounting
method, namely a seal weld. An individual
insulator in combination with snap-in socket
contacts provides good contact positioning
for proper mating alignment. Metal bodies
are best adapted for positive keying to polar-
ize plug with receptacle. Where both plug
and receptacle shell are of a nonresilient
material, a more reliable coupling can be
accomplished. Elastomer compression set
and material flow with resulting loosening is
not a problem.

POLYETHYLENE
JACKETED CABLE

STRAIN RELIEF
GROMMET

STRAIN RELIEF

CABLE: DSS-3
(NEOPRENE JACKET)

—~=— CABLE

MOLDED NEOPRENE

SLEEVE
MOLDED BOOT
& PLUG INSULATION MOLDED PENETRATOR BODY
POLYETHYLENE

PLUG
ASSEMBLY

COUPLING RING

RECEPTACLE
ASSEMBLY :
Ss Peay RING

| FLANGE MOUNTED
| PLUG SHELL

Li

i

O-RING

GLASS SEAL AH COMPONENT
COMPONENT i EAE)
BULKHEAD
HOGKNUT cal [oni COMPONENT RETAINING NUT
f } BULKHEAD CRIMP TYPE
ELONGATED CONTACT ] | SPLICE CONNECTOR
Pressure Proof Electrical Connector Flange Mounted Polyethylene Neoprene Molded Cable Penetrator

Molded Plug Penetrator

CABLE

MOLDED NEOPRENE CABLE
BOOT

GLAND NUT
PLASTIC CONTACT
INSULATOR
LOCKWASHER
HEADER INSERT WASHER
STAINLESS STEEL RUBBER GROMMET
SHELL
COMPONENT
BULKHEAD
RETAINING NUT
EPOXY POTTING COMPONENT ENCLOSURE
Molded Cable Penetrator With Cable Stuffing Tube
Insulated Backing Header Insert Component Penetrator

Fig. 7.26 Five basic designs for sealing a cable and transmitting electrical power between components.

347

CABLE

CABLE

O RING

SOCKET
CONTACTS

COUPLING RING

ALL PLASTIC PLUG

NEOPRENE
MOLDED BODY

O RING
CONNECTOR SPUT TYPE PIN CONTACTS
SEAL AREA PIN CONTACT ALL PLASTIC RECEPTACLE

(INTERFERENCE FIT) BULKHEAD

~<N
|

>
a

Wess
nase

SS
=

SOCKET CONTACT

NEOPRENE

MOLDED BODY Molded Plastic Connector

if

CABLE

CABLE

: ——— MOLDED BOOT
Molded Elastomeric Connector

PLUG ASSEMBLY

COUPLING RING
O RING

RECEPTACLE
ASSEMBLY
O RING
WELD

Metal Shell Connector

Fig. 7.27 Types of connectors presently in use.

348

Disadvantages of metal connectors in-
clude: The need for additional individual con-
tact seals which are inherent in the inte-
grally molded rubber type connector; danger
that sealing surfaces may be damaged, caus-
ing possible seal failure; susceptibility to cor-
rosion, depending on material choice, envi-
ronment and the influence of other interfac-
ing metals and/or stray electrical currents;
need for insulation to provide electrical isola-
tion of the conductors; and the need to se-
cure and seal these parts. Additionally, ap-
plications that require the metal connector
to be subjected to a considerable degree of
pressure cycling call for special attention to
the manner of wiring and how the conduc-
tors are supported in the back end of the
plug between the cable-end seal and the con-
ductor termination. Otherwise, fatigue fail-
ure of the conductor can occur. Where nonre-
silient parts interface at plug and receptacle,
a minimum volume void is always present
because necessary dimensional tolerances
preclude interfacial contact at this point.
This void can account for some electrical
degradation due to condensation of moisture
in the contact area. This can be significant
depending on application and environmental
temperature and humidity ranges. Contact
insulation composed of compression glass
seals must be adequately protected from
welding temperatures when components are
fastened or sealed by this method.

Molded Plastic Connector:

The molded thermosetting resin type of
connector construction is relatively inexpen-
sive and ideally suited to volume production.
It has many of the same advantages as the
all rubber type. For example: It takes fewer
components; integral molding requires no in-
ternal seals; no insulators are required as
the structural material itself is a good dielec-
tric; and the material is not subject to salt
water corrosion, since it cannot form a gal-
vanic couple with adjacent metal parts.

However, experience has indicated that
plastics have many deficiencies as a connec-
tor fabricating material. Any one specific
thermoplastic or thermosetting resin mate-
rial does not seem to combine the desirable
electrical properties with all the required
physical and mechanical properties neces-
sary for use as a deep submergence connec-

349

tor. Some of these properties include a high
degree of dimensional stability, high impact
strength, low mold shrinkage, low water ab-
sorption, high compressive strength and non-
flammability.

Fabricating requirements further limit the
material choice. These include good moldabil-
ity—especially with any necessary reinforc-
ing fiber content—at reasonable tempera-
tures and pressures. Some of the more com-
mon defects found in molded connector parts
include the following: Cracks at points of
high stress which are generated in the mold-
ing process and proliferate with use; threads
that fail under load or are damaged by im-
pact; failure in areas that are molded resin
rich and lack the necessary fiber content;
seal surfaces that do not present the re-
quired finish due to excessive flash or poros-
ity; and a tendency under higher levels of
pressure cycling towards minute fiber dis-
placement, followed by fatigue and eventual
structural failure.

Though the molded plastic connector has
exhibited serious design deficiencies to date,
especially for higher pressure applications, it
is quite possible that the proper combination
of material and design would produce a satis-
factory connector for low pressure applica-
tions.

Molded Elastomer Connector:

The molded or cast elastomer type of con-
nector construction provides the least expen-
sive type of underwater connector. Basically,
this type of connector consists of a length of
cable whose conductors are terminated with
male or female plugs. The entire terminal
area is molded or cast integral with the cable
jacket. The contacts are positioned by exter-
nal means until curing or vulcanizing is com-
plete. The geometry of the molded area is
such as to provide a sealing interface be-
tween plug and receptacle and to provide for
strain transition between contact area and
cable. Because of the resilient qualities of
the material used, relatively thick sections
are required to provide adequate polariza-
tion between plug and receptacle. This re-
sults in a large connector. For this reason,
polarization, where present in this design, is
normally accomplished by contact pattern or
by the use of two or more different contact
diameters. Neither method is adequate be-

cause electrical contact between plug and
receptacle is not possible prior to proper
alignment and mechanical locking. For this
reason, this type of connector is vulnerable
to electrical mismating and contact damage.

The materials most often used in fabricat-
ing this connector are neoprene for pressure
molding and polyurethane for cast molding.
The neoprene molded connector is superior
in several design areas. However, the inabil-
ity to properly control movement of the con-
ductor during the pressure molding process
can lead to electrical opens and shorts that
very often don’t appear until after the con-
nector sees the operating environment.
Thus, reliability is seriously affected.

The all rubber type of connector, not hav-
ing a rigid internal or external structure,
does not provide for positive and controlled
compression of interfacial seals. For the
same reason, most coupling and mounting
devices are marginal because the material is
subject to compression set. Seal failure can
also occur when the connector is mated in a
low temperature environment, due to loss of
elasticity. Most designs have little or no pro-
tection for pin contacts.

This type of connector construction is not
without certain advantages. Among these
are low cost, light weight, capability of with-
standing considerable abuse and, because it
is integrally molded, a need for fewer seals.
Both plug and receptacle withstand open
face pressure equally well. No material cor-
rosion problem exists and the material being
a dielectric does not contribute to galvanic
corrosion of adjacent areas. No separate in-
sulating parts are required and the resilient
material provides for a void-free interface
between mated plug and receptacle.

Underwater Disconnectable Connectors:
Underwater disconnectable, or make and
break, connectors are a definite requirement
for submersible applications. For instance, it
is advantageous for divers to be able to dis-
connect camera and light housings while the
vehicle is still in the water. This allows re-
placement of film and lights on a routine
basis without the need to haul the vehicle
from the water. Another disconnectable con-
nector requirement is the one-time electrical
disconnect that is required when emergency

350

drops are made of outboard mounted equip-
ment such as batteries and manipulators.
These equipments would be disconnected
from the vehicle under conditions of emer-
gency surfacing; it may also be necessary to
drop the manipulators should they become
entangled during underwater operations.

Electro Oceanics has developed and pat-
ented an underwater make and break con-
nector wherein both the male plug and fe-
male receptacle are molded of a nonwetting
elastomer, neoprene, to which the metallic
contacts are bonded (Fig. 7.27). An interfer-
ence fit between plug and receptacle causes
a wiping action as connection is made. By
slightly constricting the front face of the
female opening and slightly flaring the end
of the male, the entire male surface is wiped
clean as is the interior of the female with
excess water or salt film being ejected to the
rear. The purging action is so effective that
the connector can be plugged and unplugged
in salt water with a resultant leakage resist-
ance exceeding 100 megohms.

As one part of the DOT Program, the
Crouse-Hinds Company of Syracuse, New
York, developed an underwater make-break
connector capable of operation at depths to
1,000 feet. A flexible bladder provides volume
compensation for changes due to pressure or
temperature, and a method employing one
active and one dummy rod maintains zero
displacement when connection is made. Tests
to 15,000 psi show no damage to the connec-
tor and subsequent development is aimed at
multicircuit use. A complete description of
this novel approach and its advantages are
presented by Small and Weaver (37).

Prior to completion of the DOT Program’s
Connector, Cable and Harness Handbook,
several manufacturers and users published
state-of-the-art reports of these components
which included recommendations for the fu-
ture and described the techniques employed
on a few specific vehicles. These reports and
articles are included in references (38)
through (42) and are mentioned herein, not
only for historical reasons, but also to give
the views of both users and manufacturers.
A more recent development in penetrators in
Figure 7.28 shows Electro Oceanics’ titanium
penetrator for the 12,000-foot titanium hull
of ALVIN.

Fig. 7.28 ‘PROJECT TITANES.” (WHOI)

Cables

The primary function of a pressure proof
harness assembly is to provide an electrical
interconnection point from the electrical hull
penetrator to the outboard electrical/elec-
tronic component. A harness assembly is a
pressure proof cable with connectors wired
and sealed to each end (Fig. 7.29). The har-
ness is used outboard of the pressure hull

and usually runs from the hull’s electrical
penetrator or outboard distribution box to an
outboard electrical component. Many types
of harness assemblies can be considered and
have actually been used on submersibles
(Fig. 7.30). However, the majority of those
used to date employ rubber jacketed cables.
Metal-sheathed, mineral-insulated cables
have been used on a few European vehicles,
but almost all U.S. designs have made use of
conventional neoprene jacketed cables.
Another output of the DOT program is the
Handbook of Electric Cable Technology for
Deep Ocean Application (44), a guide pre-
pared for deep submergence designers, engi-
neers and operating personnel. The Hand-
book is a compilation of engineering criteria
obtained from literature surveys, experimen-
tal investigations and consultation with
manufacturers, and provides detailed discus-
sions of material selection and construction
requirements for reliable deep-ocean cables.
Additionally, a glossary and a varied collec-

Fig. 7.29 Harness assemblies for DEEP QUEST. (LMSC)

= © a “NON HOSING” OR
cS. WATER BLOCKED” CABLE
ea RUBBER FILLERS
foie ceaeer—eet & NON-WATER BLOCKED
= CABLE
Bi eapeeety || oe
Sa ae CONDUCTOR CABLE
a
oo eee = ° RIBBON CABLE
a

INDIVIDUAL
a = © CONDUCTORS
“FREE FLOODING”
ay CABLE, INDIVIDUAL
a —— Oy CONDUCTORS IN A
POROUS PROTECTIVE
SHEATH (JACKET)

Sa >=
a
—_ NOY CABLE

= ©) INDIVIDUAL
—-— © CONDUCTORS

OIL FILLED PLUG
SILVER SOLDER

eae MINERAL INSULATED
- O-- METAL SHEATH
ee CABLES

(MI-PY ROTENAX)

ae CONDUCTORS IN
a 9) PIPE (OIL FILLED—GAS
FILLED OR W/VOIDS)
ae Sane mee, METAL CORRUGATED
<a SHEATH CABLES
Fig. 7.30 Submersible pressure proof harness types.

352

tion of useful tables are included. Because

the subject of cables is covered exhaustively

in the Handbook and references (31) and (36),

only acursory discussion is given herein, and

it is taken directly from the above sources.

As with so many other components of sub-
mersibles, the selection of outboard cabling
for privately owned vehicles depends both on
the designer’s personal choice and availabil-
ity. Among the options are single insulated
conductors, standard commercial cables, oil
filled cables, welding cable, metal sheathed
cables and hybrid cabling systems. Typical
problems encountered include:

1. Incompatibility of insulation and jacket

compounds with pressure-compensating

fluids.

. Water penetration of cable jackets and
molded plug terminations.

. Cracking of cable sheath.

. Problems of potting plug molding com-
pounds to cable jackets and metal shell
of plugs.

. Conductor breakage at molded plug ter-
minations.

. Instability of electrical characteristics

with change in hydrostatic pressure or

with long-time immersion.

Breakage of braided shields under re-

peated cable flexing.

Mechanical damage during vehicle serv-

icing.

Mr. D. K. Walsh (35) summed up the situa-
tion quite succinctly in a 1966 report to the
Marine Technology Society: ‘“‘Historically,
the cable problem has been treated as an
afterthought.’’ Walsh proceeded to develop a
historical account of cable selection (what-
ever seemed adequate), terminations to asso-
ciated equipment (trial and error) and the
means of connecting equipment to a power
source (whatever method came to mind).
Tracing the evolution of combining cables
and connectors, Walsh described an early
approach known as the “Schlumberger
Splice” (Fig. 7.31) which worked satisfactor-
ily with single conductor cables. From this
developed multi-pin, watertight, disconnect
type connectors (Fig. 7.32) which are essen-
tially throw away units, inexpensive and
rugged and still in use today. These rubber
molded connectors, according to Walsh, had
much to do with combining the cable problem

ee)

lit

8.

353

kd a & J |e

Fig. 7.31 The Schlumberger Splice. (D. K. Walsh)

with the connector problem since a rubber
molded connector could only be installed on
or molded to a vulcanizable type of cable,
e.g., neoprene jacketed. This began the de-
sign of what Walsh calls an Engineered Ca-
ble System: A combination of a cable with a
connector and a suitable junction, for the
development of which the systems engineer
must have full prior knowledge of the associ-
ated connectors and the types of junctions to
be employed. Walsh’s report contains a num-
ber of considerations to insure compatibility
and optimum performance and is one of the
first (if not the first) contemporary attempts
to approach the entire cable/connector prob-
lem in a systematized, soundly engineered
manner.

ed

Fig. 7.32 A variety of rubber-molded disconnect type connectors. (D. K. Walsh)

During the design phase of the U.S. Navy’s
Deep Submergence Search Vehicle (DSSV),
Lockheed Missiles and Space Company rec-
ognized that reliability of so-called standard
(Fig. 7.33) external cabling systems was
questionable at depths of 20,000 feet. Subse-
quently, the Navy funded a design, fabrica-
tion and test program for several types of
pressure-compensated cable systems.

According to Saunders (43), present ca-
bling systems suffer the following deficien-
cies: They are not amenable to analytical
design approach; extensive pressure testing
is needed to prove design; “standard” compo-
nents and assemblies are expensive, large
and heavy; and cable assemblies are difficult
to assemble, repair, inspect and maintain.
The test program was an attempt to over-
come these deficiencies through use of pres-
sure-compensated cables.

Six compensated systems were tested and
the results compared to the DSRV type of
standard cabling system. Briefly, the com-
pensated cable consisted of a Tygon tubing
sheath with bare wire loosely coiled inside.
The various test compensating mediums con-
sisted of a petroleum-based hydraulic fluid,
electrical box silicone fluid, mineral grade oil
and silicone grease. A variety of compensa-
tion devices were used, and each of the six
systems consisted of a junction box with
three cable entries and two cable assemblies

#20 AWG

FILLER
COMPOUND

CONDUCTOR

#0 AWG =
CONDUCTOR

NEOPRENE
JACKET

#16 AWG

CONDUCTOR FILLER
#16 AWG ROD

CONDUCTOR

Fig. 7.33 Typical power cable construction for the DSRV.

354

with a penetrator plug on the end of one
cable.

A wide variety of tests were performed, as
the systems were cycled to 13,200 psi, in an
effort to gain general information rather
than to determine the suitability of one type
of compensated system over another. It is of
interest to note that, except for one leak, all
test specimens met the required perfor-
mance criteria. While Saunders expresses
the need for further study and component
development for specific subsea devices, he
draws the following conclusions regarding
pressure-compensated cable systems: Depth
does not limit their applicability, manufac-
turing costs are lower than for standard
cables, component costs are lower, testing
costs are lower because no pressure testing
should be necessary following qualification
testing, procurement time is reduced, relia-
bility is increased, cable assemblies weigh
less, and measured electrical characteristics
were equal to or exceeded DSRV cabling.
Although the DSSV never progressed beyond
the design stage, many of the experimental
results were unanticipated and the reader is
urged to consult this report for an insight
into this approach to submersible cabling.

As regards reliability of undersea cables,
there is revealing testimony in reference (32)
which supports the earlier manufacturers’
contention that mishandling and misapplica-
tion by the user are chief factors in cable
harness failure. Lockheed’s DEEP QUEST
Program Manager, distressed at the high
damage rate, established training programs
to teach their engineers and technicians the
proper methods of handling and carrying,
what length could remain unsupported with-
out damage, what kinds of containers to use
for shipping and proper in-plant storage pro-
cedures. Additionally, a very rigorous ship-
board inspection program was instituted and
supervised by DEEP QUEST’s Chief Pilot to
assure, among other things, that connectors
were tied tight, that people were not using
connectors or penetrators as steps and that
cables were not allowed to lay loose on the
deck. Similar precautions were taken by
Westinghouse in its DEEPSTAR 4000 pro-
gram.

One problem in small submersibles is that
cables cannot be protected by enclosing them

in a steel trough as they are on the much
larger military submarines. Also, during con-
struction and maintenance periods tools or
other devices may be dropped on them. In
order to stabilize and support the cables of
STAR IIT the “Halo” device shown in Figure
7.34 was used; obviously this is merely sup-
port, not protection.

Junction Boxes

Junction boxes are used to interconnect
wires or cables. On submersibles they are
sometimes within the pressure hull, e.g.,
SEA OTTER, though in many cases they are
external to the hull. In the VAST series of
submersibles there is no junction box what-
ever, because the only electric power lines
are from internal batteries to two electric
propulsion motors.

When junction boxes are external to the
hull, they may be pressure resistant, solid or
compensated. Pressure-resistant boxes are
heavy and penetrations may be costly. In
some cases, however, it may be the only way
to protect components that cannot withstand
high pressure. Solid junction boxes (Fig.
7.35), wherein the electrical equipment is
potted in a block of elastomeric material, is

Fig. 7.34 STAR III's “Halo” cable support. (Gen. Dyn. Corp.)

355

Fig. 7.35 A solid junction box consisting of 1547 amber urethane. (Gen. Dyn. Corp.)

inexpensive and, if transparent, allows easy
observation of the component parts. On the
debit side, access to the components is quite
difficult and water may intrude along pot-
ting-to-component interfaces. Equally frus-
trating is the fact that elastomeric materials
transmit significant shear stresses, and deli-
cate components, thus, may be ruptured or
fatigued by the motions accompanying
compression and decompression. As an ex-
ample, in tests at General Dynamics the
conductors soldered into the pin at the rear
of the receptacles in Figure 7.35 experienced
a number of breaks due to pressure cycling.
Postmortem revealed that the urethane was
compressing and pushing in, and when it
pushed it dragged the conductor along with
it and broke. Subsequent change to a higher
strength conductor and rerouting of the wir-
ing so that it received some support and
protection from the metal frame proved sat-
isfactory.

Pressure-compensated junction boxes offer
advantages for components which can tolerate

pressurization in a dielectric liquid medium.
Dielectric liquids transmit negligible shear
which allows exposure of fragile components.
Since the electrical resistance of all dielectrics
increases with pressure (43), the chance of
spontaneous arcing because of dielectric
breakdown is minimal, thereby providing gre-
ater latitude to the designer of high-voltage
equipment. Other advantages are realized in
weight-saving and visual inspection if opti-
cally transparent dielectric and container
material is used.

Circuit Design

No two manufacturers of submersibles fol-
low the same circuitry design or allocation of
power. Consequently, it would serve little

purpose to present just one or two power
schematic diagrams, for they would be repre-
sentative of only themselves. In the same
vein, very little has been published regard-
ing the philosophy of circuit design, which
leaves the investigator in a quandary if he
wishes to base his design on other than
intuition. For such reasons, the contents of
this section will deal with the manner in
which circuit design and power distribution
should be approached, rather than how it
actually has been carried out. Two sources
are drawn upon for the major portion of this
information: 1) The DOT Handbook on Pene-
trators, Connectors and Harnesses (81) and
2) course notes taken at a short course in
Manned Submersibles at UCLA presented by

COMMUNICATION ANTENNA
HOVERING MOTOR

TRACKING PINGER
AUXILIARY BALLAST TANK SENSOR
MAGNESYN COMPASS
MERCURY TRIM LEVEL SENSOR
RUDDER ACTUATOR BOX
UQC TRANSDUCER

MAIN POWER
DISTRIBUTION
CONTACTOR BOX

PROPULSION MOTOR FUSE BOX

DEPTH TRANSDUCER

BATTERY BOX

PORT & STARBOARD PENETRATORS
FORWARD PENETRATOR

TV CAMERA

QUARTZ-IODINE LIGHT
CABLE CUTTER

BOW CONTACTOR BOX
MERCURY TRIM TANK SENSOR

BOW THRUSTER MOTOR
BOW LIGHT

TV CAMERA
DEPTH TRANSDUCER

Fig. 7.36 Outboard electrical components.

356

Mr. G. Pallange (Lockheed Missiles and
Space) in November 1968.

Obviously, the first order of business for
the circuit designer is to identify and ascer-
tain the electrical characteristics of the com-
ponents (inboard and outboard of the pres-
sure hull) the power source will serve. Table
7.8 presents a listing of voltage and amper-
age requirements of one set of outboard sub-
mersible components and was taken from
reference (31). A graphic representation of
some components in this list is shown in
Figure 7.36 on the STAR IIT; also taken from
the same source. To demonstrate the “untyp-
ical” nature of the component array shown
in Figure 7.36, the VAST or K-250 series of
shallow vehicles (see Chap. 4) has only its
propulsion motors outboard. Other vehicles,
e.g., the DSRV’s, have several times more
than the 25 shown in this figure. Nonethe-
less, with the information presented in Table
7.8, the designer is in a position to develop a

INBOARD

DISTRIBUTION =cENEF
CENTER BREAKER INBOARD
EQUIPMENT

INBOARD

OUTBOARD

FROM OUTBOARD
POWER SOURCE

SENSOR
TO OUTBOARD

LOADS
INTERNAL

TO OUTBOARD |DISTRIBUTION

schematic for both internal and external dis-
tribution as shown in Figure 7.37.

The DOT Handbook (31) offers several con-
siderations regarding the general distribu-
tion system; in part, these are:

—Identify and classify thru-hull conduc-
tors to expedite location and eliminate
cross coupling.

—Examine load levels (high, low, etc.) to
ascertain their potential for electro-
magnetic interference. (This topic is
dealt with in more detail in the following
section.)

—The metallic parts of the vehicle should
not be used to carry electrical power
(i.e., as a ground), thus, power sent out
on one conductor must return on an-
other. In this respect Pallange recom-
mends that switching, isolation and pro-
tective functions be performed on all
wires concerned with the circuit.

ENERGY ENERGY

SOURCE MAIN SOURCE
SHANE ae £
TIE : aa

FEEDER i
BREAKER
GROUP ' ' GROUP
FEEDER = 1 | SESS
BREAKER} OUTBOARD !
aD 1 iBREAKER
CONTROL (is ea AL ae
POWER HULL OUTBOARD OUTBOARD
HULL PENETRATOR SENSOR DISTRIBUTION DISTRIBUTION
PENETRATOR HULL CENTER #1 CENTER #2

HULL
HULL
PENETRATOR

NBOARD INBOARD
DISTRIBUTION
SYSTEM

#2

INBOARD

SYSTEM
#1

EXTERNAL

Fig. 7.37 External and internal schematics of power distribution systems.

357

TABLE 7.8 TYPICAL VOLTAGE AND AMPERAGE REQUIREMENTS
FOR OUTBOARD COMPONENTS ON SUBMERSIBLES

Typical Number of Typical Recommended
Basic Conductors Values Connector
Component Notes Required
Group Volts Amps Size
MOTORS
Main Hydraulic Plant 1 2/2/1 60/60/12 60/2/<1 3N0.4—3N0. 16
Auxiliary Hydraulic Plant 2 2/2/1 60/60/12 110/3/1 3N0.0—3NO. 16
Pod Propulsion 3 2/2/1 60/60/12 85/6/<1 3N0.4—3 NO. 16
Pod Training 4 2/2/1 60/60/12 25/1/<1 3NO.12—3 NO. 16
Main Propulsion 5 2/2 120 20 3 NO. 12 —3 NO. 16
Ext. Hydraulic Pump 6 3/2 440/10 15/<1 5 NO. 16
Thruster 7 3/2 440/10 20/<1 3NO.12—3N0O. 16
Main Propulsion 8 3/2 440/10 45/<1 3NO.8—3 NO. 16
Main Seawater Pump 9 6/2 440/10 15 <1 3NO.16—3N0. 16
Main Propulsion 10 2/2/2 120/240/120/10 15/25/2/<1 3NO. 12 —5 NO. 16
Vertical Thruster 11 2/2/2 120/120/10 15/2/<1 9 NO. 16
CAMERAS
Remote Operated TV 1 4+ 7522 Coax 12 VDC <i 5 NO. 20 — 752 Coax
Remote Operated TV 2 6 + 7522 Coax 12 VDC <1 10 NO. 20 — 7592 Coax
Remote Operated Still 3 3 30 VDC 14 (Peak) 3NO. 16
<1 (Avg.)
Remote Operated Still 4 9 30 VDC 14 (Peak) 9 NO. 16
<1 (Avg.)
Still Camera Strobe 5 3 30 VDC 14 (Peak) 3NO. 16
<1 (Avg.)
Remote Operated Camera
Pan and Tilt Mechanism 6 5 115 VAC 1 5 NO. 20
Remote Operated Camera
Pan and Tilt Mechanism 7 13 115 VAC 1 14NO. 16
Remote Operated Camera
Pan and Tilt Mechanism 8 10 30 VDC 5 14NO.16
COMMUNICATIONS & SONAR
Underwater Telephone 1 See Note See Note 1 3NO. 16
Intercom Telephone 2 See Note See Note 3NO. 16
Radio Telephone Whip Ant. 3 Single Coax See Note a1 50 Q2 Coax
CTFM (Continuous Transmission
Frequency Modulated) Sonar 4
Training Mechanism 5 12 115 VAC 1
Transmitting Hydrophone 6 See Note 500V, P-P <1 5 NO. 20
Receiving Hydrophone 6 See Note 10V, P-P <1 3 NO. 16
Sonar Echo sounder 7
Pressure Hull To Transmitter
Can 6 30 VDC 1
Transmitter Can To Hydrophone 6 See Note 500V, P-P <1 3.NO..16
Doppler Navigator Sonar
Transmitting Hydrophone 8 See Note 500V, P-P i) 5 NO. 20
Receiving Hydrophone 9 See Note 10V, P-P a 10 NO. 20

358

LIGHTS
Underwater Floodlamps

Mercury Vapor 1 3
Tungsten — lodide 1 2
Tungsten — lodide 2 2
Tungsten — lodide 3 2
Tungsten — lodide 4 2
Navigation Running 7 2
Identification Flashing
Beacon 5 2
Strobe, Photographic 6 4

a

MISCELLANEOUS

Anchor Payout Solenoid 2
Ballast Release Solenoid 2
Single Motion Actuator
For Various Equipments 72
For Various Equipments 2
For Various Equipments 2
Mechanical Arm (Manipulator) 1
Open Loop Control 62
Closed Loop Control 74
Emergency Guillotine 2,3 2+2

eee

TRANSDUCER CIRCUITS
Seawater Leak Sensing Probe

Shaft Tachometer Generally
Pressure Twisted Pair,
Temperature Shielded. May
Salinity Have Special
Rudder Angle Requirement
Dive Plane Angle Depending on
Propulsion Pod Angle Application
Ammeter Shunts And/Or
Voltmeter Leads Manufacturer

NOTES AND COMMENTS TO TABLE 7.8

NOTES: (MOTORS)

1. DC Shunt, Armature/Field/Seawater Leak Probe; 3 hp
DC Shunt, Armature/Field/Seawater Leak Probe; 6.8 hp
DC Shunt, Rev., Field Control; Arm/Field/Probe; 4 hp
DC Shunt, Rev., Arm/Field/Probe; 1.5 hp .

DC Series, Rev., Pulse Width Speed Control;
3@ AC, Motor Power/Tachometer

Co 5 GS) i)

—With AC circuits a two-or-three conduc-
tor path twisted pair is the best available
configuration to cancel the alternating
magnetic field from each conductor.
Magnetic and electrostatic shielding may
also be required. Physical separation of
conductors to reduce alternating fields
would be almost impossible.

359

110 VAC 10 3NO. 16
110V, AC/DC 10 3. NO. 16
110V, AC/DC 5 3. NO. 16
228V, AC/DC 1 3 NO. 16
30V, AC/DC 25 3.NO. 12
110V, AC/DC 1 3 NO. 16
110 VAC 1 3 NO. 16
28 VDC 14 (Peak) 5 NO. 16

110 VAC 1 3 NO. 16
60 VDC 1 3.NO. 16
30 VDC 3 3. NO. 16
60 VDC 1 3NO.16

110 VAC 1 3NO. 16

24 VAC/DC 1 24 NO. 16

24 VAC/DC 1 24 NO. 16

30 VDC See Note 5 NO. 20

These Probes Are

Usually Powered

From The Inboard

Device They Are 5 NO. 16 or 5 NO. 20
A Part Of.

Typical Values

Are Currents In

Milliamperes And

Voltages Less Than 10.

—Inductive loads on DC power require spe-
cial switch and circuit breaker considera-
tions. Separation of conductors could
possibly make a normally resistive load
inductive. If the conductors were sepa-
rated by several feet, a single turn loop
of considerable area and significant in-
ductance could be formed, but the loop

NOTES AND COMMENTS TO TABLE 7.8 (Cont.)

7. 3dAC, Rev., Speed Control By Variable Voltage; Motor Power/Tach.

8. 3@AC, Rev., Speed Control By Variable Frequency; Motor Power/Tach.

9. 3HAC, 2-Speed, By 2 Winding Sets; 2 or 10 ph; Motor Power/Tach.

10. DC — Shunt, Rev., Speed Control By Arm. Volts And/or Field; Arm/Field/Tach.
11. DC — Shunt, Rev., Speed Control By Field Resist; Arm/Field/Tach.

NOTES: (CAMERAS)
1. Remotely Controlled Focus
2. Remotely Controlled Focus, ZOOM, and Iris
3. Remotely Controlled Trigger Function Only; 14 Amp Max. Recharge; 3 Sec Recycle
4. Remotely Controlled with Trigger, Iris Focus, and Shutter Special Optical
5. Remotely Controlled Trigger Function
6. PAN And TILT Functions Only
7. With Additional Options: Orientation and Limit Indicators
8. DC Operated Option With Stepping Motors; 5 amp Peak Current During Stepping Pulse.

NOTES: (COMMUNICATIONS & SONAR)
1. Cable Usually Twisted Pair With Shield; Volts About 950 Peak to Peak On Audio Peaks
Cable Usually Twisted Pair With Shield; Volts About 10 Peak to Peak on Audio Peaks
. Voltage Typically 150 Peak To Peak (Radio Frequency) With 50 ohm System.
. Side Scan Or Obstacle Avoidance
3 Cables; 4 Conductors Each
. Twisted Pair With Shield
. BETHOS 2670; With Outboard Transmitter Can and Hydrophone
. 3 Conductors, Shielded; TTS4 SHL Recommended
. 4Shielded Pairs; TTRS4 SLL Recommended

CHMHIUMH PWN

NOTES: (LIGHTS)
1. 1000 Watts
2. 500 Watts
3. 75 Watts
4. 750 Watts
5. For Larger Vehicles With AC As Main Source, Smaller Vehicles Utilizing Battery Power Generally Use a Self-Contained, Pressure
Activated Flasher.
6. Usually Supplied with 4 Terminal Underwater Connector; 14 amp Peak Recharge Current After Flash.
7. These Lights Usually Originate From Support Vessel and Are Removed For Diving.

NOTES: (MISCELLANEOUS)

1. Electrically Controlled Hydraulic Powered Operators
2. Emergency Devices Usually Have Qual, or Redundant Functions For Safety.
3. Explosive Operated Devices Require 30 amp Pulse, Low Resistance Circuit.

Projected Future Electrical Requirements Are Covered By:
3 #0000 — For Propulsion Motor and Battery Connectors.

Single Contact
#16, 12, 8, 4,0 and 0000 — For Applications Where Single Conductor Cables Are Used Outboard or Are Projected For Future Use.

360

could prove to be most troublesome dur-
ing switching operations and, in addi-
tion, would generate a substantial mag-
netic field which could be fatal for other
devices, such as magnetic compasses and
magnetometers.

—Another area sometimes overlooked is
the desirable separation of conductors
capable of carrying high level fault cur-
rents from conductors attached to explo-
sive-operated devices. A high fault cur-
rent could possibly induce a firing cur-
rent in the explosive squib and could
prematurely activate some system.

The foregoing considerations define the
tasks involved in the power distribution de-
sign. In general, the following recommenda-
tions are offered for these applications:

—The connector or hull penetrator must
have a power rating in excess of the
maximum fault current which may flow
through the respective circuit as limited
by circuit protective devices.

—On all DC power circuits each polarity
should be taken through separate con-
nectors or penetrators.

—AC power circuits, especially three-phase
440 VAC, for example, should be carried
through a single nonmagnetic penetra-
tor or connector. Before attempting to
separate these conductors into separate
penetrators or connectors, a hard look
would have to be taken at the inductive
heating effects of these conductors sepa-
rated by magnetic materials, since detri-
mental, or even destructive, heating of
these materials could occur. If nonmag-
netic materials are used in the magnetic
field between conductors, the heating ef-
fect would be greatly reduced. However,
eddy current heating in any electrically
conductive material would still remain a
possibility.

—Circuits susceptible to noise or interfer-
ence should not be routed through a
connector or penetrator which carries
power and control circuits.

Regarding external distribution specifi-
cally, the importance of connectors (between
energy source and external distribution box)
capable of carrying the maximum fault cur-
rent generated by the energy source is em-
phasized. The group feeder breakers (Fig.
7.37) provide added connector protection be-

361

tween the external distribution center and
the vehicle and the hull penetrator. In se-
lecting suitable sensing devices on the tie
and feeder breakers, the rating of the con-
nectors used in these areas must be suffi-
cient to handle the maximum fault amperage
which may flow prior to tripping a particular
breaker. The DOT Handbook further cau-
tions that penetrators through the hull
should be protected by circuit protective de-
vices to reduce the possibility of damage.

As an aid in providing design guidelines,
component specifications and selection crite-
ria for circuit interruption devices, the DOT
Program undertook to produce reference
(45), the emphasis of which is almost entirely
on the use of on-off mechanical contactors in
pressure-compensating fluids. The author,
Pocock, states that subsequent editions will
include additional chapters on circuit break-
ers, solid state circuit interrupting devices
and fuses.

INSTRUMENT
INTERFERENCE

A great proportion of the instruments on
contemporary submersibles are electronic
and thus susceptible to electric interference
which can degrade their performance by
blanking out data or generating erroneous
data. Many of the instruments may be
classed as electroacoustic, which are also
subject to acoustic interference. Regarding
this problem, Mr. K. R. Haigh of the Admi-
ralty Experimental Diving Unit, Ports-
mouth, states (46):

“The presence, origin and nature of
electrical and acoustical interference
in the majority of current submers-
ibles has received scant attention from
the owners and operators with the
result that many users have been una-
ble to realize the full potential of the
boat in its scientific or survey role.”

Haigh further reflects that such interfer-
ence is not a new problem but is one that has
been solved before in military submarines,
and he attributes its existence in submers-
ibles to lack of dissemination or suppression
methods to civilian submersible builders. To
appreciate that such interference can be a

severe problem, one has merely to glance at
Figure 7.38 which shows portions of a side
scan sonar record from ALUMINAUT. Vir-
tually every electronic component aboard
the vehicle, including the scientific instru-
ments themselves (stereo camera system),
produced an interference pattern on the rec-
ord which partially or completely obliterated
the returning echoes from the sonar’s trans-
ducers. ALUMINAUT is not alone in this
problem; to a greater or lesser degree all
submersibles exhibit electrical and/or acous-

STEREO CAMERA SYSTEM

TRANSPONDER TICS

tic interference. Because this problem has
such an impact on the scientific and survey-
ing potential of submersibles, its nature and
the means of suppression, as discussed by
Haigh, are summarized in some detail.
Acoustic sources of interference may be
mechanical, hydraulic or pneumatic in origin.
These are considered so basic as to constitute
design error. The chief consideration, there-
fore, is given to other types of acoustical as
well as magnetic and electrical interference.
Figure 7.39 presents their origin and nature.

Sy oa
Bs sh

®

‘

& x
eee 8 N
BAL Baye
a
& *
e
N
aaa
N
»
Be ge rep Hae eg
;

a x

‘

:

EVENT
MARKS

EXAMPLES OF ELECTRONIC INTERFERENCE ON SIDE SCAN SONAR RECORDS

Fig. 7.38 Examples of electronic interference on side scan sonar records. (NAVOCEANO)

ERRONEOUS OBLITERATED RESTRICTED

DATA INFORMATION DISPLAY

ELECTRICAL INTERFERENCE

ELECTROSTATIC
LINE EFFECTS

ELECTROMAGNETIC

RADIATED COUPLED FEED GROUND

SIGNAL PROCESSING CIRCUITRY
INPUT CIRCUITS

SIGNAL
MAGNETIC

ELECTRICAL
ACOUSTICAL

SELF NOISE

HYDRODYNAMIC] PROPELLER

POWER SUPPLY TRANSIENTS

THERMAL NOISE

TRANSDUCER
MAGNETIC ELECTRICAL ACOUSTIC

ACOUSTICAL INTERFERENCE

SEA NOISE RADIATED NOISE

HYDRODYNAMIC

PROPELLER OTHER OTHER
EAE HOES MACHINERY ACOUSTIC MACHINERY ACOUSTIC
DEVICES DEVICES
STRUCTURAL AIRBORNE STRUCTURAL AIRBORNE

Fig. 7.39 Origin and effects of acoustical and electrical interference. [From Ref. (45)]

Acoustic Interference

Three types of acoustical interference can
find their way into signal circuits and conse-
quently lower the signal-to-noise ratio: Sea
Noise, Self Noise and Radiated Noise.

a) Sea Noise:

In an acoustical system free of other
noise sources, sea noise is the background
against which signals must be detected. The
origin of the noise may.be due to thermal
agitation of the water molecules, seismic ac-
tivity, surface and sub-surface traffic and
sea surface motion which is dependent on
wind speed. In coastal waters additional con-
tributions are received from waves breaking
on the shoreline, turbulence around obstruc-
tions and noise from marine life. Because sea
noise is always present and must be ac-
cepted, Figure 7.40 is taken from Haigh’s
report and indicates the background sea
noise for various sea states; these levels are
expressed in a 1-Hz bandwidth so they must
be increased by 10-log bandwidth to arrive at
the interfering pressure level.

363

b) Self Noise:

Self Noise is that produced by the vehi-
cle itself (propellers, machinery, hydrody-
namic) and picked up in its own transducers
or hydrophones. The submersible user
should also be aware that noise from its own
support ship can also be detrimental to func-
tions such as communications and tracking
and must also be considered.

ALUMINAUT

1 1
yp =
6 6

—30

1
a
}

—50

— 60

1
3

SPECTRUM LEVEL Dg rel dyne/Cm2

1
©
Ss

—90

0.1

10

FREQUENCY kHz

Fig. 7.40 Background sea noise under various sea state. [From Ref. (45)]

1) Propeller Noise —Noise produced by the
collapse of bubbles created by the
propeller rupturing (rotating in) the
water. The point of inception of cavi-
tation depends on propeller speed
and depth. Generally, submersibles
have small, high speed propellers
and cavitation sets in at slow vehicle
speeds; however, the effect of depth
is to reduce the point of inception
and to move the noise spectrum to-
ward the higher frequencies.
Machinery Noise —Noise emanating
from machinery and transmitted
through the structure induces pres-
sure waves. Unless precautions are
taken reciprocating and rotating ma-
chinery of any type will produce vi-
brations which can be transmitted to
the hull structure. Electrical trans-
formers and chokes can also produce
structural vibrations. Structural vi-
brations can be minimized by mount-
ing all rotating and vibrating ma-
chinery on rubber mounts and ensur-
ing that there is no mechanical cou-
pling between the machine and the
structure. In hydraulic and pneu-
matic systems this entails the use of
flexible pipe couplings, while in elec-
trical circuits no conduits should be
firmly secured to both the machine
and hull.
Hydrodynamic Noise —Noise originating
from the flow of water across the
face of a hydrophone or turbulence
around some protuberance on the
vessel. At the slow speeds of sub-
mersibles this should not be a prob-
lem, except perhaps in those vehicles
propelled by water jets.

c) Radiated Noise:

The sources of radiated noise are identi-
cal to those of self noise and the cure in
many cases is the same. If radiated noise is
present to any extent it may be assumed
that the vessel has self noise problems.

3

Wm

Electrical Interference

Electrical interference is of three types:
Electromagnetic, line effects and electro-
static. All can be induced directly or indi-
rectly into signal processing circuits and

364

must be suppressed to a level less than that

of sea noise, which is considered the practical

background against which sensors operate.
a) Electromagnetic Interference:

When currents pass through conduc-
tors, magnetic and electrical fields are
formed around the conductors as in Figure
7.41. The magnitude of interference depends
upon field strength, field geometry, the rate
of change of field and frequency and the
susceptibility of the receiving circuit. Haigh
divides electrical interference into radiated
and coupled. The difference is slight and
resides merely in the physical separation of
the transmitting and receiving elements.
Coupled interference is characterized in Fig-
ure 7.41a as both magnetic and electric ra-
diation between two cables running side by
side or between cores in a multi-core conduc-
tor. Conventional cable shielding methods
can contain the electric field as shown in
Figure 7.41b, but either exotic shielding or
complete separation of power supply cables

ELECTRIC FIELD

MAGNETIC FIELD

a/FIELDS BETWEEN TWO CONDUCTORS

ELECTRIC FIELD
CONTAINED IN
CONVENTIONAL
SHIELD
b/SHIELDING OF FIELDS

MAGNETIC FIELD
NOT CONTAINED
BY SHIELD

Fig. 7.41 Electromagnetic radiation (a), and the effects of conventional Shielding (b).

from sensitive instrument circuits is re-
quired to isolate electromagnetic fields.
Sources of radiated interference include
transformers, inductors and cables operating
at frequencies from zero to the radio commu-
nication spectrum. Other sources are invert-
ers, converters (DC to DC), and fluorescent
lighting. Protection includes encasing low
level cables in solid drawn steel conduits, as
well as conventional shielding. An example
of one source of coupled intereference is
shown in Figure 7.42 wherein the close prox-
imity of cables seems to make such interfer-
ence inevitable. Further problems with such
a layout is that of identifying various cables
and protecting them from physical destruc-
tion.

b) Line Effects:

These encompass unexpected tuning ef-
fects of cables and associated equipment
which cannot be completely anticipated in
the design stage and arise during installa-
tion and the effects of grounding upon inter-
ference suppression. Haigh separates these
into feedback and ground loops and suggests
various remedies, e.g., filters and grounding,
to ameliorate their effects.

c) Electrostatic Interference:

Electrostatic interference arises chiefly
from the movement of cables or machinery
rubbing against cable sheaths. Should the
submersible be concerned with towing a low
level sensor, or derive its power from a sur-
face umbilical, then the action of the cable

Fig. 7.42 ALUMINAUT's internal junction boxes. (NAVOCEANO)

strumming under tension can give rise to
friction in the insulation and the creation of
an electrostatic field. This problem may be
overcome by using a cable insulant loaded
with a small amount of graphite.

The subject of eliminating or suppressing
the interference discussed above is dealt
with in greater detail in the DOT Handbook
on Cable Technology (44); the designer is
referred to this and Haigh’s work for a thor-
ough and comprehensive review.

REFERENCES

il:

bo

10.

11.

Cohn, P. D. & Wetch, J. R. 1969 Power
Sources. in Handbook of Ocean and
Underwater Engineering. McGraw-Hill
Book Co., N.Y., p. 6—2 thru 6=32.

. Rynewicz, J. F. 1970 The submersible

DEEP QUEST, A step forward in Off-
shore Technology. Offshore Tech. Conf.,
of 22-24 April 1970, Houston, Tx., Paper
No. OTC 1199.

. Louzader, J. D. & Turner, G. F. 1966

Power under the sea. Trans. Mar. Tech.
Soc. Conf., Exploiting the Ocean. p. 424-
433.

. Bodey, C. E. & Friedland, N. 1966 Naval

architecture of submarine work boats
for offshore work. Proc. of Ocean Explo-
ration Conf., 1966, p. 105-119.

. Panel on Energy Sources, Committee on

Undersea Warfare, National Research
Council 1968 Energy Systems Endurance
in the 1-100 Kilowatt Range for Under-
sea Applications. Nat. Acad. Sci. Pub.
1702, Wash., D.C., 132 pp.

. Penzias, W. & Goodman, M. W. 1973 Man

Beneath the Sea. Wiley-Interscience.
John Wiley & Sons, Inc., N.Y., 831 pp.

. Howard, P. L. 1964A novel technique for

predicting battery performance. Product
Eng., 26 Oct., 8 pp.

. Kisinger, W. W. 1965 Propulsion of deep

diving submersibles. Naval Eng. Jour.,
Aug., p. 573-584.

. Horne, R. A. 1963 The operation of bat-

teries at great ocean depths. Undersea
Tech., July, p. 16-18.

Yeaple, F. D. 1965 Dry Cell performance.
Prod. Eng.

Work, G. W. 1969 Battery Materials and
Characteristics—Effects of the Deep-Sea

366

12.

13.

14.

15.

16.

Wf

18.

i).

20.

ole

Environment on Materials Performance
and the Deep Sea. ASTM STP 445, Amer.
Soc. of Testing and Materials, p. 31-40.
Funao, Y., Nakamura, K., Kawai, I. &
Hosoi, 8. 1972 Oil-filled silver-zinc sec-
ondary batiery for deep submersible.
Preprints 2nd International Ocn. Dev.
Conf., Oct. 5-7, 1972, Tokyo, v. 1, p. 853-
869.
Momsen, D. F. & Clerici, J. 1971 First
silver-zinc batteries used in deep sub-
mergence. Mar. Soc. Tech. Jour., v. 5, n. 2,
p. 31-36.
Work. G. W. 1972 Batteries for deep
ocean application. Preprints 8th Ann.
Conf. & Exhibition, Mar. Soc. Tech. Jour.,
Wo Dy 15 745 195 alata},
Anderson, A. G., Wright, C. P. & New-
man, J. P. 1970 Capsulating energy sys-
tems for small submersibles. 2nd Ann.
Offshore Tech. Conf., Houston, Tx., April
22-24, 1970, Paper No. OTC 1164.
Evans, R. S. 1968 Compensation for out-
board batteries on research submarines.
Trans. Mar. Tech. Soc. 1968, A Critical
Look At Marine Technology, p. 643-649.
Marriott, J. A. & Capotosto, A., Jr. 1968
The gassing behavior of lead-acid stor-
age batteries in oil compensated sys-
tems. I. Studies at atmospheric pres-
sure. Trans. Mar. Tech. Soc., A Critical
Look At Marine Technology, p. 651-660.
1968 The gassing behavior of
lead acid storage batteries in oil com-
pensated systems. II. Studies at elevated
hydrostatic pressures. Ibid., p. 661-670.
Miron, D. B. & Evans, R. S. 1966 Analysis
and Specification Compensation Vol-
ume and Parameters for AUTEC Vehi-
cles External Battery Systems. Gen.
Dyn./Elec. Boat Rept. U413-131.
McQuaid, R. W. & Brown, C. L. 1969
Handbook of Fluids and Lubricants for
Deep Ocean Application. NSRDC Pub.
MATLAB 360, 176 pp., revised 1972.
Loughman, R. & Butenkoff, G. 1965 Fuel
Cells for an underwater research veht-

cle. Undersea Tech., Sept. 1965, p. 45-46.

. Anderson, A. G. 1970 Summary of a pres-

entation on ““PROJECT POWERCEL’’.
Trans. Mar. Tech. Soe. 1970, v. 2, p. 1103-
1109.

23.

24.

25.

26.

27.

28.

29.

30.

bl.

32.

33.

34.

Warszawski, B., Verger, B. & Dumas, J.
1971 Alsthom fuel cells. Mar. Tech. Soc.
Jour., v. 5, n. 1, p. 28-40.

McCartney, J. F. 1970 Hydrospace fuel-
cell power systems. Trans. Mar. Tech.
Soc. 1970, v. 2, p. 879-907.

Cohen, S. & Wallman, H. 1970 Engineer-
ing evaluation of the applicability of
fuel cell systems to deep submersibles.
Trans. Mar. Tech. Soc. 1970, v. 2, p. 1401-
14238.

Fukunaga, P. R. & Pearson, R. O. 1971
Closed-Cycle Power Systems For Under-
sea Military Facilities and Equipment.
Prepared for the U.S. Naval Civil Engi-
neering Laboratory, under contract
N62399-71-C-0027 to TRW Systems
Group.

Giorgi, E. 1968 Underwater power sys-
tems. Jour. Ocean Tech., Mar. Tech. Soc.,
Wo Pan ile 25 1s BUSING

Watson, W. 1971 The design, construc-
tion, testing, and operation of a deep-
diving submersible for ocean floor ex-
ploration. Trans. of the Ann. Meeting of
the SNAME, 11-12 Nov. 1971, N.Y., p.
405-437.

Sasaki, T. 1970 On underwater observa-
tion vessels in Japan. Trans. 6th Ann.
Conf. & Exhibition Mar. Tech. Soc., 29
June—1 July 1970, Wash., D.C., v. 1, p.
227-237.

Hoffman, L. C., Rudnicki, M. I. & Wil-
liams, H. W. 1970 Psychrocycle. Mar.
Tech. Soc. Jour., v. 4, n. 6, p. 47-56.

U.S. Naval Ship Engineering Center 1971
Handbook of Vehicle Electrical Pene-
trators, Connectors and Harnesses of
Deep Ocean Applications. Deep Ocean
Tech. Program, Hyattsville, Md.
“‘Meeting on Cables, Connectors and
Penetrators,”’ text of presentations and
general discussion held at Deep Submer-
gence Systems Project Office, Bethesda,
Md., 15-16 Jan. 1969.

Haigh, K. R. 1968 Deep-sea cable-gland
system for underwater vehicles and
oceanographic equipment. Proc. IEE, v.
15 eps bo—llp ie

Tuttle, J. D. 1971 Underwater electrical
integrity. Preprints 7th Ann. Conf., Mar.
Tech. Soc., 16-18 Aug. 1971, Wash., D.C.,
p. 135-145.

367

36.

37.

38.

39.

40.

41.

42.

43.

44,

45.

. Walsh, D. K. 1966 Underwater electrical

cables and connectors engineered as a
single requirement. Exploiting the
Ocean, Mar. Tech. Soc., p. 469-484.

Department of the Navy, Deep Submer-
gence Systems Office 1969 Meeting on
Cables, Connectors and Penetrators for

Deep Sea Vehicles, 15-16 Jan. 1969, 383

pp.
Small, F. B. & Weaver, R. T. 1971 Under-
water disconnectable connector. Pre-
prints Mar. Tech. Soc. 7th Ann. Conf., 12-
18 Aug. 1971, Wash., D.C., p. 125-133.
Haworth, R. F. & Regan, J. E. 1964 Wa-
tertight electrical connectors for under-
sea vehicles and components. Ann. Win-
ter Meeting ASME, N.Y., Nov. 29—Dec.
4, 1964, Paper 64-WA/UNT-10, 12 pp.
1965 Watertight electrical ca-
ble penetrations for submersibles—past
and present. Ann. Winter Meeting
ASME, N.Y., 7-11 Nov. 1965, Paper 65-
WA/UNT-12, 8 pp.
Haworth, R. F. 1966 Electrical cable
system for the STAR III vehicle. Ann.
Winter Meeting and Energy Systems
Expo ASME, N.Y., 27 Nov.—1 Dec., 1966,
Paper 66—-WA/UNT-11, 5 pp.
O’Brien, D. G. 1967 Application of glass-
hermetic-sealed watertight electrical
connectors. Mar. Tech. Soc. 3rd Ann.
Conf. and Exhibit, San Diego, Calif., 5-7
June 1967, p. 667-705.
Patterson, R. 1969 Electrical connec-
tors—the weakest link? Oceanology In-
ternational, Jan/Feb 1969, p. 40-43.

Saunders, W. 1972 Pressure-compen-
sated cables. Preprints Mar. Tech. Soc.
8th Ann. Conf. and Exhibition, 11-13
Sept. 1972, Wash., D.C., p. 23-38.

Forbes, R. T., Delucia, M. A. & Behr,
S. H. 1970 Handbook of Electric Cable
Technology for Deep Ocean Applica-
tion. U.S. Naval Ship Research and De-
velopment Laboratory, Annapolis, Md.,
24 pp.

Pocock, W. E. 1971 Handbook of Electri-
cal and Electronic Circuit Interrupting
and Protective Devices for Deep Ocean
Application. U.S. Naval Ship Research
and Development Center, Wash., D.C., 74
pp.

46. Haigh, K. R. 1970 Instrumentation inter- June—1 July 1970, Wash., D.C., v. 2, p.
ference in submersibles. Preprints 6th 1189-1201.
Ann. Conf. and Expo. Mar. Tech. Soc., 29

368

MANEUVERABILITY AND CONTROL

The ability of submersibles to maneuver
and the means of controlling or directing
them undoubtedly represent the widest de-
sign departures from the military subma-
rine. BEAVER was designed to work primar-
ily on engineering tasks. Therefore, the basic
requirements were for tightly-controlled,
small scale movements which could place it
in a position to employ its tool kit while
hovering and maintaining a constant posi-
tion in midwater. DEEP QUEST was in-
tended for various tasks: It could range
about for moderate distances, maneuver
adroitly and, if required, assume virtually
any attitude necessary to mate with an un-
dersea object. Vehicles of the BEN FRANK-
LIN and ALUMINAUT variety were survey-

369

ors in the fashion of Lewis and Clark. They
could range over long distances, maneuver to
pick up large quantities of samples and carry
a vast array of equipment. Smaller submers-
ibles, such as SP-350, Perry’s CUBMARINEs
and General Oceanographic’s NEKTONSs,
were designed for short duration scrutiniz-
ing and sampling in narrow canyons and
along steep cliffs, as well as cruising along
flat or gently sloping surfaces.

One of the more ingenious and imaginative
aspects of manned submersibles is the vari-
ety of approaches taken to achieve the de-
sired maneuverability. Virtually all have ob-
tained a high degree of maneuverability with
only a handful following similar approaches.
Within this chapter the means employed to

propel, maneuver and control submersibles
is reviewed. No attempt is made to catego-
rize the various approaches, because the ex-
treme variation from vehicle-to-vehicle de-
fies classification.

There is one general statement regarding
submersible propulsion which can be made:
They are all slow and they all use electric
power. Although it may be satisfying in a
literary sense, no submersible “darts about”
or “speeds off’ on its appointed rounds. As
Cousteau so aptly stated in The Living Sea,
“Speed is the enemy of observation.” This
philosophy has been adopted by submersible
designers. Averaging the cruising speed of 80
submersibles produces a value of 1.5 knots,
with a range from 0.2 knot (FNRS-2) to 6
knots (AUGUSTE PICCARD). One and a half
knots is equivalent to a casual stroll, and
this has been quite acceptable to the under-
sea scientist and engineer. The only need for
higher speed appears to be on the part of the
pelagic fisheries’ biologist who desires to ob-
serve the migration and behavior of fast
swimming fish, such as tuna. To this end
General Dynamics conducted a feasibility
and conceptual design study of a research
submarine for the Department of Interior’s
Bureau of Commercial Fisheries (now the
National Marine Fisheries Service) and rec-
ommended a maximum submerged speed of
20 knots. Nothing further has evolved from
this study, which was completed in 1965 (1).

In the submersible field the term maneu-
verability has a variety of meanings; it re-
fers, not only to the vehicle’s ability to twist
or turn, but also implies its ability to climb,
hover and poke around in close quarters. The
requirements for maneuvering at times can
be quite severe—on a surveying mission, for
example, where ascent (at a constant height
of 10-30 feet above the bottom) from several
thousand feet deep to a hundred feet or less
may be required. The submersible must be
able to “fly” horizontally, then assume an
up-bow angle of 30 or more degrees and
finally ascend vertically while maintaining a
position some 2 or 3 feet away from the face
of a vertical escarpment. Such requirements
are not hypothetical; ALUMINAUT con-
fronted just this problem while bottom sur-
veying off Vieques Island, Puerto Rico and
St. Croix, U.S. Virgin Islands, in 1967 and

370

1968. ALVIN confronted similar problems in
the Tongue of the Ocean, Bahamas in 1966
and 1967. These are but a few examples.
Other submersibles faced and continue to
face equally taxing demands on their maneu-
verability and control. The problem is not too
different from those of a helicopter. While
ocean bottom currents do not nearly ap-
proach the wind speeds encountered by a
helicopter, submersible power plants are so
much less than a helicopter’s that the prob-
lems are quite comparable.

The topics of marine propulsion and hydro-
dynamics are subjects which comprise books
in themselves. Their terminology and princi-
ples are multitudinous and complex. Herein,
discussion is confined to the minimum of
terms and principles needed to describe the
motions of a submersible and the devices and
physical phenomena which propel and direct
it through the water. In the event that a
more thorough or technical treatise is de-
sired, the following are recommended:

a) “‘Marine Propulsion” (2): A historical
and semi-technical presentation which
describes and illustrates the develop-
ment of marine propulsion throughout
the ages.

“Stability and Motion Control of
Ocean Vehicles” (3): A very thorough
and highly technical discussion of the
hydrodynamic principles involved in de-
signing vehicles and systems and deter-
mining their response to the environ-
ment. This publication was written as a
“partial” text on the subject of motion
and control of ocean vehicles offered by
the Department of Naval Architecture
and Marine Engineering at the Massa-
chusetts Institute of Technology.

‘“‘Naval Hydrodynamics”: A series of
seven publications from 1957 through
1968 presenting the reports of interna-
tional scientists and engineers regard-
ing marine propulsion, cavitation, noise,
hydroelasticity, motions, drag and other
aspects of marine propulsion. The con-
tents of these books are quite technical,
comprehensive and far ranging. A list-
ing of the books and their contents can
be obtained from the National Technical
Information Service, Operations Divi-
sion, Springfield, Virginia 22151.

b

wm

ww

Cc

d) ‘‘Water, Air and Interface Vehicles”
(4): Similar to reference (3) in purpose
and technical detail, this publication
discusses hydrodynamic forces and pro-
pulsion for airborne and waterborne ve-
hicles on a common plane.

*‘Principles of Naval Architecture” (5):
A textbook which covers all static and
dynamic aspects of naval architecture,
both theoretical and applied. The book
concentrates on merchant ships, but in-
cludes discussion of submarine hydrody-
namics and design. A knowledge of cal-
culus, applied mechanics and theoretical
and applied fluid mechanics is a prereq-
uisite.

Of the above publications reference (3) con-
cerns itself most directly with submersibles,
although other problems are addressed. In
addition to these there are a variety of re-
ports, both technical and non-technical,
which are referenced throughout this text.

PROPULSION AND
MANEUVERING

Ideally there are six degrees of freedom
(motion) desirable in the control of a sub-
mersible; these are shown in Figure 8.1 rela-
tive to an X, Y and Z axis and are classified
as translational and rotational motions.

~—

e

Fig. 8.1 Translational and rotational motions.

371

Translational motions occur when every
point of the submersible has simultaneously
the same speed and direction of motion.
These are Heave (vertically up/down), Surge
(forward/backward) and Sidle or Sway (lat-
erally left/right).

Rotational motions occur around a center
point or axis. These are Yaw (rotation
around a vertical axis), Roll (rotation around
the principal longitudinal axis) and Pitch
(rotation around the principal transverse
axis).

To varying degrees and through a variety
of means, both translational and rotational
motions, both singly and together, are ob-
tained by most contemporary submersibles.

To acquire any or all of the six motions, a
submersible requires a component to propel
it and another to change its direction. In the
most basic arrangement, a screw-type pro-
peller provides forward/reverse translational
movement (surge), a rudder provides left/
right movement (yaw) and a movable plane
or wings provide up/down (pitch) rotational
movement. We treat first the devices that
overcome the submersible’s inertia, or make
it move. These are: Free propellers, ducted
propellers, Kort nozzle propellers, cycloidal
propellers and water jets. Next we examine
the devices that change its course or atti-
tude. These are: Rudder and planes, thrus-
ters and trim control.

PROPULSION

Free Propellers

The simplest means of submersible propul-
sion is the screw propeller (Fig. 8.2). In con-
cept, the propeller can be thought of as
screwing itself through the water—analo-
gous to tapping a screw into a solid material
where the rate of advance distance for each
revolution is equal to the pitch of the thread.
In practice, however, a screw propeller in
water does not advance at a speed pn (pitch
x revolutions) per unit time. Instead, it trav-
els at some lesser speed which is a function
of the propeller slippage with each revolu-
tion. Thus, if a propeller having a pitch of 10
feet turns at 200 rpm, it would advance 2,000
feet in 1 minute in a solid; it does not do so in
water because of slip, the difference between

Fig. 8.2 Free screw-type propeller

the distance it would advance in a solid
substance and the actual distance traveled,
expressed as a percentage of the former.
According to Taggert (6), the screw propeller
is the most efficient means of obtaining pro-
pulsive force, and when used at its designed
rpm and speed of advance its efficiency is
exceeded by no other device. Miller (7) states
the screw propeller’s efficiency as 75 to 85
percent under ideal conditions and contrasts
this with the 40 percent efficiency of a cycloi-
dal propeller. Obviously, the submersible
community is in agreement, for only the
French vehicles SP-350 and SP-500, and
the U.S. Navy’s MAKAKAI use other than
screw propellers for propulsion. NEKTON’s
propeller is of the open screw variety, in that
the shroud around it is solely for protection,
not to improve its efficiency.

Kort Nozzle Propellers

By fitting a specially-designed shroud or
nozzle around a screw propeller, its effi-
ciency can be increased. The design shown in
Figure 8.38 was invented and patented by
Ludwig Kort in the U.S. in 1936. In cross
section the nozzle resembles an aircraft wing
with the outer side or face being practically
straight and the inner side being cambered.

In practice the nozzle experiences a negative
pressure forward of the propeller’s plane of
rotation and a positive pressure aft, which
results in forward thrust. According to refer-
ence (2), in a well-designed propeller-nozzle
combination the nozzle thrust is about half
of the total thrust applied. A further advan-
tage (8) is that the static shroud thrust is
maximum at zero speed; in other words, it is
most effective when the submersible begins
moving from a stationary position. Reference
is made by Taggert (3) to the Kort nozzle
being particularly advantageous when oper-
ating under high slip conditions (during ac-
celeration or when the vehicle is heavily
loaded) and about equal in performance to
the free propeller during low slip conditions.
The advantage of obtaining greater thrust
from a shrouded screw propeller at zero
speed has not been ignored by the submers-
ible builders—a large number of vehicles em-
ploy this feature. Equally attractive is the
fact that a shrouded propeller can be consid-
erably smaller than its ‘free’ counterpart
and still deliver maximum efficiency. This
feature is desirable in that it decreases the
overall vehicle size envelope.

Ducted Propellers
Johnson and Barr (9) define a ducted pro-
peller as any scheme which takes water

Fig. 8.3 A Kort nozzle surrounds the three-bladed thruster propeller of ALVIN.
(WHOI)

through an inlet flush with the hull, adds
energy with a pump located within the hull
and discharges it through a nozzle flush with
the hull. Under this definition falls the
ducted propellers of DOWB (Fig. 8.4). These
ducts are located aft on DOWB and the pro-
peller screw shafts are canted 15 degrees
outboard. This arrangement provides the fol-
lowing advantages: The center of drag is
moved aft for hydrodynamic stability and it
reduces the beam while still maintaining a
large twist moment aft. Analyzing the per-
formance of ducted propellers, Johnson and
Barr state that the inlet and outlet designs
are extremely significant. Ideally, a well-
designed duct would utilize a bell mouth
inlet and a sharp exit extending a short
distance beyond the hull. Where the duct
exit is flush with the hull, jet entrainment
effects cause low pressure in the exit side of
the hull and reduce thrust where both ends
of the duct are sharp and flush with the hull.
In the case of DOWB, there could be a thrust
reduction of unknown magnitude resulting
from an eddy created near the hull by the
exit jet. To prevent the propellers from foul-

Fig. 8.4 The Ducted Propellers on DOWB provide surge and yaw thrust. The two
motors are in the deck plane of the vehicle and canted outboard at angles of 15
degrees. (NAVOCEANO)

Fig. 8.5 Two pi-pitched cycloidal propellers attached to the exostructure of MAKA-
KAI provide its entire propulsion. (U.S.M.C. Air Station, Hawaii)

ing with ropes or cables while submerged,
DOWB’s operators installed fine wire screens
at both the inlet and exit ends. Such screens
also reduce thrust by restricting the flow of
water through the duct. This penalty, how-
ever, could be well worth the price in terms
of safety. Ducted propellers, of varying de-
signs, are found on quite a few vehicles—
mainly because they reduce the vehicle’s en-
velope and chance of entanglement and pro-
peller damage.

Cycloidal Propellers
The U.S. Navy’s MAKAKAI is the only
submersible known to use cycloidal propul-
sion (Fig. 8.5), although its predecessor HI-
KINO was the first. The two units on MAKA-
KAT are Kirsten Boeing, pi-pitch*, cycloidal
propellers mounted on the vehicle’s exostruc-
ture which operate similar to a paddle wheel:
The propeller disc rotates and moves the
blades through the water. Talkington and
Murphy (10) describe its operation as follows:
“The cycloidal propeller is capable of
directing its thrust in any direction in
the propeller disc’s plane of rotation.
The pi-pitch propeller is used because
of its mechanical simplicity and be-
cause of the four degrees of freedom
propulsive control that can be ob-
tained by using two thrusters. Thrust is

generated by movement of the individ-
ual blades. Blade pitch is varied as
the blade moves around its orbit so
that the sum thrust of all blades is in
the desired direction. This pitch is
varied for the pi-pitch propeller by
rotating the blade at one-half the disc
rotational speed. Thrust direction is
varied by changing the relative phas-
ing of the blades with respect to the
disc.

By placing the two thrusters at 45
degrees to the fore/aft vertical plane,
4 degrees of dynamic control (fore/aft,
up/down, transverse, and yaw) are
available (Fig. 8.6). This is arrived at
by summing the thrust vectors. The
coordination of the vectors is con-
trolled by the pilot’s hand controller

UP

FORWARD

which directs the thrust in the direc-
tion his hand is moved. The farther
the hand is moved in a particular
direction, the greater the thrust mag-
nitude and vehicle speed will be.”’

Cycloidal propellers offer several advan-
tages: Superior steering and maneuverabil-
ity, no need for rudders or external shafting
and elimination of the resistance produced
by such appendages. On the debit side, cy-
cloidal propellers are far less efficient than
screw-type propellers, they do not represent
any size or weight savings and there are
sealing problems (7). It would also seem that
protection against damage to the propellers
and underwater entanglement would be dif-
ficult to achieve without substantial loss of
efficiency.

~ >. STARBOARD
‘\ CONTROL
\

fe}

\

\

i]

i}

. !
aS
/ 270

Fig. 8.6 MAKAKAI's thrusters’ positions. [After Ref. (8)]

374

Water Jets

The French SP-350 (Fig. 8.7) and the two
SP-500’s are the only submersibles known to
use water jets as primary propulsion sys-
tems. Lockheed’s DEEP QUEST employs this
means also, but cnly for transverse augmen-
tation of its primary screw propulsion. The
heart of the SP-350 system is a stern-
mounted 2-hp electric motor-driven water
pump which drives seawater forward
through a “Y”’ shaped flexible tube to jets
mounted port and starboard on the vehicle’s
brow. The jets are mounted so that a rack
and pinion movement can rotate them in
unison or individually from straight forward
to straight down. The inefficiency and low
speed of this system were known and under-
stood by Cousteau, but for scientific research
and underwater photography the advan-
tages of high maneuverability overrode its
disadvantages.

A comparison study between a number of
the various propulsion devices described has
been conducted and the results presented in
a previously referenced report by V. E. John-
son and R. A. Barr (9). These authors sum-
marized the results of experimental data to
1965, regarding free propellers, nozzles,
ducts and tandem and cycloidal propellers,
and related these data to the hydrodynamic
performance of the propulsors. The report
provides guidance in the selection of systems
to satisfy propulsion and maneuvering re-
quirements.

Two propulsion systems proposed, but re-
portedly never used on an operational sub-
mersible, are the tandem and varivec propel-
ler systems.

Tandem Propulsion System (TPS)
The TPS consists of two girdling bands of
blades near the bow and stern of a submers-

Fig.8.7 Propulsion for SP-350 is provided by two water jets mounted port and starboard on the centerline forward. The port jet can be seen here pointing directly aft. (NAVOCEANO)

375

ible that can each provide controlled thrust
in any direction (Fig. 8.8). For forward pro-
pulsion the pitch of the blades remains fixed;
for translational thrust in any other direc-
tion the blade pitch can be cyclically varied
with each revolution of the propeller. By
thrust coupling the blades, rotation of the
vehicle in any angular motion can be pro-
vided, thus six degrees of freedom are possi-
ble with the TPS. Model tests by the U.S.

Naval Ship R&D Center in the late 1960’s
showed the system to be capable of its pro-
posed potential (up to 2.2 knots) beyond
which the model became unstable. A station-
ary tail provided the model good stability at
3 to 5 knots, but beyond 6 knots the vehicle
once again became inherently unstable.
While 2.2 knots are more than satisfactory
for submersible speed, other factors contrib-
uted to the demise of the TPS: The system is

Fig. 8.8 One end of a cigar-shaped tandem propulsion system. (U.S. Navy)

very expensive, leaks around seals of the
TPS were common and the complexity of the
control system for six degrees of freedom
was beyond human capability and required a
computer (11).

Varivee Propulsion System

The Varivee (variable vector) propulsion
system was designed by Westinghouse for
DS-20000, but never saw application since
the vehicle was never built. A stern-
mounted, variable pitch, three-bladed propel-
ler (looking somewhat like a single TPS com-
ponent, but with three blades instead of six)
provides variable thrust from full ahead
through zero to full astern by means of col-
lective blade pitch control. Through cyclic
pitch control a side thrust vector can be
achieved to produce yaw directional control
through 360 degrees (12).

Such are the actual and proposed devices
that propel submersibles; in addition, the
screw-type propeller is generally reversible,
it can be varied in speed, and, as will be
shown later, can also be oriented (trained) in
different directions.

While submersible propulsion systems do
not lend themselves to logical or systematic
classification, they can be broken down be-
tween: Main Propulsion and Thruster.

Main Propulsion designates those propul-
sion devices on a submersible used primarily
to provide forward thrust motion and for
cruising. Main propulsion motors are usually
more powerful than thruster motors. They
may consist of the more classical arrange-
ment—one or two stern-mounted propel-
lers—or of paired port/starboard propellers
mounted amidships on the vehicle. The ma-
jority of main propulsion motors are fixed;
that is, unlike an outboard motor, they can-
not be aimed left or right. Those that can be
moved to vary their thrust angle are re-
ferred to as “trainable.”

Thrusters are those propulsion devices
used primarily to move the vehicle left or
right and up or down; they can provide this
service while the vehicle is in motion or
stationary. Thrusters are generally lower
powered than main propulsion motors, and
they are usually, but not always, mounted
fore and aft. Thrusters may be so located and
so oriented as to provide yaw or sidle motion,

377

heave and pitch motion or, by being rotata-
ble through a full 360 degrees, any combina-
tion of motions. While these terms do not
mean exactly the same thing to all submers-
ible builders, they are generally accepted
throughout the industry.

Dive Planes, Rudders, Stabilizers

For maneuvering while underway, many
submersibles are equipped with rudders
(yaw control) and/or dive planes (pitch con-
trol), or both. A great number have neither
dive planes nor rudders, but rely on propul-
sion motors to perform these maneuvers. To
stabilize the moving vehicle a fixed fin or
dive plane is sometimes attached or molded
into the fairing.

Rudders produce force as follows: When
the rudder is deflected to an angle of attack
to the flow a force results. This resultant
force may be broken into two components,
one of which is parallel and the other normal
to the direction of flow. Planes produce force
in a similar manner. The parallel component
is called the drag while the normal or effec-
tive steering component is called the lift. The
lift of a rudder or plane is influenced by its
area, area orientation and rudder angle; rud-
der configuration has less influence. Lift of
rudders or planes varies considerably with,
what is called, the aspect ratio. Aspect ratio
is the ratio of the rudder’s depth (span) to its
width (chord), the latter being the dimension
in the direction of water flow. For rudder or
plane shapes other than rectangular the as-
pect ratio is the ratio of the square of the
span to the lateral area. The turning effec-
tiveness of rudders varies considerably with
aspect ratio. The greater the aspect ratio,
the higher the lift for a given rudder deflec-
tion. However, with a larger aspect ratio, the
rudder will “stall” (lose lift) at a smaller
angle.

The size and configuration of rudders and
planes on submersibles is determined mainly
by trial and error. Mr. Frank Cunningham,
Design Engineer for Perry Submarine Build-
ers, uses a rule-of-thumb that the rudder
area should be at least as large as the area of
the main propeller (about 2 ft?), with the
dive planes equal to the rudder in size and
shape (rectangular). Earlier Perry vehicles
had the planes leading the bow, but because

of the flow of water around the bow they
were not fully effective and subsequently
were moved aft where they provided better
control. While this trial-and-error approach
may appear somewhat unsophisticated,
there are no better guidelines available and
Mr. Cunningham’s concluding statement
fairly well sums up the pragmatic approach
private builders have taken in an area void
of precedent: “It works!”

The shape and location of rudders and
planes, and combinations thereof, vary from
vehicle-to-vehicle, but a sampling of the dif-
ferent approaches can be obtained from the
following examples:

PC-3B (Fig. 8.9) is equipped with a rectan-
gular rudder which is manually turned left
or right. Plexiglass bow planes, similar to
those on DEEP DIVER (Fig. 8.10), control
pitch.

Martine’s SUBMANAUT (Fig. 8.11) com-
bines both rudder and planes into a stern-
mounted arrangement whereby yaw and
pitch are obtained.

SEA OTTER (Fig. 8.12) had a rudder ar-
rangement similar to Perry’s PC-3B, but
both rudder and propeller were shielded for

protection. This is now replaced by a Kort
nozzle.

DEEP QUEST (Fig. 8.13) obtains yaw and
pitch motion with hydraulically actuated
rudder and stern planes. An automatic pilot
system with integrated controls (discussed in
Chap. 2) can “fly” the vehicle on a predeter-
mined course, pitch angle and altitude.

The DSRV submersibles (Fig. 8.14) employ
a unique pitch and yaw system. In this sys-
tem a stern-mounted shroud encircles the
main propeller which may be tilted fore and
aft from the vertical and left and right, thus,
combining a rudder/plane system in one unit.
The shroud is not designed to redirect the
propeller’s thrust, but to orient lines to flow
as does a rudder. Figure 8.15 shows the
variation of shroud lift conditions with angle
of attack for various aspect ratios as calcu-
lated by Lockheed during design of the
DSRV’s.

There is another system of pitch control
which many vehicles with cylindrically-
shaped hulls obtain by virtue of their small
metacentric height. This consists merely of
the occupants leaning or moving fore or aft
within the vehicle. While such tenderness

Fig. 8.9 The PC-3B is provided yaw motion by its stern rudder and pitch by plexiglass bow planes not visible here. (NAVOCEANO)

Fig 8.10 Plexiglass bow planes on DEEP RIVER provide pitch motion. The central
duct encloses a reversible screw propeller which can be rotated 360 degrees to
obtain propulsion in any vertical plane. (NAVOCEANO)

can make piloting difficult, it can be used to
advantage in surmounting sudden, vertical
obstacles in the vehicle’s path. A number of
vehicles have fixed (non-moving) fins or sails
for stabilization at higher speeds. At the
very low speeds at which submersibles work
and transit, the need for such stabilizing
surfaces is sometimes debatable. Indeed, as
related in Chapter 5, Mr. Edwin Link and
others go to the other extreme—decrying
even the need for fairings to streamline the
vehicle. Whether they are necessary or not,
they are still on the vehicle where they as-
sume a variety of shapes and sizes. Two
arrangements of stern-mounted stabilizers
are shown in Figures 8.16 a & b on STAR III
and BEAVER, respectively. Supporting the
non-stabilizer faction, PISCES II and III
originally had tail fins; experience showed
that these were more a hindrance than a

Fig. 8.11 Martine’s SUBMANAUT obtains yaw and pitch motion from stern-mounted

rudder and planes

379

Fig. 8.12 Both propeller and rudder are ducted in SEA OTTER for protection and
greater efficiency.

Fig. 8.13 The sophisticated DEEP QUEST uses hydraulic actuators to orient its rudder and dive planes. (LMSC)

i Pe Ac

Fig. 8.14 DSAV-2's stern shroud tilts fore and aft, and left and right, to provide yaw and pitch motion. The fore and aft circular ducts house lateral (yaw and sidle) thrusters. (U.S.
Navy)

380

help and the later PISCES vehicles IV & V)
abandoned the fins (Fig. 8.17) for easier ac-
cess to the aft machinery sphere, improved
handling and because they were of little
control value anyway. The fins were taken
off PISCES II and III when purchased by
Vickers. Ironically, had the fins been left on
the III vehicle, the entanglement and subse-
quent flooding of the machinery sphere
which led to its sinking could not have oc-
curred (see Chap. 15).

MANEUVERING

The widest divergence of design philosophy
in manned submersibles is found in the ap-
proaches taken to maneuvering and, based
on current submersibles employment rec-
ords, there seems to be no best and no worst
approach. About the only way to categorize

GENERAL pynay,
Electric Bast p, “SS

ASPECT _
RATIO

DIAMETER
CHORD

os

LIFT COEFFICIENT C,

04

0 1 1

20

ANGLE OF ATTACK a (DEG)

Fig. 8.15 Variation of shroud lift coefficient with angle of attack for various aspect
ratios

Fig. 8.16 STAR //l and BEAVER. Showing two different configurations of fixed stern stabilizers. (Gen. Dyn. and North American Rockwell)

381

Amencan Rockwell

A OCKWELL CORPORATION ’

ee RR

Fig. 8.16 BEAVER.

Fig. 8.17 Tail fin stabilizers on PISCES // & II (left background) were discontinued on later vehicles of the PISCES /V variety (right). (International Hydrodynamics)

382

the means of maneuvering is between vehi-
cles that rely solely on motors and those that
use motors in combination with planes and a
rudder. In each case the location and versa-
tility of motors and the shape and location of
the planes and rudders all vary widely and
defy categorization. In an attempt to impose
some order into an area dominated by the
“free spirit,” the following discussion pro-
ceeds along the lines of degrees of freedom
obtained by the “motors only group” versus
the “motor and rudder/planes group.”

To hold this narrative to manageable pro-
portions, only the motions obtained by mo-
tors, planes and rudder are discussed. As
was shown in Chapter 6, submersibles have
the ability to gain pitch and roll by virtue of
variable ballast tanks, battery shifts, mer-
cury transfer and what-not. A discussion of
these is not repeated here. Similarly, most
submersibles can obtain heave motion by
virtue of ballasting or deballasting. Previ-
ously mentioned is the control the operator
has on motion by merely shifting his weight.
Discussed later in this chapter, but directly
related to maneuvering capability, is the
ability of most vehicles to run their motors
at variable speeds independently of each
other and in opposing directions. This fea-
ture provides a great deal of the yawing
capability on vehicles where two motors are
used for main propulsion.

A variety of other maneuvering options
are available. For example, DEEP QUEST
can attain a high upward pitch angle while
stationary on the bottom by transferring
mercury from forward to aft, ALUMINAUT
used its manipulators to climb hand-over-
hand up the side of ALVIN in 1969 to insert a
toggle in ALVIN’s hull, and NEMO can attain
heave by reeling its anchor in or out in a yo-
yo-like fashion. In actual operations, these
and other options are brought into play to
provide virtually any motion or maneuver
desired. These options must be added to the
basic degrees of freedom motions discussed
below.

Propulsive Control
Thrust and Yaw:

The most basic of motions, to move forward
(or backward) and change heading (under-
way or bottomed), are obtained by:

383

a) Two port/starboard reversible propellers
fixed in a horizontal position and
mounted either amidships or on the
stern. By slowing down or reversing one
propeller the vehicle can be made to
yaw. Submersibles in this category are
DS-4000 (Fig. 8.18a), PISCES I, IT, IIT,
IV and V, SP-3000, SDL-1, FNRS-2 & 3
and SNOOPER.

b) Two reversible stern propellers with a
lateral bow thruster for additional help
in changing heading. TRIESTE II (Fig.
8.18b) uses this method.

Thrust, Yaw, Heave:

Adding the ability to maneuver vertically
up or down to that of traversing and chang-
ing course, the following procedures are fol-
lowed:

a) Two port/starboard fixed, reversible pro-
pellers capable of being rotated 360 de-
grees in the vertical plane. NEMO (Fig.
8.18c) used this arrangement (its shape
and low center of gravity held it in a
vertical position) in addition to an an-
chor and winch for heave motions.

b) One (ARCHIMEDE) or two (DEEP
VIEW) stern-mounted, reversible propel-
lers, one lateral thruster and one verti-
cal thruster (Fig. 8.18d).

Thrust, Yaw and Sidle:

Two vehicles can be found with this capa-
bility, MERMAID (Fig. 8.18e), which uses a
reversible stern propeller and two lateral
thrusters (one fore, one aft), and NEREID
which uses a trainable, reversible, stern pro-
peller in conjunction with a fixed, reversible
lateral thruster mounted forward.

Thrust, Yaw, Heave, Pitch:

The greatest number of submersibles us-
ing only motors for maneuvering fall into
this group, and the ways to achieve these
motions are quite varied:

a) Two reversible propellers mounted port
and starboard amidships and capable of
rotating 360 degrees in the vertical
plane. Vehicles using this system are all
small and consist of the All Ocean In-
dustries’ vehicle, GUPPY, K-250 (Fig.
8.18f), STAR I, ASHERAH, BENTHOS
V, SURV and TOURS 64 & 66. A roll
motion can be placed on these vehicles
by directing one propeller’s thrust up-

o

ANCHOR

| wince
c) NEMO
360°
4077) a
———_—_ ————

f) K-250

(aaa
d) ARCHIMEDE e) MERMAID I
=

360°
ROTATION
g) ALVIN i) SEA RANGER

360°
a a ROTATION a :
an’ | | ee
= 3
1) KUMUKAHI

k) SHINKAI
=I ——

j) SP-350
BA7> Oy

! | <=

(igs =| THRUST HEAVE
EM fom =:
| Ol

, ee
YAW SIDLE
LL
n) DS-2000 0) BEAVER aS

m) JOHNSON SEA LINK
Fig. 8.18 Maneuvering by propulsion.

384

ward and the opposing one downward.
Laterally trainable, stern-mounted pro-
peller with port/starboard, 360-degree
rotating thrusters amidships. ALVIN
(Fig. 8.18g), SEA CLIFF and TURTLE
fall into this group.

Two reversible, fixed and ducted stern
propellers (pointing 15° outboard) and
two fixed, reversible, vertical thrusters
fore and aft. DOWB (Fig. 8.18h) can
obtain pitch by operating the thrusters
in opposition.

d) Two fixed, reversible stern propellers
and one fixed reversible, vertical stern
thruster. SEA RANGER (Fig. 8.18i) em-
ploys this system. The vertical thruster
provides pitch and, it is believed, with
proper vehicle trim can also provide
heave.

Two variable-speed, port/starboard
water jets mounted on the bow and ¢ca-
pable of rotating 270 degrees in the ver-
tical plane. SP-350 (Fig. 8.18j) and SP-
500 use this system.

One fixed, reversible stern propeller and
two port/starboard, reversible thrusters
capable of 360 degrees of rotation in the
vertical plane. SHINKAIT (Fig. 8.18k)
uses this approach.

Thrust, Yaw, Heave, Sidle:

In this group are two submersibles, each

with a different means to the same end.

a) The Navy’s MAKAKAI uses two pi-pitch
eycloidal propellers, which were de-
scribed earlier.

b) KUMUKAHI employs four reversible,
fixed, port/starboard thrusters, and one
vertical and one lateral thruster, both of
which are fixed and reversible (Fig.
8.181)

Thrust, Yaw, Heave, Pitch, Sidle:

Two submersibles obtain these motions ex-
clusively through propulsion alone: The
JOHNSON SEA LINK and DS-2000.

a) The JOHNSON SEA LINK (Fig. 8.18m)
carries eight reversible propellers which
are arranged to provide the following:

Three trainable (90° port/starboard)
stern-mounted propellers provide
thrust and yaw. One bow-mounted
and laterally oriented thruster also
provides yaw and, in combination

b

a

7

c

e)

385

with stern propellers in proper orien-
tation, sidle. Two vertical fore and aft
thrusters provide heave and pitch.
Two port- and starboard-mounted,
fore-and-aft thrusters are situated
amidships to assist in thrust.

b) DS-2000 employs two fixed, reversible,
stern propellers, two fixed, reversible
fore- and aft-mounted vertical and fore-
and aft-mounted lateral propellers (Fig.
8.18n).

Thrust, Yaw, Heave, Sidle, Roll:

BEAVER has three reversible, 360-degree
rotatable propellers mounted in an inverted
“Y”’ configuration amidships around its hull;
through a variety of orientations and thrust
combinations five degrees of freedom are
obtained as demonstrated in Figure 8.180.
Similar to NEMO, BEAVER also carries an
anchor and winch which can be used to ob-
tain a yo-yo-like heave motion and fore and
aft transfer of meurcury provides pitch.

Control by Motors, Rudders

and Planes
The greatest number of shallow diving

submersibles is found in the group relying on
rudders and planes, in addition to propellers,
to maneuver. The use of planes and rudders
has one obvious disadvantage: They are only
effective when the vehicle is underway;
thrusters are effective when the vehicle is at
zero speed.

Thrust, Yaw, Heave:

The two General Dynamics’ submersibles
STAR II and STAR IIT fall into this category
and both vehicles’ rudders are hydraulically
powered.

a) STAR II (Fig. 8.19a) is equipped with
two fixed, reversible, stern propellers,
one fixed, reversible, vertical thruster
atop the vehicle just aft of the hatch
and enclosed within the fairing. A rud-
der is formed from the lower trailing
edge of a cruciform tail section.

b) STAR III (Fig. 8.19b) utilizes one fixed,
reversible stern propeller, a vertical
thruster mounted similar to STAR II's,
a fixed, reversible lateral bow thruster
ducted within the exostructure and a
rudder formed from the trailing edge of
its inverted Y-shaped tail section.

= 3
a=) ee

RUDDER
Se oz
PLANE

a) STAR II ee STAR III c) PC-3B

SS
—— mK 4s a

d) AQUARIUS | e) AUGUSTE PICCARD f) ALUMINAUT
<r ere kO ¢ OC SX
eit) aes at
ce Le eee) @-\-8
g) SURVEY SUB 1 h) BEN FRANKLIN i) VOL-LI

=a Se a}
ree

j) DEEP DIVER k) HAKUYO 1) SEA OTTER
rx {
=p
|
oy Se :
t ;
m) SHELF DIVER n) DSRV o) DEEP QUEST

Fig. 8.19 Maneuvering by propulsive and non-propulsive devices.

386

Thrust, Yaw, Pitch:

A total of 18 vehicles obtains these three de-
grees of freedom utilizing three different ap-
proaches. Pitch in all cases is provided by dive
planes; yaw is obtained in two instances with
other than rudders.
rudders.

In the most general situation, maneu-

vering consists of a fixed, reversible

stern propeller, a rudder and dive
planes; the only variation is in the loca-
tion (and shape) of the dive planes. The
following vehicles have bow planes:

NAUTILETTE, NEKTON A, B, and C,

PC-3Al and 2, PC-3B, PC3-X and

SPORTSMAN 300 and 600. Aft dive

planes are found on the MINI DIVER

and Martine’s SUBMANAUT (Fig. 8.11)

while the dive planes are mounted amid-

ships on SEA-RAY. KUROSHIO IT com-

bines both fore and aft planes with a

rudder. While the location of planes var-

ies, the motions obtainable are equiva-
lent and PC-3B (Fig. 8.19c) is used to
demonstrate this arrangement.

In place of a rudder, AQUARIUS I has a

trainable stern propeller (90° port/star-

board) to provide yawing motion. This
propeller is also reversible and a bow
plane provides pitch motion (Fig. 8.19d).

PAULO I had a similar system, but its

dive planes were mounted aft in a fash-

ion similar to Martine’s SUBMANAUT.

AUGUSTE PICCARD has both fore and

aft hydraulically controlled dive planes

(called hydroplanes) to provide pitch. To

obtain yaw, its Kort nozzle can be di-

rected 25 degrees to port or starboard

while its fixed, reversible stern propel-
ler remains in one position. While the
approach to yaw is different from those
of PC-8 and its associates, the result is
the same. Figure 8.19e shows only the
motion of the Kort nozzle on AUGUSTE

PICCARD.

d) TOURS 64 and 66 employ a rudder and
port and starboard mounted propellers
amidships. Both propellers are reversi-
ble and capable of 210 degrees of rota-
tion in the vertical plane.

a)

b

wm

a

(4

Thrust, Yaw, Heave, Pitch:
By including vertical thrusters in a propel-

387

ler/rudder/planes arrangement, the motion
of heave is included in two vehicles.

a) ALUMINAUT (Fig. 8.19f) employs two
fixed, reversible stern propellers, a
fixed, reversible vertical thruster top-
side amidships, a hydraulically-powered
rudder and aft dive planes.

b) SURVEY SUB 1 or TS-1 (Fig. 8.19g)
obtains similar maneuverability using
one fixed, reversible stern propeller, one
fixed, reversible, lateral bow thruster,
one fixed, reversible, vertical bow thrus-
ter, bow planes and a rudder.

Thrust, Yaw, Heave, Pitch, Roll:

BEN FRANKLIN (Fig. 8.19h) is equipped
with four 360-degree, rotatable, reversible
thrusters mounted port and starboard, fore
and aft. Hydraulically-powered rudders as-
sist In yaw motion. The roll motion is as-
sumed to be obtainable by orienting the port
and starboard pairs in vertical opposition to
each other, though this effect is not stated
by the manufacturers.

Trust, Yaw, Heave, Pitch, Sidle:

By various arrangements of thrusters,
rudders and planes, seven vehicles obtain
these motions, each with a system different
from the others.

a) VOL-L1 (Fig. 8.191) has one 180-degree
laterally trainable, reversible, stern pro-
peller, one fixed, reversible, lateral bow
thruster and one vertical thruster aft
and dive planes port and starboard
amidships.

b) DEEP DIVER (Fig. 8.19j) has one 180-
degree laterally trainable, reversible,
stern propeller, one bow thruster capa-
ble of rotating 360 degrees in the verti-
cal plane, one fixed, reversible, aft lat-
eral thruster and bow dive planes.

c) HAKUYO (Fig. 8.19k) has one 180-degree
laterally trainable, reversible, stern pro-
peller, two fixed, reversible, vertical
thrusters fore and aft, one lateral thrus-
ter forward and bow planes.

d) SEA OTTER (Fig. 8.191) has one fixed,
reversible, stern propeller, two fixed, re-
versible, lateral thrusters fore and aft,
one fixed, reversible, bow thruster and a
rudder.

e) SHELF DIVER (Fig. 8.19m) has one 180-
degree laterally trainable, reversible,
stern propeller, two fixed, reversible,

vertical stern and bow thrusters, one
fixed, reversible, lateral thruster fore
and aft and bow planes.

f) DSRV-1 & 2 (Fig. 8.19n) has one fixed,
reversible, stern propeller, one each
(four altogether) fixed, reversible and
ducted, lateral and vertical thruster
fore and aft, port and starboard traina-
ble stern shroud. Roll is obtained by
transfer of mercury from one side to the
other.

g) DEEP QUEST (Fig. 8.190) has two fixed,
reversible, stern thrusters, two fixed,
reversible, ducted vertical thrusters
fore and aft, two fixed, lateral water jets
fore and aft (to provide sidle), hydrauli-
cally-operated stern dive planes and a
rudder.

The degrees of freedom described for each
of the above vehicles were present at one
time and may still remain. It is obvious that
merely adding a thruster or re-orienting an
existing unit can change these motions. Such
changes have occurred in the past and there
is no reason to suspect that varying missions
might not prompt such changes again.

While the approaches to maneuverability
have varied, there is a growing practice
among current builders toward laterally-
trainable stern propulsion units. This fea-
ture provides more responsive and controlla-
ble yaw motion without the aid of a rudder
and provides it at zero speed of advance. In
combination with a lateral bow thruster, the
180-degree trainable, stern propeller also
provides sidle motion.

An interesting approach to steering and
propulsion was presented by Wozniak et al.
(13) and termed ‘‘Wake Steering.” Wake
steering employs a propeller in a converging-
diverging nozzle with four slots through the
surface which may be selectively opened to
provide radial thrust (Fig. 8.20). Wozniak and
his associates offer the following explanation
behind the radial thrust producing forces.

“The combined action of the vehicle

forward motion and propeller induced

flow results in a low ambient static
pressure on the inside surface of the
nozzle, in fact, the propeller wake

attaches to the nozzle. By opening a

small port in the wall of the nozzle,

exterior fluid is induced into the main
flow.This action results in a circum-
ferential variation of the interior pres-
sure and local separation of the wake
which in turn causes a net radial
thrust. Turning forces for various ma-
neuvers are thus developed by opening
one or a combination of ports. Pure
axial thrust is obtained when all ports
are closed.”

The wake steering concept had only under-
gone experimental and theoretical analysis
at the time of their report (1972) and, as the
authors concluded, produced more questions
than answers. It is described herein because
it is a fixed system which, theoretically, can
produce thrust, yaw and pitch motions with
only one propeller and a fixed, instead of
trainable, nozzle.

MOTORS

Regardless of the propulsor type or the

PROPELLER
SUPPORT

CONTROL PORT

CONTROL
PORT

BASIC STEERING NOZZLE & PROPELLER
CONFIGURATION

Fig. 8.20 Wake steering nozzle and propeller. [From Ref. (13)]

nature of its containment, all submersibles
use electric motors to initiate and maintain
motion. The motor may be directly coupled to
a rotating shaft, or it may move the shaft
indirectly through an intermediary hy-
draulic pump. The nature of such motors (or
propulsive power) depends, in part, upon the
vehicle’s size and configuration and the de-
sired speed. Neglecting motor horsepower
requirements for the moment (dealt with in
the following section), let’s turn to an exami-
nation of the design and electrical current
options available to the submersible de-
signer.

Alternating Versus Direct Current
Motors

The choice between a propulsion motor
operating on alternating or direct current
has been almost unanimously in favor of DC.
Only 9 of the 100+ submersibles use AC
propulsion motors; the reason is one of eco-
nomics. While AC motors are simpler in de-
sign and construction, and require less main-
tenance, an inverter must be supplied to
change DC to AC. This adds weight and will
take away from pressure hull space if
mounted therein. More importantly, the in-
verter adds to both the vehicle’s cost and
complexity.

DC motors, on the other hand, can be oper-
ated directly from the battery, they have
better speed control than AC, and produce
higher torque. Because DC motors use com-
mutator bars and brushes they must be pro-
tected from seawater; additionally, they re-
quire more frequent maintenance, which
may be every 40 to 50 hours of service. This
latter feature has not been a great disadvan-
tage because most vehicles are taken out of
the water after each dive when such mainte-
nance may be performed.

Before examining the design of present
electric motors, a basic problem should be
identified. A screw-type propeller turns on a
shaft which in turn is rotated by an electric
motor. Somewhere in this scheme the compo-
nents of the motor must be protected from
seawater. The most obvious solution is to
place the motor inside the pressure hull or
inside a pressure-resistant case, but the fact
that the shaft must both penetrate the case

389

and rotate within this penetration presents
severe problems. From earlier chapters it
was seen that thru-hull shaft penetrations
which are watertight and pressure resistant
are common, but when the shaft must main-
tain these two features and rotate at the
same time a new set of problems is con-
fronted. In essence, a dynamic seal capable
of limiting the leakage of seawater into a 1-
atmosphere motor container is not available
for great depths. In some shallow vehicles,
e.g., the NEKTON series and the Perry vehi-
cles, the pressure at their operating depth
can be overcome by a pseudo-packing gland.
In these vehicles the motor is contained in a
separate, pressure-resistant compartment
either outside or inside the hull. The only
relatively deep submersible in which the
drive shaft penetrates the pressure hull and
the motor is not sealed off from the hull in a
separate compartment is the 2,500-foot AU-
GUSTE PICCARD. The water-tightness of
AUGUSTE PICCARD’s propeller shaft is ob-
tained by a graphite joint inside of which is a
packing gland. An inflatable rubber ring
serves as a security fitting between shaft
bearing and the hull. A variety of contact
seals of this nature is presented in reference
(14), and this report concludes that all con-
tact-type seal configurations are, in effect,
bearings whose generated pressure and
clearance are utilized to restrict leakage.
Design of such seals is, according to Sasdelli
and Spargo (ibid), a trade-off between wear
and leakage, and in the military submarine
where large, powerful propulsion plants are
required and must be protected from both
nature and man, the problem is severly com-
plicated. In manned submersibles, propul-
sion power requirements are minute in com-
parison and nature, through formidable is
the only adversary.

A state-of-the-art summary of propulsion
motors for submersibles was presented by
Mr. L. A. Thomas of Franklin Electric Com-
pany in 1968 (15). Though modifications have
taken place since this summary, the motor
categorizations and the design principles
Thomas outlined are still applicable.

Thomas presented three different design
concepts in electric motors for outboard (vs.
in-hull) propulsion in seawater: Open-

winding, Water-filled; Open-winding, Oil-
filled; and Hermetically sealed motors.

Open-Winding, Water-Filled Motors:

In this design the machinery is open to the
sea and operates within the ambient sea-
water environment where circulating sea-
water both cools and lubricates the motor.
The stator coils are magnet wire insulated
with a heavy-duty waterproof coating, such
as polyviny! chloride (PVC). The advantages
to this system are that no dynamic seals are
required and a supply of machinery fluid is
always available. On the debit side, the poor
lubricating, electrical and corrosive proper-
ties of seawater call for a very high degree
of reliability in components (standard ball or
roller bearings would have a limited life-
span). To restrict the introduction of large
particles and organic materials, a shaft seal
can be installed and internal water compen-
sated to ambient pressure, but, as Thomas
points out, some biological growth and corro-
sion is still likely.

Open-Winding, Oil-Filled Motors:
The stator coils of this motor are wound of

standard varnish insulated magnet wire.
The machinery system may be filled with a
dielectric fluid which provides protection
against corrosion, and also cools and lubri-
cates. Also, the entrained fluid acts as a
pressure-compensation system where a shaft
seal keeps water out and the pressure differ-
ential across the seal can be minimal. This
system is one of the more popular types used
in submersibles with DC motors. Its reliabil-
ity is strongly influenced by the effective-
ness of the seal. The simplest system uses
one seal and one pressure compensator to
maintain the machinery compartment at am-
bient pressure or slightly higher. The major-
ity of seal systems on electric drives uses two
axial face seals at the machinery-shaft-sea
interface and two pressure compensators. An
example of this type of seal design in asystem
is shown in Figure 8.21. If seawater leaks into
the system the motor may fail quickly by
short circuiting. However, DOT studies of
such seals concluded (6 Feb. 1973) that no
serious problems with these seals have been
reported to date, and tests they performed
substantiated this observation. Statice leak-
age immediately after assembly has been re-

SEAL CAVITY COMPENSATOR

MACHINERY CAVITY COMPENSATOR

MACHINERY CAVITY

SIMPLE ELASTOMER DIAPHRAGM

SEA

CC
ee

INBOARD SEAL

OUTBOARD SEAL SLINGER

Fig. 8.21 Double seal, redundant arrangement (AP Nominally Zero). (From Ref. (14)]

390

ported and found to be due to contaminants
between seal faces introduced at the assem-
bly stage.

Hermetically Sealed Motors:

In this design (Fig. 8.22) the electrical sys-
tem is completely isolated from seawater by
impregnating the stator windings in an
epoxy resin and sealing the component in-
side a welded, corrosion-resistant metal case.
The design may incorporate either oil or
water as a lubricant and a shaft seal and
pressure-compensation system can be em-
ployed. According to Thomas, hermetically
sealed motors have successfully performed
as deep as 11,500 feet and can, with minor
modifications, operate successfully to 20,000
feet. He further states that this design pro-
vides maximum reliability in seawater.

STAINLESS
CONSTRUCTION

OIL FILLED BORE

The variety of commercially available elec-
tric motors is manifold and submersible
builders do not appear to favor any particu-
lar brand over the other (See individual list-
ings in Chap. 4). In a few instances they have
modified the design of an off-the-shelf item
to fit their own requirements, e.g., Perry
Submarine Builders. In other cases, such as
HYCO, they manufacture their own. The
shallow diving, smaller vehicles have a
greater range of options than their deep-
diving counterparts because of the small
power requirements and reduced pressures.
In the case of KUMUKAH I, a trolling motor
from Sears & Roebuck suited the task.

A few vehicles employ electro-hydraulic
motors to provide propulsive power; an ex-
ample of this arrangement for MAKAKAI is

PRESSURE AND TEMPERATURE

ANT! - FRICTION
BALL BEARINGS

WATER BLOCK
CONNECTOR

HERMETICALLY SEALED -
ENCASULATED STATOR WINDINGS

DYNAMICALLY
BALANCED ROTOR

COMPENSATING BELLOWS WITH
POSITIVE INTERNAL PRESSURE

LABYRINTH SHAFT
SEAL

RUNNING FACE
SEAL

Fig. 8.22 Cutaway of Franklin Electric's hermetically sealed motor with pressure compensation. (Franklin Elec. Co.)

391

shown in Figure 8.23. A scheme using hyd-
raulic motors in liew of direct electrical drive
in MAKAKAI was because only one electronic
control circuit would be required to control
both motors; hence, simplicity. In NEMO,
because the anchor winch only operated with
hydraulic power, it was considered expedient
to operate the remaining components with
the same hydraulic motor. Use of hydraulic
motors for propulsion is not common in past
or present submersibles, and their employ-
ment is generally based on design or space
constraints peculiar to a specific vehicle.

DRAG FORCES

So far, only the forces that move a sub-
mersible have been discussed. In order to

FLUID
RESERVOIR

E>

i- HYD PUMP
PRESS COMP

FOUR-WAY
CONTROL VALVE

ELECTRIC MOTOR
120 VDC
10 SHP

SHAFT POSITION
ENCODER

derive the propulsive power required to
move a particular vehicle, the forces acting
to resist movement must also be considered.

Two forces act to restrain a submersible’s
movement underwater: Form drag and fric-
tion drag between the water and its skin.
Quite simply, form drag is created as the
water is moved outward to make room for
the body and is a function of cross-sectional
area and shape. Friction drag is created by
the frictional forces between the skin (fair-
ings and appurtenances) and the water.

Form Drag

The ideal hydrodynamic shape for an un-
derwater vehicle is a streamlined body of
revolution with a single screw on the center-
line as shown in the ALBACORE-type hull

Ba Es

THRUST DIRECTION
ACTUATOR

|
|
|
|
el

POWER OUT TO
SPEED REDUCER

HYD MTR

CAM PLATE
SHAFT ENCODER
(SPEED FEEDBACK)

Se eee
HYD MTR - POWER OUT TO
4-HP SPEED REDUCER
1

THRUST DIRECTION
ACTUATOR

Fig. 8.23 MAKAKAI's electro-hydraulic propulsion system.

392

(Fig. 8.24). In this type of body there is low
drag, very little wake and what drag does
exist is largely that of skin friction. As is
evident from Figure 8.24, the drag coefficient
(C,) of such streamlined bodies of revolution
is governed primarily by the length to diame-
ter ratio, sometimes referred to as the ‘“‘fine-
ness”? ratio and secondarily by Reynolds
number of the flow.

A review of the submersible configurations
in Figures 8.18 and 8.19 reveals no parallels
to the ALBACORE hull; the closest similarity
being perhaps that of the DSRV. Submers-
ibles range between bluff (non-streamlined)
to somewhere approaching streamlined bod-
ies; the majority congregating towards the
lower middle or bluff end of this broad cate-
gory. Consequently, high form drag is preva-
lent.

Skin Friction Drag

Skin friction drag is due to the viscosity of
the water. Its effects are exhibited in the
adjacent, thin layers of fluid in contact with
the vehicle’s surface—i.e., the boundary
layer. The boundary layer begins at the sur-
face of the submersible where the water is in
immediate contact with the surface and is at
zero velocity relative to the surface. The
outer edge of the boundary layer is at water-
stream velocity. Consequently, within this
layer is a velocity gradient and shearing
stresses produced between the thin layers
adjacent to each other. The skin friction drag
is the result of stresses produced within the
boundary layer. Initial flow within the
boundary layer is laminar (regular, continu-
ous movement of individual water particles
in a specific direction) and then abruptly
terminates into a transition region where
the flow is turbulent and the layer increases
in thickness. To obtain high vehicle speed,
the design must be towards retaining lami-
nar flow as long as possible, for the drag in
the laminar layer is much less than that
within the turbulent layer.

An important factor determining the con-
dition of flow about a body and the relative
effect of fluid viscosity is the ‘‘Reynolds num-
ber.”’ This number was evolved from work of
the Englishman Osborne Reynolds in the
1880’s who observed that what might have
begun as laminar flow became abruptly tur-

393

bulent when a particular value of the prod-
uct of the distance along a tube and the
velocity divided by the viscosity was reached.
The Reynolds number expresses in non-di-
mensional form a ratio between inertia
forces and viscous forces on the particle, and
the transition from the laminar to the turbu-
lent area occurs at a critical Reynolds num-
ber value. This critical Reynolds number
value is lowered by the effects of surface
imperfections and regions of increasing pres-
sure. In some circumstances, sufficient ki-
netic energy of the flow may be lost from the
boundary layer such that the flow separates
from the body and produces large pressure
or form drag.

The Reynolds number can be calculated by
the following:

ALBACORE Type Hull

3X VOLUME ) =
4X7

BASED ON 7 (

THE CROSS-SECTIONAL AREA OF A
SPHERE OF THE SAME VOLUME

DRAG COEFFICIENT Cp

LENGTH TO DIAMETER (FINENESS) RATIO

Fig. 8.24 Drag coefficient of streamline bodies of revolution

Re
REYNOLDS
NUMBER

108

10°

0.2

0.1

SPEED

1

V
Vv
KINEMATIC
REFERENCE ViSCOSIN
LINE /
LENGTH (cent)
(IN) (FT) STOKES / (FT?/SEC)
80 1,000 80 80 8
60 800 60 60 6
600
5 oN 40 40 4
a 400
TE Air
Line A i
20 Bae ee oC
_— iP °
=10 Neg 10 19 io¢ OF
8 100 8 8
6 ae 80 6 6
60
4 4 4 4
LINE A AND 7 SEAWATER
LINE B PASS LM ee i
2 THROUGH SAME 2 =e 0b
POINT ON 20 NS ee i
REFERENCE LINE ; ae
0.6 8+ o6 0.6 6
6
0.4 0.4 0.4 4
4
0.2 0.2 0.2 2
2
0.1 0.1 0.1 ane

To find the Reynolds number, find the crossing point on the reference line for the product of the
given speed and length; for example, line A for a velocity of 10 ft/sec and a 30-ft length. Then,
using this reference point, find the quotient for the given viscosity; for example, line B for a
viscosity of 1.2 X 10 °° (seawater at 60°F).
intersection of line B and the Reynolds scale—2.5 X 10’ for the example.

Fig. 8.25 Nomogram for finding Reynolds Number.

394

The resulting Reynolds number is given by the

where p = density of fluid (Slugs/ft*)

V = velocity of flow (ft/sec)

m = coefficient of viscosity (lb-sec/
fit)

v = m/p = kinematic viscosity (ft?/
sec)

1 = a characteristic length of the
body (ft)

The Reynolds number can also be obtained
from the nomogram in Figure 8.25.

An additional factor is roughness of the
body surface which will increase frictional
drag. Naval architects generally add a
roughness-drag coefficient to the friction-
drag coefficient value for average conditions.

Because a submersible rarely travels at
constant speed, forces must be considered
that arise from the acceleration of a mass of
fluid entrained by the body or fairings. The
added mass is determined by the mass den-
sity of the fluid and size, shape and motion of
the body. Likewise, there is a moment of
inertia accompanying angular acceleration
which is also added (16). Both the former
force (called virtual or induced mass) and the
latter, moment of inertia, are treated under
unsteady flow in hydrodynamic considera-
tions.

While such considerations are of extreme
importance to the military submarine—
where high speed, among other factors, is
desired—they are less important to submers-
ibles where 2 or 3 knots generally will suf-
fice. More important than the shape of a
submersible are considerations of pressure
hull size, component arrangement, maneu-
verability, weight saving and surface sea-
keeping. Furthermore, while a particular
hull shape may be hydrodynamically satisfy-
ing, the external instruments and equipment
attached from dive to dive will frustrate any
attempts by the hydrodynamicist to main-
tain a low drag coefficient. A number of the
large corporations and academic institutions
have derived the drag forces operating on
their vehicle. One such case is ALVIN, for
which Mavor et al. (8) present a moderately
detailed but fully referenced account of the
procedures and results. Resistance data for
bodies of ALVIN’s shape (described as ocu-
lina) were not available at the time of its
design; consequently, a one-twelfth scale
model was constructed at the Massachusetts

Institute of Technology and towed by a
pusher sting dynamometer. A drag coeffi-
cient of 0.027 based on its wetted-surface
area was indicated. A second test on a one-
quarter scale model at the Illinois Institute
of Technology confirmed the 0.027 drag coef-
ficient. For comparison purposes, a total
drag coefficient for the ALBACORE-type hull
was calculated at 0.0033. While ALVIN is not
the most streamlined of submersibles, it is
not the worst, and it might serve as a gen-
eral comparison for the drag coefficient of
contemporary submersibles (with a spherical
bow) against a streamlined body of revolu-
tion. Interestingly, ALVIN’s resistance is ap-
proximately equal to that of a sphere having
the same cross-sectional diameter as the
hull, and the hull shape in this range of
fineness ratio may not have important ef-
fects on resistance.

PROPULSION POWER
REQUIREMENTS

To derive the horsepower required of a
submersible’s motor two factors must be de-
cided: What is the desired speed, and what
resistance must be overcome? In most cases
the designer will have fairly firm notions
concerning speed, but the resistance or drag
of the vehicle is not always known.

Model testing and the engineering talents
required for drag and dimensional analyses,
such as those performed on ALVIN, are ex-
pensive and far beyond the resources of the
so-called “backyard builder.” Furthermore, if
the model tests were to show an optimum
horsepower which was not available off-the-
shelf, few, if any, of the smaller builders
would be able to afford the cost of a specially
built motor. The approach taken by the small
builder to motor selection is based, in the
final analysis, on availability and trial and
error.

An example of the above approach is found
in the NEKTON vehicles. According to Mr.
Douglas Privitt of General Oceanographics,
the procedure followed in selecting a propul-
sion motor for those vehicles was based on
the following constraints: The motor had to
be DC, series wound, small and light weight.
It had to provide a speed of 2 knots at an
economical current drain and be available

off-the-shelf. These constraints left very few
candidates from which to select. A golf cart
motor of 3.5 horsepower mounted in a pres-
sure-resistant housing designed by General
Oceanographics was selected and has been
quite successful. The power for this motor
was provided by golf cart batteries. Addi-
tional guidance was provided by assaying
the field to see what other similarly sized
vehicles were using. This approach is just as
successful for the NEKTON vehicles of Gen-
eral Oceanographics as the more sophisti-
cated approach taken by the giant Aerospace
Corporation for their vehicles.

The common unit for expressing the power
delivered by a motor is horsepower (hp) (one
horsepower is defined as 550 ft-lb/sec). In
both submersibles and surface ships the
power delivered by the engine to the propel-
ler is called shaft horsepower (SHP), and is

4
3
2
x 2
wn
(a)
Zz
=)
[e)
ee
1o)
z 1
cc
a
0)
0 1 2 3

the product of the torque and revolutions per
minute of the shaft. Another definition of
SHP deducts shaft seal and bearing losses
from the engine output to derive actual
power delivered to the propeller (2). The
power required to propel a submersible
through the water is expressed as effective
horsepower (EHP) and is equal to the prod-
uct of the resistance in pounds and the speed
(ft-lb/sec) divided by 550.

In the ALVIN model tests (8), the total drag
(Rt) was measured by a dynamometer at
varying speeds. By performing the calcula-
tions defining EHP, the horsepower needed
to propel ALVIN through a range of speeds
was found. A plot of these values, including
EHP, is shown in Figure 8.26.

Another example of deriving required
horsepower was given by Daubin (18) for
General Motor’s DOWB. In these calcula-

5

4
m
nn
Sai!
o

3 4
<
m
at
(e)
0)
mn

2
s)
=
m
a

1

0

SPEED—FEET PER SECOND

Fig. 8.26 EHP curves for ALVIN. [From Ref. (17)]

396

tions DOWB’s similarities to ALVIN in fine-
ness ratio, Reynolds number and shape were
considered close enough to justify using the
same drag coefficient of 0.027, from this was
caleulated: Drag, EHP and SHP.

A first approximation of SHP required to
drive a submersible is presented by Rechnit-
zer and Gorman (19) as

SHP = 0.005 V2 As
where V = Speed in knots
ANS propelled displacement. An ap-

proximation of the weight in-
cluding water confined within
the fairing: LBD/60 in. long
tons (2,240 lb); L = length, B =
breadth, D = depth in feet.

From these examples it is apparent that
there are several ways to determine and
obtain the required SHP for a submersible:
The first involves off-the-shelf availability of
candidate motors and intuition, the second
encompasses model testing and a variety of
calculations from model tests of similarly
configured vehicles. In addition there are
other means proprietary to various manufac-
turers. Perry Submarine Builders uses a
method based on past vehicle performance
with various propulsion plants and, in some
manner, observes drag on the vehicle itself
instead of a model. (Personal communication
with F. Cunningham, Perry Submarine
Builders.)

Regardless of the method used to derive
required SHP, the results are fairly consist-
ent: Low SHP is the rule. Where rated horse-
power data is available (58 submersibles), the
following groupings are found: 1-5 hp = 50%;
5-10 hp = 35%; 10-15 hp = 9%; 15-20 hp
2%; the remaining 4%, AUGUSTE PICCARD
and BEN FRANKLIN, use 75 hp and 100 hp,
respectively. (These values are for main pro-
pulsion only and do not include thruster
values.) The low horsepower reflects not only
the undesirability of high speed, but also the
quite limited supply of electrical power
which is the only power source for a variety
of other tasks.

The term V® in the above equation is a
paramount consideration when high speed is
desired, because it represents a heavy toll
one must pay in power for merely a small
increase in speed.

397

Consider the following for the submersible
BEAVER which, from reference (20), has a
A2/s 15. If BEAVER is to cruise at 2 knots
then by the formula:

SHP = 0.005 V* A2/s = 0.005 (2)? (15)
SHE = 0:60

If a 50 percent increase in speed (38 knots) is
desired, then the SHP required increases to
2.03, over a three-fold increase. Let us now
consider what this requires in the form of
electrical power. A 0.60-hp requirement is
equal to 0.45 kWh (hp x 0.745), while 2.03 hp is
equal to 1.51 kWh. An increase in speed,
therefore, calls for electrical power which is
in competition with other tasks equal to, or
exceeding, the importance of higher speed.

CONTROL DEVICES

The means of controlling a submersible’s
Maneuvering devices are as varied as the
devices themselves. At one end of the spec-
trum the control is entirely manual; at the
other end the necessary controls are so com-
plex that computer assistance is necessary.
Between these two extremes are combina-
tions of manual, manual-hydraulic, electro-
hydraulic and electrical. Instead of listing
each and every means used on individual
vehicles, which would be exhaustive, a repre-
sentative selection of vehicles is described.

There is one area of commonality through-
out the field: All vehicles can be controlled
by one person. While several of the larger,
more complex vehicles have a co-pilot, the
second person is not required for basic con-
trol of the vehicle. The co-pilot serves mainly
to relieve the pilot and assist in special ma-
neuvers or functions. The similarity in tasks
between an aircraft crew and the crew of a
large submersible is, in many respects, very
close.

While the major control functions occupy-
ing the operator are those when submerged,
there are certain functions some operators
must perform during launch and retrieval.
The great majority of vehicles place no re-
sponsibility on the pilot during launch or
retrieval other than to secure the hatch and
wait until the vehicle is in the water. Once it
is in the water and free of steadying lines
and lift cable, the operator’s work and con-

trol functions begin. In the case of both
ALVIN and DEEP QUEST, however, coordi-
nation is required between the operator and
support ship during both launch and re-
trieval. An explanation of submerged con-
trol, however, describes the same control
available on the surface.

ALL OCEAN INDUSTRIES:

The All Ocean Industries vehicle and the
K-250 series obtain all propulsion and ma-
neuverability from four 1/2-hp, 6 and 12 VDC
electric motors mounted in pairs port and
starboard amidships. A selector switch is
provided for each motor which can be set at
low, medium or high speed. Control or orien-
tation of the motors, which rotate together
or individually 360 degrees in the vertical, is
quite simple: The operator merely pushes or
pulls a crank-like bar connected to the mo-
tors which rotates within a thru-hull pene-
tration (Fig. 8.27). The motors are pressure-
compensated to 150 feet and produced by
Phantom Motors, Kansas City, Mo. Because
there are no slip rings in the rotating sys-
tem, the operator must be careful not to

rotate the motors beyond 360 degrees or else
he runs the risk of breaking the wires.

SDL-1:

The SDL-1 is propelled by two independ-
ently controlled motors which are mounted
in the horizontal plane port and starboard.
Each motor is compound wound, 120 VDC, 5
hp, reversible and drives a screw-type pro-
peller. A 4:1 planetary reduction gear is cou-
pled to each motor armature. Both motor
casing and reduction gear housing are indi-
vidually pressure-compensated. Control of
each motor is obtained from a Wismer and
Rawlings 50-amp, 60- and 120-VDC, 3-step
reversing control unit. The throttle box is
portable and may be moved about in the
control (forward) pressure sphere. Two 7-step
rotary switches are mounted on opposite
sides of the throttlebox, providing three
speeds forward, three speeds aft and neutral
or OFF. The propulsion motors may be oper-
ated together or independently at any combi-
nation of speeds and in opposition. Rheostats
on the motor starters provide speed adjust-
ment over a small range to equalize propul-
sive thrust of both motors. Ammeters are
provided to monitor currents. Schematics of
SDL-1 showing these systems were not

Fig. 8.27 Manual propulsion control on the K-250 series.

398

available. Instead Figure 8.28 presents the
PISCES series control and propulsion system
which is similar.

PC-14:

The Perry built PC-14 (belonging to Texas
A&M Univ.) (now TECHDIVER) is propelled
by a 386-VDC, 7.8-amp, reversible General
Electric motor. Motor speed control is by a
selector switch on a portable control box
which provides three speeds forward and
three reverse (Fig. 8.29). The rudder and bow
planes are controlled by port (for dive planes)
and starboard (for rudder) levers which are
manually operated and are linked by a rod
and cable to the plane and rudder, respec-

AHEAD ASTERN

PORT
MOTOR

tively. The cable controlling rudder move-
ments (manufactured by Controex Corp. of
America, Croton Falls, New York) is made of
stainless steel and consists of a flexible hous-
ing in which a flat rod rides on ball bearings.
Control mechanisms for the larger Perry-
built vehicles consist of hand-held portable
units (Fig. 8.30) which control all motor
speeds, direction and position (for trainable
units), the planes and rudder. The portable
control box may also include an automatic
piloting feature.

STAR ITI:

STAR III receives thrust power from a 7!/2-
hp electric motor (110 VDC) and vertical and

Fig. 8.28 PISCES’ control propulsion system. (HYCO)

Fig. 8.29 Motor control unit for PC-14.

lateral propulsion from two thruster motors
of 2 hp each. All motors are pressure com-
pensated and reversible, and speed control is
continuously variable throughout its range.
An electrically-powered rudder may be
moved 35 degrees left or right by a 20-rpm,
reversible gear motor enclosed in a pressure-
compensated box. To control these devices
STAR III has both fixed and portable con-
trols. The fixed controls (Fig. 8.31) and push-
buttons are mounted on the starboard side.
To operate the thrusters the buttons must be
constantly depressed, if not, they return to
stop (so-called ‘““deadman” control). There are
no provisions for rudder maneuvering on the
fixed controls. The portable control box has a
joystick for forward-reverse and left-right
control, a separate lever for vertical thruster
control and two toggle switches for left/right
rudder control. The thruster controls provide
for continuously-variable speed and must be
reset to neutral or stop. A rudder angle
indicator is incorporated into the portable
control box. It may seem a small matter
whether or not a button remains in when it’s
been pushed or returns to its “stop” position

when released, but it must be remembered
that if a deadman-type control is used then
the operator can do nothing else with his
hands while pushing the button. In a small
submersible, where the crew consists of one
or two people, a multitude of recurring and
concurrent tasks is required of these limited
resources. Such demands on the occupants
must be considered in designing control de-
vices.

BEAVER:

International Underwater Contractors’
BEAVER receives all maneuvering capabil-
ity from three, 5-hp each, reversible, pres-
sure-compensated, DC motors. Control of
these motors, which are rotatable through
360 degrees in the vertical, is through a
primary and backup system, both of which
are hand-operated and fixed. BEAVER’s pri-
mary control system possibly typifies the
most one can do with one hand in vehicle
maneuvering, without requiring the assist-
ance of a computer. Both control system
components are shown in Figure 8.32, and
the primary control system is shown in Fig-
ure 8.33. At operating depth with the joy-
stick neutralized and motors stopped, the
ballast control buttons bring BEAVER to
neutral trim. Forward or reverse motion is
obtained by pushing the joystick forward or

Fig. 8.30 The portable control box for VOL-L1. Designed and built by Perry
Submarine Builders. (Perry Submarine Builders, Inc.)

SYSTEM

, FIXED
| THRUSTER |
CONTROLS |

: RUDDER ANGLE
INDICATOR

z RUDDER CONTROL
FORWARD

VERTICAL o.
THRUSTER |S x, LEFT
z DOWN ,

RIGHT

STERN AND /
Bow THRUSTER

/

Fig. 8.31 STAR Iil's portable and fixed controls (NAVOCEANO)

BACK UP

MANUAL
THRUSTER POD & PROP
CONTROLLER MOTOR VEHICLE
DRIVER DYNAMICS

ELECTRONICS

DISPLAYS OPERATOR

PRIMARY
CONTROL
ELECTRONICS

SENSORS

Fig. 8.32 Primary and backup control components of BEAVER.

JOY STICK
CONTROLLER

401

FORWARD STARBOARD

a ek REVERSE

HEAVE
CONTROL

PROPELLER
STOP

NON-PROPULSIVE
CONTROLS

Fig. 8.33 Primary motor and variable ballast and pitch/trim control on BEAVER.

pulling back. Side motion is effected by push-
ing the joystick in the desired direction of
movement. Directional changes are effected
by twisting the joystick. Depth and attitude
changes are commanded by rotating the trim
wheels. For emergencies, the propellers can
be stopped or reversed by pressing override
buttons.

An unusual aspect of this control system is
the incorporation of the variable ballast con-
trol in the same component with the motor
controllers. The majority of vehicles locate
ballasting controls completely separate from
the motor controller. The backup control sys-
tem is adjacent to the primary system and
allows independent pod rotation and motor

402

rpm control. Control in the backup mode
permits most maneuvers with the primary
system but requires more operator attention.

ALUMINAUT:

Vehicles as large as ALUMINAUT, AU-
GUSTE PICCARD and BEN FRANKLIN are
generally operated by both pilot and co-pilot.
In the first two vehicles a third crewman
acts as engineer or, more precisely, elec-
tronic technician. AUGUSTE PICCARD had
all controls in the bow hemi-head where both
pilot and co-pilot were stationed. BEN
FRANKLIN’s control station was slightly aft
of the bow on the port side and, when cruis-
ing near the bottom, the co-pilot operated
the controls on voice command from the pilot
who maintained visual contact with the bot-
tom from one of the forward viewports. ALU-
MINAUT operated similarly to BEN FRANK-
LIN, except that the pilot had the option of
controlling the vehicle from his forward posi-
tion with a portable control unit. ALUMI-
NAUT received thrust and yaw from two
reversible, 115- and 230-VDC motors of 5 hp
each and heave from a motor mounted atop
the vehicle with similar characteristics.
Stern planes and rudder were moved by a 1/4-
hp electric motor. The primary control panel
(Fig. 8.34) contains individual controls for all
thrusters, planes and the rudder, in addition
to motor monitoring devices (amperage,
rpm’s, etc.). Motor speed for both forward
and reverse movement is ?/s, 2/s and full.
Pitch control, by transfer of water fore or aft,
is also incorporated in this panel’s trim pump
control. The portable control box (Fig. 8.35)
incorporates all features of the primary con-
trol panel except monitoring devices and
trim control.

DSRV-1 & 2:

The U.S. Navy’s rescue vehicles have the
most sophisticated control system in manned
submersibles. Called ICAD (Integrated Con-
trol and Display) it is likened to the control
and navigation system used in the APOLLO
spacecraft system (Fig. 8.36). The ICAD sys-
tem is complex and its research and develop-
ment cost is reckoned in the millions of dol-
lars. An ICAD simulator is located at San
Diego where candidate DSRV operators
undergo a several-week course to learn of its
operation before they are confronted with
the actual DSRV’s themselves. A description

*

RUDDER/PLANES
Seen

“PORT. “@JSTBD
» vee.

FWD

REV DOWN
LATERAL ge VERTICAL
THRUSTERS THRUSTER

a.

Fig. 8.34 ALUMINAUTs primary control panel. (NAVOCEANO)

403

PORT

DIVE

YS) ste
RISE

Fig. 8.35 ALUMINAUT's portable control unit and forward gyro-repeater. (NAVOCEANO)

of the ICAD is not merely the subject of a
book itself, it is the subject of three large
volumes which cover installation, operation,
troubleshooting and maintenance. Hence,
the description herein will merely acquaint
the reader with ICAD’s existence.

The heart of the ICAD is a digital com-
puter which integrates signals from the
DSRV’s sonars and from the other data-gath-
ering and producing devices, including a
miniature precision inertial platform. The
computer serves as a central processer which
displays pertinent information to the DSRV
operators.

With the aid of visual and aural displays
from the ICAD, the operators make the nec-
essary command decisions and activate the
vehicle’s controls. Two hand controllers con-
trol vehicle maneuverability with the ICAD
translating the operator’s commands into
the proper signals to the various propulsion
and control mechanisms to provide the pre-
cise reaction.

404

The development of ICAD was undertaken
to minimize work and assist the operator
during the intricate DSRV mission. A typical
rescue mission cycle for a DSRV is graphi-
cally outlined in Chapter 15 and under cer-
tain conditions—e.g., where a stricken sub-
marine is listing with an up or down bow
angle and high currents and low visibility
prevail—the ability of a human to direct the
DSRV and respond to the environmental dy-
namics is exceeded. By integrating the con-
trols and displays, the ICAD system reduces
the situation to within the limits of human
capabilities.

The operator’s console shown at the top of
Figure 8.36 is too complex to be shown in
detail, hence the major panel components
are presented at the bottom of the figure.
DSRV maneuvering is realized through the
operation of the two joysticks in the ship
control panel; translational motions (thrust,
heave, sidle) are obtained from the left stick
and rotational motions (yaw, roll, pitch) from

OVERHEAD TRAPEZO10

CONTROL AND DISPLAY
POWER SWITCHING

PANEL

TRIANGLE

POWER PANEL

@e#teesteoeeaese

S eeeeQ" | 5 eeeeQ®™

Fig. 8.36 The integrated control and display system on the DSRV's. (U.S. Navy)

ENTRAL

JUNCTIONS

CENTRAL

PROCESSING
COMPUTER

GRAPHIC
RECORDER

GRAPHIC RECORDER
ELECTRONICS

SHROUD ANGLE

METER PANEL

ELECTRONICS

EXTERNAL FLOOD LIGHTS
CONTROL PANEL

CONTROL SPHERE
INTERIOR
COMMUNICATION

ALARM PANEL

TRANSPONOER
RELEASE PANEL

ure
SUPPORT
PANEL

FILM CAMERA
CONTROL PANEL

+

TELEVISION
MONITOR
PANEL

DATA
PLOTTER

OVERHEAD TRAPEZOID

RACK EQUIPMENT
POWER SWITCHING
PANEL

CONTROL AND DISPLAY
LIGHTING CONTROL. PANEL

INTERROGATION SONAR
TRANSCEIVER

ALTITUDE/DEFTH,
TRANSCEIVER

ia)
ELECTRONICS

SHORT RANGE
SONAR TRANSCEIVER

|

SONAR MONITOR CONTROL INDICATES

TV AND PAN [AND TILT) CONTROLS

PANEL

CENTRAL PROCESSING
COMPUTER CONTROL
AND

PANEL

DISPLAY PANEL

EMERGENCY |

JETTISON PANEL

SHIP CONTROL

MODE PANEL

UNDERWATER
COMMUNICATION TRANSCEIVER

KEY
PANEL

TRANSLATION HAND CONTROLLER

ROTATIONAL HAND CONTROLLER

[== |

aK TELEVISION MONITOR CONTROL AND
PAN AND TILT DISPLAYS

405

DOPPLER
TRANSCEIVER

J - —-—-~ 4

MORIZONTAL OBSTACLE
SONAR TRANSCEIVER

COORDINATOR

OATA RECORDER
REPRODUCER |

S OVERRIDE SwTCHING PANE

FORWARO RACK

the right stick. The information shown on
the ICAD can be seen from the labels on the
general component layout.

Of the seven control systems described,
combinations thereof may be found in sister
submersibles. It has been emphasized re-
peatedly that a number of options are availa-
ble to the operator to gain more motions
than the control system alone provides.
While the ICAD system is a wonder of tech-
nology, it is unnecessary for the kind of
maneuverability required of most submers-
ibles. Indeed, an ICAD system wouldn’t fit in
the majority of vehicles, and its cost alone
exceeds many times that of all but one or two
government-owned submersibles.

With operational experience many of the
propulsion and control devices listed in this
chapter were found unnecessary on some
vehicles and inadequate on others. STAR IIT,
for example, eventually discontinued using
its rudder because it was awkward and slow
to react and adequate control could be ob-
tained by the thrusters alone. Because the
majority of submersibles were one-of-a-kind
prototype models, they reflected the design-
ers’ best initial thoughts on propulsion and
control and the then state-of-the-art in avail-
able hardware. Because few vehicles are sim-
ilar in design and mission, there are only
broad precedents on which to draw, and, in
many instances, the operating life of the
vehicle was too short to evolve the “best”
approach to maneuvering and control.

The benefits a submersible may gain under
an extended operational life is related by
Goudge (21). In this example the submersible
PISCES IT had worked for some time in the
areas off Victoria, B.C., where strong cur-
rents were not a severe operational consider-
ation, but with its transfer to the North Sea,
that harsh environment brought to light de-
ficiencies theretofore unappreciated.

“A speed of some four knots was
expected for PISCES II, but the craft
was so unstreamlined and the appen-
dages caused so much drag, that 11/4
knots only was achieved. This and the
fact that three steps of speed control
only was provided, which meant that
steering by differential use of the
screws was very imprecise, caused

406

great difficulties in maneuvering in
strong currents which are common
round Britain and even in the middle
of the North Sea. The first stage was to
measure the bollard pull and, by
spring balance, the towing pull needed
to produce I1'/4 knots. From this, the
overall efficiency was found to be 14
percent. By fitting cowling extensions
and flow straighteners this was raised
to 28 percent. A false buoyant nose
was fitted forward, Thyristor controls
were provided to give stepless speed
control and the motor windings al-
tered from compound to series, with
higher ratio gear box between motors
and propellers.

The net result of all these has been
to push the top speed up to 4.1 knots
on the log with an overall efficiency of
some 60 percent. Water tunnel tests at
Newcastle University have also showed
the way to still further improvements
should these become economic. The
costs of the greater streamlining that
would be needed are quite heavy.

During the above improvements, op-
portunity was taken to try improved
brushes, gear and operating fluid (the
motors run at ambient sea pressure in
a special oil). Taken all together, the
above measures have reduced a heavy
maintenance load to almost nil, mean
time between failures having changed
from a few hours to a still unknown
but very large number. (The only fail-
ure since, in several hundred hours of
running, has been a cable fault.)”

Such modifications and improvements are
commonplace in submersibles, and more can
be expected as they find wider ranging and
longer undersea employment.

REFERENCES

1. Strasburg, D. W. 1965 A submarine for
research in fisheries and oceanography.
Trans. Mar. Tech. Soc. and Amer. Soc.
Limnology and Oceanog., 14-17 June
1965, Wash., D.C., v. 1, p. 568-571.

. Taggert, R. 1969 Marine Propulsion.
Gulf Pub. Co., Houston, Tex., 368 pp.

10.

IRIE

12.

. Abkowitz, M. A. 1969 Stability and Mo-

tion Control of Ocean Vehicles. M.1.T.
Press, Cambridge, Mass., 190 pp., 6 ap-
pendices.

. Mandel, P. 1969 Water, Air and Inter-

face Vehicles. M.1.T. Press, Cambridge,
Mass.

. Principles of Naval Architecture 1967

edited by J. P. Comstock. Pub. by The
Society of Naval Architects and Marine
Engineers, N. Y., 827 pp.

. Taggert, R. 1968 Dynamic positioning

for small submersibles. Ocean Ind., v. 3,
n. 8, p. 44-49.

. Miller, R. T. 1969 Vessels and floating

platforms. in, Handbook of Ocean and

Underwater Engineering. McGraw-Hill
Book Co., N. Y., p. 920-963.

. Mavor, J. W., Froehlich, H. E., Marquet,

W. M. & Rainnie, W. O. 1966 ALVIN,
6000-ft. submergence research vehicle.
Paper presented at the Ann. Meeting,
N. Y., Nov. 10-11, 1966 of The Soe. of
Naval Architects and Marine Engineers,
Nes, o2) pps

. Johnson, V. E. & Barr, R. A. 1965 Propul-

sion of deep diving submarines. Tech.
Paper presented at the 5-7 May 1965
ASME Underwater Tech. Conf., New
London, Conn., 29 pp.

Talkington, H. R. & Murphy, D. W. 1972
Transparent Submersibles and the
MAKAKAIT. U.S. Naval Undersea Center,
Rept. NUC TP 283, 24 pp.

Greenert, W. Ocean Engineering Support
Division, Naval Materials Command.
(Personal communication).

Pritzlaff, J. A. 1970 DEEPSTAR 20,000.
Preprints 6th Ann. Conf. & Exhibition,
Mar. Tech. Soc., 29 June-July 1, 1970,

407

13.

14.

15.

16.

WG

18.

9:

20.

ai.

Wash., D.C., v. 2, p. 817-836.

Wozniak, J., Taft, C. K. & Alperi, R. W.
1972 ‘‘Wake Steering’? A new approach
to propulsion and control. Preprints 8th
Ann. Conf. & Expo., Mar. Tech. Soc., 11-
13 Sept. 1972, Wash., D.C., p. 681-696.
Sasdelli, K. R. & Spargo, J. D. 1971 Ro-
tary Shaft Seal Selection Handbook for
Pressure-Equalized, Deep Ocean Equip-
ment. U.S. Naval Ship Research and De-
velopment Center, Wash., D.C., 71 pp.
Thomas, L. A. 1968 Designing propulsion
motors for undersea craft. Undersea
Tech., Feb. 1968, p. 24-47; 52.

King, D. A. 1969 Basic hydrodynamics.
in, Handbook of Ocean and Underwater
Engineering. McGraw-Hill Book Co.,
N. Y., p. 2-1 through 2-32.

Torda, T. P. & Hermann, W. 1964 Stability
and Drag Experiments With a Quarter-
Scale Model of the ALVIN Oceano-
graphic Submarine. Illinois Institute of
Tech. Rept. (in ref. (5) above).

Daubin, S. C. 1967 The Deep Ocean Work
Boat (DOWB) An Advanced Deep Sub-
mergence Vehicle. TR67-33; AC Elec-
tronics-Defense Research Laboratories,
Santa Barbara, Calif., 14 pp.

Rechnitzer, A. B. & Gorman, F. T. 1969
Submersibles. in, Handbook of Ocean
and Underwater Engineering. McGraw-
Hill Book Co., N. Y., p. 9-63 through 9-80.
Bodey, C. E. & Friedland, N. 1966 Naval
Architecture of Submarine Work Boats
for Offshore Work. Proc. of Offshore Ex-
ploration Conf., p. 105-121.

Goudge, K. A. 1972 Operational Experi-
ence with PISCES-Submersibles. Conf.
Papers Oceanology International 72,
Brighton, England, p. 270-273.

LIFE SUPPORT AND HABITABILITY

In order to survive and function efficiently
within their sealed chamber, the submers-
ible’s occupants require a supply of food and
oxygen and removal or storage of toxic
gasses which they and their equipment gen-
erate. Survival, however, is only the first
requirement; the second is the ability to
work efficiently and comfortably. The first
requirement is termed life support and the
second may be referred to as habitability.

While there is overlapping between life
support and habitability, a distinction is
made between the requirements and proce-
dures to support life versus the quality of
life. In engineering circles, the latter subject
is termed “Human Factors” and it not only

409

embodies comfort, but safety and efficiency
as well.

LIFE SUPPORT

In designing a submersible life support
system a “Standard Man” may be used ; the
characteristics of this hypothetical human
are presented in Table 9.1. According to the
Marine Technology Society’s Undersea Vehi-
cle Committee (1), the values are conserva-
tive and their use in designing a life support
system will usually result in a system with
satisfactory performance. The standard
man’s values are predicated on the assump-
tion that he will be engaged in very light

TABLE 9.1

THE “STANDARD MAN” FOR LIFE SUPPORT SYSTEM DESIGN COMPUTATIONS

[FROM REF. (1)]

Item Quantity

Oxygen Consumption 0.9
Respired Air 18.
Drinking Water 6
Food, Dry 1.4
Respiration Quotient 85
CO. Produced a)
Water Vapor Produced 4
Urine 4
Feces 0.4
Flatus 0.1
Heat Output

Sensible 250

Latent 220

Total 470

work; this does not take into account the
likelihood of increased oxygen consumption
and carbon dioxide production under stress
conditions.

While a healthy individual’s survival re-
quirements and metabolism may vary quan-
titatively from those of the standard man,
they do not vary qualitatively, and because
of the biological commonality from person-to-
person, all submersible life support systems
supply the following: Oxygen replenishment
and carbon dioxide removal. Some vehicles
have the means to remove atmospheric con-
taminants other than carbon dioxide, such as
carbon monoxide and other gasses which fall
under the category of trace contaminants.
Only a few have the means to control tem-
perature and humidity within the pressure
hull. On the other hand, all can accommodate
a lunch bag and thermos to supply food and
water, and all have some means of storing

410

Units
Ft?/hr at 760 mm Hg
Ft?/hr at 760 mm Hg
Pounds/day
Pounds/day
Volume of CO, produced to 05 consumed
Ft?/hr at 760 mm Hg
Lb/day
Lbs/day
Lb/day

Ft? /day

Btu/hr
Btu/hr

Btu/hr

human wastes. If these requirements are
tabulated, the following is necessary to

maintain a viable environment in a submers-
ible:

Replenishment: Oxygen

Food/Water
Emergency Air
Carbon Dioxide
Trace Contaminants

Human Wastes

Removal:

Control: Temperature*
Humidity*
Monitoring Devices

The emergency air supply in submersibles
is dealt with in Chapter 14 and is not dis-
cussed further here. Preliminary, however,
to a discussion of the above factors is the
length of submergence, and Table 9.2 shows
that the build-up of atmospheric contami-
nants which can be tolerated is directly re-

TABLE 9.2 MAXIMUM ALLOWABLE CONCENTRATION OF SOME
SUBSTANCES IN SUBMERSIBLES [FROM: REF (3)]

Compound aie ar 1-Hr Limit 24-Hr Limit 90-Day Limit
Acetylene C,H, 6000 PPM 6000 PPM 6000 PPM
Acrolein CH,CHCHO Cooking * 0.1 PPM ze
Arsine AsH, Battery Gassing # 0.1 PPM 0.01 PPM

Scrubbers
Ammonia NH, (Metabolic) 400 PPM 50 PPM 25 PPM
Benzene CoH, Solvents = 100 PPM 1.0 PPM
Carbon Dioxide co, Metabolic 19 mm Hg 7.6 mm Hg 3.8 mm Hg
Smoking
Carbon Monoxide co (Metabolic) 200 PPM 200 PPM 25 PPM
Chlorine Cl, (Chlorate Candles) x 1.0 PPM 0.1 PPM
Polyethylene
Ethylene C,H, Decomposition < * 3
Cooking
Formaldehyde HCHO Combustion 5 PPM 5 PPM 5 PPM
Freon 12 CCI,F, Air 2000 PPM 1000 PPM 200 PPM
Conditioning
Freon 11 CCI,F Air 50 PPM 20 PPM 5 PPM
Conditioning
Freon 114 CCIF,CCIF, Air 2000 PPM 1000 PPM 200 PPM
Conditioning
Hydrocarbons Total Aromatic Paints & 2 x 10 mg/m?
(Less Benzene) Solvents
Total Aliphatic Paints & Be * 60 mg/m?
(Less Methane) Solvents
Hydrogen H, Battery Gassing 1000 PPM 1000 PPM 1000 PPM
Hydrogen Chloride HCI Freon 10 PPM 4 PPM 1.0 PPM
Decomposition
Hydrogen Fluoride HF Freon 8 PPM 1.0 PPM 0.1 PPM
Decomposition
Mercury Hg Instruments 3 2.0 mg/m? 0.01 mg/m?
Methane CH, Sanitary Tanks 13,000 PPM 13,000 PPM 13,000 PPM
Methyalcohol CH30H Cigarette Smoke * 200 PPM 10 PPM
Methy! Chloroform CH,Cl; Adhesives & 25 PPM 10 PPM 2.5 PPM
Solvents
Monethanolamine HOCH,CH,NH, co, 50 PPM 3.0 PPM 0.5 PPM
Scrubbers
Nitrogen N, Air As Required As Required As Required
Nitrogen Dioxide NO, Contaminant or 10 PPM 1.0 PPM 0.5 PPM
Hot Surfaces
Nitricoxide NO Contaminant or 10 PPM 1.0 PPM 0.5 PPM
Hot Surfaces
Oxygen 0, 130 mm Hg Min. 130 mm Hg Min. 130 mm Hg Min.
Ozone 0; Precipitators 1.0 PPM 0.1 PPM 0.02 PPM
Commutators Etc.
Phosgene cocl, Freon 1.0 PPM 0.1 PPM 0.05 PPM
Decomposition
Stibine SbH; Battery Gassing * 0.05 PPM 0.01 PPM
Sulfur Dioxide so, Oxidation Sanitary 10 PPM 5.0 PPM 1.0 PPM
Tank Gases
Triary Phosphate Compressors 3 50 mg/m°> 1.0 mg/m?

*No value has been assigned

411

lated to time of exposure. For this reason
there are widely varying approaches con-
cerning what should be replenished, removed
or measured during a dive. On one end of the
spectrum is the K-250 series in which the
builder relies upon hourly surfacing to re-
fresh cabin air. On the other end is BEN
FRANKLIN which supplies virtually every
means to monitor and control cabin air and
store waste products. Both of these ap-
proaches are discussed more fully in a later
section; however, the majority of vehicles
fall somewhere between these two extremes.

Replenishment

Within this category are consumables
which the occupants require during submer-
gence to survive and perform their tasks.
The first of these, oxygen, is required during
any submergence longer than an hour or two
{depending on pressure hull volume); the sec-
ond, food and water, may or may not be
required on a routine dive of one or more
hours duration, but they are generally car-
ried.

Oxygen:

At atmospheric pressure, the recom-
mended oxygen concentration within a pres-
sure hull varies according to the following
sources:

Marine Technology Society (1): 18-24%
U.S. Navy Material Command (2): 17-23%
American Bureau of

Shipping (3): 18.4-23.6%

While there seems to be no clear dividing line
between a normal oxygen content and one
which represents an excessive fire hazard,
MTS and ABS both point out that 25 percent
concentration produces noticeable differ-
ences in combustible materials. The Navy, on
the other hand, clearly states that the sub-
mersible should immediately surface and
ventilate the hull whenever oxygen exceeds
25 percent. Conversely, as oxygen concentra-
tion (partial pressure) decreases, the effects
on occupants of the pressure hull are shown
in Table 9.3.

According to the Standard Man’s require-
ments, 0.9 cubic foot of oxygen per hour is
consumed. The MTS and ABS suggest speci-
fying oxygen storage duration on the basis of
1.0 cubic foot/hour of submergence. Because
of the small internal volume of present sub-
mersibles, a supply of oxygen is virtually a
universal requirement. All but two vehicles
carry compressed, gaseous oxygen in flasks
either inside or outside the pressure hull; K-
250 and BEN FRANKLIN are the two excep-
tions. The former carries no additional oxy-
gen other than what is in the cabin air, and
the latter carries liquid oxygen.

The location of the oxygen storage flask
inside or outside the pressure hull is a trade-
off decision on shallow-diving vehicles. Ex-
ternal storage saves internal pressure hull
volume, reduces total vehicle submerged
weight and is somewhat easier to replenish.
Additionally, ABS requires that if the filled
oxygen storage system contains a volume of

TABLE 9.3 EFFECTS OF VARIOUS OXYGEN CONCENTRATIONS [FROM REF. (2)]

05 Concentration

Partial Pressure Atmospheres

Effect

Easily tired; easily upset emotionally; possible loss of pain or injury; abnormal fatigue from

Lethargic; apathetic; confused thinking; physical collapse; possible unconsciousness, nausea and

.21-0.18 Normal sea-level conditions
0.16—.12 Increased breathing rate, lack of coordination
0.14—.10
exertion
0.10—.06
vomiting
0.06 or less

412

Convulsive movements, gasping, cessation of breathing

oxygen which exceeds 100 percent (+10%) of
the floodable volume of the pressure hull,
then it must be stored in an independent
subsystem. Locating the oxygen flask out-
board of the pressure hull apparently satis-
fies this ABS requirement. Approximately
one-third of all submersibles (for which such
information is available) stores oxygen ex-
ternally; correspondingly, all of these vehi-
cles have operating depths of 2,000 feet or
less. A number of Perry-built vehicles in-
clude this feature (Fig. 9.1).

Arguments against internal storage de-
crease with operating depth, for at some

point the oxygen flask must be made resist-
ant to external pressure (as its internal pres-
sure decreases with oxygen consumption),
and the necessary strengthening adds
weight. Other advantages of internal storage
include the reduction of thru-hull penetra-
tions and the security of having the entire
system inside where it runs no risk of dam-
age from external agents. In the final analy-
sis, however, there appears to be no recom-
mended location (inside vs. outside), for not
MTS, ABS or the Navy addresses the subject
as such. There is, however, a requirement in
the 1974 ABS manual that the flask be lo-

Fig. 9.1 Perry Submarine’s DEEP DIVER carries four oxygen flasks topside between the diver lock-out chamber and helium sphere. (NAVOCEANO)

cated at a distance from the hull or other
critical pressure-resistant components such
that the flask’s implosion will not damage
other items. (See Chap. 13 for “stand-off dis-
tance.”)

There are ABS regulations on the storage
flasks themselves: Storage pressure of 5,000
psi cannot be exceeded; the containers must
comply with Department of Transportation
(DOT) specifications (Part 78, Sub-part C;
Sects. 78.36 to 78.68 inclusive) or any recog-
nized standards; and on small cubmersibles
(less than 60 meters LOA) the containers
must be proof-tested and marked in accord-
ance with DOT procedures approximately
once every year, but not exceeding 18
months.

It is not the intent of this discussion to
recommend what life support systems should
be, but merely to relate what they are. The
reader should be aware, however, that both
the Navy and ABS quite explicitly state cer-
tain material requirements for: Piping, fit-
tings and valves; operating pressures for
control and monitoring devices; cleaning and
storing; and testing and maintenance of the
entire system.

Control of the flow of oxygen into the pres-
sure hull is approached in three ways: The
simplest is by periodically opening the flow
valves; the most common is by continually
bleeding the oxygen through a flow control
valve and flow indicator; and the least com-
mon is by automatically admitting oxygen by

FLOW CONTROL
VALVE
CYLINDER VALVES guyt-ofe PRESSURE
VALVE RELIEF
VALVE
FILLING
SHUT-OFF
= VALVE
CYLINDER NO. 1 =e SS
1,000 CU. IN. FILLING CONNECTION
CYLINDER NO. 2 ral iim
1,000 CU. IN. — I p= = = BLOWER
Z s
! ! 7 ( eer
. cs — ~<___ AIR MIXING
SS ee SF DUCT
EMERGENCY BYPASS <= MIFEUGER
FOR
STORAGE MAIN OXYGEN CONTROL @ DEFOGGING
PRESSURE =
GAGE if H }
+1 _j} VIEW PORT
SHUT-OFF FLOW CONTROL FLOW
VALVE VALVE INDICATOR
PRESSURE
REGULATOR

Fig. 9.2 Oxygen supply system schematic. [From Ref. (10)]

virtue of a mechanism which senses varia-
tions in cabin atmospheric pressure.

In a few vehicles the first approach is
taken and, although not recommended by
ABS or MTS, has worked satisfactorily with
no reported accidents. The procedure is quite
simple: A timer (quite frequently a kitchen
alarm clock) is set to ring every half hour or
so; when it does, the operator resets it, takes
a reading of oxygen or cabin pressure and
then, if necessary, opens the tank to admit a
certain amount of oxygen.

In the second approach, the supply of oxy-
gen is fed through a flow control valve,
thence through a flow indicator and finally
into the cabin. In this procedure the oxygen
is continually bled into the cabin at a rate
somewhere near 0.85 SCFH for each person.

ae

Fig. 9.3 Ducts above DEEPSTAR 2000's viewports blow cabin air mixed with oxygen across the viewports to remove condensed moisture and prevent fogging. The small viewport

The system still requires periodic monitoring
to assure steady flow as internal tank pres-
sure decreases or as cabin temperature var-
ies. The system shown in Figure 9.2 is DS-
4000's, and it includes a pressure regulator
which maintains a downstream pressure of
80 psi +10 psi) from a 3,000 psi tank as long
as the storage pressure exceeds 80 psi. A
further feature of this system is the air
mixing duct, which mixes oxygen with cabin
air and then blows the mixed air downward
and across the viewport (Fig. 9.3). Whereas
the steel pressure hull cools in accordance
with ambient water temperature, fogging
and drippage of condensed water on the
viewport is common. With the modification
shown, the forced air keeps the viewport dry.
Ehot (4) cautions that the air flow should be

between the larger two is for photography.

415

directed downward, because when this de-
vice was initially used in DS-4000 the flow
was upward and the occupants emerged from
a 6- or 8-hour dive with bloodshot eyes and
dry nasal passages caused by the air blowing
into their faces when at the viewport.

Automatic systems are not common on
submersibles but can be found on the more
sophisticated vehicles, such as DEEP
QUEST and DSRV. Because life support con-
trol is so critical, the operator is still re-
quired periodically to monitor cabin oxygen.
It only takes a little more time to check and
regulate a flowmeter while performing the
monitoring functions. If such checks are not
routine, then a warning system is impera-
tive, and, while this does add to the complex-
ity and cost of the vehicle, it frees the opera-
tor for other tasks.

The quantity of oxygen carried varies from
vehicle-to-vehicle. A comparison is shown in
Table 9.4. The MTS recommends that the
oxygen capacity of a system should be stated
in cubic feet of oxygen at 70°F and 760 mm
Hg, but this procedure is frequently not fol-
lowed, hence, many of the values shown are
approximate and were calculated from the
barest of details.

From an efficiency point of view, Beving
and Duddleston (5) point out that a typical
cylindrical steel tank holds approximately 15
pounds of usable oxygen at 2,200 psi. The
cylinder plus oxygen weighs about 150
pounds. With a usable weight ratio of 1-to-10,
a considerable weight penalty is encountered
if many tanks have to be carried. A more
efficient solution, according to these authors,
is to carry oxygen in liquid form. In a typical
double-walled liquid oxygen tank, a pound of
oxygen can be carried for each pound of tank
with corresponding savings in volume. While
Beving and Duddleston’s efficiency figures
for liquid vs. gaseous oxygen are impressive,
the cost, complexity and logistic problems
are unacceptable to most of today’s commer-
cial vehicle owners. Furthermore, it is not
life support endurance which restricts pres-
ent vehicles to short dives; rather, it is elec-
trical endurance.

Food and Water:
There is no submersible now operating

416

that routinely remains submerged for more
than 8 or 10 hours; consequently, food and
water are generally provided in the form of
sandwiches, fruit, candy and thermos jars of
coffee, tea or whatever. Exceptions to this
are BEN FRANKLIN (now inactive) and NR-
1. The latter, in view of its size, mission
endurance and nuclear electrical generating
plant, presumably uses freeze-dried foods or
prepackaged “TV” trays which are prepared
and heated in a kitchen.

While such a casual approach to suste-
nance, at first glance, may seem alarming, it
has produced no ill effects. Indeed, in most
vehicles the support ship cook errs, if at all,
in favor of quantity, for more often than not
a portion of the lunch is returned uneaten.
This procedure works well as long as the dive
is routine. All have not been routine (see
Chap. 15), however, and then emergency ra-
tions became a consideration; in this respect
most are deficient.

In case retrieval is impossible or the sub-
mersible is lost from its support ship,
emergency food and water could be a critical
factor in survival. A wide variety of nutriti-
ous foods which can serve as emergency ra-
tions are available at sporting goods stores
and have a shelf like of many months. Such
fare is not necessarily a gourmet’s delight,
but survival, not comfort, is the order of busi-
ness. The amount of emergency food and
water required is difficult to ascertain, but
little space is required for storage of these
foods and a minimum of 72 hours of
emergency supply does not appear unreason-
able. Freeze-dried foods would be ideal, but in
the small confines of a submersible their pre-
paration is awkward and, without hot water,
they are difficult to mix.

The recent JOHNSON SEA LINK and
PISCES III incidents have increased the
submersible community’s awareness of life
support, and a number of vehicles have in-
creased their supply of oxygen and carbon
dioxide removal compounds to extend support
to 72 hours/oceupant and longer. The Na-
tional Oceanic and Atmospheric Administra-
tion (NOAA) requires at least 72
hours/occupant before it will allow its emp-
loyees to dive in the vehicle. Oddly, no one has
addressed the possibility of decreased human

TABLE 9.4 MANNED SUBMERSIBLE
LIFE SUPPORT CHARACTERISTICS AND INSTRUMENTATION

Endurance Oxygen co, Monitoring De- Trace
(Man-Hrs) Supply Scrubbing vices Aboard Contaminant Temp. Humidity
Submersible Crew! Total? (SCF) Compound 0, CO, Pressure® Control Control Control
All Ocean Ind. 2 12 40 KO, NP* NP NP NP NP NP
ALUMINAUT 6 432 127 LiOH e e e NP Heaters, Hull NP
Insulation
ALVIN 3 216 NA LiOH e e e Activated Carbon NP NP
AQUARIUS | 3 108 140 LiOH e e e Activated Charcoal NP NP
ARCHIMEDE 3 108 NA° Soda Lime e ° ° NP NP Silica Gel
ARGYRONETE 10 1920 163° NA e e e NP Heaters/AC” AC
ARIES | 4 108 140 LiOH e e e Activated Charcoal NP NP
ASHERAH 2 48 NA Soda Sorb e e NP NP NP NP
AUGUSTE PICCARD 44 2112 NA Soda Lime NP NP NP NP NP NP
BEAVER 4 360 250° Baralyme ° ° ° NP NP NP
BEN FRANKLIN 6 6048 922\b LiOH ° ° ° Activated Charcoal NP Silica Gel
DEEP DIVER 4 32 356° Baralyme e e ° NP NP NP
DEEP JEEP 2 104 NA Soda Lime NA NA NA NP NP NP
DEEP QUEST 4 204 200 LiOH ° ° ° Activated Charcoal Heaters AC
DS-2000 3 144 169 LiOH ° e e NP NP NP
Ds-4000 3 144 169 LiOH e e e NP NP NP
DS-20000 3 144 169 LiOH e ° ° NP NP NP
DSRV-1 & 2 27 204 NA LiOH ° e e NA AC AC
DEEP VIEW 2 38 36 LiOH e ° e NP Ice Tray _ Silica Gel
DOSTAL & HAIR 2 80 80 MolecularSieve NA NA NA NA NP NP
DOWB 3 195 160 LiOH e e ° NP NP Desiccant
FNRS-2 2 100 NA Soda Lime NA NA e NP NP Silica-Gel
GRIFFON 3 100 NA Soda Lime e e NA NA NA NA
GUPPY 2 72 NA Baralyme ° e ° NP NA NA
HAKUYO 4 144 NA Baralyme e ° NA Activated Charcoal NP Silica Gel
HIKINO 2 48 36 LiOH ° e ° NP NP Silica Gel
JOHNSON SEA LINK 4 72 660° Baralyme e e e NA AC AC
JIM 1 16 NA Soda Lime e =6NP ° NP NP NP
K-250 1 6 NP NP NP NP NP NP NP NP
KUMUKAHI 2 32 NA Soda Lime ° e e NP NP Silica Gel
MAKAKAI 2 72 NA Baralyme e e NA NP Ice Tray _ Silica Gel
MERMAID | 2 120 167 NA e ° NP NP NP NP
NEKTON A, B, C 2 48 75 Baralyme e NA e NP NP NP
NEMO 2 64 100 Baralyme ) e ° NP Ice Tray _— Silica Gel
NEREID 330 3 96 NA NA e e . NP NP NP
OPSUB 2 50 NA Baralyme e e e NP NP NP
PC-3A1& 2 2 20 70 Baralyme NP NP ° NP NP NP

1 Maximum Normal Complement

2Normal and Emergency Combined

3Cabin Pressure

4NP: No Provisions Aboard

SNA: Information Not Available

© Hydrogen and Compressed Air Also Available
7AC: Air Contitioner

417

TABLE 9.4 MANNED SUBMERSIBLE
LIFE SUPPORT CHARACTERISTICS AND INSTRUMENTATION (Cont.)

Endurance Oxygen co, Monitoring De- Trace

(Man-Hrs) Supply Scrubbing vices Aboard Contaminent Temp. Humidity
Submersible Crew! ‘Total? (SCF) Compound 0, CO, Pressure? Control Control Control
PC-3B 2 20 70 Baralyme NP NP ° NP NP NP
PC5C 3 180 100 Baralyme NP NP ° NP NP NP
PC-8 2 48 288 LiOH ° e ° NP NP NP
PC-14 2 48 66 LiOH e e ° NP NP NP
PISCES | 2 200 50 LiOH e e e NP NP Desiccant
PISCES II & Ill 3 200 50 LiOH e e ° NP NP NA
PISCES IV&V 3 216 NA LiOH e e e NP NP Desiccant
PS-2 2 48 288 LiOH e e e NP NP NP
SDL-1 6 204 870 Soda Sorb ° e NP NP NP NP
SEA CLIFF/TURTLE 3 105 123 LiOH e e e Activated Charcoal NP NP
SEA OTTER 3 200 192 LiOH e ° e NP NP NP
SEA-RAY 2 24 NA Soda Lime NA e NA NA NA Silica Gel
SHELF DIVER 4 172 338 LiOH NP NP e NP NP NP
SNOOPER 2 24 NA Baraiyme NA NA NA NA NA NA
SP-350 2 96 40 Baralyme e e NP NP NP NP
SP-500 1 12 NA Baralyme NP e e NP NP NP
SP-3000 3 144 NA IR8 NP e e NP NP CoCl,
SPORTSMAN 300/600 2 16 15 Baralyme NP NP NP NP NP NP
STAR | 1 18 18 Soda Sorb e NA NA NP NP NP
STAR Il 2 48 NA Soda Sorb e e NP NP NP NP
STAR III 2 120 110 Soda Sorb e e NP NP NP NP
SUBMANAUT (HELLE) 2 24 60 NA NP NP NP NP NP Desiccant
SUBMANAUT 6 300 20 Soda Lime NP NP NP NP NP NP
SUBMARAY 2 32 50 Baralyme NP NP e NP NP NP
SURV 2 100 80 Soda Lime ) e e NP NP NP
SURVEY SUB | 4 240 240 LiOH NA NA NA NA NA NA
TOURS 64/66 2 60 NA Soda Lime e e e NP NP NP
TRIESTE Il 3 72 NA LiOH e ° Activated Charcoal NP NP
VOL-L1 4 192 288 LiOH e ° e NA NP NP
YOMIURI 6 492 NA LiOH NA NA NA NA NA NA

‘Maximum Normal Complement

2Normal and Emergency Combined

3 Cabin Pressure

4NP: No Provisions Aboard

SNA: Information Not Available

© Hydrogen and Compressed Air Also Available
7AC: Air Conditioner

capabilities or even death because of the lack
of food or water. Humans’ existence without
food or water varies considerably, and there
are incredible tales of individuals existing
under extremely trying conditions for long

418

periods of time. But in a submersible more
than mere existence may be required of the
occupants; they may have to perform some
function to bring rescuers to their aid. In a
situation where the hull temperature is high,

water will become the most critical factor;
where the temperature is low, food will be-
come critical. As mentioned, storage of food is
easy and requires little space; water, on the
other hand, requires much more volume and
can become nonpotable. Whereas both food
and water are required, a compromise solu-
tion might be found in one of the diet supple-
ments (Metrecal, Nutriment, etc.) which pro-
vide both food and water. Such liquid supple-
ments require little space, they are nutritious
and have a long shelf life. Regardless of the
liquid and solid sustenance supplied, it ap-
pears rather paradoxical to supply a 3- or
5-day supply of oxygen and carbon dioxide
remover when the occupants might well
perish from lack of food and water before
these critical components run out.

Removal

Certain products of human and non-human
origin must be removed from or stored
within the cabin environment. These are:
Carbon dioxide, trace contaminants and solid
and liquid human waste products. The re-
moval of the first two products is necessary
for survival. Other metabolic wastes are held
in sealed or chemical storage. Although gas-
eous by-products may become noxious, if not
properly stored, they are not necessarily
toxic.

Carbon Dioxide:

The major source of carbon dioxide in a
submersible is human respiration. According
to reference (2), an average consumption of
1.0 SCFH of oxygen per person will generate
an average of 0.80 to 0.85 SCFH of carbon
dioxide (depending on dietary considera-
tions), an equivalent of 0.1 pound/man-hour.
To derive the rate of carbon dioxide buildup,
the Respiratory Quotient (RQ) is required,
and it is equal to the volume of carbon diox-
ide produced for each volume of oxygen con-
sumed, or:

Volume of CO, Produced _ 0.85

ee eS S085
Volume of O, Consumed 1

RQ=

In a closed submersible, carbon dioxide will
increase in accordance with:

%CO, = 0.03 + vin

(ees On Consump ion mate) xo

where: T = Time in hours
V/N = Floodable Volume per per-
: son
RQ = Respiratory Quotient

0.03 = % of CO, in “Clean” Air

Using this formula and the “standard
man” in the 3-man submersible DOWB (140
ft? floodable volume) the following buildup
could be expected on an 8-hour dive where
there is no carbon dioxide removal system:

(0.85) (1.0) (8)
140

%CO, = 0.03 +
%CO, = 0.18

The U.S. Navy recommends that 0.014 at-
mosphere of partial pressure (1.5%) be the
exposure limit of carbon dioxide, while 0.02
atmosphere (2%) indicates a dire emergency.
ABS recommends a maximum of one percent
for long term exposure and MTS agrees with
this maximum, but notes that a maximum
carbon dioxide level of 0.5 percent should be
the design goal for 60- to 90-day missions.

The effects of various carbon dioxide levels
on humans as a function of time is shown in
Figure 9.4. The bar graph to the right of this
figure is for exposure of 40 days and shows
that concentrations of carbon dioxide in air
of less than 0.5 ATA (atmospheres) (Zone A)
cause no biochemical or other effects, con-
centrations between 0.5 and 3.0 percent
(Zone B) cause adaptive biochemical
changes, which may be considered a mild
physiological strain, and concentrations
above 3.0 percent (Zone C) cause pathological
changes in basic physiological functions. For
normal operations, the Navy recommends
that carbon dioxide removal rates should be
provided that result in carbon dioxide partial
pressures corresponding to Zones I and II for
short-term exposures, and to Zones A and B
for long-term exposures.

It is obvious, therefore, that a means
should be available to reduce excess carbon
dioxide or control it at a level where it will
not affect the occupant’s judgement or physi-
cal abilities on a routine dive—and especially
if the vehicle may be unable to surface or
open the hatch.

In order of decreasing usage, four chemical
substances are used to remove carbon diox-

0.12

5
010 &
Oo
oc
=
F :
| O08 oe
ao w
> ae
a
Me 7)
z =
© 006+ 2
of <
- =
fe <
< 004F &
~ <x
3 Zz
9 =
o.02-L &

0.00

TIME, MINUTES

40 DAYS

Fig. 9.4 Relation of physiological effects to carbon dioxide concentration and exposure period. [From Ref. (2)]

ide within submersibles: Lithium hydroxide
(LiOH), a strong alkali; Baralyme (a weak
alkali); Soda Sorb (similar to Baralyme, but
contains small amounts of sodium hydroxide
and potassium hydroxide as an “activator’’);
Soda lime (a low moisture Soda Sorb) and
potassium superoxide (KO,). The last of these
compounds, KO,, performs the dual role of
supplying oxygen as well as removing carbon
dioxide.

The carbon dioxide “scrubber” system is
quite simple: A blower assembly forces cabin
air through one of the above compounds
which, in turn, removes carbon dioxide from
the air as it passes through. There is no
conformity vehicle-to-vehicle on the type of
fan, power of the fan motor, or volume or
configuration of the chemical bed. In the All
Ocean Industries vehicle an automobile vac-
uum cleaner is packed with KO, and the
vacuum cleaner motor operates directly off
the 12-volt battery. In DS-4000 a 1/50-hp
electric motor works directly from a 120-volt
supply to turn a drum type impeller which
forces air through a cannister containing
LiOH. In BEN FRANKLIN, 13 thin rectangu-

420

lar panels containing LiOH were hung
throughout the vehicle and natural convec-
tion currents in the cabin served to pass air
through the panels.

As far as certification or classification is
concerned, the system used to force cabin air
through the absorbent chemicals is left more
or less up to the individual. The ABS states
that the system should be designed with a 20
percent safety factor (i.e., 0.10 lb CO, per
man-hr X 120% = 0.12 lb per man-hr mini-
mum). The MTS states that it is preferable to
use an AC induction motor rather than a
brush type DC motor to eliminate arcing
from the brush type motors.

Probably the best and undoubtedly the
most recent summation of carbon dioxide
removal chemicals and their characteristics
is presented in the report of the JOHNSON
SEA LINK incident (6) in which two occu-
pants of the lock-out cylinder perished of
respiratory acidosis as a consequence of car-
bon dioxide poisoning. The following summa-
tion was written by one of the investigating
panel members, W. M. Nicholson, and is

taken from Appendix 16 of reference (6); it is
only changed insofar as references and table
numbers are concerned to make them com-
patible with the numbering herein:

‘Review of life support systems indi-
cates wide variance in certification
standards with reference to the time
requirements.

An extensive survey (G. E., NRL,
Westinghouse, Navy Sup-Dive, etc.)
also indicates that basic performance
data are not available for all condi-
tions—particularly conditions of low
temperature and high pressure. Test
programs have been proposed by NRL
to accomplish this work but the pro-
grams have never been funded. Basic
characteristics of the commonly used
materials are shown in Table 9.5
(taken from ref. 6). It can be inferred
from ref. (8) that LiOH performance
would have been operating in a near
optimum condition at the low temper-
atures encountered, and that it has a
relatively flat performance curve in
terms of temperature variation. It
should be noted, however, that the

actual tests (8) did not use gas input
temperatures below 77°F.

It is significant that the most de-
tailed investigations have been per-
formed in connection with develop-
ment of closed circuit breathing rigs.
These investigations have universally
noted sensitivity of the removal proc-
ess to temperature, to moisture, to the
precision of packing the cannisters
and to the configuration of the cannis-
ters. Effectiveness of removal is en-
hanced in the closed circuit design by
the diver breathing warm air directly
into the cannister, a process which is
not used in submersibles. They have
also noted marked deterioration, par-
ticularly in low temperature perfor-
mance, which appears to be the result
of water condensing in the cannister,
as well as possible temperature vari-
ance in the rate of reaction.

Serious deterioration in perfor-
mance was noted for baralyme stored
in standard waxed containers. These
conditioners are intended for use in
hospitals where storage conditions are
controlled and 2-year life is expected.

TABLE 9.5 CHARACTERISTICS OF THREE CARBON DIOXIDE ABSORBENTS [FROM REF. (6)]

Absorbent

Characteristic Baralyme Lithium hydroxide Soda Sorb
Absorbent density, Ib/ft? 65.4 28.0 55.4
Theoretical CO, absorption, |b CO>/Ib 0.39 0.92 0.49
Theor. water generated, !b/Ib CO, 0.41 0.41 0.41
Theor. heat of absorption, Btu/Ib CO, 670° 875° 670°
Useful CO, absorption, |b CO>/Ib (based on 50 percent efficiency) 0.195 0.46 0.245
Absorbent weight, Ib per diver hr (0.71 Ib CO.) 3.65 1.55 2.90
Absorbent volume, ft® per diver hour 0.0558 0.0552 0.0533
Relative cost, $/diver hr (1968) $1.75 $6.20 $0.75

Based on generating gaseous HO

DBased on calcium hydroxide reaction only

421

This packaging, while convenient in
size, is not suited to the severe han-
dling and storage in the marine envi-
ronment. Five-gallon (40 lbs) plastic
sealed containers are available and
can be expected to give better quality
assurance.

A check of the National Oceano-
graphic Data Center records on the I-
degree square in which this incident
took place produced the curve pro-
vided on Figure 9.5. It will be noted
that the lowest temperature to be ex-
pected in this area is about 59°F, At
this temperature, using Navy Diving
Operations Manual performance fig-
ures, the load (24 lbs) carried in the
diving chamber should have lasted for
21 hours. The forward chamber (16
lbs) should have lasted 20 hours, as-
suming 70°F in that sphere and good
baralyme. The variation in actual per-
formance from that predicted here is
not readily explainable but could
have been the result of defective bara-
lyme packaging, improper packing of
the cannister, or spreading by the
crew when the cannisters were emp-
tied,—probably a combination of
these.

I feel we (the expert panel) should
consider the following recommenda-
tions for inclusion in the final report
relating to CO, removal systems:

a. Submersibles should carry at least
a 48-hour supply of absorbent (this is
consistent with ref. 1).

b. Lithium hydroxide is to be pre-
ferred wherever low temperatures are
encountered.

c. Only absorbents which are her-
metically sealed should be carried.

d. Such seals must be periodically
checked.

e. Uniform chemical packing is vital
and steps should be taken to insure
this for both pre-packaged cannisters
and those re-loaded on scene.

f. A program to develop accurate
performance parameters for absorb-
ents under the full range of antici-
pated pressures and temperatures
should be undertaken and the results

422

made available to the entire diving
community.”’

Enclosure 2 to Nicholson’s summation and
recommendations discussed the effects of
temperature, humidity and absorbent bed-
configuration on carbon dioxide removal.
The following is extracted from that enclo-
sure:

‘‘The rate at which carbon dioxide is
absorbed in absorbents is influenced
by temperature, and is considerably
lower at 40°F than at 70°F. In some
scrubbers sized for adequate perfor-
mance at 70°F, absorbing capacity at
40°F may be as little as ‘/3 that at
70°F. This effect is strongly dependent
upon the cannister design and the rate
of carbon dioxide absorption, being
most evident in absorbers working at
peak flow rates, and least evident in
oversized scrubbers and those used in-
termittently.

It appears highly desirable to pro-
vide external insulation and heating
of scrubbers for use in cold water as a
means of minimizing size and assuring
that the design absorbent capacity can
be obtained. This is also advisable as
a means of avoiding moisture conden-
sation. A possible alternative is to
design for about three times the ab-
sorbent capacity needed at 70°F.

The efficiency of absorbents is influ-
enced by relative humidity. The ab-
sorbing capacity quoted for Baralyme
and Soda Lime absorbents is obtained
only when relative humidity is above
70 percent. Lower humidity levels re-
sult in less absorbent capacity.
Breathing-gas humidity would usually
be well above 70 percent unless the
scrubber is preceded by a dehumidi-
fier.

Under conditions of high gas humid-
ity and low scrubber surface tempera-
ture it is possible to condense water on
the cannister walls or in the absorb-
ent. This is undesirable because wet
absorbent is inactive and impervious
to air flow, reducing absorptive capac-
ity and increasing pressure drop
through the cannister. Scrubbers for

TEMPERATURE
50° 68° 86° °F
10 20 30 2c

Depth
FT M
20 SOURCE: N.O.D.C. 7/6/63
MAX/MIN TEMPERATURES OBSERVED
IN MONTH OF JUNE
IN 1° SQUARE
LAT. 24-25 N
LONG. 81-82 W
40
X (20-25 CASTS
ALL YEARS—MONTH OF JUNE)
© POINTS FROM ONE CAST
IN JUNE
LAT. 24-26.5N
197 60 LONG. 81- Ww
80
328 100
394 120
140

Fig. 9.5 June temperatures — Key West area. [From Ref. (6)]

423

use in cold water can be designed to

minimize moisture condensation by in-

corporating thermal insulation or by
heating of the cannister.

A variety of absorbent-bed configu-
rations are in use, and none seem to
have advantages that make them uni-
versally applicable. The principal de-
sign requirements are to provide an
adequate amount of absorbent, very
uniform distribution of gas flow
through the absorbent bed, and suffi-
cient time for the absorption reactions
to occur.

The total weight of the absorbent
can be selected on the basis of the
total weight of carbon dioxide to be
absorbed. The volume of a tightly
packed absorbent bed will then de-
pend upon the absorbent density, and
the residence time will be the same for
any configuration of this volume.

The pressure drop through an ab-
sorbent bed will depend upon the rela-
tion of flow cross section and bed
depth for a fixed bed volume. A large
cross section and small depth will
result in low pressure drop. However,
flow distribution over the cross section
depends upon uniformity of pressure
drop, and may be difficult to control
if the bed is too thin. This difficulty
can be minimized by using a perfo-
rated plate at the inlet of the bed to
provide controlled pressure drop and
flow distribution.

If bed volume is selected on the
basis of absorbent weight, then the
residence time of gas in the bed will be
proportional to the rate of ventilation
through the absorber. As a general
rule the volume flow rate through the
scrubber should be the same at all
depths, matching respiratory volume
characteristics.”

Reference (6) did not discuss potassium
superoxide as a carbon dioxide absorbent,
but Presti et al. (9) provided the results of a
design, development and testing program of
commercially available KO, for submersible
life support. The All Ocean Industries vehi-
cle is the only one known to use KO, al-

424

though its application was tested and found
successful by the General Dynamics investi-
gators for STAR Ii. Mentioned earlier was
the ability of KO, to both supply oxygen and
absorb carbon dioxide. In brief, when cabin
air passes through the KO, bed the moisture
in the air reacts with the KO, to produce
oxygen and potassium hydroxide (KOH). The
KOH, a strong alkali, then absorbs carbon
dioxide.

According to the authors, a KO, system
offers the following advantages:

—It weighs less and occupies a smaller

volume

—It costs less to operate

—Stored properly, it has an indefinite shelf

life

—It removes water from the atmosphere

—lIts color change (canary-to-white) can be

used as a depletion indicator

—It will remove odors and trace contami-

nants and kill micro-organisms.

On the other hand, Presti and his co-inves-
tigators admit to several disadvantages of
KO,:

—An initial over production of oxygen can

occur

—Caking or ‘‘mushing”’ and subsequent

plugging of the KO, bed can take place

—KO, emits an irritating dust

—It is a strong oxidizer and therefore

must be handled and used with care

—It reacts very readily with water to pro-

duce oxygen and heat; with sufficient
heat, combustible materials can ignite.

The authors, however, describe design and
handling methods to overcome the disadvan-
tages and offer test results to show KO,’s
practical application in small submersibles.

Another system, using a molecular sieve
solid absorbent which can be regenerated, is
planned for use in a submersible under con-
struction by Messrs. P. Dostal and J. Hair of
Alvin, Texas. In a personal communication
Mr. Dostal sketched the system shown in
Figure 9.6 and cautioned that it is only in the
design stage and, because of its complexity,
its use is speculative. The philosophy leading
to this system and its operation is described
by Mr. Dostal as follows:

“Originally, we had planned to use
LiOH in the scrubber, which was caus-

DIST. DUCT.

12V DC
BLOWER
(120 SCFM)
MECHANICAL H,0
SEPARATOR
(COLD TRAP)

REGULATING :

po“ H,O LIQUID

SILICA GEL

SCRUBBER

DRY AIR LESS CO, &O,

SIEVE

PURGE LINES
Ape

Fig. 9.6 Schematic of the molecular sieve carbon dioxide scrubbing system for a manned

submersible. (Mr. P. Dostal, Alvin, Texas)

tic, hard to store, cost $5.00 a pound
and had to be thrown away when
expired. We then decided to try a
product of Linde Division of Union
Carbide called molecular sieves. This
substance was originally manufac-
tured for use in water vapor removal
for industrial gas processes, but using
the right size (5 angstrom pores) it can
remove CO from an airstream. It does
this by absorption, which is not a
chemical process; therefore, you can
purge the system with a dry gas at
about 800°F and use it over and over
again. To use it as a CO, scrubber, the
entering airstream must be free of any
water vapor. This is because the water
molecule is a much more polar mole-
cule than CO,, and the sieve has a
preference for polar molecules. We
are therefore designing a water sepa-
rator (cold trap) to be used upstream
of the scrubber; this mechanism will
condense out the water vapor which
will be collected and redistributed
downstream of the scrubber. Since the
air coming out of the scrubber will be
100 percent dry, by adjusting the
amount of water redistributed we can
control our humidity. We will also

425

have a small container of Silica Gel
upstream to assure that the air will be
dry before entering the scrubber. The
whole system should be a fairly small
and light-weight package. We will
leave the system in the submarine, and
have our purge lines running to fit-
tings in the hull. Our purge system, of
course, will be external, and the cost
of the purge gas (N,) will be the only
expense of our system.”

The final selection of a carbon dioxide
scrubbing system and compounds should be
made only after very careful deliberation.
Not only should the approach take into con-
sideration the more obvious factors of cost,
scrubbing efficiency, packaging, handling,
etc., which can be gained from the foregoing
discussion, but, to the extent possible, the
less obvious factors which may be external to
the vehicle. According to reference (6), it was
known that the effectiveness of Baralyme
(the scrubbing compound used in JOHNSON
SEA LINK) decreased markedly as tempera-
ture decreased. However, the operators an-
ticipated that all dives would be in warm
waters (65°F or higher), but the data pre-
sented in Figure 9.5 show that the seawater

temperature at the dive location varies
widely about the 65°F value. The last am-
bient temperature measurement taken by
the vehicle’s occupants (38 minutes prior to
entanglement) showed 51.8°F, and the com-
munications log showed 45°F temperature
within the aluminum lock-out cylinder some
8 hours later. At this unexpected tempera-
ture the Baralyme’s effectiveness was se-
verely curtailed. Indeed, no indication of
such low water temperatures was indicated
even from historical data. Another consider-
ation became evident in the characteristics
of the different pressure hull materials used
for the aluminum lock-out chamber and the
forward acrylic sphere. Unlike aluminum,
acrylic plastic has a low heat transfer coeffi-
cient and the operation of equipment therein
maintained a temperature of 70°F at which
the Baralyme functioned adequately. At the
very least, the JOHNSON SEA LINK tragedy
demonstrated how paltry our knowledge of
the ocean is. While there is much we can
predict about it generally, there are few
areas that we can predict specifically, and it
is within this broad host of unknowns that
the submersible dives.

Trace Contaminants:

The broad spectrum of trace contaminants
generally includes all atmospheric contami-
nants, other than carbon dioxide, produced
by the human occupants, the electronic or
mechanical machinery, paints and solvents
and, in some vehicles, batteries within the
pressure hull. Referring back to Table 9.2, it
is obvious that a wide variety of such con-
taminants can evolve. The critical factor in
this category is time of exposure, and most
vehicles do not have a submerged endurance
which allows these contaminants to reach
toxic levels. This is not to imply that the
evolution of trace contaminants may be ig-
nored, but their detection and removal have
been a secondary consideration by most de-
signers because of the short diving time.
But, as the JOHNSON SEA LINK and the
PISCES III incidents demonstrated, life sup-
port for routine diving is not a difficult prop-
osition; it is the non-routine dive that intro-
duces the moment of truth.

426

The ABS has divided trace contaminants
into ‘‘unavoidable” and ‘‘avoidable’’—the for-
mer being those produced by the human
body in its normal functions (e.g., H,, CO,,
NH,, H,S, SO,, CH, and forms of aldehydes
and alcohols) and the latter being those pro-
duced by equipment for cooking. Under
avoidable contaminants they caution that all
instruments should be carefully selected to
avoid contaminant production. Mercury
thermometers should be avoided and non-
reactive protecting and insulating electronic
materials should be used.

Both the ABS and the U.S. Navy require
that a sample of cabin air, obtained under
simulated closed hatch operations, be ana-
lyzed by chromatography. Such analyses
must be performed for initial certification/
classification, and thereafter when major
overhauls are conducted. The Navy further
requires these analyses whenever the inte-
rior is repainted or cleaned with solvents
that contain hydrocarbons or other toxi-
eants.

Removal of trace contaminants can be per-
formed by absorption, adsorption or oxida-
tion, and the following compounds may be
used either actively (by incorporating them
in the scrubber system) or passively (by plac-
ing them in panels or devices into which
cabin air can circulate under natural convec-
tion currents or circulating fans): Activated
charcoals, LiOH, soda lime or other alkaline
earths and Purafil (activated alumina im-
pregnated with potassium permanganate).
In the few submersibles that take specific
measures to remove trace contaminants, ac-
tivated charcoal or carbon is preferred. Ia-
nuzzi (10), in discussing the role of activated
charcoal in odor removal, relates that the
occupants of DS-4000 reported no discom-
forting effects from the cabin aroma whether
charcoal was used or not used; consequently,
its addition to the LiOH cannister was dis-
continued.

In those submersibles where the batteries
are stored in the pressure hull, the role of
Hydrocaps in recombining the hydrogen gen-
erated with oxygen into water was discussed
in Chapter 7. It will suffice to mention that a
number of submersibles with in-hull battery
arrangements also include hydrogen detec-
tors to monitor cabin air.

Human Wastes:

For long duration missions the nature and
source of human wastes which must be con-
sidered are shown in Table 9.6. The Bioas-
tronautics Data Book (11) provides quanti-
tative information on all of these products.
Because of the short dive duration, today’s
submersibles generally only consider urine,
feces and vomitus for their waste storage/
control system. No known submersible de-
sign incorporates a means of ejecting such
wastes into the sea; consequently, all ap-
proaches eventually lead to storing them
until the dive is terminated. The exception,
as noted previously, is the BEN FRANKLIN’s
system of waste tanks for long duration stor-
age.

The solution to storage of human wastes is
inordinately simple: A plastic, sealable bag
takes care of vomitus, and a jar or chemical
toilet takes care of urine and feces. Figure
9.7 shows DS-2000’s approach to urine stor-
age and it typifizs the approach in most
vehicles—it is a polyethylene container made
for the light aircraft industry and has a
liquid capacity of one quart.

A temporary solution to urine and feces
storage is to fast for some period before the
dive commences and to use the support ship
facilities just prior to embarking on the sub-
mersible. While the topic does have its hu-
morous aspects, there is nothing humorous

Fig. 9.7 DEEPSTAR 2000's human element range extender (HERE).

as far as one’s fellow occupants are con-
cerned. In view of the normal discomfort
within small submersibles, consideration in
this vein is not only courteous, but in the
final analysis, the by-product gasses might

TABLE 9.6 HUMAN WASTE PRODUCTS [FROM REF. (1)]

Waste Source Examples

Solid Metabolic Feces
Debris Hair, Nail Clippings, Toilet Paper, Metal Cans, Bottles, Paper, Plastic Packages
Other Waste Food, Vomitus

Liquid Metabolic Urine, Respiration, Perspiration
Other Wash Water, Waste Foods (Coffee, Tea, Milk, etc.), Chemicals

Gaseous Metabolic

Flatus, Ammonia, CO», co

Other Material Outgassing, Bacterial Metabolism

very well nauseate the occupants and be
quite detrimental to the mission. Dr. R. C.
Bornmann, Captain, USN, (personal commu-
nication) states that for a short duration
exposure and with human occupants in good
health, there is no danger to their health
from the gasses evolved, other than their
noxious effects.

Temperature-Humidity Control

Aspects of the cabin environment that
have a direct effect on both occupants and
electronic equipment are temperature and
humidity. Only a handful of submersibles
provide control of these variables and the
results, as we saw from the JOHNSON SEA
LINK, can be fatal in the extreme. For the
most part, however, high and low tempera-
tures and high humidity are inconveniences
that are tolerated until the dive is finished.
But in some instances, the lack of control can
seriously alter the mission. For example, it
was planned to conduct periodic 24-hour bot-
tom excursions during BEN FRANKLIN’s 30-
day Gulf Stream Drift, but none of these
excursions lasted more than 9 hours because
the temperature in the cabin dropped into
the low 50’s (°F). While this temperature was
tolerable, the correspondingly high humidity
(82%) produced a bone-chilling cold that left
little more on the occupant’s mind than to
get warm (Fig. 9.8). Concentration on any-
thing else was all but impossible. The situa-
tion was corrected by ascending into shal-
lower, warmer waters.

On the opposite end are the effects of high
temperature and high humidity. During
tropical operations with DS-4000, Merrifield
(12) reports cabin temperatures of 100°F and
100 percent humidity when operating at less
than 600 feet—with the result that the occu-
pants’ effectiveness was seriously impaired.

The enervating effects of high tempera-
ture and humidity can begin long before the
vehicle submerges. In the tropics and sub-
tropics between-dive maintenance aboard
ship requires the support personnel to work
in the vehicle where conditions can become
almost unbearable unless some form of air-
conditioning is provided. Many support ships
are equipped to blow cool air into the cabin
to maintain a habitable environment.

Large vehicles of the ALUMINAUT variety
produced some unusually trying cabin condi-

428

Fig. 9.8 Just prior to an aborted bottom excursion during BEN FRANKLIN's Gulf

Stream Drift the author, wrapped in a blanket and wearing a foam-rubber pad to

cushion contact between his head and the steel-rimmed viewport, stares balefully ata

fellow passenger. An LiIOH panel and several 5-Ib bags of silica gel can be seen in
the background. (Grumman Aerospace Corp.)

tions when operating in the tropics. ALUMI-
NAUT?’s general operating procedure was to
cast off the towline and transfer the observ-
ers by rubber raft from support ship to sub-
mersible. The observers were instructed to
wear long pants and sweaters, because the
cabin temperature would get quite chilly
after a few hours in the 40° to 50°F bottom
waters. When the passengers embarked, the
interior of the vehicle had almost unbearably
high temperature and humidity. Perspira-
tion before the vehicle dived produced
soaked clothing. When the vehicle reached
operating depth and temperatures dropped,
the wet clothing only served to aggravate
the situation. The final solution was to em-
bark in shorts, towel off at depth when the
vehicle cooled and then change to heavier
clothing which was kept dry within a plastic
refuse bag.

Although submersible occupants have
learned to cope with such conditions, there is
still much to be desired in the way of perma-
nent solutions that do not consume an inor-
dinate share of the limited electrical power

supply.

Temperature Control:

Ambient seawater is the major influence
on temperature within the pressure hull.
The length of time it takes to transfer heat
either into or out of the pressure hull de-
pends upon the hull material. Figure 9.9
shows the temperature variations within the
steel-hulled BEN FRANKLIN during its 30-
day drift. Comparing this with ambient
water temperature reveals a very close cor-
relation. An examination of this plot shows
another major temperature influence: Dur-
ing day 11 the propulsion motors were

TEMP °F

RELATIVE HUMIDITY %

JULY foes

turned on in an attempt to regain the Gulf
Stream’s central core, the four propulsion
motors were activated and the effects of heat
generated by their operation is shown by the
wide variance between cabin and ambient
temperature on that day. Electronic equip-
ment is a positive heat source which can be
an advantage during a deep dive in cold
waters but a disadvantage on shallow dives
in warm waters. Other sources of heat are
the metabolic activities of the occupants
themselves and the chemical reaction in the
carbon dioxide scrubber compounds, which is
exothermic. These contributions are also ap-
parent in Figure 9.9 midday between days 12
and 13 when the vehicle was being towed
back into the central core and all electronic
equipment, except for the underwater tele-
phone and a few scientific instruments, was
turned off.

SEAWATER & CABIN TEMPERATURES) |

SEAWATER TEMP

BOTTOM SURVEY
DEEP DIVE
SURFACE

PROPULSION MOTORS ON

AUG 1969

MISSION DURATION, DAYS

Fig. 9.9 Log of temperature and relative humidity for 30 days aboard BEN FRANKLIN. [From Ref. (16)]

429

Several approaches are taken to control
cabin temperature: Hull insulation to retain
heat; electric heaters to produce heat; air
conditioners to remove heat; and circulation
of cabin air along the colder pressure hull to
cool it or across a block of ice to achieve the
same result.

Insulating the hull is a practice in a few
vehicles and is adequate as long as sufficient
heat is being produced. Electric heaters are
effective if the power they require can be
spared.

Air conditioning serves both a cooling and
humidity control function. Its use, however,
is governed by available electric power. On
JOHNSON SEA LINK the air conditioner’s
motor and compressor are housed externally
in a pressure-resistant container and the
condensers consist of tubular frames behind
the acrylic sphere. Liquid freon enters the
sphere through a penetration with a ball
valve acting as a hullstop. Passing through
the evaporator the gasses pass out of the
sphere to the condenser via a return line
with a check valve hullstop.

Because acrylic plastic has a low heat
transfer coefficient, the air inside traps solar
radiation and can produce extremely high
temperatures. Operators within NEMO expe-
rienced temperatures of 120°F and 85 per-
cent relative humidity (13); consequently, a
system was designed for both NEMO and its
successor, MAKAKAT, to reduce such temper-
ature extremes and maintain a low relative
humidity as well.

MAKAKAI’s systems (14) consist of 25
pounds of ice stored in cannisters (under the
operators’ seats) over which air is circulated
by fans. If the hull is covered until just prior
to the dive the cabin temperature can be
held at 82°F for 6 hours. The cooling system
also removes water vapor from the atmos-
phere by causing it to condense on the cool
ice containers. Various components of this
system are shown aboard NEMO in Figure
9.10.

Humidity Control:

The major sources of water vapor in a
submersible are the cabin air when the
hatch is closed and respiration and perspira-
tion of the occupants. Except for those vehi-
cles with air conditioning, the control or low-

430

ering of humidity is accomplished by adding
a desiccant to the carbon dioxide scrubbing
compound, or by distributing small parcels of
desiccant throughout the vehicle. From all
available information, the only desiccant
used is silica gel, and its effectiveness can be
seen in Figure 9.9 which shows an immediate
decrease in relative humidity following de-
ployment of additional 5-pound, cloth-bound
packages. Many of the random fluctuations
in this figure correlate with temperature
variations. Other variations (decreases) may
be attributed to non-periodic but occasional
massaging and shaking of the packets. By
deployment of some 3,600 pounds of silica gel
throughout the 30-day mission the humidity
level was maintained at a comfortable level.

The effects of high humidity are more criti-
cal on equipment than on humans, especially
when the internal temperature drops to a
level where condensation occurs with subse-
quent drippage or collection of water on and
within electrical components.

Atmospheric Monitoring Devices

The one area where the submersible com-
munity does not lack off-the-shelf instrumen-
tation is in the means available to monitor
the cabin atmosphere. A wide variety of com-
pact, portable and inexpensive monitoring
devices is available from the mining and
aircraft industries, among others, which is
more than adequate for submersible opera-
tions. There is no doubt that improvements
can be made, but, for the present, progress in
deep submergence is not thwarted by lack of
atmospheric monitors. The variety of instru-
ments from which to choose is reflected on
the individual vehicles where few use the
same devices. Consequently, only one or two
instruments from each category are de-
scribed.

Oxygen:

Two factors need be known with regards to
oxygen: How much is in the flasks, and how
much is in the atmosphere?

The simplest answer to the first question is
the pressure gage arrangement shown in
Figure 9.11. This system attaches directly to
the oxygen flasks and is manufactured by
National Cylinder Gas Corporation. The
main components are a gage to show pres-

BARALYME |
CANNISTER ¢§

a

Be SCRUBBER
Ry BLOWER

— al
Fig. 9.10 Various components of NEMO’s life support system. (U.S. Navy)

431

FLOW METER}

|

FLOWMETER

Pes

=) ON/OFF CONTROL

FLASK REDUCTION
GUAGE

|

ht j As: .
ave SLOMY EMP I (CEA JIFLASK CONNECTION
Pp’ ry e : i =a a ate i ie
i a IN USE Sp

Fig. 9.11

sure in the flask (0-4,000 psig), a valve to
reduce the pressure as it comes out of the
flask (0-100 psi) and a flow meter (0-15 lpm)
to indicate and control the rate of oxygen
released to the cabin.

A second arrangement is shown in Figure
9.12. In this Scott device the oxygen is intro-
duced at one of the fittings at the top and
circulates through the system, during which
time flask pressure is measured (0-2,000 psi).
Flow rate is controlled and monitored (SCFH
at 10 psig and 70°F), and oxygen is fed into
the cabin via the companion top fitting or

432

Oxygen flasks and control/monitoring devices aboard PC-14

routed through piping elsewhere if desired.
Quite frequently the readout portion of such
systems is incorporated into the monitoring
panel which is in easy view of the operator
and does not require his moving about to
check the gages.

Several portable devices are available to
monitor the oxygen content in the atmos-
phere. Invariably these are polarographic
sensors which indicate by means of a voltme-
ter.

Both the JOHNSON SEA LINK and SDL-1
use the Biomarine oxygen monitoring sys-

INPUT/OUTPUT FITTINGS

FLOW METER

=

Fig. 9.12 A flow meter and flask pressure indicator once used aboard ALVIN, but now replaced (WHOI)

tem shown in Figure 9.13. This unit (model
202) reads from 0-100 percent oxygen or 0-1.0
absolute atmosphere of partial pressure. The
oxygen is sensed directly by a galvanic cell
containing a gold cathode and a lead anode
in a basic electrolyte. Oxygen diffusing
through the cell face initiates redox reac-
tions which generate a minute current pro-
portional to the oxygen’s partial pressure. A
remote sensor in the diver chamber allows
the pilot to monitor either sphere or diver
chamber oxygen concentrations.

The oxygen sensor in DS-4000 was de-
signed by Mr. Alan Krasberg in 1962 and

433

operates on the principle of a fuel cell. When
molecules of oxygen impinge on the sensing
element, a voltage is generated which is pro-
portional to the partial pressure of the local
oxygen concentration. This device indicates
continuously on a 0-50 percent dial where a
green ring spans the desired 17 to 25 percent
range. The unit operates routinely off the
main power supply (28 VDC drawing 0.1
amp), but in a power failure it has its own
batteries which are kept charged by the
main supply. The device is shown in Figure
9.14. Its accuracy is within the order of its
readability, +0.2 percent.

Fig. 9.13 Bio Marine Industries’ automatic oxygen flow control and sensor unit (Bio
Marine, Ind.)

Fig. 9.14 Westinghouse-Krasberg oxygen monitor. (Mr. A. P. lanuzzi, Naval Facili-
ties Eng. Comm.)

434

Other oxygen analyzing devices are com-
mercially available from Beckman, Teledyne
Analytical Instruments, Johnson-Williams
and others. In some vehicles a second device
is sometimes carried as a backup in the
event of a malfunction in the primary device.

Carbon Dioxide:

Monitors for detecting carbon dioxide
range from the complex to the very simple.
The U.S. Navy’s SEA CLIFF and TURTLE
carry both a fixed and a portable carbon
dioxide monitoring device. The fixed moni-
toring device is manufactured by Interna-
tional Gas Detector Ltd. and reads from 0-5
percent with an accuracy of +0.25 percent.
The analyzer contains two sealed chambers,
each connected to one end of a nonspillable
liquid manometer tube. One of the chambers
contains a cartridge of soda lime, the other
contains a dummy, or inert, cartridge. At-
mosphere diffuses into the chambers
through porous rings. The soda lime absorbs
carbon dioxide creating a lower pressure in
its side of the manometer and drawing the
liquid up in that leg of the tube. The percent
of carbon dioxide in the sample is read di-
rectly on a 0-to-5 percent scale behind the
tube. A knob on the top of the unit is used to
move the scale up and down behind the tube
to zero the unit before use. Each chamber
contains a small cartridge of cotton wool
soaked with water to maintain equal vapor
pressures in each side of the unit, thereby
making it impervious to changes in humid-
ity.

The portable analyzer is shown in Figure
9.15. It uses a liquid absorbent to remove
carbon dioxide and indicates concentration
by volume change. The unit is manufactured
by F. W. Dwyer Company and is found in a
number of submersibles. In operation, an
aspirator bulb is used to force the air sample
into the water saturation chamber through
the sample line. The plunger valve is de-
pressed while the aspirator pumps the sam-
ple in, thereby allowing the sample to pass
down through the sample intake tube, out
through the cross bores at the bottom of the
intake tube, up through the distilled water in
the water saturation chamber and over into
the sample chamber. The sample is vented
off to the atmosphere through a float on one

a :
—— =

Fig. 9.15 The Dwyer portable carbon dioxide monitor. (Mr. A. P. lanuzzi, Naval
Facilities Eng. Comm.)

Fig. 9.16 A Kitagawa CO> detection kit used as a backup system aboard DS-2000.

435

side of the plunger valve. After the sample is
pumped through the unit, the plunger valve
is released, closing off both the atmospheric
vent and the connection to the water satura-
tion chamber. The CO, is absorbed by slowly
raising and lowering the absorption basket
four times. The indicating tube is then
vented to the atmosphere by depressing the
vent valve until the fluid level comes to rest,
then releasing it. The percent CO, is read
directly from the position of the fluid level on
the calibrated scale. The instrument is reset
for a new measurement by depressing both
the plunger valve and the vent valve until
the fluid is balanced. The unit is zeroed by
sliding the scale vertically by means of the
zero adjusting nut.

Several other portable and hand-held de-
vices can be used, not only for carbon dioxide
monitoring, but for other atmospheric con-
taminants as well. DS-2000 carries both a
Kitagawa and a Mine Safety Appliances car-
bon dioxide testing kit as backup for its
primary Dwyer monitoring system.

Using the pump shown in Figure 9.16, a
sample of atmosphere is drawn into a glass
phial within which a granular reagent shows
concentration of carbon dioxide by color
change. Similar in design is a Drager Multi-
Gas Detector which, by inserting the proper
phials, can measure a wide variety of atmos-
pheric trace contaminants.

Temperature and Humidity:

In order to avoid the possibility of contami-
nation from spilled mercury, only bimetallic
temperature sensors are acceptable. A num-
ber of vehicles use a relative humidity indi-
cator manufactured by the Bacharach In-
strument Co. of Pittsburgh, Pa. Both temper-
ature and humidity measurements have
been combined by Bacharach into one instru-
ment with a readout for both variables. In
the model used aboard SEA CLIFF and TUR-
TLE (Bach. Code 22-4529) temperature is
indicated from 0° to 130°F (41°F accuracy
from 32°-130°F) and relative humidity from 0
to 100 percent (+3% accuracy from 15 to 90%
RH 32° to 130°F). The design of the tempera-
ture sensing element is based on a conven-
tional spiral-wound, bimetallic spring con-
nected to a pointer. The humidity sensing
element consists of a hygroscopic animal

\ \ |
eave ly

|

1
rs
PRE

Sn 1
ae

URE 13--O7
SED

1& a
ABS _ _UTE
9 1

Fig. 9.17 Cabin pressure indicator (Altimeter). (Mr. A. P. lanuzzi, Naval Facilities
Eng. Comm.)

membrane clamped between a pair of alumi-
num retaining rings. A spring-loaded linkage
assembly is connected with the center of the
diaphragm, pulling it into a conical shape.
The other end of the linkage is connected to
the indicating pointer. Since the diaphragm
is sensitive to moisture in the surrounding
air, changes in humidity cause proportional
changes in its dimensions. Movement of the
apex of the diaphragm is transmitted to the
pointer through mechanical linkage. The
unit does not require maintenance or adjust-
ments.

Cabin Pressure:

Ascertaining the atmospheric pressure
within the cabin is important for crew com-
fort (a sudden decrease in pressure when the
hatch is opened may be quite painful) and
safety (undetected buildup of pressure might
reach proportions requiring decompression).
Additionally, the oxygen flow rate in many
vehicles is usually adjusted by noting
changes in cabin pressure. There are a num-
ber of devices which can be used to measure
pressure changes, but the one most widely

436

employed is a sensitive aircraft altimeter
(Fig. 9.17). A regular barometer is limited in
range. Altitude (pressure) changes are
caused by variations in oxygen or carbon
dioxide within the cabin; in DOWB (140 ft?
internal volume) a one percent increase in
either will cause a decrease in altitude of 277
feet (15). Unfortunately, temperature and
relative humidity changes are also reflected
on the altimeter and a means for correcting
the altimeter for these changes must be pro-
vided if concentration of gasses is desired.
Inadvertent or accidental pressure buildup
to the point where decompression would
have been required has never been reported;
in most cases the buildup is slight, but suffi-
cient to be noticed on the ear drums when
the hatch is opened following a 6- or 8-hour
dive. The possibility that such a buildup
might occur can bear on the methods used to

Ty a

we bas

HOOP RRO RDO ROD OY’

f

ae

Fig. 9.18 Two different methods of securing a hatch cover. a) DS-2000, b)
AQUARIUS |. (a. Westinghouse Corp.)

secure the hatch cover. On a number of
vehicles the hatch cover is secured to the
hull by metal clips which extend from the
hatch cover into and tangential to the pres-
sure hull. An example of this type of ar-
rangement is shown in Figure 9.18a. With
this method pressure could build to a point
where, when the vehicle is surfaced and free
of hydrostatic pressure, the hatch cover
could be forced upward sufficiently to inhibit
retraction of the securing clips. An alternate
solution might be to undog the hatch when
submerged, but this may lead to explosive
depressurization when nearing the surface.
To overcome the problem where the hatch
could not be undogged due to high cabin
pressure, International Hydrodynamics has
derived an alternative securing method
which is shown in Figure 9.18b and is used
on AQUARIUS I. This method consists of a
thick rubber strap affixed into a clip inside
the pressure hull. The philosophy here is
that the only time the hatch cover needs to
be held secure is when the vehicle is on the
surface (the strap provides this function) and
that ambient pressure will keep it closed
when the vehicle is submerged.

To solve the pressure problem a number of
vehicles provide a thru-hull pressure relief
valve which allows the operator to relieve
the pressure when surfaced without opening
the hatch and at a desired rate. BEN

437

FRANKLIN, for one, had such an arrange-
ment which could be used to “burp’’ the
pressure hull if so desired.

While submersible diving history shows no
evidence of internal pressure buildup to dan-
gerous proportions, there is always the possi-
bility that it can occur and the seemingly
simple task of securing a hatch cover may
have important repercussions.

Philosophical Approach; Two
Examples

The duration, control and monitoring of
life support systems is finalized, not only on
the basis of the number of occupants, volume
of the cabin and length of dives, but also on
the operator’s philosophy concerning safe
diving practices. Most operators agree on the
following: A supply of oxygen, a carbon diox-
ide removal system and monitors for atmos-
pheric pressure, oxygen and carbon dioxide.
But there are extremes on both sides—e.g.,
the K-250 and BEN FRANKLIN. The former
relies on nothing but air within the cabin;
the latter supplies virtually every need for
life support. Before examining these two ex-
amples, attention is directed to a paper by
Mr. A. P. Ianuzzi (10) who describes the
philosophical and technical considerations
that went into the design of DS-4000’s life
support system. Ianuzzi’s report is an excel-
lent example of the considerations and trade-
offs a submersible designer must confront in
life support design and is recommended as a
practical primer for the neophyte.

Most submersibles provide a life support
system paralleling that of the DS-4000, but
on both sides of this system are extremes
which are derived by virtue of the dive time.
K-250 has a 1'/2-hour dive duration; BEN
FRANKLIN has a 30-day duration. BEN
FRANKLIN remained under longer than any
other submersible and its life support system
is described because it was highly successful
and required virtually no electrical power.
Additionally, the results of the system’s ef-
fect on the crew members were exhaustively
examined and documented; hence, there may
be one or more features of this proven sys-
tem which may be of value to future design-
ers and present operators. K-250 is dis-
cussed primarily because it represents a rad-
ical variation from every other design and
the designer states why in detail.

The designer and builder of these 1-man,
250-foot vehicles is Captain George Kit-
tredge, USN (Ret.) of Kittredge Industries,
Warren, Maine. Several K-250’s have been
built and sold, and Captain Kittredge offers a
15-page brochure (for a nominal fee) which
relates the vehicle’s design, his history as a
builder and his personal philosophy as re-
gards design of various submarine systems.
Kittredge’s naval experiences included a
tour of duty as commanding officer of a Navy
submarine, so he comes into the submersible
field with credentials as appropriate as any.
For this reason it is interesting to examine
an approach to life support which is radically
different from those of all of his associates in
deep submergence; the following quote is
from his brochure entitled K-250.

‘From time to time, people ask us
what we do about air for breathing in
our submarines. The answer is that we
use the same method that was used in
U.S. Navy submarines during World
War II: namely, we breath the atmos-
phere inside the submarine. Theoreti-
cally, there is sufficient oxygen in the
atmosphere inside the submarine to
last six hours; however, in actual
practice we recommend surfacing and
reventilating every hour. This takes
less than five minutes and is the easi-
est, simplest, and safest thing to do.

We do not recommend carrying com-
pressed oxygen in the submarine for
two reasons. A leak in the oxygen
system would build up an internal
pressure in the submarine and could
prove toxic to the operator. Secondly,
an oxygen enriched atmosphere could
result in a fire hazard. While oxygen
itself will not burn, it supports com-
bustion. The space capsule fire that
took the lives of three astronauts is a
good example of what can happen
when you have an oxygen enriched
atmosphere in a confined space. Nor
do we recommend the use of CO, ab-
sorbent in our submarines. CO, ab-
sorbent can defeat the only means a
human body has of detecting ‘‘bad
air.”’ Almost everyone has, at one time
or another, been in a crowded room

438

and heard someone say, “It’s getting
stuffy in here. Let’s open a window.’’
What actually happened in such a
case, was that the level of CO, in the
room had built up and increased the
acidity of the blood. That part of the
brain known as the ‘‘obligata med-
ulla”’ detects an increase in the acid-
ity of the blood. Thus, the human body
can detect a high concentration of CO,
but it cannot detect a deficiency of
oxygen. The most dangerous thing that
could be done in the above example of
the crowded room, would be to use CO,
absorbent.

So this is the system we recommend.
Surface and ventilate the submarine
every hour or more often if you

“think”? the air in the submarine is
getting foul. This is the safest, sim-
plest, and least expensive procedure to

follow.”’

From a technical point of view Kittredge’s
philosophy is unassailable. The medulla ob-
longata will indeed warn of excess carbon
dioxide, but if one reviews the incidents re-
lated in Chapter 15, there are times when
the window in the submersible’s “stuffy
room” cannot be opened. Captain Kittredge’s
approach to life support stands alone in the
field of deep submergence.

BEN FRANKLIN:

Relative to military submarines, which can
stay routinely submerged for 60 days, BEN
FRANKLIN’s 30-day submergence was no re-
cord-breaker. However, a nuclear submarine,
in regards to life support, differs from BEN
FRANKLIN in the following: It extracts oxy-
gen from seawater; it removes carbon diox-
ide through a process not requiring vast
stores of scrubbing compound; trace contam-
inants are automatically monitored and con-
trolled; heaters and air conditioning control
the atmosphere; food is stored and prepared
as it is on surface ships; water is manufac-
tured onboard; metabolic wastes are stored
and then dumped overboard; and space,
though not overexcessive, is in greater abun-
dance. The reason for these differences re-
sides in a nuclear submarine’s abundant
electrical power and great size relative to
the 750-kwh, 49-foot-long BEN FRANKLIN.

The operation and success of BEN FRANK-
LIN’s life support and a variety of other
human aspects in deep submergence are
analyzed in detail in a five-volume report
prepared by Grumman Aerospace for NASA;

the following information and figures were
extracted from these (ref. 16 and ref. 17) and
from personal experiences of the author. A
collection of photographs showing various
features and activities during the drift is

Fig. 9.19 Assorted activities aboard BEN FRANKLIN during and prior to its 30-day drift in July-August 1969.
a) Interior view looking forward from the aft hemi-head. (Grumman Aerospace Corp.)

439

b) Co-pilot Erwin Abersold at work in the forward hemi-head (wardroom).
Also shown is the LOH panel and bags of silica gel. (NAVOCEANO)

d) NASA crewman Chester May with a Drager tube. (NAVOCEANO)

440

e) Venting off liquid oxygen at West Palm Beach, Fla. (NAVOCEANO)

a

f) Crewman at the forward viewports during a bottom excursion. (NAVOCEANO)

441

g) Hot water tanks and galley area. (Grumman Aerospace Corp.)

442

h) Oceanographer Kenneth Haigh in scientific area. Silica gel bags hang overhead. (NAVOCEANO)

443

—

|) Jacques Piccard and Abersold with a hollow glass sphere filled with biological samples and locked out of the vehicle for retrieval by the support ship. (NAVOCEANO)

presented in Figure 9.19. A list of the atmos-
pheric monitoring and instruments and their
application is shown in Table 9.7, and the
interior layout of the vehicle is in Figure
9.20.

Carbon Dioxide Removal

Carbon dioxide removal was performed
without electric power by absorption on
LiOH panels strategically located through-
out the vehicle. Diffusive and natural con-
vection currents circulated the atmosphere
through the panels. Three portable blowers
were included as part of the system to be
used to aid in circulation during those pe-
riods in which natural convection was not
adequate.

Once the vessel was sealed, carbon dioxide
readings were taken every 4 hours with a

444

Dwyer Analyzer. This instrument failed and
a Fyrite Analyzer and a CO, Drager tube
were used instead.

Oxygen Supply and Regulation

Oxygen was stored as a cryogenic liquid in
two standard Linde LC-8GL cylinders, each
holding up to 250 pounds. Operation of the
system required that oxygen consumption be
greater than normal oxygen boiloff to pre-
vent a hazardous buildup in oxygen partial
pressure. Normal boiloff is approximately
3.75 pounds/tank/day.

Temperature Control

Because of moderate Gulfstream tempera-
tures (average water temperature 59°F),
temperature control for the mission was pas-
sive. Using the sea as a heat sink, bare
sections of the hull’s interior surface con-
ducted heat out of the vessel. Internal tem-

TABLE 9.7 ENVIRONMENTAL MEASUREMENTS [FROM REF.(16)]

Power
Item Reading Freq Instrument Operation Watts
Oxygen Percent 2 hrs Teledyne 0, Sensor Continuous 0
Carbon Dioxide Percent 4 hrs Fyrite CO, Analyzer Manual 0
Pressure Atmosphere 4 hrs Pressure Gage Continuous 0
Temperature
Internal ° Fahrenheit 4 hrs Abeon-Gage Continuous 0
External ° Centigrade 4 hrs Trub, Tauber, Cie Gage Continuous 0
Relative Humidity Percent 4 hrs Abeon-Gage Continuous 0
Trace Contaminants
°Metabolic *PPM 24 hrs Drager Gas Detector Tubes Manual 0
° Other *PPM 1 wk Drager Gas Detector Tubes Manual 0
Oxygen
Nitrogen
Carbon Dioxide
Carbon Monoxide *PPM 72 hrs UNICO-PGC-Series/O Gas Chromatograph Manual 200 (1 hr)

Methane
Hydrogen Sulfide

Hydrogen

*Parts per million

peratures during the mission were shown in
Figure 9.9, and the effectiveness of the tem-
perature control method has been discussed.

Humidity Control

Humidity control was accomplished pas-
sively by allowing moisture to condense on
the bare sections of the hull’s interior. As the
moisture was condensed on the hull it ran
into a catch trough which carried it into the
waste water storage tank. A small dehumidi-
fier was available but was not used. A 3,600-
pound supply of silica gel in 5-pound bags

445

served to absorb moisture. The results of this
method were also discussed and graphed on
Figure 9.9.

Atmospheric Pressure

Under normal operating conditions, the in-
ternal pressure of BEN FRANKLIN varied
from a low of 13.5 psia to a high of 16 psia.
These changes can be expected when the sea
level temperature varies greatly from vehi-
cle interior temperature. Slight pressure
changes of 10 to 25 mmHg can be incurred by
normal variations in O, CO,, and H,O partial

oa HATCH TRANSFER/LOCK-OUT
5 eee

a FORWARD HATCH
PORTABLE LADDER COGKENIIA

Ov ——a
pata

aan
| gel

TRIM TANK wae BUNK DISTRIBUTION
WASTE TANKS PANEL

TRIM TANK

COCKPIT
\

eS

WORK AREA LAVATORY DISTRIBUTION PANEL

REMOVABLE LOCKERS | | guip oxycen Tanks 'NYERTERS | Quip OxYGEN TANK

fe oe sce
aire L iret es ae
| WATERTANKS™ (SQ

HB)

se a a
\—8) WATER TANKS WATER TANKS

SHOWER OBSERVATION AREA
AND MESS

Fig. 9.20 Interior layout of BEN FRANKLIN. [From Ref. (16)]

pressure. Pressure was indicated by a heli- —Periodie active removal by the portable
coid compound pressure gage. contaminant removal system (operated
as needed) containing Kalite, Hopcalite

Contaminant Removal and Acamite cannisters.

Contaminant removal was accomplished in Contaminants removed by each of the above

the following manner: are the following:

—Continuous passive removal of contami- —LiOH—In addition to its primary func-
nants by LiOH and activated charcoal, tion of removing CO,, LiOH also removed
both of which are provided in the CO, acid fumes such as hydrochloric acid and
removal panels. hydrogen sulfide.

—Intermittent active removal of contami- —Activated charcoal—A small quantity of
nants by the odor removal (Purafil) car- activated charcoal was provided along
tridge in the toilet. with the LiOH in the CO, scrubbing

446

panel and in each of the portable con-
taminant removal system cannisters. It
absorbed organic vapors, odors and am-
monia.

—Purafil—This material is pelletized acti-
vated alumina impregnated with potas-
sium permanganate. Purafil removed
odors, organic vapors, organic acids,
phenols, sulfides, and nitrogen oxides.

—Hopcalite—A catalyst with the primary
function of oxidizing carbon monoxide to
carbon dioxide (also handled aldehydes,
alcohols, etc.).

—Acamite—Absorbed alkaline fumes (NH;)
and also acted as a drier.

—Kalite—Absorbed acid fumes (HCl, H,S,
etc.).

Waste Management System

The waste management system chemically
treated and stored metabolic wastes onboard
the vessel. As the toilet flushed, germicide
was automatically metered into the exit
stream. The wastes then entered a macera-
tor where they were simultaneously pulver-
ized and thoroughly mixed with the germi-
cide. The treated wastes were held in the
macerator between toilet uses. It was during
this period that biological organisms were
inactivated. Wastes were then pumped from
the macerator into the waste storage tank
where they remained.

Toilet odors were handled by a blower
which drew air through a cannister filled
with Purafil. Storage tank odors were han-
dled by a vent line that fed into the odor
removal cannister. Two waste tanks were
installed—a “‘mini waste”’ tank and a “waste
storage” tank. The mini waste tank collected
water from the three sinks and shower. This
tank stowed the water for use in flushing the
toilet.

Contaminant Detection

Trace contaminant detection was accom-
plished with Drager type gas detector tubes,
a method requiring no power. Forty different
tubes, many of which detect more than one
contaminant, were available. Measurements
were made by breaking the tops off of the
tubes and inserting the tubes into a hand
operated bellows pump.

447

Atmosphere Exchange System
The function of the atmosphere exchange
system was to purge the vehicle’s atmos-
phere and replenish it with fresh air. The
system consisted of a portable blower at-
tached to approximately 30 feet of flexible
ducting. The system was to be used when:
—Smoke due to a fire or insulation break-
down filled the vehicle.
—The carbon dioxide level reached 3.0 per-
cent.
—The oxygen partial pressure reached a
hazardous level.
—A trace contaminant level built up and
could not be removed by the contami-
nant removal system.

Potable Water System

The potable water supply consisted of both
hot and cold water (Fig. 9.21). The cold water
was stored in four saddle tanks each of which
held approximately 95 gallons and the hot
water was stored in four super insulated
tanks each of which held 50 gallons. The
tanks were initially filled with cold fresh
water from dockside. Two inline filters re-
moved gross particles and bacteria. A second
bacterial filtering was performed as water
was drawn from the cold water tanks by
another filter on the cold water discharge
line. Hot water was prepared by using the
electric immersion heaters in the insulated
tanks.

Food

The food supply on BEN FRANKLIN con-
sisted of commercially obtained freeze-dried
meals, the preparation of which entailed
mixing with water. Five different menus for

COLD WATER COLD WATER RESERVE

HOT WATER

TOILET GALLEY
@ BACTERIAL FILTER

Fig. 9.21 Water management system on BEN FRANKLIN. [From Ref. (16)]

breakfast, lunch, dinner and snacks were

provided. A sample for each is shown below.

The results of BEN FRANKLIN’s life sup-
port system, as mentioned, are thoroughly
and exhaustively discussed in reference (16),
and the reader is referred to these analyses
for detailed information. Therefore, only
highlights of the various life support fea-
tures follow.

A plot of oxygen level, carbon dioxide and
cabin pressure throughout the mission (Fig.
9.22) shows that the oxygen level remained
between 19.5 and 22 percent. All adjustments
were made manually with the flowmeter.
The automatic control, originally part of the
system, was disconnected to eliminate the
need for an inverter and thus conserve elec-
trical energy.

The carbon dioxide level was maintained
between 0.4 and 1.5 percent. The anticipated
buildup rate scheduled that the LiOH panels
be changed every 2.5 days; but, the actual

need was closer to every 3 days. Subsequent
analysis yielded a carbon dioxide generation
rate of approximately 1.7 pounds per man
day.

Atmospheric pressure ranged between a
low of 1.01 atmospheres at the start of the
mission to a high of 1.12 atmospheres. The
highs occurred twice, once when the boat
surfaced and was under tow, and again at
the end of the mission. After the first day, a
slight air leak in the pressure regulator from
the variable ballast tanks was detected and
corrected. Cabin pressure then increased to
1.025 atmospheres. Subsequent variations
were due to temperature changes which cor-
relate with ambient temperature at various
depths.

Temperature and humidity variations
have been discussed. It is significant that
the data evaluators recommended insulation
and heaters for cold water work.

Throughout the mission, contaminants
were checked on a daily and a weekly basis.
After some 5 days, carbon monoxide started

1.12 1.12 ATA
< al
< 1.08
ee AIR LEAK AIR PRESSURE zal
D CORRECTED

1.04
= al
oe

1.01 ATA

1.00

15 1.5%
: sere
ea
S 1.0
7) 050
8 Ae
oO

0
22 ' 22%
: : ia Seneene
a 21 /
Oo
: le \
a 20 A ~
eS
19
iF 2/3 4/5 6/7 8] 9 10/11.12]13 eer 19 20] 21 22/23 24|25 26| 27 28
18

MISSION DURATION, DAYS

Fig. 9.22 Log of air pressure, CO and O2 inside BEN FRANKLIN. [From Ref. (16)]

448

to show up (8 ppm). The carbon monoxide
level continued to rise and when it reached
20 ppm the active contaminant removal sys-
tem was operated, but with no effect. The
level continued to build up and by mission
end it was 40 ppm. The carbon monoxide
level projected for the 6-man, 30-day mission
was approximately 34 ppm. In the first full
contaminant check (Day 8) a trace (0.2 ppm)
of ammonia and 200 ppm of acetone were
detected. Periodic rechecking of these two
items throughout the mission showed little
change.

Cold water was used primarily for personal
hygiene and for washing dishes (1 gal/day).
Very little cold water was consumed in drink
or food preparation primarily due to the cool
temperature of the vessel and the repugnant
taste of the iodine-treated water. In fact,
cold water consumption was so low that it
was necessary to run it periodically just to
keep the mini waste tank from going dry.

The mission was started with two of the
four hot water tanks not working properly,
in that the vacuum had been lost, and the
tanks cooled rapidly. Water was drawn from
one of the defective tanks on the first day,
after which it was necessary to switch to the
two good tanks. Approximately 20 to 22 days
later the hot water was depleted and it was
necessary to reheat water for food prepara-
tion.

Acceptance of the food by the crew was
varied. Many items were not enjoyed be-
cause the water was not hot enough to pre-
pare the food properly. A few of the items
were totally rejected on the basis of flavor or
consistency (biscuits, milk shakes, chocolate
bars). The overall consumption by the crew
was less than planned (about 2,300 calories
per day) and four of the six crew members
lost an average of 11 pounds each, while two
showed no change. Of the four who lost
weight, one used the mission as an opportu-
nity to diet and two others drew heavily from
their personal cache of dried fruit and nuts,
using the freeze-dried foods for dinner only.

The 30-day drift of BEN FRANKLIN pro-
vides the only data available for long-term
life support in a contemporary submersible.
While this submersible’s life support system
may not be the ultimate, it did provide all
requirements for the crew who emerged in

449

good health and good spirits. For this reason
one might consider utilizing various life
support features of BEN FRANKLIN in pres-
ent or future vehicles.

HABIT rABILITY

Mr. Wesley Blair of Lockheed Corporation
presented a comparison of the space availa-
ble (free volume) per occupant in several
submersibles versus the space available in a
variety of other familiar human habitations
(18). Blair’s comparison is reprinted in Fig-
ure 9.23 and shows, for example, that a com-
mercial coffin offers more free volume than
the bathyscaph TRIESTE; the other sub-
mersibles in this figure barely exceed the
coffin’s volume.

Of the small contemporary vehicles, Texas
A&M’s PC-14 is more or less representative
of volume available, and a glance at the
observer’s position in Figure 9.24 reveals
that space is at a premium. Shifting our
attention to the interior of PC-8 (Fig. 9.25),
which is similar in diameter to PC-14, a wide
variety of hard, sharp projections are seen
from which the occupants will undoubtedly
receive several whacks, bumps, pricks and
jolts before the dive is over. The Perry vehi-
cles are not unique, however, in their poten-
tial for discomfort, for all small submersibles
offer similar jarring possibilities.

Rather surprising is the fact that even the
large vehicles offer little in the way of hu-
man comfort. BEN FRANKLIN, for example,
had a metal escape trunk in the stern that
projected some 2 to 3 feet down into the
pressure hull when in a stored condition. The
hard, unforgiving nature of the trunk’s rim
was sorely researched and evaluated on the
head and shoulders of the occupants until
relief, in part, arrived in the form of foam
rubber padding.

In the very small vehicles, such as TECH-
DIVER (PC-3B), head-bumping, knee-crack-
ing and shoulder-whacking are much re-
duced, because the internal volume is so
small that the occupants are forced to sit
still until the need to stretch becomes almost
unbearable.

The point being made, unfortunately, is
that manned submersibles are not designed
for comfort, and the smaller the vehicle, the

1000

ie

uw

2

<x

=) ) too

5 VOSTOK
ie)

>

Ww

w MERCURY
Te @

STAR III
e

e
DSRV

e
ALVIN DEEP

QUEST

e
TRIESTE

NAVY RECOMMENDATION FOR SHIPS

FEDERAL PRISON CELL
NUCLEAR SUBMARINE

e
APOLLO

GEMINI IV

@ GEMINI VII

®
GEMINI V

COMMERCIAL COFFIN

DURATION — DAYS

Fig. 9.23 Comparison of operator free volume in various manned systems. [From Ref. (18)]

more this fact becomes apparent. While most
designers take great pains to sustain life,
they have made few attempts, beyond pro-
viding foam rubber cushions, to make life
comfortable.

Such considerations may seem trivial in
view of the fact that the dive may last only
for several hours. But, several hours may
seem interminable when one is required to
spend them in a position such as the ob-
server is required to maintain in ASHERAH
(Fig. 9.26). It is not difficult to imagine that
the human’s ability to endure this position
will expire far more rapidly than will the
electrical or life support endurance. The ad-
vent of the acrylic plastic hull and bow dome
has gone far to alleviate the problem, but
there is still much room for improvement.

450

The most reasonable approach to human
factors design is through the use of mockups
of the pressure hull and its equipment. With
mockups the operator and observer can
physically test the vehicle to determine its
comfort and the accessibility of instruments
and controls. One approach is in Figure 9.27,
wherein the endostructure of STAR III is
shown with seats and a portion of the moni-
toring panel. This endostructure was de-
signed to be dismantled and later reassem-
bled within the pressure hull. The associated
panels, equipment, etc., could, therefore, be
mounted to simulate the exact physical ar-
rangements within the pressure hull. An-
other example is shown in Figure 9.28, which
is a simulated mockup of the second JOHN-
SON SEA LINK’s acrylic plastic hull.

Fig. 9.26 Pilot and observer's positions as envisioned for ASHERAH. (Gen. Dyn
Corp.)

The mockup approach not only assures
that the passengers will fit in the pressure
hull, but that equipment will fit also.
Through trial and error the final arrange-
ments are derived. One answer not provided,
however, is that of ambience—noise, for ex-

Fig. 9.24 The forward section of PC-74 with bow dome removed

4

Fig. 9.25 Interior view of PC-8. (Perry Sub. Builders) Fig. 9.27 STAR III's endostructure in initial layout stage. (Gen. Dyn. Corp.)

451

Fig. 9.28 Mockup for second JOHNSON SEA LINK acrylic sphere.

ample—during operations and the suitability
of this arrangement in terms of sustained
comfort.

The only reported attempt at producing
order out of this chaos is related by Blair in a
paper describing some of the ‘“‘manned” con-
siderations that went into the design of the
DSRV and the Deep Submergence Search
Vehicles (DSSV).

Blair discusses DSRV’s human considera-
tions in terms of problems peculiar to the
rescue vehicle’s mission of the loading, seat-
ing, restraining and disembarking of able
and disabled rescuees. His discussion of the
DSSV’s considerations, however, has applica-
tion to all submersibles engaging in search,
survey or inspection missions.

In order to assess the search efficiency of a
four-man crew in a 9-foot 5-inch-diameter
sphere, a DSSV mockup was constructed and

452

manned for a typical 34-hour mission. Ar-
rangements were made to simulate varia-
tions in pitch, speed and altitude while a
video, TV image of the ocean floor, on which
two small targets (mines and telebuoys) were
superimposed, was continuously presented
at a central viewport.

The results of this simulation are quite
interesting. To obtain a goal of 80 percent
detection accuracy, a 1l-hour watch at the
viewport was found to be too long and 2
consecutive hours of sleep between watches
were too short. A minimum volume of 400
cubic feet for four crewmen was adequate,
and this allowed for inclusion of a fifth crew-
man who was found to be necessary in order
to realize the desired detection accuracy.

Historical data presented by Blair is also

germane. Based on performance studies of
radar and asdic (sonar) operators in the late
1940’s, a 1/2-hour watch increment was thor-
oughly documented (19) and showed that the
percentage of targets missed increased by
some 15 percent at the end of a ?/2-hour
watch while the total missed targets in-
creased by 20 percent at the end of 2 hours.
- The implications of Blair’s results are
quite compelling: Under the best designed
viewing position the observers still missed a
significant portion of targets during a 1-hour
watch. One can only speculate, but in the
viewing position shown in Figure 9.26, it
would seem that an incredibly high percent-
age of targets would be missed on a 6- to 8-
hour dive in this position. In view of the fact
that many current vehicles are performing
pipeline and cable inspections, which require
several hours at the viewport, such degrada-
tion in the observer’s performance must be
taken into account.

At this point it seems appropriate to dis-
cuss viewport location as it pertains to habit-
ability, not only because the greatest degree
of discomfort is found in submersibles’ view-
ing arrangements, but also because direct
viewing of the environment is the raison
d ’étre of manned submersibles. For this
reason it is difficult to separate habitability
from efficiency and impossible to speak of
either without discussing viewport location.

The Continuing Saga Of The ‘“‘Best
View”

In the decade of the sixties the major users
of submersibles were scientists: The pilots
were responsible for the safety of the scien-
tists and for maneuvering the vehicle as
directed by their passengers. A great deal of
the scientific work consisted of observing or
sampling the bottom and/or its animal life.
When the operator was required to cruise
within a foot or two of the bottom or poke
around in narrow submarine canyons, he
wanted and got the best—and sometimes the
only—view of the very things the scientist
was paying to see. When the dive terminated
and the scientist was debriefed or wrote his
critique, invariably the complaint arose,
“The pilot always gets the best view!” This
placed the designer on the horns of a di-
lemma: If the operator is responsible for the
safety of the vehicle and its occupants, then
how can you find fault if he pre-empts the
scientist at the viewport when maneuvering
within and around potentially dangerous ob-
stacles? On the other hand, the scientist was
a paying customer; if he’s dissatisfied with
playing second fiddle to the pilot, then he
might take his business elsewhere. A solu-
tion, of sorts, was found by using forward-
looking outboard television cameras which
the pilot monitored while the scientist used
the viewport. But, once again, when the
going got particularly rough the scientist
was obliged to yield the viewport.

The questions to be resolved, then, are:
What is the best view and how do you pro-
vide it for both operator and scientist? The
answers depend upon the vehicle’s tasks, its
operating depth and its pressure hull dimen-
sions.

One basic flaw in most early vehicles was
that they were envisioned to be all things to
all men. When they weren’t carrying scien-
tific passengers they would carry engineers,
and when they carried neither of these, the
operator himself would be the data-gather-
ing or task-conducting human element. In all
cases the operator must have as good a view
as possible to maneuver safely. In midwater
the problem is fairly simple, by monitoring
the obstacle avoidance sonar the pilot can

453

relinquish direct viewing to the passengers.
But, near the bottom, complications arise.
When moving forward, the best view is for-
ward and down; when ascending upward
along the face of a cliff, the best view is
forward and upward. In a narrow canyon the
best view is forward, upward, left and right.

It is apparent then, that viewports are
really needed everywhere, but this is not
feasible for several reasons, the most impor-
tant being that the structural integrity of
the pressure hull must be maintained. In
Chapter 5 we saw that if a viewport penetra-
tion is cut, the material taken out has to be
replaced by an equal amount of reinforce-
ment; furthermore, there is a dimensional
limit controlling the proximity of viewports
to each other while still maintaining hull
integrity. One solution is to make the hull
thicker and larger, but the penalty is extra
weight and cost. Another solution is to de-
crease operating depth, not always accepta-
ble if the market shows a need for greater
depth. Such trade-offs accompany every solu-
tion. Finally, the problem resolved itself by
virtue of operating depth and technology.
Let us start with the deeper (6,000-ft) vehi-
cles and work our way upward.

ALVIN’s viewport locations (Fig. 9.29a) are
fairly typical of its deep diving counterparts:
One looks forward, two look obliquely left
and right at a slight down angle and one
looks directly down. Another, much smaller,
viewport is in the hatch cover and looks
directly upward. The viewing effectiveness
in this arrangement depends upon the mis-
sion. If the task is to search for an object, the
pilot while piloting can perform this by look-
ing forward while the occupants look out to
the side. On the other hand, if geological
observations are required, then the best
view is generally forward and this introduces
competition between pilot and scientist. The
scientist can always use the downward view-
port, but he does so by sticking his head
between the pilot’s feet. Fortunately, there
are at least several viewing options and
though they may not be considered first-rate
by the scientist, TRIESTE I’s single view-
port was abysmal by comparison.

Proceeding upward in depth takes us to
the DEEPSTAR series and all Cousteau-de-

Fig. 9.29 Viewport arrangements on; a) ALVIN and b) DS-4000. (WHOI; U.S. Navy)

signed vehicles of this class. Cousteau de-
cided early that the primary design goal was
photography and viewing, and he met this
goal admirably. Figure 9.29b shows DS-
4000's bow—the two large viewports are 16
degrees from the vertical centerline and look
downward 21 degrees from the horizontal.

454

The field of view, in water, is 74 degrees from
each viewport with an overlap of some 42
degrees. This arrangement provides both the
pilot and the scientist virtually the same
view. The solution is an excellent one for this
depth vehicle. Particularly attractive is the
smaller viewport above and between the two

Fig. 9.29 DEEPSTAR-4000.

large ones. The interior is configured to al-
low the mounting of a movie camera which
can be operated merely by pressing a button.
The camera is looking essentially at the
same scene as is the observer; aiming is not
a problem, and the push-button feature elim-
inates the difficulties inherent in handling
cameras within the submersible’s small con-
fines. Provisions are made for both pilot and
observer to lie down on padded, contour
couches.

455

In shallow diving vehicles reduced ambient
pressure and technological advancements al-
low both operator and observer a comforta-
ble position and excellent (non-competitive)
viewing. Probably here, more than in any
other aspect of submersibles, a trend can be
seen in vehicle design.

Initially, most shallow vehicle builders at-
tacked the problem by incorporating as
many viewports as the structural integrity
could stand and the occupants could possibly

use. John Perry’s SHELF DIVER (Fig. 9.30a)
with 25 viewports is an example of this ap-
proach. Virtually any direction may be
viewed with little or no reorientation of the
vehicle. BEN FRANKLIN followed the same
approach with 29 viewports, though several
of these are so difficult to get to that they
are, for all practical purposes, unusable.

An earlier approach to panoramic viewing
by Martine’s Diving Bells of San Diego incor-
porated plastic wrap-around viewports (Fig.
9.30b). This configuration is acceptable on
the shallow-diving SUBMANAUT and the
view from inside is quite similar to that from
within an automobile. Possibly because of
the then (1956) unknown characteristics of

Fig. 9.30 a) SHELF DIVER, b) SUBMANAUT, c) NEMO and d) PC-8 viewing arrangements. (a&b Perry Submarine Builders; c&d U.S. Navy)

acrylic plastic other shallow diving vehicles
continued to use either flat or conically-
shaped viewports. Shaping the viewports
into a wraparound geometry naturally costs
more than merely cutting it out of a flat
sheet; this also may have accounted for a
reluctance to follow Martine’s lead.

With the launching of NEMO in 1970 the

457

best and most comfortable view was finally
provided. The spherical plastic-hulled vehicle
(Fig. 9.30c) allowed both occupants a view in
virtually any direction while seated comfort-
ably in padded chairs. At this point in time
acrylic plastic had undergone extensive de-
velopment and testing, and its dependability
and safety as a hull material was amply

documented. Several subsequent vehicles fol-
lowed NEMO’s precedent: KUMUKAHI,
MAKAKAIT and JOHNSON SEA LINK.
Combining both the advantages of pano-
ramic viewing of a sphere and the other
advantages offered by a cylinder, Perry Sub-
marine Builders developed the plastic-nosed,
steel-hulled PC-8 (Fig. 9.30d), the first of

458

what is now five of this type vehicle. Conven-
tional viewports still ring the operator’s con-
ning tower, but the forward view is greatly
improved over the earlier designs. Comfort,
though better than in its predecessors, is
still not the ultimate. Owing to the small
diameter hull a 6-foot observer must remain
bent forward to view. Figure 9.30d is some-

4)

what misleading in this respect because the
two observers are young boys. Figure 9.24 is
a more realistic portrayal with a full-sized
adult in a similar-sized hull.

The 6,500-foot depth DOWB abandoned
viewports completely and went to an optical
viewing system instead. The system con-

459

sisted of two optical domes containing 180-
degree wide-angle lens assemblies mounted
top and bottom on the vehicle. Light gath-
ered by the domes was transmitted through
the hull into an optical relay tube and into a
central optical assembly where it was formed
into separate images for each observer. It

took some time for the observer to accustom
himself to the image received, for it was, in
effect, as if he were standing in the center of
a radar screen and seeing everything in
front, in back, above and to the sides all at
once. Corrective masking shades were in-
serted to block out everything but the for-
ward view which helped the newcomer to

met a

rT

orient himself. The seated observers each
had a telescope-like object through which to
view. The top dome was later moved forward
on the bow as shown in Figure 9.31.

Even the “best view” in many vehicles is
not 100 percent effective, because the posi-
tion the scientist or pilot has to take to get to
this view may be awkward and inordinately

Z ae

Fig. 9.31 DOWB's forward-viewing optical dome is located just right of its manipulator claw. (Gen. Motors.)

460

difficult to hold for any appreciable length of
time. Examine Figure 9.32 wherein the ob-
server is looking through the forward view-
port and both his knees and elbows are sup-
porting his weight. To record observations he
must write or use a tape recorder. Writing in
this position is out of the question; even
managing a tape recorder microphone be-

comes a chore. One might suggest hanging
the microphone in an appropriate position
and leaving it on for the entire dive. This
solution then requires an equal amount of
time after the dive (possibly 6 to 8 hours) to
transcribe the recordings; not too efficient a
solution considering the many chores be-
tween dives.

Fig. 9.32 The observer's position in STAR II/. (U.S. Navy)

461

Another aspect of the viewing position in
Figure 9.32 is the contact between skull and
steel. In Figure 9.8 the observer is wearing a
headband consisting of tape and a large
piece of foam rubber. The reason for the
foam rubber is not immediately obvious, but
after a few minutes of viewing, it is natural
for the observer to rest his forehead against
the viewport rim and his face up against the
plastic window. Very shortly his forehead
becomes cold and painful. A number of varia-
tions of this headband are found on other
vehicles. ALVIN’s pilots, for example, wore
berets which—in addition to providing a dra-
matic flair—served the very practical pur-
pose of a cushion when pulled down over the
forehead. Some designers rimmed the view-
port with foam rubber. As long as the foam
was changed frequently this solution was
acceptable, but if it was not changed, it be-
came quite rank with the cumulative sweat
of the previous occupant.

The problems in viewing and comfort could
be listed ad infinitum, but they all seem
reduceable to a common denominator: Man’s
anatomy was an afterthought. While great
pains have been taken, on the whole, to make
it easy for him to operate the vehicle and
survive, virtually nothing has been done to
make him comfortable at the viewport.
Strangely while much thought goes into the
best viewport location, it appears that little
at all has gone into the process of actually
looking out of it. The budding designer would
do himself and any prospective users a great
service by simulating the position(s) he an-
ticipates will be required to view for the
same period of time he will be asking of
others. Had this been done in the past, sub-
mersible designers would have discovered
that pain hurts. If this seems facetious, ex-
amine the positions the observers must take
in Figure 9.33 and then simulate these posi-
tions for an hour or two. It will soon become
painfully apparent that someone has overes-
timated the human’s capacity to endure.

Other than habitability in regards to view-
ing, other aspects of human comfort are mi-
nute by comparison. Quite naturally, a small
sphere or cylinder packed with equipment
and people has inherent discomforts, but
these are bearable for the short periods in-
volved. There are a few aspects, nonetheless,

462

that do bear on the occupant’s efficiency
which are present in the smaller submers-
ibles.

Noise

The noise level in small submersibles is
generally tolerable, but at times it can inter-
fere with communications. Pollio (20) reports
that in order to understand surface tele-
phone transmissions on STAR III, it was
sometimes necessary to shut down all mo-
tors, the AC-DC converter and the carbon
dioxide scrubber.

Temperature Layering

While electronics operating within the
pressure hull can generate needed heat, this
heat may tend to stratify and create uncom-
fortable conditions. Pollio bid.) reports a
ceiling temperature of 90°F versus a floor
temperature of 65°F while operating off the
Florida Keys. Redirection of the scrubber
exhaust was recommended, but small fans
blowing against the bottom of the hull would
serve as well. In instances where high tem-
peratures prevail, a small fan can mean the
difference between a tolerable and an incre-
dibly difficult environment. During a night
dive in PC-3B in the Bahamas, a small circu-
lating fan was inoperative; the ambience
within was strikingly similar to a sauna
bath. But, prior to and following this dive,
the fan was operating and the slight breeze
it created made conditions quite comfortable.

Lighting

While illumination is generally sufficient
to monitor gages, instruments, etc., it is gen-
erally insufficient for writing and, in combi-
nation with the cramped quarters, presents
a strong argument for taped records.

The foregoing discussion on habitability
has been, in the main, a criticism rather
than a description. More unpardonable, per-
haps, is that no practical solutions have been
offered. However, considering the wide vari-
ety in shape and size of pressure hulls and
equipment therein, there is no single across-
the-board solution. The intention here is to
point out to future designers that human
comfort is a sorely needed improvement in
manned submersibles, and ignoring this
problem can seriously impair what otherwise
may be an excellent design.

DEEPSTAR 4000 STAR III
3-MAN 2-MAN
al) 2S
ALVIN
3-MAN

ALUMINAUT
6-MAN

Fig. 9.33 Viewing and operating positions in four submersibles.

Psychological Aspects

Some of the more interesting aspects of
manned submersibles are the psychological
effects of diving and the means used to
“weed out” those unsuited for such endeay-
ors. From time to time, consideration was
given to pre-dive psychological examina-
tions. The U.S. Navy went so far as to make
this a requirement for its diving civilians
and military personnel. At present, however,

463

the emphasis is primarily on physiological
rather than psychological soundness.

From a variety of sources (mainly opera-
tors) and personal observations, the follow-
ing statement can be made: If an individual
has a tendency towards claustrophobia or
has defin.te qualms about riding in a sub-
mersible, he simply does not go. This does
not imply that there is no nervousness; there
is, but people who embark have been either

so highly motivated or steely-nerved that
their nervousness has been kept under tight
control.

An interesting insight was provided in a
conversation with Mr. F. D. Barnett of Perry
Submarine Builders. Mr. Barnett described a
particularly difficult dive in Long Island
Sound during which the vehicle he was pilot-
ing was virtually at the mercy of extremely
swift bottom currents. At one point in the
dive he was pinned against a large boulder
and had to inch his way upward along its
face in order to break the current’s hold and
surface. Accompanying Mr. Barnett was an
individual who had never dived before, but
showed no signs whatsoever of nervousness
or panic. Discussing the dive after surfacing,
the passenger’s self-control was explained
when he evidenced surprise in learning that
such events were not commonplace. Perhaps
“Tgnorance is Bliss” was the answer in many
similar incidents.

The BEN FRANKLIN drift mission is not
too revealing in this respect because all of
those on board, except one, were experienced
submersible divers and no stress or danger-
ous situations occurred during the entire
drift. While there were a few incidents of
minor irritability between the occupants,
there was never a close approximation to-
ward a potentially dangerous human rela-
tionship situation. This is all the more inter-
esting because the crew was not selected for
their compatibility with each other, and the
background of this multi-national group
(two-Swiss, one-English, three-American)
was quite diverse. No doubt, the fact that
this was a first-of-a-kind endeavor had much
to do with the crew’s behavior. If, for exam-
ple, this had been the tenth or twentieth
such mission for this crew, the relationship
might not have been so compatible, but it
wasn’t, and the knowledge that one’s short-
comings as an “aquanaut” might be revealed
internationally on mass media had much to
do with getting along.

REFERENCES

1. Undersea Vehicle Committee, 1968
Safety and Operational Guidelines for
Undersea Vehicles. Mar. Tech. Soc.,
Wash., D.C.

2. U.S. Naval Materials Command 1973 Sys-

464

10.

He

12.

13.

14.

tem Certification Procedures and Crite-

ria Manual for Deep Submergence Sys-
tems. Navmat P-9290, Wash., D.C.

. American Bureau of Shipping 1968

Guide for the Classification of Manned
Submersibles. New York.

. Eliot, F. 1967 The design and construc-

tion of DEEPSTAR-2000. Trans. 3rd
Ann. Conf. & Exhibit. Mar. Tech. Soce., 5-
7 June 1967, San Diego, Calif., p. 479-482.

. Beving, D.V. and Duddleston, R. J. 1970

Submersible life support components
and systems. Naval Engineers Jour., v.
S2onee ap aco—ole

. Report of the JOHNSON-SEA-LINK Ex-

pert Review Panel to the Secretary of
the Smithsonian Institution. 21 Dec.,
1973:

. U.S. Navy Diving Gas Manual. 2nd Edi-

tion, NAVSHIPS 0994—003-7010, Sup.
Div., June 1971.

. Boryta and Maas 1971 Factors influenc-

ing rate of carbon dioxide reaction with
lithium hydroxide. I&EC Process Design
and Developments, v. 10, p. 489.

. Presti, J.. Wallman, H. and Petrocelli, A.

1967 Superoxide life support system for
submersibles. Undersea Tech., June 1967,
p. 20-21.

Ianuzzi, A. P. 1966 The development of
an integrated life support system for the
deep diving research submersible DS-
4000. Trans. 2nd Ann. Mar. Tech. Soe.
Conf. & Exhibit, 27-29 June 1966, p. 436-
463.

Bioastronautics Data Book 1964 NASA
SP-3006, Scientific and Technical Infor-
mation Div., NASA, Wash., D.C., 399pp.
Merrifield, R. 1969 Undersea Studies
With the Deep Research Vehicle DEEP-
STAR-4000. IR 69-15, U.S. Naval Ocean-
ographic Office, Wash., D.C., 82 pp. (un-
published manuscript)

Talkington, H. R. and Murphy, D. W.
1972 Transparent Hull Submersibles
and the MAKAKAI. NURDC, Report
NUC TP 23, San Diego, 26 pp.

Murphy, D. W., Knapp, R. H., Buecher, R.
W., Beaman, G. R. and Hightower, J. D.
1970 A Systems Description of the Trans-
parent Hulled Submersible MAKAKAI.
NURDC, Kailua, Hawaii. (unpublished
manuscript)

15.

16.

Daubin, 8S. C. 1967 The Deep Ocean
Work Boat (DOWB) an advanced deep
submergence vehicle. Paper No. 67-370,
AIAA/SNAME Advanced Marine Vehicle
Meeting, Norfolk, Va., 22 May 1967.
Grumman Aerospace Corp., Bethpage,
N.Y. 1970 Use of the BEN FRANKLIN
Submersible as a Space Station Analog.
NASA Contract NAS 8-30172.

Vol. I, Summary Technical Rept.,
OSR-70-4

Vol. II, Psychology and Physiology.
OSR-70-5

Vol. III, Habitability. OSR-70-6

Vol. IV, Microbiology. OSR-70-7

Vol. V, Maintainability. OSR-70-8

465

17. Dolan, F. J. BEN FRANKLIN Gulf

18.

iG).

20.

Stream Drift Mission Report. Grumman
Aerospace Corp., Rept. OSR-69-19, Beth-
page, N.Y.

Blair, W. C. 1969 Human factors in deep
submergence vehicles. Mar. Tech. Soc.
MOR, Wes Bh 1 Bh 1h HZ,

Mackworth, N. Y. 1950 Research on the
Measurement of Human Performance.
Medical Res. Council Sp. Rept. Series
268, H.M. Stationary Office, London. (in
Blair 1969)

Pollio, J. 1968 Undersea Studies With the
Deep Research Vehicle STAR III. U.S.
Naval Oceanographic Office, IR No. 68-
103, 73 pp. (unpublished manuscript)

OPERATIONAL EQUIPMENT,
NAVIGATION, MANIPULATORS

Components of manned submersibles
which make them dive and move and fea-
tures which keep the occupant dry and alive
and provide an outside view have been de-
scribed. To these must be added equipments
and devices necessary to answer such ques-
tions as: How are we doing and where are we
going? The former question is answered by
equipment carried on each dive which gives
the operator information regarding the envi-
ronment and the vehicle itself. The latter
question is answered by navigational sys-
tems telling him where to go, where he is and
where he’s been. The last topic of this chap-
ter deals with manipulators or mechanical
arms, which provide the vehicle with manual
dexterity approximating that of the human

467

hand and arm, though often many times
stronger.

OPERATIONAL EQUIPMENT

The devices an individual submersible car-
ries to inform the operator of things external
and internal to his craft vary widely from
vehicle-to-vehicle. On a few only the vehicle’s
depth is supplied; on others virtually every
parameter imaginable is measured and dis-
played. Some devices, such as underwater
telephones and lights, are not data gatherers
per se, but serve instead to assist the vehicle
in operating safely and performing its mis-
sion. Others serve to inform the operator of
the status of his vehicle’s electric power,

deballasting air, breathing gasses, etc. Still
others provide information on speed, atti-
tude and watertight integrity. In essence,
they are extensions of the operator’s senses,
but the variety and quality of such augmen-
tation are a matter of operating philosophy,
mission requirements and financial re-
sources.

Operational instruments and devices are
categorized by function in Table 10.1. Only a
very few vehicles carry all of the instru-
ments listed, but at least one and usually
several are found on each. The majority of
these instruments directly relate to diving
safety and also may play a major role in
rescue. Consequently, their role in this re-
spect is dealt with in Chapter 14, and some
reiteration of the following discussion may
be found therein. Life support monitoring
and control are discussed in the preceding
chapter and are not treated further.

Environmental Information

Cruising on or near the bottom of the
ocean is a task accompanied by many un-
knowns. While the location and configuration
of major topographic features are generally
known, the location or presence of boulders,
low escarpments, wrecks and junk is sparse.
Therefore, all deep-diving and many shallow-
diving submersibles carry devices to provide
the operator with ample warning that some-
thing is coming into or near his course. It is
difficult to judge underwater visibility
ranges from submersibles, but 50 to 70 feet
under artificial lighting is probably the best
one can expect under clear-water conditions
and when the lights are fixed to the vehicle.

In some shallow ocean areas where the
water is extremely clear, the natural light
visibility range may be two or more times as
great. Consequently, devices are provided to
extend the ability to “‘see’”’ beyond the limit
of human vision. Not only is this required for
safe maneuvering, but it is also a prerequi-
site to the search for and location of objects
on the sea floor, be they natural or man-
made. Long range “viewing” is supplied by
sonar or acoustic devices; short range by
television and the human eye.

Sonar:

Acoustic devices used on submersibles for
navigation and search are known by several
terms: Obstacle avoidance sonar, avoidance
sonar or CTFM (Continuous Transmission
Frequency Modulated) sonar. Regardless of
its name, its function is to look ahead or to
the side of the vehicle and alert the operator
to the presence of “things” lying proud of or
above the bottom. Two methods are in use: 1)
An echo sounder arranged to point forward
instead of down; and 2) a sonar capable of
scanning a sector up to 360 degrees around
the vehicle. Three examples will be dis-
cussed: DS-4000’s forward-looking echo
sounder, Wesmar Scanning Sonar and the
Straza Continuous Transmission Frequency
Modulated Sonar System. The last two are
the commercial brands found most fre-
quently on contemporary submersibles.

Echo Sounder—Mounted on the port side and
within the fairing of DS-4000 is a forward-
looking transducer electrically coupled with

TABLE 10.1 OPERATIONAL INSTRUMENTS AND DEVICES

Environmental Information Vehicle Control

Sonar Depth Indicators
Pulsed Altitude Indicators
CTFM Speed Indicators
High Frequency Distance Indicators

Pitch, Roll Indicators

Visual Heading Indicators
Television
Eyesight

468

Communications Vehicle Status
Radio Electric Power
Underwater Telephone Source & Rate
Sound-Powered Telephone Ground Detectors

Compressed Air
Source & Rate

Life Support
Source & Rate
Atmos. Monitors

Leak Indicators

a strip chart recorder within the hull. The
system is simply a conventional echo soun-
der which looks ahead instead of down. In
operation an acoustic pulse is transmitted
from the transducer. Conceptually, objects in
the pulse’s path which are capable of reflect-
ing the pulse will do so and the echo or
return pulse will be received by the trans-
ducer. The interval between signal output
and return of its echo is measured electroni-
cally and the distance to the object is com-
puted and displayed as a trace on the strip
chart recorder. On 23-kHz frequency the DS-
4000 system ranges out to 5,400 feet. Rela-
tive to CTFM sonar it is inexpensive, less
complex and requires less weight and inter-
nal volume. There are, however, disadvan-
tages to this system: In order to search or
sean in any direction but forward the vehicle
itself must be reoriented, and no information
is given as to form or shape of the object.
Furthermore, the cone or beam angle is wide
and, owing to beam spreading, there is no
selectivity in targets. In other words, the
closest reflecting object will produce the first
return or trace. Nonetheless, the forward
looking echo sounder served quite ade-
quately as an object detector on DS-4000,
and only the need for a better search capabil-
ity on a different task caused its replace-
ment.

Scanning Sonar—Western Marine Electronics
(WESMAR) manufactures a scanning sonar
used on all International Hydrodynamics-
built vehicles which serves for both obstacle
avoidance and search. The unit shown in
Figure 10.1 is an earlier model (SS100); a
later model (SS150) is aboard the Canadian
Armed Forces’ SDL-1. The SS150 has a
trainable transducer within an oil-filled
dome located on the bow (as in Fig. 10.1)
which can be elevated from down-vertical to
four degrees above the horizontal. The trans-
ducer can scan 360 degrees and a scan con-
trol feature allows the operator to scan a
particular sector anywhere within the 360
degrees. A 160-kHz pulse of 0.6 millisecond is
transmitted; 300 watts of power are used at
long range, and 100 watts at short range.

CTFM Sonar—In this sonar the transmitted
frequency is varied continuously in a linear
sawtooth pattern and the received frequency

469

from an echo-producing object arrives after a
short delay proportional to the range of the
object (1). Being a sonic device the principles
of ranging are similar to the echo sounder,
but there are important exceptions. To ob-
tain range with a conventional echo sounder
one must wait until each transmitted pulse
(all of the same frequency) is received before
the next one can be sent. Consequently, the
number of “looks” per unit time is governed
by distance to the object. With continuous
scanning at varying frequencies each re-
flected pulse is distinctly recognizable, and
therefore, the number of looks over a given
time period can be and is much greater. To
this is the added capability to train or rotate
the transmitting/receiving element through
360 degrees laterally about the vehicle and a
narrow beam pattern which is highly direc-
tional. These last two features can be incor-
porated into conventional echo sounders (the
WESMAR for example), but the use of vary-
ing and continuous frequencies at high angu-
lar scan rates is unique to the CTFM. The
range information for CTFM is presented
both visually on a cathode ray tube (CRT)
and aurally—the latter overriding as an ad-
ditional means of determining the echo char-
acteristics. Frequencies of CTFM’s can be
low (20 kHz) or high (1,000 kHz), but are
generally in the 70- to 90-kHz range.

The predominant CTFM found on Ameri-
can submersibles is manufactured by Straza
Industries, whose model 500 CTFM is used
on the U.S. Navy’s SEA CLIFF and TURTLE.
It operates on a frequency of 72 to 87 kHz,
scans at a rate of 25 degrees per second and
has a range of 10 to 1,500 yards. The details
of this system are presented in Table 10.2,
not as an endorsement of this particular
CTFM, but to provide an idea of CTFM’s
characteristics and capabilities. An earlier
Straza CTFM (model SM502A) is shown
aboard ALUMINAUT in Figure 10.2.

The Straza model 500 also has the ability
to receive and indicate bearing to marker
signals at 37 kHz, and in another mode can
trigger a sonar transducer to respond in the
40- to 50-kHz frequency band. This latter
feature indicates range and bearing to the
transponder(s) and may be used for undersea
navigation.

»
VIEWING LIGHT

\

“ SSN q\

Fig. 10.1 Western Marine Electronics’ (WESMAR) Model SS100 scanning sonar aboard P/SCES II/. (HYCO)

Acoustic Imaging —Under certain conditions
underwater visibility by optical means is im-
possible owing to turbid conditions (sus-
pended material). For such contingencies
acoustic devices have been developed which
can insonify objects and present an image on
a CRT quite analogous to optical viewing.
Investigators at Lockheed (7) described a
system developed for the DSRV which oper-
ates at a frequency of 2.5 megahertz (MHz)
and affords a real-time, high-resolution opti-
cal display of underwater objects or activi-
ties at ranges up to 30 feet. The DSRV’s
would employ acoustic imaging for mating
with or clearing debris from around the
hatch of a stricken submarine when optical

470

devices were ineffective. However, no results
of the system’s use in the field are available.

Visual:

For short range and detailed knowledge of
the external environment the human eye is
the most perceptive and trustworthy instru-
ment aboard a submersible. The effective-
ness of the eye is governed by ambient light
level, turbidity and, in the case of artificial
lighting, light location. On some vehicles di-
rect viewing, i.e., through viewports, is aug-
mented by television. Both direct (viewports)
and indirect (TV) viewing have their advan-
tages and disadvantages, and the factor
bearing most heavily on either system’s ef-

TABLE 10.2 CHARACTERISTICS OF THE STRAZA (MODEL 500) CTFM SONAR

Range 10 to 1,500 yards

Scan Rate 25 degrees per second

Operating Frequencies

Sonar 87 to 72 kc

Transponder Interrogation 87 to 72 kc

Transponder Receiving 55 to 40 kc

Marker Receiving 37 kc
Transducer Beam Patterns

Projector (horizontal) 60 degrees

Projector (vertical) 15 degrees

Hydrophone (horizontal) 2 degrees

Hydrophone (vertical) 15 degrees
Projector Source Level +90 db re 1 microbar at one yard
Receiving Sensitivity -40 db re 1 microbar

Target Detection

Zero db Target 500 yards
+25 db Target 1,000 yards
+50 db Target 1,500 yards

- Frequency Analyzer 40 channels, 50-cycles filter,
500 to 2,500-cycles band with

envelope detectors

fectiveness is lighting. The effectiveness of
direct viewing is also governed by viewport
location, which was discussed in the preced-
ing chapter. Assuming 20/20 vision of all
observers, there is little more that can be
discussed other than artificial light arrange-
ments and characteristics with regards to
direct viewing. The topics of this section,
therefore, are limited to lighting as it affects
visual observations and to television as an
adjunct to direct viewing.

Lighting —The varieties, characteristics and
manufacturers of underwater light sources
on present submersibles would be all but
impossible to list because they can and do
change rapidly. In some instances the lights
are “homemade” modifications of automobile
lights. The SEA OTTER operators (Fig. 10.3),
for example, took British ‘‘Rally Lights”
manufactured by CBIE and pressure-com-

System Bandwidth

Output (Audio)

Output (Visual)

Power Requirements

2,500 cycles with slope response com-
pensation for transmission losses

500 to 3,000 cycles

PPI (plot presentation indicator)
display 7-in. CRT with P7 phosphor

115 (+15) volts, 60-cycle +10 percent,
1 amp; 27 (+3) volts, 3 amps

Operating Depth

(Outboard Components) 20,000 feet
Weights

Display Unit 30 Ib

Sonar Unit 32 Ib

Analyzer Unit 40 Ib

Training Mechanism
Transducer Assembly
Test Transducer (Oil

471

45 |b in air, 27 |b in water
47 |b in air, 35 Ib in water
7/8 |b in air, 5/8 Ib in water
Filled)

pensated their housings with air using a
scuba-type regulator. But for the most part
underwater lights are purchased from one or
several of the many companies supplying
this area. (The 1973 Undersea Technology
Handbook Directory, reference (2), lists 60
suppliers of marine lights and beacons in the
U.S., though it does not distinguish which of
these are of the underwater variety.)

It is difficult to discuss underwater light-
ing without first discussing light transmis-
sion in the sea. Space, however, limits the
discussion herein merely to a brief introduc-
tion. Virtually any introductory book on
oceanography or undersea photography will
provide the reader with an adequate back-
ground. For a complete and technically thor-
ough treatment of the principles involved,
the work of Tyler and Preisendorfer (3) is
recommended.

RECEIVER —=
(HYDROPHONE), -

Le Be
*
» TRAINABLE

Giiiedes 4 TRANSMITTER
eS me €
: 260s es

x
al ed
x

an

ees
OUTBOARD
| COMPONENTS ©

~

2 @ RANGE

SELECTORS

Fig. 10.2 STRAZA Model SM502A CTFM sonar components aboard ALUMINAUT. (U.S. Navy)

Compared to passage in air, light passing
through water is rapidly attenuated. This is
the result of: Absorption and scattering due
to the water itself, materials dissolved in the
water and plankton and detritus living and
suspended within the water. The absorption
of light varies with the wavelength.* Scat-
tering is practically independent of wave-
length since the particle size is usually much
larger than wavelengths in the visible light
spectrum. Larson and Rixton (4) constructed
a typical curve of percent transmission
through 20 feet of clear ocean water versus
the wavelength. Their graph is reprinted in

472

Figure 10.4 and shows the maximum wave-
length transmission (78%) as being at about
5,000 Angstroms—the green band. This par-
ticular characteristic (absorption as a func-
tion of wavelength) is a major factor govern-
ing the choice of the most effective underwa-
ter lights for viewing.

While there are many varieties of lights for
submersibles, three types are in general use:

Quartz Iodine—an incandescent light
source using a tungsten filament. The “‘io-
dine cycle” precludes deposition of evapo-
rated tungsten on the inside of the bulb and
subsequent blackening.

DIRECTIONAL Sis
ANTENNA Po

rs é]
—~== 70MM en
E===, CAMERA

4
re aa

STROBE. /
LIGHT

Fig. 10.3. Viewing lights, camera and strobe light, and homing antennae clustered on the brow of SEA OTTER. (Arctic Marine)

Mercury Vapor—A gas discharge light that the visible portion of the spectrum and con-
produces light by passing a current through centrate most of their energy in the red area.
mercury vapor under pressure. The mercury principal line is at approxi-

Thallium Iodide—Similar to the mercury mately 4,400 Angstroms (blue); the thallium
vapor light, but with the addition of thallium line is at approximately 5,350 Angstroms
to the mercury in the arc tube to increase (green). Referring again to Figure 10.4, it is
lumen efficiency and produce a different seen that the gas discharge lights produce a
spectral output. color spectrum least attenuated by absorp-

Incandescent lights radiate throughout tion.

473

PERCENT TRANSMISSION AT 20 FT

80

70

60

50

40

30

20

10

0
4,000 4,400 4,800 5,200 5,600 6,000 6,400

VIOLET BLUE GREEN YELLOW ORANGE RED

WAVELENGTH (ANGSTROMS)

SEAWATER, K = 0.04 AT 5,000 A

Fig. 10.4 Light transmission as a function of wavelength through 20 feet of clear sea-
water. The constant k is the coefficient of absorption for seawater. [From Ref. (4)]

474

Trying to assess or judge which of these
lights is better than the other is difficult,
because, like submersibles themselves, each
one has assets that make it desirable for
certain tasks and undesirable for others.
Consequently, the most legitimate and real-
istic approach is to present characteristics of
each and let the user decide which serves his
purpose best.

C. L. Strickland and R. L. Hittleman of
Dillingham Corp. (5) presented the results of
their tests which compared the above three
lights in respect to light output, sensitivity
to input power variations, attenuation ver-
sus distance, compatibility to television and
color rendition. The test results clearly de-
fine the advantages and disadvantages of
each type and simplify the selection of light
types for particular tasks.

For these tests each light or lamp was in
an identical housing, envelope and reflector
configuration and operated at 250 watts (ex-
cept for the color rendition tests when both
250 and 1,000 watts were used). The results
are highlighted below.

Light output —(lumen efficiency)

quartz iodide 18 lumens per watt
mercury vapor 40 lumens per watt
thallium iodide 75 lumens per watt

At 120 volts the measured output showed
the thallium iodide to be twice that of mer-
cury vapor and six times that of the quartz
iodide. Varying the input voltage showed the
mercury vapor and thallium lights to drop to
85 percent of the 120-volt output; quartz
iodide has an output of less than 45 percent
of its output at 120 volts.

Attenuation —The centerbeam candlepower
(cp) of each light was measured in clear
seawater at distances of 1, 2, 3 and 3.5 me-
ters from the source. The data at 2 meters
are as follows:

Attenuation of

Output (cp) cpat2m_ initial output
(2m)
quartz iodide 1,100 110 90%
mercury vapor (not given) (not given) 80%
thallium _ io- 5,500 1,500 712%
dide

Contrast Level Versus Distance —An experiment
was conducted using gray scale targets at 2,
4,6 and 8 meters from a television camera to
examine where the various lights fell in rela-

475

tionship to the peak of the video response
curve. The thallium iodide provided much
better contrast than the other two, espe-
cially at 4, 6 and 8 meters. Only a slight
difference was measured between the mer-
cury vapor and quartz iodide lamps. This
was explained on the basis of a camera fea-
ture which automatically compensates for
the lower light output of the quartz iodide. It
was theorized that if the targets were far-
ther apart or the water more turbid, the gas
discharge lamps would have more clearly
demonstrated their superior penetration. In
this respect Figure 10.5 compares both the
spectral sensitivity of both the human eye
and a typical black and white TV camera.
The curves for both eye and camera peak at
about 5,500 Angstroms which is almost iden-
tical to that of thallium iodide’s principal line
spectrum (5,350 A).

Color Rendition —At 250 watts for each lamp
the following results were obtained by com-
paring photographs of a spectral color chart
at the varying distances:

lmeter: quartz iodide showed strong
green and blue attenuation and
the violet appeared almost red.
mercury vapor showed poor
color rendition except in the
blue-green region.
thallium iodide showed some
red output, blue and violet;
green is predominant.
quartz iodide (1,000 watts) pro-
vided good color rendition at this
distance, 2.5 meters seemed to
be the limit for the 1,000-watt
light.
mercury vapor showed greens
and blues, otherwise the light
had very little color rendition.
thallium iodide showed yellow
and green, other colors were
non-
existent.

Strickland and Hittleman conclude that
each light has its distinct advantages for
certain applications, but predict that thal-
lium iodide should become the primary un-
derwater light source in the near future.

Subsequent to the above study, A. L. Waltz
(6) of the Naval Undersea Research and De-
velopment Center conducted an investiga-

2 meters:

RELATIVE RESPONSE

100

90

80

70

60

50

40

30

20

0
4,000 4,400 4,800 5,200 5,600 6,000 6,400 6,800

WAVELENGTH (ANGSTROMS)

Fig. 10.5 A comparison of the spectral sensitivity of the human eye (curve a) and a
typical black and white television tube (curve b). [From Ref. (5)]

476

tion into ways of improving reliability and
efficiency of underwater lights. Table 10.3
was taken from Waltz’s report and it summa-
rizes the characteristics and pro’s and con’s
of the commercial light types discussed
above as well as others.

On the whole, the NURDC study confirmed
the results of Strickland and Hittleman, add-
ing that there was a lack of demonstrated
reliability in all existing light systems. Light
failures occurred both during operations and
during design assurance testing. The pri-
mary type of failure during operation was
stated to be leakage of water into the glass
envelope housing which usually caused a
short circuit in the power supply lines.

Analyzing the mercury vapor light failures
on the DSRV, Waltz noted that leakage was
not the problem, but, instead, the fluctuating
power supply from the DSRV’s main batter-

les was a chief culprit. The mercury lights
are designed for AC operation, hence, the
power must be converted from DC to AC and
then current limited, this is accomplished
within a ballast unit. The ballast units did
not regulate the varying voltage input (90 to
140 VDC) adequately and resulted in the
light being driven at a greater power level
than its nominal rating at high inputs (which
reduced its lifetime) or driven at a lower
than rated voltage which decreased its lumi-
nous efficiency. The prime DSRV ballast unit
deficiency was in the electrical power conver-
sion efficiency which was as low as 55 per-
cent. This manifested itself in the form of
heat which caused failure of several units.
Filling the ballast units with a dielectric oil
to improve cooling efficiency and replacing
some electric components solved the problem
somewhat.

Another serious deficiency with the mer-

TABLE 10.3 SUMMARY OF LIGHT SOURCE CHARACTERISTICS [FROM REF. (6)]

Power Source

Light Type Optical Characteristic

Mercury vapor arc Lines in violet, blue, green,
and yellow, deficient else-

where.

Requirements

Current limited supply,
regulated power input

Advantages Deficiencies

Relatively high
efficiency (= 45-50
lumens/watt)

Relatively long start time
(= 6 minutes) and restart
time (= 10 minutes). Poor
color rendition

Thallium iodide-
doped mercury vapor
arc

Dysprosium iodide
thallium iodide-
doped mercury vapor
arc

Incandescent tungsten
filament

Xenon arc

Green line of thallium
dominates the visible out-
put, mercury lines are
suppressed somewhat

Many lines and back-
ground level radiation
spread thruout the visible,
with the green thallium
line being the dominant
line

Continuous output through-

out the visible spectrum,
increasing from the blue
to the red end of the
spectrum

Continuous output through-

out the visible spectrum

Current limited sup-
ply, regulated power
input

Current limited sup-
ply regulated power
input

Regulated power
input

Current limited sup-
ply, regulated power
input

477

Very high efficiency
source of green light
(= 85-90 lumens/watt)

High efficiency source
of visible light (= 80
lumens/watt) with
relatively good color
rendition

Fast start time (<1
second) and good color
rendition

Fast start time (80%
output instantaneously)
and immediate restart,
excellent color rendition

Relatively long start time
(=5 minutes) and restart
time (= 10 minutes)

Relatively long start time
(=4 minutes) and restart
time (= 10 minutes)

Relatively low efficiency
(= 24 lumens/watt)

Relatively low efficiency
(= 22 lumens/watt), requires
a high voltage pulse to start

cury vapor lamps was the relatively long
warmup time required to obtain peak output.
With tungsten lamps warmup time is about
0.5 second; with mercury vapor the time
could be as long as 13 minutes in cold water.
The report concluded with a preliminary de-
sign for lights and ballast units which, in
Waltz’s opinion, would correct the deficien-

Fig. 10.6 Various underwater lights on submersibles: a. Birns & Sawyer, b. Hydro
Products, c. EG&G International, and d. Ikelites pressure compensated by air

cies as he saw them. It should be noted that
this study was performed in 1970. By now it
is safe to assume that several lighting prob-
lems are either solved or much reduced, con-
sidering the greater experience accumulated
and advances in technology over this 5-year
period. Figure 10.6 shows a variety of under-
water lights for use on submersibles.

Another aspect of lighting which bears
heavily on viewing range concerns the lights’
position on the submersible. Mentioned
above were the effects of light scattering by
particulate matter (organic and inorganic) in
the water column. Surprisingly, even the
clearest waters have considerable amounts
of such material which scatters and reflects
light, thus creating viewing conditions quite
similar to those of an automobile’s head-
lights in a fog. (This suspended material is
generally called ‘“‘snow” by submersible oper-
ators, and it is a real-time indicator of
whether the submersible is descending or
ascending.) The majority of submersibles
have their lights attached directly to the

fairing or in the immediate vicinity of the
viewport (Fig. 10.1). To illuminate an object
at some distance from the submersible the
light must travel a two-way path (out and
back) and is subject to scattering in both
directions. The result is to limit both the
range of viewing and the intensity of light
returning to the observer. Another problem
is created with this arrangement when pho-
tographing through the viewport, because
generally, but not always, the lights are
aimed to concentrate on one spot forward
and downward in front of the submersible;
this creates a “hot spot’? which overexposes
one portion of the photograph and underex-
poses others (Fig. 10.7).

Fig. 10.7 A photograph of the sea floor taken from ALVIN. Note the overexposed region or “hot spot’ and underexposed regions at the extremities. Subsequent lighting
rearrangements provided more uniform exposure. (U.S. Navy)

To eliminate the “hot spot’? and reduce
scattering many vehicles mount their lights
on a boom (Fig. 10.8) or as far out on the
brow as possible. In this manner the light
has less distance to travel which reduces the
amount of scatterers it must confront and
permits the lamps to be oriented to provide
more uniform lighting over the area of inter-
est.

Television —The television camera has rap-
idly become an invaluable tool in virtually all
areas of ocean exploration and exploitation.
In the early days of deep submergence it
played a minor role. Because it was large, it
took up valuable space in the pressure hull.
It also consumed a significant portion of the
limited power, and interfacing it with other
electronics was complex. In addition to these
problems, relative to the human eye it lacked
range, color and depth perception. Subse-
quent technological advancements have
largely eliminated the volume and interfac-

Fig. 10.8 Crewman of ALUMINAUT in the process of lowering a light boom
containing four EG&G incandescent lights. (U.S. Navy)

4380

ing problems, and the latest television cam-
eras now provide range of view and details
which may exceed the human eye at the
viewport.

The role of TV is quite varied, several
submersibles mount a camera on the sail and
use it for maneuvering on the surface. In
this application, it is not necessary to open
the hatch to maneuver, which might well be
impossible in certain sea states and, when
the vehicle’s controls are not portable, might
be the only alternative to maneuvering
blindly.

The most general application, however, is
as an adjunct to the viewport wherein it
allows the operator to maneuver while the
observer occupies the viewports. In some
instances it is the only means of viewing
areas around the vehicle and vehicle compo-
nents where there is no direct view availa-
ble. On BEN FRANKLIN a television camera
was mounted on an external pan and tilt
mechanism with two 70 mm cameras and it
served as an aiming device for the cameras.
One of its increasing roles is that of record-
ing bottom features or other objects to pro-
vide a permanent video tape record for de-
tailed post-dive analysis.

A variety of TV cameras, monitors and
recorders is commercially available (e.g., Hy-
dro Products, General Video Corp., Edo West-
ern, Ball Brothers Research, Cohu Electron-
ics, Thomson-CSF) which can operate to any
ocean depth. One commercial camera, the
Hydro Products TC150, is shown in Figure
10.9. It incorporates automatic light compen-
sation, remote focusing from 3 inches to in-
finity and is rated to 10,000 feet deep.

One of the more important technological
developments enhancing the role of under-
water television is the development of a low
light level television camera (LLTV) which
extended the viewing distance and reduced
illumination requirements. Mr. Arthur Vigil
of Hydro Products traced the development of
the LLTV for underwater applications and
compares its performance advantages
against other available television tubes (Vi-
dicon, Image Orthicon, Plumbicon, Silicon
Target Vidicon). Table 10.4 is taken from
Vigil’s paper (8) and compares a low light
level tube (RCA’s Silicon Intensifier Target
(SIT) tube) against a conventional Vidicon

Fig. 10.9 Hydro Products’ Model TC150 underwater television camera. (Hydro
Products)

tube. It is interesting to note the peak of
spectral response of the SIT tube which is at
4,350 Angstroms and somewhat different for
the peak response of a ‘“typical’’ television
tube shown in Figure 10.5.

Vehicle Control
Depth Indicators:

For obvious reasons, every submersible has
a depth measuring device, and quite a few
carry more than one. Virtually all rely
primarily on pressure sensing depth gages,
and a number also use an upward-looking

echo sounder to measure their depth by ping-
ing off the surface. Once again, the variety of
manufacturers of depth measuring and indi-
cating devices is numerous, and in the sub-
mersible field no one brand is preferred over
another. Consequently, an overview of the
principles involved in submersible depth
measuring devices serves better than a list of
trade names. This approach is taken, and a
few examples of systems employed in con-
temporary cehicles are described.

Expandable Metallic Element Gages —The most
common and widely used design principle in
depth measuring devices is found in the
Bourdon tube. The Bourdon tube employs a
curved or twisted metallic tube flattened in
cross section as the sensing element. One
end of the tube is sealed and pressure is
applied to the opposite, open end. At the
onset of applied pressure the tube becomes
more nearly circular in cross section and
tends to straighten. The movement of the
sealed or free end is used to measure the
external pressure. The most common ‘“‘C”’
tube arrangement is shown in Figure 10.10.
Other tube configurations (spiral and helical)
are employed when greater tip motion is
desired. Bourdon tubes can be used for small
pressure measurements (0-10 psig) or large
measurements (0-100,000 psig) with accura-
cies from 0.1 to 2.0 percent of full scale.
These gages are simple, rugged, inexpensive
and are used on many vehicles. The means of

TABLE 10.4 COMPARATIVE DATA ON VIDICON AND SIT CAMERA TUBES [FROM REF. (8)]

7262A Vidicon 4804/P2 SIT Tube

Average “Gamma” of Transfer Characteristic

Lag (% of initial signal current 1/20 second after illumination is removed)

Limiting Resolution (TV lines) at Center of Picture
Dark Current at 0.1 Footcandle
Sensitivity (Ref. Figure 5)
Typical Gain Ratio Adjustment:
Target Voltage (5 to 50 V)
Photocathode Voltage (—2.5 to —9 kV)

Peak of Spectral Response (angstroms)

0.65 1.0

23% 71%

750 700
0.1pA 007A
0.2uA/fc 350uA/fc
100 --

—— 400
5,500 4,350

{

|
PRESSURE

Fig. 10.10 Bourdon tube

transmitting pressure through the hull to
the sensing element varies. In one instance
(BEN FRANKLIN) a soft reservoir external
to the hull was filled with mineral oil which
transmitted pressure changes by thru-hull
hydraulic lines directly to the sensing ele-
ment inside the hull.

Resistance Type Pressure Transducers —These in-
struments are composed of a pressure-sen-
sing element, such as the Bourdon tube, a
device to convert its tip motion to an electri-
cal parameter and a device to indicate or
record pressure changes. A major advantage
to this system is that there is no free or open
end leading directly to the sea, because the
depth indicating signal is passed electrically
through the hull. The most common form of
pressure transducer is a contact coupled to
the sealed end of the Bourdon tube which
slides along a continuous resistor. With a
resistor of constant cross section, the change
in resistance will be proportional to the
movement of the contact.

The pressure transducer shown in Figure
10.11 is a bellows type in which the pressure

482

from the bellows is exerted against a pre-
cisely designed spring which reacts and con-
verts the pressure to a linear motion via the
plate (moving contact) between it and the
bellows. The plate has a contact which wipes
the surface of the resistor and, if a constant
AC or DC potential is held across the resis-
tor, the measured voltage (at the voltmeter)
is a precise measure of the pressure.
DS-4000 uses this principle as one means
of sensing depth, but a Bourdon tube is used
instead of a bellows. The unit (Hydro Prod-
ucts Model 404) is in a pressure-resistant
aluminum housing, the Bourdon tube is oil-
filled, and a rubber diaphragm separates the
pressure transducer from the external envi-
ronment to provide corrosion protection. A
potentiometer is contained in the sensor and
receives excitation voltage from a monitor
unit in the pressure hull. The output is volt-
age proportional to the external sensor. The
monitor (Hydro Products 402) indicates
depth to 1,600 meters at 20-meter increments
and is powered by a mercury battery that is
good for 200 hours. Maximum visual meter
indication error is 2 percent of full scale.
Strain Gage Pressure Transducers —Chapter 5
described the role of strain gages in provid-
ing data to compare calculated against meas-
ured hull strength. The same unit, by virtue
of its change in resistance as a function of
hull distortion from ambient pressure, can
also provide accurate depth measurements.
The U.S. Navy’s SEA CLIFF and TURTLE
employ three independent strain gage
(Wheatstone) bridges bonded to the interior
of the pressure sphere which are selected
individually to supply an electrical depth

PRESSURE

MOVING
CONTACT

RESISTANCE
ELEMENT

ELECTRICAL

P

SPRING

VOLTMETER

Fig. 10.11 Resistive pressure transducer.

signal to an indicator unit. These vehicles
use a pressure transducer as the primary
depth sensor, and the strain gages are used
as both a backup and a check on the pressure
transducer. If a critical difference develops
between the strain gages and the transducer
a “difference” indicator lights to alert the
operator. The pressure transducer is manu-
factured by Electric Boat/General Dynamics
and has a range to 7,500 feet with an accu-
racy of 0.45 percent of full scale. Its readings
are displayed on a nixie tube (numerical
indicating), but can be switched to a dial
indicator if the nixie display fails. The trans-
ducer output is also differentiated to an as-
cent-descent rate amplifier and displayed on
a meter in the depth indicator unit.

Measurement of vehicle depth (or, con-
versely, of height off of the bottom) as a
function of water pressure is accompanied by
a host of variables which work to reduce the
measurement accuracy. Whether deployed in
air or water, there are the inherent inaccur-
acies encountered in the instruments them-
selves, their design and materials of con-
struction. Their use in the ocean environ-
ment introduces dynamic conditions not gen-
erally found ashore in land-based applica-
tions. Hydrostatic pressure at a given depth,
for example, is affected by gravity, water
density (which varies with temperature, sal-
inity and compressibility—the last being a
factor mainly at the greater depths) and
atmospheric pressure variations.

Since atmospheric pressure seldom varies
by more than 1 inch of mercury except under
extreme storm conditions, its effect on depth
readings is not likely to exceed 1 foot. Below
depths of 100 to 200 feet this variation is lost
in instrument error. The effects of waves are
not felt below a depth of about two-thirds of
the significant wavelength—the effective hy-
drostatic pressure being averaged to mean
sea level below that depth. The error caused
by variations in density is random but in
most submersible diving situations is small
in comparison to the gravity variation. Grav-
ity variations produce measurable humps or
depressions in local sea level. These may be
static (permanent), the result of local density
anomalies in the solid-earth structure, or
they may be cyclical, the result of tidal influ-
ences. In the open ocean, however, even

483

these are measured in centimeters, not me-
ters.

Nevertheless, density variations are a con-
sideration, and Woods Hole’s N. P. Fofonoff
has constructed a standard specific volume
profile (the reciprocal of density) which pro-
vides corrections by geographic location at
various depths within the world’s oceans.
Contrary to popular belief, water is com-
pressible—though much less so than most
other liquids. At the tremendous pressures
encountered in the deep ocean, compressibil-
ity (which increases local water density) can
produce a considerable error in depth by any
type of pressure transducer.

In addition to gravity, ocean currents—
whether driven by the wind or Coriolis
foree—can and do produce variations in local
sea level over considerable areas. Although
this does not affect the depth sensor’s meas-
urement of how deep the submersible is be-
neath the local sea surface, unless provision
is made for this anomaly, calculations of how
far the vehicle is above the bottom will be in
error. Again, considering basic instrument
error and all the other factors which affect
depth readings, these differences (particu-
larly at the greater submersible depths) are
not significant—except under the most ex-
acting physical oceanographic requirements,
as in geostrophic flow and dynamic sea-sur-
face topography research, for example.

From a safety standpoint the errors intro-
duced from the above factors do not prohibit
use of pressure/depth gages in submersibles,
because the errors are small in comparison
to the general safety factor of 1.5 built into
pressure-resistant components. An excellent
example of this pressure versus depth differ-
ence is related by J. Piccard in Seven Miles
Down. TRIESTE’s depth at the bottom of the
Challenger Deep was measured at 37,800 feet
on a pressure/depth gage calibrated in fresh
water; subsequent corrections for specific
volume, gravity, compressibility and temper-
ature reduced this to 35,800 feet. An inaccu-
racy of 2,000 feet in depth was, from a safety
standpoint, no real concern because TRI-
ESTE’s pressure hull had a safety factor of
2 which would take it to a computed collapse
depth of 72,000 feet.

The greatest area for concern is evidenced
by the scientist or engineer who wants the

depth of his in situ observations with the
utmost accuracy. To obtain more accurate
pressure/depth measurements vibrating wire
transducers and quartz capacitance pressure
transducers have been constructed in ocean-
ographiec instruments and provide greater
accuracy than the instruments described
heretofore.

In June 1967 the Marine Technology Soci-
ety sponsored the symposium “Precise De-
termination of Pressure/Depth in the
Oceans.” Selected papers presented at this
symposium are contained in reference (9),
which describe the limitations, construction
and testing of specific pressure/depth sen-
sors.

Seemingly incidental but quite important
to a variety of missions, is the method or
device used to present and/or record vehicle
depth during a dive. On many missions the
only importance attached to depth is that of
safety and in this case the operator need
know nothing beyond what the depth is at
any given time. However, in surveying, envi-
ronmental studies and cable inspections
depth is a critical parameter and is the basis
to which all observations are related. In such
cases a record of depth versus time is invalu-
able in reconstruction of the dive and relat-
ing observations to their proper depth cate-
gory. One can always record the time and
depth with each observation, but in the small
confines of submersibles this is not always
convenient and many times the observer
may simply forget to do so. Strip chart re-
corders of the Rustrak variety are available
which are small and trace an imprint on a
paper scroll; these require electric power to
operate. BEN FRANKLIN used a Swiss-built
ink recorder which traced on a depth/time
calibrated paper strip and was powered by a
wind-up-motor, 8-day clock (Haenni S.A.
Model 89RE, Jegenstorf). The recorder was
invaluable in post-dive reconstruction relat-
ing events to time and depth.

Sonic Devices —Depth measurements from
submersibles using sonic devices are ap-
proached in the same manner as a surface
ship measures bottom depth, but instead of
measuring the round trip time interval of an
acoustic impulse from surface to bottom, it
measures the round trip time interval from
vehicle to surface. A number of submers-

DEPTH (THOUSANDS OF METERS)

484

ibles, thus, have upward-looking sonar trans-
ducers for this purpose. The accuracy of such
measurements can be better than many of
the pressure sensors, but this accuracy de-
pends upon the accuracy with which the time
between the outgoing and returning im-
pulses is measured, and the accuracy with
which sound velocity in the overhead water
column is known. The time measurement
accuracy is the instrument error and in con-
temporary echo sounders is considered negli-
gible. The sound velocity error, however, can
be considerable and is the controlling factor
in accuracy. An indication of the errors
brought about by seawater sound velocity
variation can be seen from Figure 10.12 (con-
structed by Mr. J. Berger, U.S. Naval Ocean-
ographic Office), which shows the corrections
versus depth which are required for a stand-
ard sound velocity of 1,500 m/sec (4,920 ft/sec)
off the west coast of Greenland and off Gi-
braltar.

In most instances the sonic devices are
used during ascent for safety purposes to
monitor closure rate with the surface rather
than depth. The reason is quite simple:

GREENLAND a

b OFF GIBRALTAR

50 50

0
DEPTH CORRECTION (METERS)

Fig. 10.12 Depth corrections for echo sounder (1,500 meter/sec).

Power, not only for the recorder or monitor,
but for the transducer as well. Additionally,
sonic devices are more complex than pres-
sure sensors, heavier and larger. Figure
10.13 shows examples of both pressure gage
and sonic depth recording devices on sub-

MAGNESYN
COMPASS

mersibles and also includes other indicators
found in current submersibles.

Altitude —By altitude is meant distance-off-
the-bottom, and this information is used dur-
ing descent so that the operator can reduce
his speed to a safe level upon approaching

PRESSURE
DEPTH GAUGE
EE”

UP/DOWN SONAR
RECORDER

Fig. 10.13 Various indicators and equipments aboard STAR /I/. (Gen. Dyn. Corp.)

the bottom. Information regarding altitude
is also required when a mission calls for
flying or hovering while maintaining con-
stant distance from the bottom. The device
used is invaribly a downward-looking echo
sounder similar in operation, display and
constraints to that described for the depth
indicating echo sounder. Indeed, DS-4000
uses the same transducer for looking up or
down by hydraulically turning it in the de-
sired direction.

For precision control, however, the sonic
devices’ inaccuracies may be unacceptable,
and when the submersible’s transducer is too
close to the bottom the return signal can be
masked by the outgoing signal such that no
altitude values are obtained. In a few cases
where level flight, regardless of distance-to-
bottom, was desired a device called a differ-
ential pressure gage was employed. Bass and
Rosencrantz (10) described such a system

Bee PRESSURE ACCUMULATOR

BYPASS VALVE

they used to fly on a horizontal plane or
isobaric (equal pressure) surface to conduct
photographic missions with ASHERAH. A
diagram of ASHERAH’s so-called isobaric al-
timeter system is presented in Figure 10.14.
The system provides data under the assump-
tion that at 100 feet or more depth (for sea
state 2) pressure fluctuation, due to waves, is
attenuated such that a horizontal plane par-
allel to mean sea level is defined by an
isobaric surface. When the bypass valve is
open, seawater enters the system, rises in
the pressure accumulator, and compresses
the entrapped air such that the pressure is
equal to the ambient sea pressure. The dif-
ferential pressure gage reads zero because
the pressure is the same on both sides. When
the submersible reaches a desired flying
height, the bypass valve is shut. The pres-
sure accumulator now provides a constant
pressure reference for the desired flying

TO SEA

DIFFERENTIAL PRESSURE GAGE

Fig. 10.14 The isobaric altimeter system. [From Ref. (10)]

486

plane, and the differential gage reads the
deviations of the submersible from that
plane. The pressure accumulator was a small
high-pressure air bottle. The differential
pressure gage was manufactured by Whit-
taker Corporation’s Pace Wianco Division, as
was the pressure transducer (model P7)
which operates on a variable reluctance prin-
ciple. A demodulator carrier provided the
proper input and output voltage condition-
ing. The gage system has the following char-
acteristics:

— Input voltage = 22 to 32 VDC
Range = 5 feet (= 2.5 psi)
Output voltage gradient = 1 volt/foot
Linearity = 0.5% best straight line
Output impedance = 2 kilohms
Resolution. Infinite
Volumetric displacement = 3 (104) cu-
bie inch.
A meter readout for this gage was mounted
on the pilot’s control panel to serve as a
navigation aid and to indicate ASHERAH’s
position relative to the horizontal reference
plane.

Speed Indicators:

Because a submersible travels in three
dimensions, both lateral and vertical speeds
are sometimes measured.

Vertical Speed —Rate of descent is an impor-
tant parameter for deep-diving submersibles,
mainly because of the danger of hitting the
bottom too hard. A knowledge of descent rate
allows the operator to adjust ballast or buoy-
ancy to slow down (or speed up). Desire for
knowledge of the vehicle’s ascent rate ap-
pears (from conversations with operators) to
be essentially for academic reasons.

The most basic vertical speed indicator
was described by A. Piccard In Balloon and
Bathyscaphe) for the bathyscaph FNRS-2.
Taking a vane anemometer (identical to that
used by balloonists), Piccard mounted it on
the top and out to the side of the vehicle’s
float. The anemometer is a four-bladed fan
that rotates in proportion to wind (or water)
speed, or the vertical speed of the balloon
and in this case was rotated by the vertical
motion of the bathyscaph. Because it could
not be visually observed, each rotation was
electrically signaled through the hull on a
different code for ascent and descent. Each

487

complete revolution corresponded to a prede-
termined distance, and the frequency of the
revolutions was observed in the hull as a
luminous sparking.

A second method is used by SEA CLIFF
and TURTLE where sequential values from
the pressure transducer are differentiated
and displayed as a rate of change function.

A third and most widely used method sim-
ply times the rate of descent or ascent
through selected depth intervals from the
up/down echo sounder trace. The few vehi-
cles that have a Doppler Sonar, described
later in this section, can also derive rate of
ascent/descent from this device.

By and large, few submersibles measure
vertical velocity and, when they do, descent
rate is the most important parameter.

Lateral Speed Similarly, knowing one’s
speed across the bottom is of little value to
the operator. To the scientist, however, it is a
useful factor in reconstructing area observed
per unit of time. For example, in biological
studies where the number of visible bottom
dwelling (benthic) organisms per area tra-
versed is desired, speed is critical in deter-
mining the distance covered in the absence
of other navigation or locating systems.

There is a wide variety of methods for
measuring a vehicle’s speed, but the two
most generally used are the Savonius Rotor
and the Rodometer.

A Savonius Rotor current meter is shown
in Figure 11.4 (Chap. 11). DS-4000 used a
similar rotor for speed measurements. As the
rotor is turned by water movement, a reed
switch is activated to send electric pulses
through DS-4000’s hull and to produce a
signal on a readout. Each full rotation corre-
lates to a given distance through the water
which is displayed, generally, in knots. Con-
currently, each rotation can be summed to
provide distance traveled; in this fashion the
rotor acts as an odometer. The obvious prob-
lem is: How does one account for speed added
or subtracted by water currents? On surface
ships the same problem is encountered when
measuring wind speed underway, but sur-
face ships generally know with fairly good
accuracy their speed through the water at
various shaft rpm’s. Knowing this, calcula-
tions for apparent wind speed can be made
which ultimately provide true wind speed

and direction. Few submersibles have run
speed trials over measured distances. As a
result, the rotor’s effectiveness as both a
speedometer and odometer is suspect.

SEA CLIFF and TURTLE employ a differ-
ent method to measure speed and distance, a
rodmeter. The rodmeter is the speed sensing
element of the EM (electromagnetic) log. It is
about 12 inches high and 6 inches long, with
an airfoil cross section. The active part of the
rodmeter is an encapsulated coil which is
excited by an indicator transmitter and sets
up a magnetic field in the surrounding
water. Two insulated pickup buttons, one on
either side of the rodmeter, sense the voltage
induced in the water (seawater is an electro-
lyte) moving past the rodmeter and cutting
the magnetic flux set up by the coil. The
voltage sensed by the pickup buttons is pro-
portional to the speed at which the water
moves past the rodmeter and, after process-
ing by the indicator transmitter circuitry, it
drives the speed and distance indicators. Ac-
curacy constraints similar to the rotor at-
tend this method. The Doppler sonar, de-
scribed later in this chapter, is a far more
accurate speed measuring system and is
finding increased application.

Pitch/Roll Indicators:

For a variety of reasons, including both
safety and operational considerations, it is
desirable to know and not exceed certain
pitch or roll (trim) angles in a submersible.
Of all instruments in a submersible, these
indicators are the simplest, most reliable and
consist merely of a bubble in a liquid con-
fined in a curved, degree-marked glass tube.
One such device or inclinometer is shown at
the top of Figure 10.15 (item 43). Generally,
one inclinometer is mounted on the vertical
centerline athwartships plane to provide roll
angle and one exactly amidships in the vehi-
cle’s vertical fore and aft plane to provide
pitch. In the more sophisticated vehicles,
rate of pitch, as well as angle, is measured
and displayed as shown in Figure 10.15.

At this point the detectors, monitors and
recorders found on submersibles become
unique to each vehicle and a matter of per-
sonal philosophy. A similar range of varia-
tions is found in the means used to monitor

488

and detect the status of various vehicle com-
ponents. Table 10.1 lists the most common
status indicators. The reasons for wanting to
know how much compressed air or battery
power is left or if there is a leak in some
critical compartment are obvious and need
no explanation. Other indicators and mea-
surers, as mentioned, either reflect the
builder’s philosophy concerning what’s im-
portant to measure on his vehicle or are
added to increase its capabilities. Hence,
rather than list such personal choices, the
reader is referred to Figure 10.15 which de-
picts what DEEP QUEST’s designers con-
sider to be necessary indicators, detectors
and controls. Except for the DSRV’s, it is
unlikely that any other vehicle exceeds this
in scope. It should be noted that this (Fig.
10.15) is only one segment of DEEP QUEST’s
control station and it has been modified since
this photograph was taken.

Communications

Communication systems in manned sub-
mersibles are used for the following pur-
poses: Sub-to-ship (surface); sub-to-ship (sub-
surface-to-surface); sub-to-diver (subsur-
face); atmospheric chamber-to-lock-out
chamber (intra-vehicle). Systems which per-
form these functions are radio transceivers
(AM and FM), underwater acoustic tele-
phones and hardwire (sound powered) tele-
phones. The following discussion is con-
cerned only with routine operational commu-
nication requirements and systems; the role
of communications to avoid and assist in
emergencies is discussed in Chapter 14.

Surface Communications: (Radio)

From a routine operational point of view,
communications on the surface provide for
pre-dive vehicle checkout and status report-
ing to the surface ship. Post-dive functions
are primarily concerned with rendezvousing
with the support ship for subsequent re-
trieval.

During both the pre- and post-dive periods
the range between support ship and sub-
mersible is maintained at less than 1 mile;
hence, short-range surface communication
systems serve adequately. Most vehicles rely
on line-of-sight, portable radio transceivers
in the ultra-high-frequency or citizen’s band

180 @ ® ee
65. 66 67
@\@ 9

Fig. 10.15 Vehicle status control and indicators on DEEP QUEST. (LMSC)

489

OXYGEN

EMERGENCY HYDRAULICS

HYDRAULIC RESERVOIR

HYDRAULIC PRESSURE

VARIABLE BALLAST

FORWARD BATTERY

AFT BATTERY

28 VDC EMERGENCY AND NORMAL LIGHTING
INTERNAL LIGHTING

NAVIGATION (OUTSIDE) LIGHTS

DEPTH (VEHICLE) IN FEET

DEPTH UP/DOWN 0-600-FT.

DEPTH UP/DOWN 0-60-FT.

GYRO COMPASS REPEATER

LATERAL SPEED COMPONENT (THRU WATER)
DOPPLER SPEED (OVER GROUND)

COURSE SET READOUT (DEGREES)

DISTANCE TO SURFACE (FT.)

COURSE SETTER

SPEED BASED ON PROPELLER RPM.

LATERAL SPEED COMPONENT (THRU-WATER) -
SPEED BASED ON PROPELLER RPM.

DOPPLER SPEED (OVERGROUND)
ASCENT/DESENT RATE INDICATOR (FPS)
MAGNETIC COMPASS REPEATER

PITCH RATE (DEG/SEC)

PITCH ANGLE (DEG)

TRIM SET (DEG)

TURN RATE (DEG/SEC)

STERN PLANE ANGLE

RUDDER ANGLE

DEPTH

AFT LATERAL THRUST (LBS)

TV MONITOR

FORWARD LATERAL THRUST (LBS)
VERTICAL THRUST AFT (RPM)

VERTICAL THRUST FORWARD (RPM)

PORT PROPELLER (RPM)

STARBOARD PROPELLER (RPM)

DOPPLER FREQUENCY RANGE SELECTOR
VOLTAGE INDICATOR (OUTPUT) DOPPLER
DOPPLER FREQUENCY RANGE SELECTORS
ROLL INCLINOMETER

VOLTAGE INDICATOR (OUTPUT) DOPPLER
EMERGENCY RELEASE CIRCUT TEST LIGHT
EMERGENCY POWER FOR EMERGENCY HYDRAULIC SYSTEM READOUT
EMERGENCY HYDRAULIC PRESS READOUT AND POWER SOURCES SELECTION
NORMAL POWER FOR EMERGENCY HYDRAULIC SYSTEM READOUT
NORMAL POWER SUPPLY CIRCUIT BREAKER
EMERGENCY POWER SUPPLY CIRCUIT BREAKER
TRIM MERCURY AFT (DROP SWITCH)

LIST MERCURY STARBOARD (DROP SWITCH)
PORT PAN/TILT MECHANISM (DROP SWITCH)
STARBOARD PAN/TILT JETTISON SWITCH
RAMP JETTISON SWITCH

ANCHOR JETTISON SWITCH

EMERGENCY WEIGHT DROP JETTISON SWITCH

490

58. SIGNAL BUOY RELEASE JETTISON SWITCH

59. MAIN POWER LOSS INDICATOR

60. TRIM MERCURY FORWARD

61. TRIM MERCURY AFT

62. JETTISON SWITCH PORT BATTERY

63. JETTISON SWITCH PORT BATTERY

64. JETTISON SWITCH STARBOARD BATTERY

65. JETTISON SWITCH STARBOARD BATTERY

66. EMERGENCY WEIGHT DROP

67. POWER TO EMERGENCY SWITCHES
CIRCUT BREAKERS

68. EMERGENCY RELEASE PANEL

69. BALLAST CONTROL PANEL

70. UNDERWATER TELEPHONE

71. LIGHTS (INTERNAL)

72. COMMUNICATIONS PANEL AND RADIO

73. EXTERNAL POWER CONTROL PANEL

74. LIFE SUPPORT

category (Table 10.5), which provide commu-
nications up to 50 miles although not more
than 10 or 15 miles are obtained. The exten-
sive use of these frequencies, both at sea and
ashore, has led to a wide variety and quality
of available equipments.

Some of the larger vehicles use much
longer-range surface communications sys-
tems. ALUMINAUT, for example, carried a
75-watt radio transceiver with six channels
and broadcast on 2 to 6.5 MHz. This system

included the Coast Guard emergency fre-
quency of 2182 kHz and frequencies compati-
ble with the nearest commercial marine op-
erator.

Support ship radio requirements in addi-
tion to those connected with submersible
communications can be extensive. In most
open-sea operations (military or civilian)
someone, somewhere must be kept abreast of
the mission’s progress. Additionally, break-
downs, delays and the need for spare parts or

TABLE 10.5 STANDARD RADIO BAND TERMINOLOGY

Frequency Range

From To
ae below 30 kHz
30 kHz 300 kHz
300 kHz 3 MHz
3 MHz 30 MHz
30 MHz 300 MHz
300 MHz 3 GHz

491

Band Name Abbreviation
Very-low-frequency VLF
Low-frequency LF
Medium frequency MF
High-frequency HF
Very-high-frequency VHF
Ultra-high-frequency UHF

additional personnel will inevitably occur.
Since such needs are met from shore-based
activities, the support ship must be capable
of communicating at least to the source of
such support. Quite frequently, it is possible
to operate using only the nearest marine
operator for such shore communications. The
primary difficulty with this arrangement is
that one must frequently wait for a period of
time to make the call. This makes for diffi-
cult schedule keeping if a predesignated time
is set for situation reports. On the other
hand, as long as this inconvenience is appre-
ciated beforehand, the commercial operator
serves adequately.

During a number of open-sea operations
with U.S. Naval agencies, a Single Side Band
(SSB) radio was installed on the support ship
for direct communications with the agency
involved. Using this system is more conveni-
ent than going through a commercial opera-
tor, but the cost can be quite severe, because
both the shore and sea components must be
furnished and installed.

The allocation of radio frequencies for use
at sea is governed by the Federal Communi-
cations Commission for non-government
users and the Interdepartment Radio Advi-
sory Committee for government users. It is
beyond the scope of this discussion to relate
the details of obtaining frequencies and the
attendant legal considerations, but reference
(11) presents a succinct treatise highlighting
the pertinent rules and regulations for U.S.
users.

Sub-Surface Communications:

Communications between the submerged
vehicle and its support ship serve a variety
of purposes. For the most part, however, the
dialogue is concerned with status reports—
more simply, to enable the support ship to
keep abreast of what’s going on in the sub-
mersible. In an emergency the purposes and
needs are quite different, and the considera-
tions involved in selecting a carrier fre-
quency and the nature of the device are
discussed in Chapter 14.

Once the vehicle is submerged the fre-
quency of conversations with the surface is
minimal; purposefully so, because the pilot
and observer(s) have enough work to do
without distractions from above. For this
reason several operators have designed a
code whereby all routine (and emergency)
traffic is transmitted with minimal dialogue.
One such code is presented in Table 10.6 and
was used between DS-4000 and its support
ship. Such codes also conserve power and, in
the event that reception is weak or garbled,
can be more easily understood and inter-
preted.

Probably the simplest code used to ask if
things are going routinely is to click the
transmit button two or three times. Such
clicks are quite distinguishable in the vehi-
cle, and the operator need merely click back
a return OK.

When a submersible has no independent
means of navigation and is required to follow
a certain path, frequently it is tracked from

TABLE 10.6 DS-4000 RADIO/TELEPHONE CODE LIST

Prefix Suffix
DELTA — Dive 1—Ready; Standby
ALPHA — Ascent 2—Commenced; Start
X-RAY — Emergency 3—Trouble; Rescue Me
PAPA — Minor Problem 4—Caution; Stand Clear
NOVEMBER _ Navigation 5—Normal, OK
MIKE — Motor 6—Arrived at
LIMA — Information 7—STOP, Stopped, Completed
CHARLIE — CO9%is 8—Need Assistance — Send Divers
FISH — Depth Reading 9—Conditions Poor, Abnormal
TANGO — Tracking 10-5—I Understand, | Will Obey
WHISKEY — Weather

492

Emergency Signals

XRAY 31—FIRE

XRAY 32—UNCONTROLLED ASCENT

XRAY 33—-UNCONTROLLED DESCENT

XRAY 34—HUNG ON OBJECT ON BOTTOM

XRAY 35—MUST EXIT VEHICLE

XRAY 36—CRANE IS INOPERATIVE

XRAY 37—NECESSARY TO DROP FORWARD
BATTERY

XRAY 38-COLLISION (on surface)

XRAY 39—REQUEST IMMEDIATE PICK-UP

GENERAL CALL — MAY DAY

the surface and its course directed on the
underwater telephone.

By and large, most submersibles employ
sonic (wireless) communications systems re-
lying on the water column, instead of a wire,
to carry the conversation. The carrier fre-
quencies employed in commercially available
devices commonly are 8, 28 or 42 kHz. Sev-
eral factors weigh heavily on the choice of
frequencies: range, ambient noise and com-
patibility with other communication sys-
tems.

Range of an underwater telephone is then
a problem of signal strength versus refrac-
tion, reverberation, scattering and the am-
bient noise at the receiver. Ambient sea
noise has a large low frequency content;
hence, a low frequency communications sys-
tem must compete with this, but, on the
other hand, low frequency sound is less ab-
sorbed on its way to the receiver. The selec-
tion of the carrier frequency or communica-
tions system is a compromise of all the above
factors. Table 14.7 (Chap. 14) presents ranges
of various communicating systems; these are
advertised ranges, and, as the manufactur-
ers agree, they are not always attainable.

The majority of submersibles use a system
operating at 8.0875 kHz for sub-to-surface
communications. This frequency is good for
range in areas of little ambient noise. The
higher frequencies (28, 42 kHz) provide good
short- to medium-range communications and
are usually used in sub-to-diver and diver-to-
diver systems. Because the submersible it-
self is a noise generator, one must consider it
as a negative factor in the selection of a
diver-to-sub wireless communication system.

Chapter 2 briefly discusses sound propaga-
tion in the sea. A wide-ranging and compre-
hensive treatment of underwater acoustics
can be found in reference (12). For purposes
of this discussion, it is sufficient to note that
the velocity of sound in a liquid varies with
temperature, salinity and density. Previ-
ously, it was explained that sound waves
may be bent (refracted) and do not always
follow a straight path. To further complicate
its transmission, a sound can be scattered by
objects in the water and large objects (in-
cluding the bottom and the surface) can pro-
duce echoes (reverberation). The result is to
distort the signal such that intelligible com-

493

munications are difficult. Added to this is
noise produced by animals, the sea surface or
ship traffic which may act to mask or drown
out the communications. Finally, the signal
itself spreads as it travels to a receiver and
this spreading loss also results in signal deg-
radation (with strength dropping as the cube
of the distance). Since all of these factors
vary constantly, communications can be ex-
cellent one day and, for all practical pur-
poses, non-existent the next. In some in-
stances communications can vary within the
tenure of a 5- or 6-hour dive depending upon
the terrain or environment over, within or
under which a vehicle may operate.

The ambient diver confronts all of the
problems found in submersible communica-
tions and quite a few in addition: The diver
must have full freedom of mouth and lip
movements to enunciate words, the face
mask cavity into which he speaks often en-
hances lower frequencies and attenuates
higher frequencies, exhalation of bubbles in-
terferes with communications, and his hear-
ing sensitivity is less in water than in air. If
the diver is wearing a helmet the problems
also involve ambient noise caused by air
injected into the helmet and expired air es-
caping through the exhaust valve. When he-
lium (instead of nitrogen) is used with oxy-
gen a further complication arises in that this
lighter gas medium causes a shift in the
speech frequency and a resultant “Donald
Duck’’ effect, but converters are available
that can reconstruct the diver’s voice so that
it is intelligible (13).

A number of commercial diver communica-
tion systems is available, and tests have
shown their performance as adequate (14).
Where one offers good intelligibility it may
fail in reliability or vice versa. The improve-
ments in this area within the sixties have
been quite remarkable, and it is likely that
the increasing use of divers and lock-out
submersibles in the offshore oil industry will
focus more attention with subsequent solu-
tion of those problems that remain.

Hardwire telephones to the surface have
been used since the advent of the hard-hat
diver, and the number of systems available is
large. All the tethered submersibles use a
hardwire telephone system, and in a few of
the very shallow submersibles (e.g., the NAU-

TILETTE series) a hardwire telephone line is
held at the surface by a buoy, while a small
boat accompanies it and communicates with
the occupants below. The disadvantages of
this method are obvious, including: Reduced
maneuverability, the problems of ‘‘buoy
keeping” in strong surface currents or winds
and the potential for entanglement. The pro-
ponents point out, however, that the buoy-
hardwire arrangement is inexpensive and
also serves as a way to track the submers-
ible.

Sound-powered telephones find application
in lock-out submersibles for communications
between the diver’s and operator’s compart-
ments. On the JOHNSON SEA LINK a sound-
powered phone provides communication be-
tween the acrylic operator/observer’s sphere
and the aluminum diver lockout cylinder.
Basically, the sound-powered telephone may
rely on one device to both transmit and
receive. Sound waves striking a diaphragm
cause it to vibrate. The motion of the dia-
phragm changes the magnetic field of a per-
manent bar magnet adjacent to the dia-
phragm, which induces electric current of
varying voltage and amperage in a winding
connected to an identical device at the other
end. These changes travel to the opposite
end where identical changes occur in its
magnet and cause the diaphragm to repro-
duce the original sound. Because the power
input is small, so is the range of transmis-
sion, but it is quite adequate for the applica-
tion and requires no external source of
power other than one’s voice.

The most fundamental communications
system is frequently used during the pre-
dive surface checkout. This consists of prear-
ranged arm and hand signals on the part of
the diver and submersible operator. There
are standard diver hand signals which the
Navy Diving Manual illustrates, and these
are frequently followed. A few vehicles in-
stall a sound-powered telephone in the free-
flooding sail which the diver uses to accom-
plish the same purpose when on the surface.

NAVIGATION

The term navigation, as used herein, refers
to the submersible system’s ability to an-
swer: Where do we go, where are we and

494

where have we been? It is important to note
that the whole system is involved in supply-
ing such answers, because few, if any, vehi-
cles have the ability to navigate independ-
ently of surface support. The reason is quite
simple: Contemporary submersibles are not
large enough to carry both surface and sub-
surface navigating equipment. The ship-
board navigator might rightfully question
the inordinate volume requirements of a sex-
tant, but, to be quite pragmatic, a sextant or
other visual locating devices simply does not
provide the accuracy or repeatability re-
quired by submersibles in the open sea. To
find and reacquire a cable, pipeline or other
hardware, for example, the submersible’s po-
sition at launch must be known to the best
accuracy possible so that electrical power
will not be consumed merely trying to find
the object of interest. To perform this task,
electronic aids to navigation have taken
precedence over the sextant.

The means of establishing the surface sup-
port platform’s geographic location (for sub-
sequent extrapolation to the submersible’s
undersea position) are many and varied. The
subject has been treated extensively since
man first set out to sea. Hence, surface posi-
tioning per se will not be discussed. For what
is probably the most comprehensive treat-
ment in existence on the methods and means
of surface positioning, reference (15), the
American Practical Navigator or, more com-
monly, Bowditch is recommended. More re-
cent developments, applications and problem
areas in this subject are presented in refer-
ences (16) and (17), the first and second sym-
posiums on Marine Geodesy, respectively.
Before leaving this subject, it must be real-
ized that all present underwater positioning
systems are ultimately referred to the sur-
face position. Thus, any errors introduced on
the surface are carried directly to the sub-
surface. Table 10.7 lists selected contempo-
rary electronic surface positioning systems
and provides an appreciation of the magni-
tude of error encountered with each system.

Determining a submersible’s undersea lo-
cation relative to the surface fix is ap-
proached in two ways: The first involves
tracking of the vehicle by the surface ship
and requires no related action on the part of
the submersible operator; the second ap-

TABLE 10.7 SELECTED SURFACE POSITIONING SYSTEMS [FROM REF. (18)]

Accuracy Signal/
(rms Processing

System Type and Name Manufacturer Range Positions) Users Frequency Type*
CONVENTIONAL RADIO NAVIGATION
Short Range Cubic Corp. 50 km 2-10 m 1 3,000 MHz P-Ph
Cubic Autotape DM-40
Hydrodist MRB-2 Tellurometer 50 km 3-30 m 1 3,000 MHz P-Ph
Medium Range Decca Hi-Fix Decca Systems 300 km 5-50 m Multi 2 MHz CW-Ph
(medium power)
Lorac B Seiscor 500 km 5-100 m Multi 2 MHz CW-Ph
Long Range Loran A Sperry Rand, ITT, 1,200 km 1.5-8 km Multi 2 MHz P-ph

others
Loran C 1,800 km 15-400 m Multi 100 kHz P-Ph
Global Omega ITT, Tracor, 800 km 800-3000 m Multi 10 kHz P-Ph
Nortronics

POSITION FIXING BY SATELLITE
AN/SRN-S receiver + choice ITT Single-fix 60-
of computer 120 m (average
702 receiver + choice Magnavox Global fix interval Multi 150 and Doppler
of computer 90 minutes) 400 MHz
Update Geo Navigator Honeywell

*P: Pulse
Ph: Phase Comparison
CW: Continuous Wave

proach is all on the part of the submersible
operator and, once underwater, is independ-
ent of the surface ship. Between both of
these extremes (surface-dependent versus
independent positioning) are a number of
variations. For convenience, the surface-de-
pendent methods are categorized as Surface
Tracking and the independent methods as
Submerged Navigation. A third aspect of
navigation, intermediate between where do
we go and where have we been, concerns
locating a target and going to it; this func-
tion is termed “Homing,” and is also dis-
cussed.

It is very difficult to speak of navigation

495

without discussing accuracy and within the
confines of this section it is impossible to
discuss adequately the many factors in-
volved in navigational accuracy. Accuracy is
defined as the degree of conformance with a
correct value. But, in regards to an object’s
location on the planet Earth, even the “cor-
rect value,” in terms of its latitude and longi-
tude, is accompanied with inaccuracies un-
der the most exacting measurements. Navi-
gation, according to Bowditch, is not an ex-
act science and a number of the approxima-
tions used by the conventional navigator
would be unacceptable in careful scientific
work. The navigator, however, is a pragma-

tist, and greater accuracy may not be con-
sistent with the requirements or time availa-
ble, or, most importantly, there may be no
alternative. For the submersible operator,
accuracy becomes an overriding considera-
tion when he asks: Where are we, or where is
it? because the answer must always be quali-
fied as: We’re right here, plus or minus sev-
eral hundred yards, feet or several miles.
The inaccuracy in a position may have ex-
treme consequences underwater, because,
for example, precious battery power must be
spent maneuvering to find a particular site
or object. Searching for and acquiring an
object in the deep ocean is an extremely
frustrating experience. In the first place, one
only has the area of the vehicle’s lights in
which to look. Secondly, once the object is
found the vehicle must stop, but stopping
takes some distance and the submersible
usually passes over or by the object. It then
must turn around and relocate it. This may
sound simple, but it isn’t. For example, in
1970 under a contract with the Naval Ocean-
ographiec Office off San Clemente Island,
DEEP QUEST passed over an unusual rock
pedestal at 2,820 feet deep. The operator
immediately bottomed the vehicle and
turned 180 degrees to return to the rock.
Some 2 hours later the search for the pedes-
tal was unsuccessful and terminated due to
the press of time. Numerous examples simi-
lar to this can be found in reports from other
vehicles.

Let us hypothesize that the rock men-
tioned above had been located, and it became
necessary to surface and return to the rock
again. Generally, the procedure would be to
maneuver as close to the rock as possible
and, using whatever means available, obtain
one or more fixes (positions) on the rock’s
location. Returning to the rock now intro-
duces another term describing a navigation
system’s capabilities, ‘‘repeatability.”’ Quite
simply, repeatability is a measure of how
closely the system can bring the vehicle back
to the rock, and in certain types of underwa-
ter work it can be as important as accuracy.
The geologist, for example, may be quite
content to know that the rock we mentioned
is approximately 5 to 6 miles south of San
Clemente; the exact geographic location (ac-
curacy) may be unimportant. What is impor-

496

tant is that he can return to look at or
sample this rock without undertaking a ma-
jor search expedition. Likewise, the surveyor
who has found and mapped a suitable cable
route can accept the fact that the centerline
of the route is plus or minus a half mile from
some point on the earth’s surface; his main
concern is that the centerline of this route
can be reacquired and the cable laid thereon.

Accuracy, therefore, is a measure of how
closely a navigation system can locate the
submersible on the earth’s surface; repeata-
bility is a measure of how closely the system
can get it back to that spot.

Surface Tracking

In a few instances—especially in the early
years—the requirements for a geographic po-
sitioning system were rudimentary at best.
FNRS-2 and 3, TRIESTE I, SP-350 and
ALVIN among others, asked nothing else of
the surface ship but to stand clear when they
surfaced. This was accomplished via the
underwater telephone, whereby the surface
ship, knowing that the vehicle was returning,
kept well clear. As a result, both were quite
far from each other and in 1965 ALVIN re-
quired assistance from a Coast Guard aircraft
to reunite with its support craft (19). But, as
soon as technology made it possible, this
casual approach was replaced. What follows is
not an orderly chronological development of
submersible tracking systems because, quite
simply, there was and is no orderly develop-
ment. Some still use devices which were used
in early fifties, while others use systems of
the seventies. The discussion, therefore, shall
begin with the most basic and proceed to the
more sophisticated tracking systems.

Marker Buoys:

Simple in concept but quite difficult in
practice, one of the first attempts to ascer-
tain the whereabouts of the submerged vehi-
cle was the marker buoy. In this approach a
suitable length of line was attached to the
vehicle with a surface buoy on the other end.
The surface craft merely kept track of the
buoy and took compass bearings on it rela-
tive to itself. By keeping a continuous plot of
its own position, the surface ship needed
merely to draw a post-dive plot of its track
and that of the buoy to reconstruct the vehi-

cle’s underwater course. Mr. John Barringer
quite succinctly outlined a few of the prob-
lems with this approach that PC-3B
(CUBMARINE) encountered off Spain in the
1966 H-bomb search (20).

“An inflatable buoy about three feet
in diameter was attached to the sub-
marine by a length of polypropylene
line. As the sub pulled this buoy
around, range and bearing from the
ship to the buoy could be determined,
and a rough estimate of CUBMA-
RINE’s location made. Various factors
contributed to the inaccuracy of this
system. The length of line from the
submarine to the buoy was roughly
twice the depth of the sub. (Should the
line foul on some underwater projec-
tion, enough line was desired to allow
CUBMARINE to surface without hav-
ing to pull the buoy under. The sub’s
power is not sufficient to pull the buoy
under and hold it there. Also, surface
action of the sea naturally moves the
buoy up and down, and if the line
were taut, CUBMARINE would be
moved up and down with it.) Action of
the wind, sea, and current greatly
affected the position of the buoy. It
was sometimes a very unreliable indi-
cator of the submarine’s course. For
example, when CUBMARINE executed
a 180 degree turn, the buoy would
travel for a time in the opposite direc-
tion the submarine was going, a poten-
tially hazardous situation. Once when
working with the MSO (minesweeper ),
sonar contact with the submarine had
been lost just about the time she had
made a turn. The MSO continued to
steer a course which would normally
have been a safe following one. At this
crucial time communication with
CUBMARINE was also temporarily
disrupted. Suddenly, the buoy stopped
its forward progress, turned, and
headed directly for the ship. The ship
veered sharply, but not in time. The
buoy line fouled in her screw, and
CUBMARINE was unceremoniously
yanked from the bottom. Fortunately,
the line parted long before she could
be reeled up into the screw.”’

497

While the marker buoy may seem to pos-
sess a capricious will of its own, it is used
nonetheless on quite a few vehicles in shal-
low water operations.

Active Sonar Ranging:

Essentially a steel bubble, the submersible
is an excellent reflector of sound. One ap-
proach, therefore, that would seem an excel-
lent candidate tracking system is that of
pinging* off the submersible’s hull from the
surface and calculating a range and bearing
to the submersible. But several factors in-
hibit application of this system. First, when
the submersible operates on or close to the
bottom, the echo from the bottom is as
strong as that from the vehicle itself, and the
return ping from the vehicle usually is indis-
tinguishable from the bottom. Secondly, if a
ridge or other large object comes between
the surface ship and the submersible, con-
tact is lost. These two considerations and the
fact that the best of these systems resides in
the domain of the military have resulted in
very little use of active sonar ranging.

The only reported application of this sys-
tem is, again, by Barringer (20) with CUB-
MARINE in the Spanish bomb hunt.

“The method employed to track

CUBMARINE when she was submerged
was one fabricated of necessity and
was far from adequate for the task. It
was relatively successful for vectoring
CUBMARINE into the area of a posi-
tive sonar contact, but was of little
value in making a geographical plot
of her progress. An MSO, with its UQS-
I sonar, acted as control ship for each
of CUBMARINE’s dives. The ship
would search the bottom with her
sonar, and when a target was located
CUBMARINE would dive. The sonar
operator would acquire the submarine
as she dived, and would give the pilot
courses to steer until the target “blip”
and CUBMARINE’s “‘blip’’ merged on
the sonar screen.

Sometimes this procedure would put
CUBMARINE within a few feet of the
target. More often, however, the target
was not within her range of visibility
(usually 15-20 feet). Then she would

search in an outwardly spiraling pat-

tern. Success with this procedure was
often thwarted by the current. As CUB-
MARINE increased the diameter of
her circling pattern, she was pushed
continually down current, so that the
ground track of the spiral search pat-
tern became corkscrew shaped. The
pilot was unable to correct for this, as
he had no navigation system, and visi-
bility was too poor to allow him to
visually fix a spot on which to circle.
If the spiral search failed to locate the
target, another sonar vectoring at-
tempt was made.

Plotting the track of CUBMARINE’s
progress was an especially frustrating
problem. A continuous plot of the
MSO’s track was maintained using
Decca Hi-Fix and/or range and bear-
ing fixes from landmarks on shore.
CUBMARINE’s position was then plot-
ted relative to the known position of
the MSO. Two procedures were em-
ployed simultaneously in the plotting
of CUBMARINE’s position. The pri-
mary system was for sonar to deter-
mine the relative range and bearing of
the submarine from the MSO. This
method was subject to the inherent
inaccuracies of the sonar, and was
also largely dependent on the profi-
ciency of the sonar operator. Keeping
sonar contact with both the target and
the submarine was often a difficult
task for the sonar man. As he adjusted
the focus of one he could easily lose
contact with the other.”

In the same report Barringer notes that
this system was replaced by the marker
buoy, the adequacy of which has been de-
scribed.

Pinger (Sub)-Hydrophone (Surf):

One of the earlier approaches to tracking
was by the attachment of a pinger to the
submersible and a baffled hydrophone to the
surface ship. As the submersible’s ping was
received by the support ship it would orient
the hydrophone until the loudest ping was
obtained, and from the direction in which the
receiving element was pointing, the relative
bearing of the submersible was obtained.
Slant range, on the other hand, was ob-

498

tained from the submersible’s UQC. In some
instances the hydrophone was lowered di-
rectly from the support ship; in others, it was
lowered from a small boat. The latter ap-
proach introduces a new set of errors, be-
cause now the range and bearing from sup-
port ship to small boat must be obtained
before the relative slant range and bearing
to the submersible can be calculated. Figure
10.16 diagrams the tracking procedures for
STAR III and DS-4000; the origin of the
ship-to-small-boat error is apparent.

Pollio (21) describes this tracking system
as follows: A 20-kHz pinger on the submers-
ible was tracked from the small boat by a
baffled hydrophone oriented to obtain the
loudest ping. The hydrophone angle to the
submersible was estimated, and the heading
of the small boat was obtained from an ‘“au-
tomobile-type’”’ compass. Slant range from
small boat to submersible was found through
the underwater telephone and a stopwatch
with a verbal ‘‘Stand-by-Mark”’ command
from the surface. Range and bearing to the
small boat from the support ship was esti-
mated. Pollio estimates at least a 400-yard
horizontal position error for the submersible
relative to the support ship.

A variety of pinger frequencies can be and
has been used (e.g., 20, 27, 37 kHz), and in the
early dives of ALVIN (and others as well) the
8-kHz underwater telephone was set on CW
transmission. This continuous wave signal was
received by a trainable line-hydrophone for
bearing. A further modification to ALVIN’s
telephone provided transponder range on the
surface ship’s telephone. According to Rainnie
(19) this system gave an estimated position ac-
curacy of the submersible relative to the sup-
port craft of +380 yards (1,140 ft) at 6,000 feet in
depth.

The shallower such systems are used, the
better the accuracy, but for precise survey-
ing they are of little value. Repeatability is
another area that suffers, and the following
account of a current meter array recovery by
ALUMINAUT provides an excellent, if not
classic, example of the inadequacies, frustra-
tions and ingenuity of early tracking sys-
tems, submersibles and crew, respectively.
(Chapter 11 describes the salvage equipment
used in this retrieval and is referred to for
further details.)

ERRORS:
SHIP—TO—SHORE
SHIP—TO—SMALL—BOAT
SMALL—BOAT—TO—SUB

SUB DEPTH \

GEMINI

(eis SaniGal
SS

ae

HORIZONTAL

|
|
7, STAR III

POSITION CONTROL

Fig. 10.16 STAR III's tracking and position control.

The lost array consisted of a 3,600-foot
nylon line with a release mechanism and five
current meters attached in tandem. The
depth was 3,150 feet and the surface location
had been accurately fixed by bearings on
shore when the loss occurred. ALUMINAUT
was equipped with a 37-kHz pinger (which
produced relative bearings to a line hydro-
phone on the surface ship) and an underwa-
ter telephone to provide both range and com-
munications. A CTFM Sonar on ALUMI-

499

NAUT was to be used to “home in” on another
37-kHz pinger which was dropped by the
support ship (PRIVATEER) on the array’s
last fix and suspended off the bottom by a
buoy.

Reaching the bottom at 3,200 feet ALUMI-
NAUT was trimmed, given a course to the
pinger by PRIVATEER and proceeded along
on its wheels. At first, the CTFM sonar inter-
mittently picked up the pinger but then lost
the ability to train (rotate). The pilot was

obliged to turn ALUMINAUT 360 degrees in
an attempt to locate the pinger; this was
unsuccessful and ALUMINAUT then re-
quested PRIVATEER to furnish a course to
the pinger which it would follow with its
gyrocompass. The array was found and it
was followed to the original top current me-
ter. On reaching the top meter, ALUMINAUT
reversed course to follow and ascertain the
array’s configuration and determine whether
or not the release mechanism had func-
tioned. Periodic fixes were obtained on ALU-
MINAUT from the surface so that the array
might be plotted and found again on the
subsequent dive. The array was easily fol-
lowed, and no trouble was experienced until
the line turned at a right angle to its initial
trend. At this point the bottom sloped ab-
ruptly to the left, and the current measured
0.4 knot. To follow the array line it was
necessary to change course to starboard into
the current which was setting on ALUMI-
NAUT’s starboard side. The increased cur-
rent would not allow the pilot to swing 90
degrees to the right and instead caused ALU-
MINAUT to drift to port away from the line.
Visual contact was lost, and ALUMINAUT
was forced to run with the current downslope
until it gained sufficient speed to turn 180 de-
grees in a wide arc back into the current. Visual
contact with the array line was re-established
while stemming the current. Visibility, at 60 to
80 feet initially, had diminished to 30 feet at
this point. Approximately 15 to 20 feet from the
array anchor and release mechanism, the star-
board shot ballast tank malfunctioned and
dropped its shot, causing ALUMINAUT to lose
negative buoyancy and to ascend gradually. To
deter the loss of negative buoyancy the pilot
stopped ALUMINAUT with the vertical thrus-
ter. When ALUMINAUT attempted to get un-
derway again, it could not overcome the cur-
rent, and was carried down-current again while
slowly ascending. At this stage the vertical
motor failed and the pilot was forced to drive
ahead full with the stern propellers while at-
tempting to put a down-angle on the bow with
the diving planes. This was not successful, and
all personnel moved to the bow in an attempt to
increase the down-angle. This failed and
ALUMINAUT finally surfaced without inspect-
ing the release mechanism.

Prior to the second dive a retrieving spool

500

was installed, and to compensate for the
southerly-setting current ALUMINAUT was
towed !/4 mile northeast of the array location
and then commenced to dive statically (with-
out power) with a southerly heading trying
to pick up the 37-kHz marker pinger on the
repaired CTFM.

Bottoming at 3,400 feet, ALUMINAUT
trimmed and continued attempts to locate
the pinger. Although the pinger was nearby
during the descent, after reaching the bot-
tom it was never heard from again. The
subsequent. 3 hours and 51 minutes were
spent looking for the array by following
courses given ALUMINAUT by PRIVATEER.
Subsequent measurements of the positioning
system showed that an error of at least 300
yards existed. A final solution was obtained
by estimating the submersible’s position
through depth measurements and bottom
slope directions communicated to the surface
by the pilot.

ALUMINAUT?’s progress was slowed consid-
erably by the need to negotiate rock outcrops
without use of the broken vertical motor.
Objects on the CTFM and side scanning
sonars also slowed progress for it was neces-
sary to identify each of these objects. At one
point tracks, suspected to be from ALUMI-
NAUT’s previous dive, were discovered and
followed until they finally disappeared.

While ascending up and over an uneven
bottom slope, one of the submersible’s pas-
sengers walked forward and caused a down-
angle on the bow; this in turn caused the
spool to strike the bottom and disengage
from its carrying hook. Retrieving and re-
placing the spool on the hook consumed con-
siderable time because of the decreased visi-
bility caused by sediment stirred up by the
manipulators.

Finally locating the array, ALUMINAUT
attached the retrieval line and surfaced. At
the surface the array was transferred from
ALUMINAUT to PRIVATEER and recovered.
ALUMINAUT’s problems in this retrieval
contain all the elements that act to inhibit
undersea search, survey and salvage. There
is, however, one salient point to bear in
mind: The array was recovered and not be-
cause of the tracking system but in spite of
it.

There is a further aspect of this tracking

method that concerns safety. When the hy-
drophone is deployed from a small boat, it
adds an element of risk, as well as further
inaccuracies. In this context, reference is
made to the DS-2000 incident in Chapter 15
wherein the small boat, support ship and
submersible all became separated with the
onset of inclement weather.

Pinger/Transponder (Sub)—Hydrophone/
Interrogator (Surf):

The system described above requires the
operator to actively participate in determin-
ing the vehicle’s horizontal distance from the
surface ship. First, he must respond with a
“Mark” of his own so that the surface ship
can compute slant range. Second, he must
provide his depth which is also a necessary
factor in slant range computations. A system
designed for BEN FRANKLIN’s 30-day drift
provided all the necessary values with noth-
ing required on the part of the submersible’s
operator. The system, designed by Martin
Fagot of the Naval Oceanographic Office, is
not necessarily the ultimate in surface track-
ing, but it is presented because it worked as
designed for 30 days. Such reliability is rare
in deep submergence.

The tracking system, described by Fagot
and Merrifield (22), is shown in block dia-
gram in Figure 10.17. The submersible’s com-
ponents consist of two independent subsys-
tems: A pinger and a transponder. The sup-
port ship’s components consist of a line hy-
drophone, two transducers, a graphic re-
corder and speaker, an oscilloscope and asso-
ciated electronics.

Pinger Subsystem —The pinger (General Time
Model No. 0B04A) is a self-powered acoustic
generator that emits a 4-kHz pulse at a
precise periodic rate of 1 pulse per 2 seconds.
Every primary pulse, 10 ms in length, is
followed by a secondary pulse, 2 ms in
length. The pulse separation is pressure de-
pendent and varies linearly from 20 to 400
milliseconds for pressures between 0 psi and
5,000 psi. The battery pack, a 12-volt magne-
sium dry cell, provides a signaling life of 2
months for primary and secondary pulse
transmission.

The characteristics of the directional hy-
drophone (Weston - DT-171A) used to receive
the pinger signal are as follows: Frequency
range of 500 to 20,000 Hz; open circuit volt-

501

age sensitivity of 84 db below 1 volt per
microbar; directional beam pattern in the
horizontal plane, approximately 12 degrees
at 3 db down for a 4-kHz signal; and a front
to back sensitivity of 10 db as used in this
operation. When information concerning the
relative bearing to BEN FRANKLIN was not
required, an omnidirectional hydrophone
(Atlantic Research LC-50) was used instead
of the directional transducer.

The output of each hydrophone was iso-
lated, filtered and amplified before being dis-
played on the graphic recorder. The recorder
was a Gifft model GDR-IC-19-T. Since scale
was 200 fathoms for 2-way travel time, the
distance represented by one sweep was 400
fathoms or 2,400 feet across the record. With

AMPLIFIER

4-kHz
RECEIVER

MANUAL
TRIGGER

18-kHz
TRANSMITTER
16-kHz
RECEIVER

SP 75 CT
LA | | istRaza)
L

LC-50

(ATL. RES.)
(WESTON)
4-kHz PINGER
16-kHz TRANSPONDER (GENERAL TIME)
BATTERY
BATTERY

Fig. 10.17 Tracking system block diagram.

Mode Gain set at Xi and Gain set at mid-
scale, total gain from the Gifft was about 40
db. Thus, with a maximum gain of 100 db
from the amplifiers, total gain for receiver
and recorder was 140 db. A speaker was
installed at the hydrophone which allowed
for aural reception of the pinger, and its
strength predicated the direction of training.

Transponder Subsystem —Manufactured by Al-
pine Geophysical Associates, the transpon-
der transmits at 16 kHz and receives at 18
kHz. The interrogating transducer (Straza
SP75 CT) was located on the surface ship and
had a transmitting sensitivity of +48 db at
18 kHz and a receiving sensitivity of —82 db
at 16 kHz.

A transmitter was used in the subsystem
to drive the Straza and was manually trig-
gered at all times when updated slant range
information was required. Although these
transponder signals were not automatically
recorded, they were displayed on an oscillo-
scope. The time delays on the oscilloscope
were converted to slant ranges and manually
noted on the graphic pinger record as re-
quired.

The general tracking procedure was for
the support ship to steam upstream over
BEN FRANKLIN to a slant range of about
5,000 feet. Here, the engines were idled and
the ship drifted back over the submersible to
5,000 feet downcurrent and repeated the cy-
cle. A photograph of the record displayed by
the Gifft recorder is presented in Figure
10.18 and clearly shows the opening and clos-
ing of slant range to the submersible.

Fagot and Merrifield ({bid.) analyzed a va-
riety of factors that influenced this system.
It is interesting that the theoretical range of
this tracking system was 25 miles, but only
about 1 mile was ever realized at sea.

More recently, the Wesmar Scanning
Sonar has been applied in surface tracking.
By using the sonar from a surface ship to
interrogate a transponder on the submers-
ible, ranges and bearings are obtained and
displayed to the surface controllers.

Short Base Line Systems:

Of all the surface tracking systems, the
short base line system, as termed by Rainnie
(19), is the most accurate in determining the
submersible’s position relative to the support

502

craft. With an accurate surface positioning
system, it can provide quite accurate geo-
graphic positioning and high order repeata-
bility. The system was used in the 1966 Span-
ish bomb hunt with USNS MIZAR as the
surface craft and was instrumental in the
mission’s success.

A base line, according to Bowditch, is the
line between two transmitters (or receivers
in this application) operating together to pro-
vide a line of position, or a line serving as the
basis for measurement of other lines. The
length of a base line should be at least one-
fifth that of the average side of the principal
network of lines of the survey or search area
of interest. Accurate measurement of the
base line is critical; the Naval Oceanographic
Office specifies a maximum error of one part
in 150,000 or about half an inch per nautical
mile. Short or long is a relative term, but the
length of the base line with MIZAR is less
than the ship’s length of 266 feet.

MIZAR’s system consists of four hydro-
phones spaced at known locations on the hull
and either a timed-pinger or a transponder
on the submersible. Similar in principle to
the acoustic tracking systems discussed, the
difference resides in the measurement of the
difference in arrival time of the signal at
each hydrophone. From these differences the
depth, range and bearing to the vehicle can
be calculated. A general arrangement of this
system is shown in Figure 10.19.

Rainnie (ibid.) lists several advantages of
this system: There is no action required on
the submersible’s part; several vehicles can
use the same system concurrently; it works
best over the object or area of interest and
looks mainly ‘‘down’’ which helps avoid
shadow zones; and it is potentially one of the
most accurate systems available. On the
other hand, he cites the need for a large ship
(i.e., long base line), stabilized horizontal
reference plane, stringent processing re-
quirements, loss of tracking near the surface
and bulkiness—all of which lead to a complex
and expensive ($0.5 million in 1971) system.

Excluding the Short Base Line System, all
of the foregoing systems provide not much
more than an indication of where the sub-
mersible is in relation to the surface craft.
As we have seen from ALUMINAUT’s experi-
ence, the one slant range and bearing posi-

Fig. 10.18 Gifft recorder record of slant range from support ship PR/VATEER to BEN FRANKLIN. Range increases to right. The larger (thickest) trace is the primary pulse (slant
range); the thinner trace is the secondary pulse which can be read to provide vehicle depth. (NAVOCEANO)

tion is fairly useless either as an accurate or
a repeatable system. Even when the sub-
mersible is bottomed and stationary, multi-
ple fixes on it from different positions pro-
duce position errors in the neighborhood of
200 to 300 yards (23). Since such surface
acoustic tracking systems require an acous-
tic pinger on the submersible, however, they
do provide a necessary safety feature desira-
ble for surfacing and gross positioning in the
event of a submerged emergency.

Submerged Navigation
The title of this section should not be con-
strued so as to infer independence from the

503

surface ship, because all of the following
systems ultimately relate the submersible’s
track or location to positions established by
and on the surface.

The schemes and systems in this category
position the submersible either relative to
undersea objects (both passive and active) or
by dead reckoning. Their commonality re-
sides in the fact that theoretically, they do
not require course changes or directions
from the surface once a reference marker or
a “start” position has been established. The
systems fall basically under Acoustic and
Non-Acoustic approaches but overlapping of
both is so common that such a distinction is

BASE LINE

Sie

we
ae HY DROPHONE
TRANSCEIVER -~———
(W/TRANSPONDERS
ONLY)

/ SX,

Y
C)
a

ae TRANSPONDERS OR PINGER
&

N,

i

Fig. 10.19 Typical short base line acoustic navigation system. [From Ref. (19)]

504

unrealistic. Instead, the following discussion
proceeds from the simplest to the more so-
phisticated.

Visible Markers:

During the THRESHER search TRIESTE
I experienced great difficulty in obtaining
reliable underwater positions to assure that
a particular area had been searched and to
prepare photographic montages. A method
was evolved that consisted of laying individ-
ually numbered and color-coded plastic
markers at intervals along the ocean floor to
serve as visible landmarks (24). The markers
were 17- x 21-inch plastic sheets which were
rolled up and secured by rubber bands with
ends held by magnesium wire. The markers
were tied to 10-pound sash weights and
dropped by a surface craft along designated
tracks at 6-second intervals. Several factors
limited the effectiveness of these “fortune
cookies” (so called because they had to unroll
in order to be read): The tracks and spacing
for dropping could not be held constant,
many “cookies’”’ failed to unroll, and the ef-
fects of variable currents considerably
changed the planned from actual landing
spot. Although some 1,441 markers were
dropped at about every 58 feet on an 11-line
grid, as much as 2 hours might pass between
TRIESTE’s marker sightings. Admittedly an
approach born from the lack of alternatives,
after the THRESHER search the “fortune
cookie” returned to its time-honored role of
providing a chuckle instead of a fix.

Dead Reckoning:

Dead reckoning (DR) is the determination
of position by advancing a known position
from a knowledge of heading, speed, time
and drift. It is reckoning relative to some-
thing stationary or “dead” in the water, and
hence applies to courses and speeds through
the water. Because of inadequate allowances
for compass error, imperfect steering and/or
error in measuring speed, the actual motion
through the water is seldom determined with
complete accuracy. In addition, if the water
itself is in motion, the course and speed over
the bottom differ from that through the
water. Geographically, a dead reckoning po-
sition is an approximate one which is cor-
rected from time to time as the opportunity
is presented.

505

Dead reckoning systems used in submers-
ibles all rely on a magnetic compass or a
gyrocompass for course direction. Distance
has been measured with a wheel, by esti-
mates of speed/unit time and by Doppler
sonar.

Every contemporary submersible lists
either a magnetic compass or a gyrocompass
(or both) in its onboard inventory. The for-
mer, in its simplest form, allows a free swing-
ing and dipping magnet to align itself with
the earth’s magnetic field; the latter depends
upon one or more north-seeking gyroscopes
as the directive element(s) to indicate head-
ing relative to true north. The construction
and workings of the magnetic compass and
the gyrocompass are discussed in Bowditch
(15) in great detail and nothing more can be
added to clarify the subject herein. The use
of either compass to follow a specific course
is inordinately simple: The vehicle is turned
until the appropriate bearing matches a lub-
ber line (a mark on the inside surface of the
compass bowl which indicates forward direc-
tion parallel to the longitudinal centerline)
and proceeds forward on this course. A num-
ber of submersibles have repeaters which
are a part of a remote indicating system that
repeats the indications of the master com-
pass or gyrocompass. Magnesin repeaters
are quite frequently used, and the entire
system (master and slave) is referred to as a
Magnesin compass. These require an AC
power source and generally include a small
DC-AC inverter.

Magnetic Compass —The magnetic compass is
simple, rugged, reliable and requires no elec-
tric power, but it has serious limitations in
submersibles. Since it responds to the net
local magnetic field, a steel hull, a wrench,
iron ballast, bars or shot, magnetic tape re-
corder, external instruments, internal re-
corders, pocket knives, keys or electrical con-
ductors near the compass can influence its
reading. In most submersibles it is difficult,
if not impossible, not to be near the compass.
For this and a host of other reasons, navigat-
ing by magnetic compass is fraught with the
potential for error. Because it is so widely
employed, one would expect that its applica-
tion in submersibles would have been thor-
oughly researched and studied, but, like the
lead-acid battery, reports or articles dealing

with submersible navigation primarily dis-
cuss what could be and not what is: Hence,
the magnetic compass is simply specified and
then ignored. Specific guidelines for the com-
pass are difficult to provide owing to the
diversity of influences in individual vehicles.
One might benefit, nevertheless, by checking
its accuracy once the vehicle is completely
outfitted and ready to dive. Subsequent rear-
rangement of components or outfitting of
new instruments should be followed by fur-
ther rechecking. Furthermore, geographic lo-
cation, magnetic storms and local magnetic
anomalies within the earth call for frequent
rechecking.

A typical local magnetic anomaly might be
an offshore oil rig. John Newman of Perry
Submarine Builders relates that magnetic
compass readings were all but useless in a
North Sea diving operation because the vehi-
cle was operating in close proximity to a
drilling platform. At one point the submers-
ible had inadvertently collided with the plat-
form; wishing to clear the area, the vehicle
turned 180 degrees from its collision course
and proceeded only 10 feet before it collided
with the same rig once again. Obviously,
navigation by some means other than mag-
netic compasses should be considered in un-
dersea pipeline or hardware inspections.

Gyrocompass —Since the gyrocompass is not
affected by a magnetic field, it is subject to
none of the magnetic errors of the magnetic
compass, and it is not useless near the
earth’s magnetic poles. Errors which are
present are the same on all headings. On the
other hand, a gyrocompass requires a suita-
ble source of electrical (AC) power and if
power is interrupted, a period of time (up to 4
hr in some cases) is required for it to stabi-
lize. It is complex and requires more mainte-
nance than a magnetic compass. The gyro-
compass is also subject to several systematic
errors (e.g., precession) which can be elimi-
nated or offset in the design or can be man-
ually adjusted to correct. According to Bow-
ditch, the gyro error of modern compasses is
generally so small that it can be ignored, but
errors can be introduced which make fre-
quent checking a good practice.

Several commercially available gyroscopes
are used in submersibles. Figure 10.20 shows
the Sperry MK 27 and its repeater used

506

280 290 300 310
hvcdrnalssabsyslvudevatassol
H

Fig. 10.20 A Sperry MK27 Gyrocompass aboard DS-2000 located aft beneath the
observers seat. The repeater for this unit (inset) is installed forward on the instrument
panel.

Tie Tree

VAR. GAL, LeveL

4
"Hlitviyiaay
it 5

/
Oo’,
7 e

Fig. 10.20 (inset)

aboard DS-2000. Almost all are adopted
from aircraft designs because of their light
weight and small size. One of the smallest is
R. C. Allen’s Electronic Direction Indicator
used aboard PC-14 and PC-9 (TS-1) and
shown in Figure 10.21. This unit is about the
size of a tennis ball can and may be mounted
directly on an instrument panel. Preliminary
tests, however, showed a drift rate of some 8
to 9 degrees in 2 hours. It is not clear
whether the instrument finally stabilized or
would have continued its precession, or
whether it was being affected by the sub-
mersible’s (PC-9) electronics. Regardless,
once the steady-state drift rate has been
definitely established, it is possible to com-
pensate for it and maneuver accordingly.

A few vehicles use both a magnetic com-
pass and a gyrocompass. Both SEA CLIFF
and TURTLE use a gyrocompass as the pri-
mary direction indicator and a Magnesyn
compass as a backup indicator. To reduce the
influence of the submersible’s magnetic hull,
the master compass (called a “transmitter’’)
is mounted outside the hull in a pressure
compensated container. The repeater (indica-

Fig. 10.21 AnR.C. Allen electronic direction indicator aboard PC-14

507

5 |

pie aaa nee a

Fig. 10.22 To reduce the interfering effects of the hull on its magnetic compass,
SHELF DIVER's compass is mounted aft of the conning tower in the bubble-like
protrusion

tor) is mounted on the operator’s panel and
is shielded to prevent magnetic interference.
Locating the transmitter external to the
pressure hull is not original to the Navy’s
submersibles; Perry’s SHELF DIVER (Fig.
10.22) and others follow the same procedure.

Also adopted from the aircraft industry is
the directional gyro used aboard SDL-1. The
directional gyro is essentially a gyroscope
pointed in a desired direction which it main-
tains for some period of time. Its primary
purpose is to permit the operator to steer a
relatively straight line. The drift rate of
SDL-1’s directional gyro is approximately 1
degree per hour and, hence, it is not intended
for extended dead reckoning.

Generally, a dead reckoning position is ob-
tained by starting at some known point (de-
termined by the surface ship) and carrying
this point along a course, the direction of
which is given by the compass or gyrocom-
pass, the distance derived from speed x time.
The potential for error in this approach has
been discussed. Currents, instrument errors,

operator errors and time errors are the
greatest adversaries. Even if we assume that
all of these errors are zero and that no
currents are present, the speed of most sub-
mersibles is rarely precisely known and this
leads to a larger error which accumulates
with distance traveled. No point is served in
further belaboring the inadequacies of this
approach. In the final analysis it is so full of
unknowns that to consider it as more than a
gross position approximation would be a mis-
take. Two other DR systems, which do not
rely on vehicular speed, are the Unigator
and Doppler Sonar. The former has limited
application; the latter is rapidly becoming a
quite useful tool.

The Unigator —The Unigator (unicycle-navi-
gator) is merely a weighted bicycle wheel
suspended on a rod which the submersible
tows over the bottom (Fig. 10.23). An odome-
ter cable is attached to the wheel and the
odometer display is mounted externally on a
viewport. Used in conjunction with the vehi-
cle’s compass or gyrocompass, the odometer
measures distance traveled along a particu-

Fig. 10.23 The Unigator

508

lar bearing. The Unigator has a major short-
coming: It measures every undulation of the
bottom. Hence, on all but a flat bottom, the
wheel provides a distance in excess of that
actually traveled on a straight path. There
are quite a few flat ocean areas where dis-
tance measurements by the wheel would be
quite accurate. If, for example, a submersible
were inspecting a submarine cable, the
length of cable inspected, as measured by the
wheel, would be as accurate as any method
in existence (providing the bottom was flat
or gently rolling). Additionally, the Unigator
serves a function similar to that of the bathy-
scaph’s guide chain. Once the vehicle is
trimmed to a point where it is being held to
the bottom only by the weight of the wheel,
no further adjustments are required to keep
it at a constant altitude. The designers of
this method relate the details of its construc-
tion and operation in reference (25). Signifi-
cantly, they report a test run along a trian-
gle of 0.1 nm length on each side which
resulted in the submersible (PC-3B) being
offset by only 25 feet from its starting posi-
tion (a buoy). The error was attributed to
currents exceeding 1 knot which swept the
test area and displaced the submersible. As a
geographic positioner, the Unigator offers
far less errors than “fortune cookies” and is
probably better than dead reckoning by
speed-time estimates. Under the proper con-
ditions it is probably as good as any in exist-
ence, and undoubtedly one of the least ex-
pensive to measure bottom distance.

Doppler Sonar —The Doppler principle of
speed measurement is based on the fact that
a signal transmitted from a moving object
and reflected from a stable surface is shifted
in frequency proportional to the speed of the
object in relation to the surface. In Doppler
Navigators, sonic beams from a moving sub-
mersible are directed at the bottom and are
reflected back at a frequency which differs
from the transmitted frequency. The Doppler
unit measures the speed directly by detect-
ing and quantifying this frequency shift. On
surface ships pitch, roll and heave, however,
add another apparent motion with respect to
the bottom. To cancel out this effect, present
Doppler sonar models employ two pairs of
beams instead of one. A pair of beams is
angled fore and aft, and another pair angled

port and starboard. If the ship’s motion is
forward, the frequency shift of the beam
angled forward will be positive and the one
angled aft negative. The difference between
the two return frequencies produces speed
readings which average out the effects of the
pitch of the ship in the water. Each beam is
angled from the vertical and is narrow (ap-
proximately 3° wide).

The receiving unit contains four receiving
hydrophones, also similarly angled and reso-
nant at the same nominal frequency. Speeds
fore-aft and athwartship are measured inde-
pendently to read the true velocity compo-
nents of the ship’s motion, and thus the
ship’s actual speed and drift angle. Integrat-
ing speed over a period of time provides a
reading of distance traveled over the bottom.
Pitch, roll and heave, unless purposefully
done, are usually not a problem submerged,
but drift due to currents—which can equal or
even exceed the submersible’s speed—is an
important factor in maintaining a desired
course. To satisfy the drift problem, the cur-
rent Doppler systems not only sense drift,
but display it in such a fashion that the
operator may compensate for it to follow a
specific track over the bottom.

Doppler sonar has been employed for some
time in the docking and piloting of merchant
ships. It was only in the late sixties that it
became available for deep submersibles. The
U.S. Navy performed tests with a General
Applied Science Laboratory JANUS series
Doppler navigator on board ALUMINAUT in
1968 (26), and as a part of this work Sperry
Rand Corp. performed both laboratory and
field tests on the same Doppler models. The
tests showed promise and prompted Sperry
to produce its model SRD-101 Doppler Navi-
gator, the transducer of which is shown on
JOHNSON SEA LINK in Figure 10.24. A
thorough account of its development, design
and testing is contained in reference (27).

The SRD-101 operates on a frequency of
400 kHz. Because of high acoustic absorption
at this frequency, it is limited to operations
no more than 250 feet off the bottom and not
closer than 4 feet to the bottom. Kritz (ibid.)
points out that a basic accuracy limitation in
heading reference resides in the fact that
virtually all Doppler systems rely on either a
magnetic compass or gyrocompass. To

achieve a 3/2 percent (of heading) accuracy a
heading input from either source accurate to
1/4 degree is required. He further comments
that small gyrocompasses of the type suita-
ble for submersibles do not provide the nec-
essary accuracy. At 1-degree accuracy nei-
ther do magnetic compasses.

In spite of these limitations several vehi-
cles (e.g., TRIESTE, DEEP QUEST, PC-9,
DSRV-1 & 2) employ a Doppler system; one
of these, DEEP QUEST, feeds the Doppler
output into an x-y plotter which provides a
real-time, continuous trace of the vehicle’s
course. No published accounts of the Doppler
sonar’s use under operational conditions are
available, but personal communications with
Mr. Roger Cook, Field Operations Manager
and Chief Pilot of the JOHNSON SEA LINK,
revealed that the SRD-101 has done all the
manufacturer said it would and has shown
100-percent reliability—a rare feat in deep
submergence. Undoubtedly, for dead reckon-
ing the Doppler system is superior to any
others now in use. But, remember: While the
distance of the line traversed is accurate to
within 1 percent of the distance traveled, the
geographic position of the beginning and end
of the line is still extrapolated from the

Fig. 10.24 Doppler sonar transducers (right) aboard JOHNSON SEA LINK. The two
smaller transducers to the left are for the downward-looking echo sounder and are not
a part of the Doppler system.

surface and inextricably bound to the sur-
face positions’ inaccuracies.

Bottom-Mounted Acoustic Systems:

The most discussed and promising schemes
for underwater navigation are systems
which employ bottom-mounted acoustic bea-
cons of precisely known position to provide
near-continuous range and bearing data to
the submersible. From this information an
onboard processor displays and/or records
the vehicle’s relative position in real-time.
The instruments and techniques used in this
approach are varied, but the concept is quite
simple and employs either pingers or trans-
ponders.

Any number of bottom markers may be
used, but three is the preferred minimal
amount because the intersection of three
range vectors from three known positions
provides a triangle of error by which the
accuracy of the fix may be measured. A
strong attraction of this system is that re-
peatability can be theoretically within the
underwater range of viewing by the human
eye (approximately 30 feet) and the operator
can return time and again to the same loca-
tion as long as the marker network remains
functional. Either pingers or transponders
may be used. Rather than use hypothetical
examples of this system, two actual opera-
tions have been documented and serve as
good examples of the variations of this tech-
nique.

Timed-Pingers —In 1967 ALVIN discovered an
F6F aircraft at 5,543 feet; an expedition was
undertaken to relocate the aircraft the fol-
lowing year using timed pingers for on-site
navigation.

ALVIN’s initial position at the aircraft rel-
ative to the surface ship (LULU) was ob-
tained by using a tracking system. LULU
obtained its own position (directly over AL-
VIN) with Loran A to a geographic accuracy
of +1 mile. Hence, a circle of 2 miles in
diameter was established at the search area.
ALVIN also obtained a depth reading at the
wreckage site accurate to within +20 feet.
(The source of this data is reference (28)
which relates in detail the many considera-
tions of the relocation approach, most of
which are not repeated here.)

The operation plan envisioned dropping

510

two timed-pingers upslope of the aircraft on
the 5,250-foot contour and navigate relative
to them.

The heart of the timed-pinger system is a
master clock on the submersible which is
synchronized with acoustic transmitters on
the beacons before deployment and thence-
forth serves as the time standard. The two
beacons transmit a pulse (one at 4 kHz; the
other at 5 kHz) at the same instant and the
arrival times of these pulses are measured
by ALVIN, processed and displayed digitally
and graphically as slant ranges from sub-
mersible-to-pinger. A knowledge of the water
sound velocity is required to obtain the opti-
mum accuracy, as well as an extremely accu-
rate master clock.

The first beacon was dropped by LULU at
positions obtained by Loran A and echo
sounder depths. The second beacon was
dropped at a pre-determined slant range ob-
tained from the first and a surface-obtained
echo sounder depth. The resultant base line
distance between the two pingers was 5,180
feet. ALVIN subsequently dived and obtained
a depth reading on each and, alternately, a
range from one to the other. The submersible
then conducted its search along a depth con-
tour (1,709 decibars), obtaining its position
from the pingers. A reconstruction of AL-
VIN’s track during this operation is pre-
sented in Figure 10.25. Adding to the sys-
tem’s accuracy, a sound velocity meter was
carried by ALVIN to measure the local area
structure.

Comparing the timed-pingers to transpon-
ders (discussed in the following section)
Rainnie (19) lists these advantages of this
system: Any number of vehicles may use it
concurrently; the one way acoustic path de-
creases inaccuracies due to sound speed vari-
ations; electronic “decision making’’ proce-
dures in the pinger are not required; am-
bient noise has no effect and the circuitry is
simple. Rainnie also lists such disadvantages
as higher energy (power) requirements and
degradation of accuracy with time.

Transponders —This system follows the same
format as the foregoing, the important ex-
ception being that the submersible must in-
terrogate (command) the transponder to ob-
tain a range. The primary equipments are an
interrogator (generally a CTFM sonar),

F6F AIRCRAFT INSPECTION
ALVIN TRACK
DIVE 302
24 SEPT. 1968
DEPTH: 1,690 M

0 10

20
SCALE — METERS

Fig. 10.25 ALVIN’s track during F6F aircraft inspection. [From Ref. (28)]

which sends out its command on one fre-
quency; transponders, which receive the in-
terrogation signal and respond back to the
submersible on different frequencies; and a
receiver with the associated inboard equip-
ment necessary to acquire and process the
transponder signals and convert them to
range from the submersible. For greatest
accuracy a sound velocity meter is required

d11

to obtain the local sound structure. In opera-
tion, periodic fixes are obtained as the vehi-
cle proceeds within the transponder net. A
further refinement involves plotting the sub-
mersible’s track on an x-y plotter.

A transponder approach was employed by
TRIESTE II during the search for the SCOR-
PION in 1969. Although the results of this
operation, from a navigational point of view,

were less than anticipated, the approach and
instruments are fairly representative of this
system and are described in reference (29).

TRIESTE II’s interrogator consisted of a
transducer which transmitted a 7-kHz signal
and a receiver capable of receiving 10 replies
at frequencies between 12.5 and 17 kHz. The
interrogator receives, processes and digitally
displays three preselected frequencies as
slant ranges to the bathyscaph. The depth of
this operation was 12,000 feet and an area
500 x 800 feet was to be covered.

The plan envisioned three ships simultane-
ously dropping three transponders buoyed a
short distance off the bottom to form an
equilateral triangle. TRIESTE II was then
to twice cross each line (base line) between
the transponders to establish the distance
between the three as pictured in Figure
10.26. Having established the dimensions of
the net and the relative bearings of one
transponder to the other, the bathyscaph
would then begin a controlled search interro-
gating on 7 kHz and receiving on 14.5, 15.5
and 16.5 kHz. In addition to the input from
the transponder interrogation system (called
TIP), data from a pressure transducer, Dop-
pler sonar and gyrocompass were also fed
into a computer which then allowed the
bathyscaph’s progress to be displayed on an
x-y plotter.

This approach is the optimum for a trans-
ponder system, but as so often happens in
the actual at-sea phase—the results were
quite different than anticipated. First, the
transponders were not dropped simultane-
ously. Next, only two out of the three worked
at first, which required the dropping of a
fourth. The subsequent operations over a 6-
week period consisted of on-again, off-again
transponder reception. In the final analysis,
TRIESTE was forced to use the one working
transponder and gyrocompass headings to
maneuver itself into the prime search area,
and then to navigate by use of SCORPION’s
debris.

TRIESTE II’s experience sums up the ad-
vantages and disadvantages of bottom-
mounted acoustic systems probably better
than any other means: Operationally, the
potential is yet to be realized. This is not to
say that transponders or timed-pingers do
not work. ALVIN’s aircraft search went off

flawlessly, and transponder positioning sys-
tems have worked perfectly in other applica-
tions. But there are exceptions, and far more
often than not system complexity and the
dependence on so many factors result in
partial success. For these reasons contempo-
rary industrial operators of submersibles
have shied away from this approach. An-
other factor is cost; a commercial CTFM
sonar costs some $50,000, a transponder with
its acoustic release mechanism (necessary
for retrieval) is about $5,000. Consequently,
the initial outlay in funds for a three-trans-
ponder system with all the attendant elec-
tronics and processors can run to almost half
the cost of a small, shallow-diving submers-
ible—an example being the P€-14 which cost
Texas A&M University approximately $145
thousand.

Homing

The term “homing” simply means going to
a specific location or an object. All of the
navigation schemes discussed in the preced-
ing sections can be used to home in or direct
the submersible to an object, site or what-
ever. In many instances it is not necessary to
know the geographic location, but merely to
find or reacquire the item of interest. There
are a variety of instruments and approaches

DOT 4

BASE LINE CROSSING 7.
\y poTs

Fig. 10.26 Transponder (DOT) grid and base line crossings as originally planned for
TRIESTE II's SCORPION operations. [From Ref. (29)}

512

to assist the operator in homing. At times
the very simplest means have been used—
e.g., following the marks or trail the sub-
mersible left in the sediment on a previous
dive, following a cable or visually tracking a
trail or pattern of debris, as did TRIESTE II
in the SCORPION operations. On the other
hand, the target itself may produce a scour
mark which may be used for homing—e.g.,
the H-bomb lost off Spain. In this situation,
ALVIN followed a likely looking trail which
led directly to the bomb. Often there are no
alternatives to such homing methods, but
there are other more dependable approaches
which are commercially available and offer
better performance than mere chance or ser-
endipity. These are: Marker buoys and pas-
sive and active sonar targets.

Marker Buoys:

The simplest homing system is an an-
chored buoy line which either the submers-
ible or surface ship plants at the desired
location. The concept is deceptively simple:
The operator needs only to follow the line
down to the anchor. But, limited water visi-
bility, restricted submersible viewing capa-
bility, currents and limited maneuvering
ability all may work individually or together
to thwart this most fundamental approach.
Furthermore, adverse weather can move the
buoy and its anchor or simply tear it loose.
In reality, this method serves mainly as a
visual aid to positioning the surface ship
and, subsequently, the submersible, once it is
in close approximation to the undersea target.

Obviously, there are many methods of
planting a buoy, the time-honored one being
simply to lower an anchored line to the bot-
tom and buoying it off on the surface. The
drawback to this method is that the ship
drifts off the chosen site while the anchor is
being lowered. A more exact and quicker
approach is offered in the Helle ‘Call Buoy”
(Fig. 10.27).

Passive and Active Acoustic Targets:

The most successful homing devices utilize
acoustics either 1) passively, by pinging off a
sound reflecting object and determining its
bearing relative to the submersible (range is
not necessarily important, but may be desir-
able), or 2) actively, by a) receiving and clos-

513

ing in on a ping emitted from the target or b)
interrogating a transponder which marks
the target and homing in on it from the
range and bearing data thus obtained.

The arrangement and deployment of re-
flectors, pingers and transponders vary ac-
cording to the vehicle’s onboard capabilities
and the nature of the task. Deployment of
these devices may be from the surface ship
or from the submersible itself. The devices
may be used individually, or they may be
combined into an array as shown in Figure

Fig. 10.27 The Helle “Call Buoy.” The cylinder on the right is dropped over the side

and sinks to the bottom. For up to 3 years after installation, a coded release signal

from the command module (left) will cause the cylinder to separate and a buoy to rise

to the surface while unreeling a cable. The Call Buoy is presently available with 700 ft
of cable. (Helle Engineering Inc.)

10.28. In this example the array is ship-
deployed and consists of an anchor, a release
mechanism, a sonar reflector, a pinger or a
transponder, a connecting cable and a buoy-
ancy element to hold the array at a desired
level off the bottom. To use this method (Fig.
10.28) as a homing device, the submersible
must have a transmitter/receiver (trans-
ceiver) for the transponder, a receiver for
using only the pinger or a transducer for the
sonar reflector. The information required by
the operator to close with the array can be in
several forms: Range and/or bearing dis-
played as a “blip” on a CRT with which the
operator visually closes; an audible tone
emitted by a speaker and which is loudest
when the vehicle is oriented directly toward
the sound source; or a pair of sonic-activated
lights, one of which blinks to indicate direc-
tion to the sound source. On CTFM sonars
and some others, both audible and visible
displays are provided. The audible display is

“UGH

*
i

OD
ey

V

BUOYANCY
ELEMENT

ringen

sips R

SONAR
REFLECTOR

PULL-PIN
RELEASE

ANCHOR

Fig. 10.28 Elements of a hypothetical homing array. [From Ref. (30)]

514

handy, in that the operator need not take his
eyes from the viewport or TV monitor to
obtain direction. To release the array from
its anchor for subsequent surface retrieval a
submersible would require a manipulator or
some grasping/pulling device to release the
pull-pin in Figure 10.28. A further refine-
ment, quite helpful in visual detection, is a
flashing light which can be detected for some
distance in the absence of natural sunlight
or the submersible’s artificial light sources.

The sources and nature of these compo-
nents are quite numerous and varied. The
trade-offs inherent in the choice of different
operating frequencies are the same as those
encountered in the selection of an underwa-
ter telephone: Low frequency provides
greater range with decreased resolution;
higher frequency provides shorter ranges
with increased resolution.

Illustrative of the devices used in homing
(and navigation as well) are those developed
by the ALVIN Group at Woods Hole during
the late sixties. These are thoroughly de-
scribed in reference (30), and the following
examples are taken from it and reference
(23).

Acoustic Reflectors —A Tri-plane acoustic re-
flector (Fig. 10.29) was developed by WHOI
for ranging and homing out to 600 yards ona
frequency of 72 to 82 kHz. The steel plates
are 1/s-inch thick and the geometric design of
the Tri-plane provides sufficient flat surfaces
to reflect a major portion of the acoustic
pulse. The disadvantages of reflectors are
that line-of-sight conditions must exist and
back-scatter from hilly terrain in the area
may completely mask the reflector’s return.
Field tests with ALVIN in 1966 produced
usable reflections from 1 ft? reflectors of this
type to ranges of 230 yards with the sub-
mersible 10 feet off the bottom. Visual range
to the reflectors (under artificial light) was
from 10 to 20 yards. In some cases reflecting
tape on the Tri-planes produced visual
ranges of 30 to 50 yards.

The Benthos Corp. supplies a hollow glass
sphere capable of withstanding virtually any
ocean depth. Such spheres are better sonic
reflectors than are steel plates, and a bat-
tery-powered flashing light inside the sphere
offers better visual contact than does reflect-
ing tape. Benthos’ spheres and lights were

Fig. 10.29 Tri-plane steel acoustic reflector. (WHOl)

used experimentally (23) and the flashing
light was clearly visible at 310 feet with
ALVIN’s lights off and dimly visible at 175
feet with lights on.

Virtually anything that will reflect sound
sufficiently to produce a return with a favor-
able signal-to-noise ratio will serve as a pas-
sive marker. In a 1969 search for an air-
craft’s flight data recorder package at 350
feet deep, the tail section of the crashed
plane was used as a central navigation
marker for DEEP QUEST’s search of the
area as well as a point on which the vehicle
homed from the surface to commence the
search (31).

Pingers —Acoustic pingers can be dropped
by the submersible or the surface ship. In
the former case, it would serve to mark a
specific point on a survey (or search) line to
which the vehicle would return and continue
the survey, or it might mark the location of
an object to which the vehicle would return
for retrieval. Figure 10.30 shows a solenoid-
actuated pinger release mechanism and a 37-
kHz salt-water activated pinger which will

not begin operating until it is dropped. To
drop the pinger the solenoid is energized;
this draws the plunger into it and causes the
latch arm to move about the pivot. The
movement of the latch arm draws out the
latch pin and releases the pinger. The coiled
spring assists in releasing the pinger. No
electrical power is required to hold the pin-
ger, only to release it.

For quick deployment of a pinger from the
surface, WHOI developed the free-fall bottom

pp >

. Le
ee

LATCH PIN We

Sil

it

cee
B=

Fig. 10.30 A “salt-water” activated pinger and solenoid release mechanism on
ALVIN. (WHOI)

marker (Fig. 10.31). The marker consists of
an anchor, 125 feet of 3/16-inch nylon line, a
syntactic foam float, a 37-kHz pinger and a
stabilizing fin which is attached to the float
and encloses the pinger. The stabilizing fin
also serves as a passive sonar reflector as
well as restricting the free-fall velocity. A
cross-sectional drawing of the marker is
shown in Figure 10.32. As the marker de-
scends, increasing water pressure collapses
the bellows (restrained at one end by a re-
tainer clamp) and the detent plunger re-
tracts and slides free, allowing the retainer
balls to fall into the cavity left by the detent
pinger, thereupon unlocking the ball cage
from the float assembly. Once separated, the

float assembly trails behind the nose cone.
The plunger pin serves as a backup for the
mechanical release of the ball detent separa-
tion assembly. On contact with the bottom
the pin contacts the bellows causing it to
collapse and release the ball detent lock. The
particular pinger in this assembly operates
on 87 kHz and emits a 25-millisecond pulse
every 700 milliseconds for 21 days.

The effective range of such pingers varies
considerably. In a 1966 test (23) ALVIN was
able to acquire the 37-kHz signal at 4,500-
foot range; greater distance might be attain-
able under ideal conditions.

Reception of the pinger’s signal is by a
simple hydrophone-like device or directional

Fig. 10.31 Free-fall bottom marker. (WHOl)

516

PINGER

STABILIZING
FIN

FLOAT

RETAINER
CLAMP

PRESSURE DETENT PLUNGER

ACTUATED
BELLOWS

BALL
CAGE
ASSEMBLY

ANCHOR
LINE

RETAINER
BALLS

ANCHOR

PLUNGER
PIN

Fig. 10.32 Cross section free-fall bottom marker. [From Ref. (30)]

517

antenna attached to the vehicle’s bow which
activates an audible signal when it is point-
ing in the direction of the pinger. A commer-
cially available model of Helle’s Pinger-Re-
ceiver (Model 6550) is attached to DS-2000
in Figure 10.33. The Helle unit is tunable
through 25 to 40 kHz, it is lightweight and
can be either self- or vehicle-powered.
Transponders —Transponders offer more ex-
acting information, but they carry a price
several orders of magnitude higher than
that of a pinger. The cost is sufficiently high
(about $5,000) to warrant their retrieval,
whereas the pinger in the free-fall marker is

considered expendable. Consequently, when
using transponders one must include a re-
lease mechanism (to sever the transponder
from its anchor) and budget some time for
subsequent retrieval. Also, the use of a tran-
sponder requires a transmitter and a re-
ceiver, whereas the pinger needs only a re-
ceiver. For such reasons the use of transpon-
ders as simple homing beacons has been
spotty. The advantages of a transponder are
longer operating life, longer-range reception
and range and bearing to the target instead
of bearing only. In addition to being a hom-
ing beacon, the transponder can also be used

Fig. 10.33 DS-2000 with a Helle Engineering pinger-receiver on its brow for acquiring and homing in on a beacon transmitting at any frequency between 25 and 40 kHz. An
extendable light boom is above the receiver.

as a fairly accurate relative local positioning
reference for search or survey operations.

Underwater release mechanisms are avail-
able which can be operated remotely by
acoustic command or set to release on signal
from an internal clock or by dissolution of a
highly corrodable restraining material (e.g.,
magnesium). A variety of such devices has
been successfully developed for surface oper-
ations. The submersible, however, has the
distinct advantage of being on-the-scene, and
a simple pull-pin release mechanism, such as
shown in Figure 10.34, works quite well.
Withdrawing either one of the two pull rings
will separate the array line from its anchor
and allow the transponder or pinger to float
to the surface. Sole reliance on mechanical
release mechanisms of the pull-pin variety is
not recommended for a number of reasons,
e.g., vehicle breakdown, homing beacon mal-
function and the possible inability of the
submersible to return or even find the array.
The prudent engineer would do well to con-
sider including one of the remote or self-
actuating devices as an additional compo-
nent of the array.

The foregoing discussion has been brief
and simplistic and is quite different from
actual at-sea experience with undersea navi-
gation devices. On an individual basis, each
pertinent navigation component aboard the
submersible and in the homing device may
work perfectly in the laboratory, but, when
they all must work in concert and in the
ocean, the most straight-forward and seem-
ingly foolproof concept can become a night-
mare of frustration. This is especially true
when trying to set up and navigate by a
pattern of bottom-mounted transponders or
pingers. With the passage of time and a
background of thwarted, frustrating efforts,
a normally rational human being will, at
times, find himself thinking of these inani-
mate devices as capricious, mischievous spir-
its. In essence, one does not “simply” do
anything undersea, and just when the hu-
man and non-human components are operat-
ing well, the ocean itself may take the oppor-
tunity to display its ultimate control. Mr.
Robert Worthington, Operations Manager of
the DEEP QUEST system, rather nicely de-
scribed the problem, “The ideal conditions,
although frequently existing in nature, sel-

519

dom seem to occur when most desired.’ The
point is: Anticipate the worst and stand by
with alternatives.

MANIPULATORS

The manipulators on a submersible are the
operator’s hands and arms, and, in the final
analysis, the ultimate manipulator is one
that equals dexterity and control of an ac-
tual human arm and hand. However, this is a
difficult order to fill. H. A. Ballinger (32)
aptly described the difficulty:

‘Consider, for example, the seem-
ingly simple process of quietly closing
a door. The hand proceeds through
three dimensions in space to reach
and grasp the door knob. It must then
describe a true arc, which is parallel
to the plane of the floor and centered
on the door hinges. As the door ap-
proaches closure, the rates of the inte-
grated movement must be selectively
diminished, and a rotary motion ap-
plied to the door knob through a
changing axis angle. At the right mo-
ment when visual, auditory, and force
feed-back confirm, the knob is re-
leased. All these actions require a
constant feed-back and assessment of
data and appropriate motive adjust-
ment—quite out of proportion to the
apparent simplicity of the operation.”’

Woods Hole Oceanographic Inst.

Fig. 10.34 Pull-pin release mechanism. (WHO)

Manipulators represent man’s attempt at
duplicating his ability to grasp, hold, posi-
tion, orient, actuate, push or pull. Conse-
quently, the terminology describing manipu-
lators and the manipulators themselves are
patterned after the human arm and hand.
ALVIN’s manipulator is shown in Figure
10.35 and serves to introduce the terminol-
ogy describing major components and the
movements this particular manipulator can
perform.

In an excellent summary of manipulator
principles and capabilities, P. K. Rockwell
(33) divides the motions of a manipulator into
location and orientation. Location is defined
as positioning the terminal end (claw) at any
spot in the x, y and z axes. Orientation refers
to placing the claw in any attitude requiring
rotation about the x, y and z axes. Hence, six
basic motions, or degrees of freedom, are
required to fulfill these three location and
three orientation capabilities (Fig. 10.36).

Fig. 10.35 ALVIN's manipulator. The arrows describe the movement at various junctures. (NAVOCEANO)

Two more degrees of freedom must be in-
cluded: Grasping and linear movement; the
former is an obvious motion, the latter is not.
If one desires to push an object straight
ahead, the elbow and shoulder must pivot at
the same angular rate if the forearm is to
remain in the same horizontal plane. AL-
VIN’s “joints” and all others as well, can only
function one at a time, hence a linear exten-
sion of the wrist must be provided to push or
pull in the same plane as the forearm. Figure
10.37 graphically illustrates the problem and
its solution.

In Barringer’s door-closing example, the
arm went through a progressively diminish-
ing rate of speed. This is another desirable
feature in a manipulator: Variable speed
control. Most manipulators, however, oper-
ate at only one speed.

A further characteristic of the human arm
is that it tells the “operator” what force to
apply. Such force “feedback” is nonexistent
in contemporary submersible arms, but it is
sometimes quite desirable. As an example, in
1966 ALUMINAUT was operating off the
coast of St. Croix, Virgin Islands. A biologist
on one particular dive was quite anxious to
collect (intact) one of the many sea urchins
inhabiting the bottom. ALUMINAUT’s ma-
nipulator has no force feedback or variable
speed control. Hence, each attempt to pick up
one of the delicate animals resulted in noth-
ing more than a few fragments of spines or
exoskeleton. Much to the biologist’s conster-
nation, the task was finally abandoned.

Obviously there are other components and
requirements that must be present or satis-
fied if the manipulator is to do its work.

a LOCATOR MOTIONS Sn a el

ORIENTOR __-__—_,

———___ moTIONs

Fig. 10.36 Manipulator with six degrees of freedom. [From Ref. (33)]

521

ATTEMPT TO ADVANCE DRILL

SPOT TO BE DRILLED

a. WITHOUT LINEAR EXTENSION

ADVANCE DRILL WITH
LINEAR EXTENSION

SPOT TO BE DRILLED

b. WITH LINEAR EXTENSION

Fig. 10.37 Advancing a drill bit without (a) and with (b) linear extension. [From Ref. (33)]

522

Rockwell (ibid.) provides a chart which in-
cludes these and their relationship to each
other (Fig. 10.38). To limit this discussion, it
is assumed that a man and a work object are
present and that the man can see the object.
Our concern will concentrate on power, the
manipulator, the claw or grasping device and
control. The basis for this discussion is Table
10.8 which presents characteristics of manip-
ulators on a variety of submersibles. This
table is rather sketchy but is accurate inso-
far as manufacturers’ brochures and operat-
ing manuals allow. To the researcher’s dis-
tress, a great number of submersible owners
state the fact that manipulators are present,
but do not list the capabilities in other than
broad terms; hence, the many NA (Not
Available) annotations.

K. B. Wilson (34) states that a “true” ma-
nipulator can locate and orient its terminal
device in any position within its coverage
volume, and devices with less ability should
be classed as special machines rather than
manipulators. If many of the submersibles
which have manipulators were required to
remain fixed in one spot, their “manipula-

CONTROL

INTERFACE

ENVIRONMENT

COMMAND LOOP

FEEDBACK LOOP

tors” would become special machines by Wil-
son’s definition. But the ability of submers-
ibles to do everything but operate upside
down increases the capability of even the
simplest ‘‘machines” to locate and orient the
terminal device both within and without its
area of fixed coverage volume. Consequently,
Wilson’s strict definition is not rigidly ap-
plied.

Power

Electric motors and hydraulic pumps are
the prime suppliers of manipulator move-
ment. If the motors are external to the pres-
sure hull they are subject to the same en-
vironmental constraints as propulsion mo-
tors, and the solutions and trade-offs of AC
versus DC are similar. In the case of SEA
OTTER, a manually operated pump within the
hull pushes hydraulic fluid through the hull to
activate its manipulator. NEKTON’s man-
ipulator obtains all of its motivation directly
from the human occupant who actuates the
arm from within the pressure hull. JIM, on the
other hand, is a human arm within a

MANIPULATOR AND WORK
TERMINAL DEVICE OBJECT

SENSORS

iva

=|
MACHINE

INTERFACE

Fig. 10.38 Functional relationships in a manned submersible manipulator system. [From Ref. (33)]

523

TABLE 10.8 SUBMERSIBLE MANIPULATOR CHARACTERISTICS

Number Degrees Lift Cap.
of of Claw Reach Full Weight Jettisoning
Vehicle Manipulators Freedom Type Power (Max.) Extension In Air Method Manufacturer Remarks
ALUMINAUT 2 6 Parallel Electro- 9 ft lin. 200 Ib NA* None Gen. Elec.
Jaw — Hydraulic
ALVIN 1 6 Parallel Electro- 5 ft 3in. 50 Ib 438 |b Solenoid operated Gen. Mills
Jaw Mechanical trigger pin
Scissor
AQUARIUS 1 6 Scissor Electro- 6 ft 1 in. 150 Ib 150 lb Jettisonable, no HYCO Variable speed control
ARIES Hydraulic details
BEAVER 2 8 Hook Electro 9 ft 50 Ib 150 lb Hydraulic disconnect, North Amer. Variable speed control
Hydraulic (ea) electrical guillotines, Rockwell Various work tool
mechanical disconnect terminations
DEEP QUEST 2 7 Parallel Electro- 5 ft 100 Ib NA Jettisonable Lockheed
Jaw Hydraulic
OS-2000
Os-4000 1 3 Orange Electro- 3 ft Gin. 35 Ib Jettisonable Westinghouse
SP-350 Peel Hydraulic
SP-3000
DOWB 1 6 Scissor Electro- 4 ft 1 in. 50lb 185lb Jettisonable Gen. Mtrs.
Mechanical
DSRV-1&2 1 7 Parallel Electro- 6 ft 8 in. 50 Ib Hydraulically jet- Lockheed
Jaw Hydraulic tisonable by normal or
emergency means
HAKUYO 1 5 Parallel Electro- 4ft 22 |b 220 |b Jettisonable, no detail NA Adjustable grasping
Jaws Hydraulic force
JIM 2 8+ Simu- Manual approxi- NA - None Underwater = Human arm ina jointed,
lated mately Marine Pressure-resistant
fingers 3 ft. Equip., Ltd. enclosure
NEKTON 1 8 Scissor Manual 3 ft 2in. NA NA None General A manually powered and
Oceano- directed rod with claw
graphics pushed pulled or twisted
ina thru-hull penetration
NEREID 1 4+ Parallel Electro- 15 ft 2,500 Ib NA NA Nereid A smaller manipulator
Jaw Hydraulic nv, Holland is used for delicate
tasks and is attached to
the larger one
PC-8 1 3 Parallel Electro- 6 ft 4 in. 300 Ib NA None Perry Sub. If hydraulics fail con-
Jaw Hydraulic Bldrs. trol valves can be
opened to permit sea-
water flooding of arm.
Pressure will open jaws
and retract arm
PISCES Artic- 6 Parallel Electro- 5ft Gin. 150 lb 150 Ib = Manual hydraulic HYCO Can be fitted with a var-
series ulated Jaw Hydraulic pressure iety of hand tools
Arm
& Clamping 3 Circular Electro- NA 2000 Ib NA — Hydraulic, quick HYCO Used for torpedo
SDL-1 Arm Clamp Hydraulic release recovery
SEA CLIFF 2 7 Parallel Electro- 7ft1%in. 100 Ib NA Mechanical Gen. Dyn. Equipped with
& Jaw Hydraulic tools
TURTLE Circular
Clamp
SEA OTTER 1 1 Various Manual 2 ft Gin. NA NA None Arctic Vehicle also has a
Hydraulic Marine “BEAVER TYPE” manipulator

Ltd capable of all its func-
tions. It is not installed

524

TABLE 10.8 SUBMERSIBLE MANIPULATOR CHARACTERISTICS (Cont.)

Number Degrees Lift Cap.
of of Claw Reach Full Weight Jettisoning
Vehicle Manipulators Freedom Type Power (Max.) Extension In Air Method Manufacturer Remarks
SEA RANGER 2 6 Hook Electro- 6 ft 200 Ib NA Jettisonable, no details Verne Engin- One manipulator is used
type Hydraulic eering to hold vehicle in place
2 same same NA 2,600 |b NA Jettisonable, no details same while the other works
vertical
position
SHINKAI 1 6 Parallel Electro- 3 ft 3 in. 33 Ib NA __Jettisonable, no details Kawasaki
Jaws Hydraulic Heavy Ind.
SNOOPER 1 2 Circular Electro- NA 8 lb NA NA Sea Graphics
Clamp Hydraulic Inc.
STAR II 1 4 Scissor Electro- 4 ft 1 in. 150 Ib 150 lb = Mechanical Gen. Dyn.
Hydraulic
STAR III 1 6 Scissor Electro- 4ft 150 |b 400 lb = Mechanical Gen. Dyn.
Hydraulic
TOURS 1 6 Parallel Electro- 6 ft NA NA None Maschinen
Jaws Hydraulic Gabler
GmbH
TRIESTE II 1 6 Parallel Electro- 10 ft 500 Ib NA Jettisonable, no details ACF Electronics
Jaw Hydraulic
VOL-LI 1 ) Parallel Electro- 5ft6in. 150 lb 150 Ib = Manual, hydraulic HYCO
Jaw Hydraulic Pressure
YOMIURI 1 6 Clam _— Electro- 8 ft 1 in. 110 Ib NA None NA
Shell Hydraulic

*NA=Not Available

pressure-resistant suit, and the diver’s arm
provides the movement. Wilson (ibid.) provides
a brief but informative treatment of man-
ipulator power (actuation) in regards to the
advantages and disadvantages of electro-
mechanical versus electro-hydraulic actuators
and Rockwell’s table (Table 10.9) compares
both approaches.

Design and Capabilities

The design and capabilities of manipula-
tors followed no particular course to an ulti-
mate destination. Increased capabilities,
such as more degrees of freedom or greater
lifting and grasping power, were provided
only if they were required to perform a par-
ticular task. The manipulators on the Navy’s
SEA CLIFF and TURTLE are indeed versa-
tile, but for many submersibles they are
unnecessary. For example, DS-4000’s ma-
nipulator and claw may appear somewhat
inadequate compared to the aforementioned,
but for over 400 dives this arm provided all
that was necessary for the scientific re-
search of its users. So the question of such

525

things as how many degrees of freedom, type
of claw and lifting capacity is really an-
swered by balancing the trade-offs. If the
dexterity of the human arm and hand is the
goal, then expense, complexity, weight and
extensive maintenance are some of the sacri-
fices—as well as a long wait, for this goal isa
long way off. In the interim, Figures 10.39
and 10.40 present representative contempo-
rary examples of manipulators; the charac-
teristics of each can be found in Table 10.8. A
brief discussion serves to introduce the capa-
bilities of each and describe the field at large
as well.

SEA OTTER’s manipulator (Fig. 10.39a) is
really what Wilson termed a special machine.
It can only move up or down and relies on
the submersible to train it left or right or
move it forward. The hydraulic cylinder be-
tween it and the skid pushes it up or down by
virtue of a hand pump in the pressure hull.
The device was fabricated for attaching a lift
hook to a sunken tug boat. The lift hook was
held in the terminal end by a dowel. When it
was in place, the dowel was removed by

TABLE 10.9 COMPARISON OF ELECTRIC AND HYDRAULIC MOTION ACTUATION SYSTEMS
[FROM REF. (32)]

Electric Hydraulic

Hydraulic systems are less expensive than electromechanical
systems

@ Electromechanical systems are expensive

@ DC motors start and stop smoothly

© Compatible with the environment
@ High-torque low speed DC motors are heavy and bulky

@ High power to unit weight ratio allows use of small components
@ Small AC and DC motors require high speed operation, which

requires clutches, gear reduction, and brakes to provide @ |nternal leakage of fluid allows drift, overshoot and loss of ef-
adequate motion characteristics ficiency

@ Foreign to the seawater environment so must be oil-filled. @ External leakage degrades efficiency but may not abort the
Seawater intrusion usually results in system failure. operation

®@ Brush insulation must be prevented by increasing contact @ Motions automatically braked by closing of control valve

force, thereby reducing operating life and reliability
@ Simple overload protection provided by relief valves
© Internal wiring easily accomplished eliminating snagging
problems @ External hosing causes snagging problems, internal fluid routing
is complex
@ High and low speed continuous rotation easily obtained
@ Pressure compensation, required for a lightweight system, pre-
vents arm use while changing depth

@ Continuous rotation actuators unreliable

b)

Fig. 10.39 Manipulators of a) SEA OTTER, b) SHELF DIVER, c) DS-4000, d) STAR II, e) NEREID 330 and f) PISCES I//.
(b. Perry Sub. Bldrs., c. NAVOCEANO, d. Gen. Dyn. Corp., e. Nereid nv, f. HYCO)

526

venelo 330 ©

a fm

527

taking in a string which ran from it to a
manually-cranked reel on the pressure hull.
“Jury rigged” though it may have been, the
hook was placed, and the tug boat was sal-
vaged. SEA OTTER, it should be mentioned,
does have a more sophisticated capability in
the form of a manipulator of the BEAVER
type which could have been employed if
needed.

SHELF DIVER’s manipulator (Fig. 10.39b)
is typical of Perry Submarine Builder’s ap-
proach. A hydraulic pump in the pressure
hull provides power for three degrees of free-
dom within its 6.5-foot-diameter working
area. The manipulator is not jettisonable,
but it has a feature whereby the hydraulic
lines can be opened and the ambient pres-
sure (caused by the entry of seawater into
the lines) will open the claw and retract the
arm. The Perry manipulator was designed
for sample retrieval, as was DS-4000’s (Fig.
10.39c). In the latter case, the arm has three
degrees of freedom and also operates on hy-
draulics; it can be jettisoned if necessary.

STAR II (Fig. 10.39d) obtains an additional
degree of freedom by including an elbow in
its arm. Also, its shoulder joint can rotate
more liberally in the horizontal than that of
the two predecessors above.

NEREID 330’s manipulator (Fig. 10.39e) is
by far the most powerful of any submersible,
and its owners refer to it as a “two stage
manipulator system.” The heavy work arm is
a hydraulic crane that lifts 2,500 pounds at a
reach of 15 feet and also serves as the base
for a smaller lightweight ‘intelligent’ arm
behind the strong claw. With the strong claw
attached to the work object the dexterity of
the small arm becomes as good at 2 feet as at
15 feet. The small arm is partly equipped
with manually driven joints to give the oper-
ator a sense of “feel.” To provide a stable
base for the manipulator, the vehicle is capa-
ble of obtaining 5,500 pounds of negative
buoyancy by taking on seawater.

PISCES III (Fig. 10.39f) carries both a
grasping and a ‘‘working” manipulator; the
latter is termed the PHA. The circular grasp-
ing manipulator serves primarily to hold the
vehicle in place while the more dexterous
PHA works. Both manipulators are jettison-

528

able, and the PHA may be operated at var-
ious speeds. All PISCES class submersibles
are capable of this arrangement, and the
aluminum PHA (which can operate to 6,500
ft) is standard equipment on all HYCO-built
vehicles. An upgraded HYCO version of the
manipulator shown in Figure 10.39f is the
manipulator shown in Figure 10.40a. This
has six degrees of freedom and a pressure-
compensation system to permit operation to
any depth. The later HYCO submersibles
(AQUARIUS, ARIES) have this manipulator
in place of the PHA.

The manipulator on DEEP VIEW (Fig.
10.40b) was an experimental model. It is
shown here, not because it represents a radi-
cal departure or improvement in capabilities
or design, but because it is a different ap-
proach to collecting samples with the same
degrees of freedom as the Perry and DS-
4000 manipulators.

ALUMINAUT’s manipulators (Fig. 10.40c)
represented the most advanced technological
achievement of the late sixties. Each arm
has six degrees of freedom. Working together
they provide a high degree of versatility.
When not in use, the manipulators retract
and fold back under the bow.

SEA CLIFF’s and TURTLE’s manipulator
system (Fig. 10.40d) includes an external
stowage arrangement, provision for mount-
ing a television camera and underwater
light, a jettison system, interchangeable
tooling capacity, sample collecting basket
and a remote control system. The manipula-
tors are capable of nine separate motions,
including a tool power takeoff and tool re-
lease, and they may be jettisoned separately,
or both at once. Three tool stowage racks and
one sample basket mounted forward of the
manipulators’ shoulder assemblies provide
for tool interchangeability and sample collec-
tion (these racks and baskets are jettisoned
with the manipulators). An additional sam-
ple basket can be substituted for one tool
rack if desired.

Each manipulator arm consists of four
basic assemblies: shoulder, upper arm, lower
arm, and wrist. These assemblies are cylin-
drical to minimize the possibility of entangle-
ment. They are filled with manipulator hy-
draulic return oil; thus each assembly is
pressure-compensated to slightly above sea

va a
££ a go =

Fig. 10.40 Manipulators of a) AQUARIUS, b) DEEP VIEW, c) ALUMINAUT, d) SEA
CLIFF & TURTLE, e) BEAVER and f) NEKTON. (b. U.S. Navy, c. Reynolds Submarine
Services)

529

e)

pressure by the hydraulic system compensa-
tor. Changes in oil volume due to tempera-
ture variations are also controlled by the
hydraulic system compensator. Additional
over-pressure protection of components is
provided by individual assembly relief
valves. Each of the four assemblies contains
a seawater leak detector.

Any of four interchangeable terminal de-
vices, or tools, may be attached to the wrist.
The tools permit grasping and drilling, as
well as cutting (e.g., cables). When not in use,
the tools are stored in a tool rack near the
manipulator shoulder. Pressure and temper-
ature compensation of the tools is provided
by integral compensators.

Two manipulator replacement counter-
weights are provided for port and starboard
installation when the vehicle is operated
with either or both manipulators removed.
Each counterweight compensates for the
weight of a manipulator to maintain vehicle
buoyancy and trim.

The BEAVER-type manipulator in Figure
10.40e was the first to include variable speed

530

or rate control. It was designed and con-
structed at North American Rockwell for use
aboard BEAVER, which presently has two
such manipulators. With eight degrees of
freedom and variable rate control, the ma-
nipulators are capable of performing a wide
variety of tasks—particularly so since the
terminations (claws) are interchangeable in
situ with an underwater tool array consist-
ing of an impact wrench, cable cutter, stud
gun, centrifugal jet pump, grapple and uni-
versal chuck. These tools are mounted on a
lazy-susan type of device beneath the bow
and in full view of the operator.

NEKTON’s manipulator (Fig. 10.40f) is a
pragmatic detour around systems analysis. It
consists of no more than a thru-hull steel rod
which can be pushed, pulled, twisted and
rotated through and about the penetration,
within a 90-degree included angle and a claw
which can be opened or closed by the opera-
tor who also provides the muscle power. The
arm is a 0.5-inch-diameter stainless steel
tube which encloses a 3/s-inch-diameter solid
rod. Inboard handles, when squeezed, pull

the solid rod into its housing and an arrange-
ment between claw and housing causes the
claw to close. A ball socket at the hull pene-
tration allows rotation through 45 degrees
on either side of the rod. At 1,000 feet deep
the external pressure causes the arm to re-
tract into the hull, but a nylon line and
pulley arrangement allows the operator to
extend the arm. In terms of freedom, it has
at least eight, including force feedback and
variable speed control. To collect samples a
cloth bag is reeled down on a string to an
appropriate position and, with the sample
inside, is reeled back up on the hull. In terms
of thru-hull waterproof integrity, both NEK-
TON BETA and GAMMA have been classed
by ABS; hence, one might properly assume
that this body of expertise found nothing
amiss. There is little else that can be said of
this approach except that at some point it is
depth-limited and that whoever conceived it
should have received an immediate raise in
salary!

Claws

Several types of claws or hands can be
seen in Figures 10.39 and 10.40. TURTLE has
a parallel type of jaw on the starboard ma-
nipulator and a Dorrance type of claw on the
other. BEAVER’s claw is termed a hook type,
PISCES III’s grasping claw is a circular
clamp, DS-4000’s is an orange peel type,
DEEP VIEW’s is aclam shell, and NEKTON’s
is a scissor type. The type of claw depends,
obviously, on the nature of the work. Orange
peel and clam shell varieties are best for
collection of soft sediment samples, the scis-
sors and Dorrance types of claws are good for
holding irregularly-shaped objects, and hook
types hold cylindrical objects well.

Control

Devices which the operator employs to ma-
neuver or control manipulators are either
portable or fixed, and each manipulator mo-
tion has its own button or switch on the
control device. Portable control boxes are
mandatory when the operator is moving
from one viewport to another and physically
cannot reach a fixed control. This is the
situation in ALVIN and an early version of
its manipulator control box is shown in Fig-
ure 10.41. Where panoramic visibility is
available, fixed controls are acceptable. Fig-

531

ure 10.42 shows the fixed manipulator con-
trol panel on PC-14; each knob controls a
specific motion by dispatching hydraulic
fluid to the appropriate hydraulic line.

Owing to the wide variety of tasks one can

envision for manipulators, it would be fruit-
less to make a blanket recommendation ap-
plicable to all vehicles. Experience, nonethe-
less, has provided some excellent general
guidelines to the manipulator designer
which are germane to all. In a 1966 article on
manipulators, Hunley and Houck (35) pre-
sented some lessons learned on TRIESTE I
and II. These lessons warrant due considera-
tion because the tuition was paid in the form
of lost manipulators and lost capability. The
following is extracted from their experi-
ences:

—Emergency jettisoning devices should
not allow inadvertent release of the ma-
nipulator.

—Some means to view the manipulator
when stored (to insure that it is, in fact,
stored) should be provided.

—Extended immersion in seawater calls
for corrosion-resistant materials.

—Television cameras and lights on the
claw or forearm are invaluable aids for
fine positioning or inspection.

—External wire or cabling can be torn
loose during tows.

—Internal leakage in joint actuators may
cause the manipulator to creep from its
last position.

A more recent report by Pesch et al. (36)
discussed the test results of divers versus
manipulators in undersea work. While the
results are fairly predictable (the diver al-
ways won), several of the general conclusions
can be applied to increasing manipulator
performance, and others may serve to alert
the designer to conditions of which he might
not be aware. The following is extracted from
reference (36):

—Quite frequently the manipulator blocks

the work object from the operator’s view.

—Requirements to align a tool perpendicu-

lar to a surface should be reduced be-
cause of optical distortion, empty field
conditions and the simple mechanical dif-
ficulty of alignment.

—The manipulator color should afford

moderate background contrast. A white

‘ee on ;
; 5 35 jf.
“St é a
RE © (oo ®o
. t 70 :
FF

EN

MANIPULATOR

SPEED CONTROL
LOW OFF HIGH

FIELO
ON

GRIP SET
io 7 a5

0 100 0

WRIST ELBOW SHLOR SHLOR
PIVOT PIVOT PIVOT ROTATE

ww ew

GRIP WRIST

Ce

: @& & & & .

cw

&

cw

CLOSE

Fig. 10.41 An early model of ALVIN's portable manipulator controls. (WHOl!)

arm provides too much backscatter and a
dark arm cannot be seen.

—Both manipulator operator and vehicle
operator should have the same view if
submersible movements and manipula-
tor operations are to interact.

—Common machine shop practices, e.g.,
self-alignment, self-tool feed, torque-lim-
iting clutches and step drills for pilot
holes, could be applied profitably to ma-
nipulator tool design.

There are indeed many improvements
which submersible manipulators must pro-
vide if they are to realize anywhere near the
capability of the diver. But the onus is not on
submersible operators alone. The designer of
underwater hardware to be worked on is one
of the major obstacles standing in the way of
submersible performance. Look closely at
Figure 10.43, where the diver is making a

532

midwater electrical connection in seconds
that would take a submersible minutes and
perhaps hours to complete. In addition to the
connector, there are bolts and nuts that also
might need disconnecting, a relatively easy
task for the diver. Why are they easy tasks?
Quite simply because they were designed to
be performed by the human arm and hand
with assistance from human hand-held tools.
Herein lies the crux of the problem: If the
ends of the nuts or the connector had been
designed for grasping by a hook, parallel
jaws or Dorrance-type claw, the task of the
submersible would be eased immensely. No
doubt, equaling the human “manipulator” is
a difficult, if not impossible, task, but the
human can only go so deep in the ocean.
Hardware knows no depth limit, and if the
hardware designers anticipate replacement
of parts or installation of devices subsequent

3. Tyler, J. E. & Preisendorfer, R. W. 1962
Light in the Sea. v. 1, p. 348-397, John
Wiley & Sons, N.Y.

4. Larson, D. A. & Rixton, F. H. 1969 Un-
derwater lighting and new light sources.
Undersea Tech., Sept., p. 38-39; 56-57.

. Strickland, C. L. & Hittleman, R. L. 1968
Underwater light sources. Oceanology
International, Sept./Oct., p. 36-39.

6. Waltz, A. R. 1970 A Study of Light
Sources for Underwater Use. NURDC
Rept. NUCTM 444, 53 pp.

7. Green, P. S., Bellin, J. L. S. & Knollman,
G. C. 1968 Acoustic imaging for viewing
in turbid water. Undersea Tech., May, p.
48-51.

8. Vigil, A. E. (no date) A New Low Light
Level Television Camera for Underwa-
ter Application. Hydro Products, San
Diego, Calif. (Unpub. manuscript).

9. Marine Tech. Soc., 1968 Selected Papers
from Pressure Depth Symposium. Jour.
of Ocean Tech., v. 2, n. 2, p. 27-29.

or

Fig. 10.42 Manipulator contro! panel on PC-14. Each knob controls a separate
manipulator function.

to immersion beyond diver depth, then they
must bear in mind that non-human, not hu-
man, manipulators will be doing the work.
Several orders of magnitude increase in
present manipulator performance could be
realized if designers would keep this fact
constantly in mind.

REFERENCES
ie Volberg, ils W. 1964 CTFM sonar for Fig. 10.43 A diver makes an electrical connection on SEA LAB III. (U.S. Navy)
deep submergence. Undersea Tech., Jan.,
p. 38-41.

2. Undersea Technology Handbook Direc-
tory. 1973 Compass Publications, Arling-
ton, Va.

533

10.

AGIE

12.

13.

14.

15.

16.

18.

UG)

20.

bo
bo

Bass, G. F. & Rosencrantz, D. M. 1968 A
Diversified Program for the Study of
Shallow Water Searching and Mapping
Techniques. Final Rept. for the Office of
Naval Research under contract N00014—
67A—0216-0002, 130 pp., Univ. Museum,
Univ. of Penna.

Karr, B. N. & Gillen, R. G. 1969 Marine
radio communications. in Handbook of
Ocean and Underwater Engineering.
McGraw-Hill Book Co., p. 11-92 to 11-97.
National Defense Research Comm. 1969
Physics of Sound in the Sea. Depart-
ment of the Navy, Headquarter Naval
Material Command, 566 pp., U.S. Govern-
ment Printing Office, Wash., D.C., 20402.
Ocean Industry 1967 Three diver com-
munication systems end “Donald Duck”’
distortion. v. 2, n. 10, p. 28-29.
Lauderdale, C. L. 1978 U.S. Marine
Corps Testing of Swimmer Acoustic
Communications. Naval Coastal Systems
Laboratory, Panama City, Fla., 27 pp., 3
appendices.

Bowditch, N. 1966 American Practical
Navigator. U.S. Naval Oceanographic Of-
fice, H.O. Pub. No. 9, 1524 pp.
Proceedings of First Marine Geodesy
Symposium. Columbus, Ohio, 28-30 Sept.
1966, U.S. Government Printing Office,
Wash., D.C., 301 pp.

. Marine Geodesy, A Practical View. A

second symposium on Marine Geodesy, 3-
5 Nov. 1969, Mar. Tech. Soc., Wash., D.C.,
333 pp.

Raudsep, I. D. 1969 Ship positioning de-
termining systems. Oceanology Intl.,
Mar./Apr., p. 45-49.

Rainnie, W. O. 1971 Equipment and in-
strumentation for the navigation of sub-
mersibles. Underwater Jour., June, p.
120-128.

Barringer, J. L. 1967 CUBMARINE oper-
ations in Spain. Geo-Marine Tech., v. 3,
n. 1, p. 12-18.

. Pollio, J. 1968 Undersea Studies with the

Deep Research Vehicle STAR IIT. Naval
Oceanographic Office, I.R. 68-103, 73 pp.
(Unpub. manuscript).

2. Fagot, M. & Merrifield, R. 1969 Tracking

BEN FRANKLIN During the Gulf
Stream Drift Mission. Proc. of the ION
National Marine Navigation Meeting,

534

23.

24.

25.

26.

27.

28.

29.

30.

31.

32.

33.

34.

2nd Sym. on Manned Deep Submergence
Vehicles, 3-4 Nov. 1969, San Diego, Calif.,
p. 261-275.

Busby, R. F. & Merrifield, R. 1966 Under-
sea Studies with the DSRV, ALVIN, Ton-
gue of the Ocean, Bahamas. Sept. 1966.
Naval Oceanographic Office, I.R. 67-51,
54 pp. (Unpub. manuscript).

Mackenzie, K. V. 1970 Early history of
deep submergence navigation aboard
TRIESTE. Jour. Inst. Navigation, v. 17,
ras dl, IPA yoyo

Busby, R. F. & Hart, W. E. 1966 Seafloor
navigation for deep submergence vehi-
cles. Jour. Inst. Nav., v. 138, n. 2, p. 141-
145.

Navigation Equipment Trials: DSRV
Doppler Sonar Test Results. 1968 DSSP
Office, Pub. No. GB-2510-1001.

Kritz, J. 1970 Doppler sonar navigator
for work submersibles. 2nd Ann. Off-
shore Tech. Conf. Pap. No. OTC 1266, p.
403-414.

Woods Hole Oceanographic Institution
1969 Deep Submergence Research Con-
ducted During the Period I Jan. - 31
Dec. 1968, WHOI Tech. Rept. 69-17.

Dunn, A.T. 1969 The actual navigation
of SCORPION operations, Phase II.
Proc. of the ION National Marine Navi-
gation Meeting, 2nd Sym. on Manned
Deep Submergence Vehicles, 3-4 Nov.,
1969, San Diego, Calif., p. 242-252.

Winget, C. L. 1969 Hand Tools and Me-
chanical Accessories for a Deep Sub-
mersible. WHOI Pub. Ref. 69-82, 180 pp.

Worthington, R. K. R. 1969 Navigation of
deep submersibles in close search. Proc.
of the ION National Marine Navigation
Meeting, 2nd Sym. on Manned Deep Sub-
mergence Vehicles, 3-4 Nov., 1969, San
Diego, Calif., p. 253-259.

Ballinger, H. A. 1967 Telechiric devices
and systems. Tech. and the Sea Bed Pro-
ceedings of a Conf. at the Atomic Energy
Research Establish., Harwell, Eng., 5-7
April 1967, v. 1, p. 238-272.

Rockwell, P. K. 1971 Underwater Manip-
ulative Construction Systems (UMCS).
NCEL Tech. Note N-1158, 86 pp.

Wilson, K. B. 1969 Manipulators. in

35.

Handbook of Ocean and Underwater
Engineering. McGraw-Hill Book Co., p. 4—
11 thru 4-23.

Hunley, W. H. & Houck, W. G. 1966 Un-
derwater manipulators. Naval Engi-
neers Jour., v. 78, n. 6, p. 1003-1009.

535

36. Pesch, A. J., Hill, R. G. & Klepser, W. F.
1971 Performance comparisons of scuba
divers vs. submersible manipulator con-
trollers in undersea work. 3rd Ann. Off-
shore Tech. Conf., 19-21 April 1971, Hous-
ton, Tex., Paper No. OTC1437, p. 221-232.

SCIENTIFIC AND WORK

EQUIPMENT

The most readily available data-gathering
system aboard a submersible is the human
being, and for this reason the diving tasks up
to the early 1960’s relied mainly on the scien-
tific and technical observer. It was soon ob-
vious that photography was the best answer
to “What did you see?” and cameras became
standard equipment. With face pressed
against the plastic viewports and a camera
held either inside or outside the pressure
hull, the diving scientist recorded and de-
scribed details of the undersea world that
over-the-side instruments encountered
mostly by chance. According to Ballard and
Emery (1), almost 200 scientific articles were
published by submersible scientists of the
mid-1960’s; these were based, for the most
part, on visual observations.

537

As scientists and engineers grew accus-
tomed to submersible operating capabilities,
new and modified instruments appeared.
This was inevitable. Visual observations, no
matter how detailed or photographically doc-
umented, required supporting data to help
interpret the observed phenomena.

The biologist, for example, not only wanted
to collect organisms but also wished to know
the physical and chemical characteristics of
the water in which they resided. The geolo-
gist, on the other hand, not only required
samples of the bottom, but also wished to
know, among other things, its slope, its cohe-
siveness and the strength of near-bottom
currents. The diving engineer or salvor,
while increasing his understanding of an in-
strument’s or object’s performance, wanted

to do something about it, and he became
interested in tools for cutting, grasping or
repairing. The result was a wide variety of
specialized instruments for particular sub-
mersibles; some worked well, others not at
all.

Only in very few instances was the owner
or operator of a submersible its primary
user. In the commercial field the vehicle was
equipped to perform the basic functions of
safe diving and viewing, and the owner an-
ticipated that, for the most part, the user
(lessee) would supply his own equipment for
special tasks. Where the owner was the user,
e.g., International Hydrodynamics, the sub-
mersible was equipped with instrumentation
the owner/user felt was necessary to perform
the advertised services. In general, this lat-
ter requirement, in addition to equipment
required by the pilot to assure safe opera-
tions, included lights for viewing and photog-
raphy, cameras, depth gages, echo sounders
and manipulators. Essentially, the scientist
or engineer hailed an underwater taxi. If
much more than safe transportation was de-
sired, he had to supply the additional capa-
bilities himself.

In the early 1960’s, the submersible diver
had very few instruments from which to
choose: Underwater lights, cameras and
depth gages were available from over-the-
side systems. Echo sounders were numerous,
but the transducers were those convention-
ally mounted on surface ship hulls only a few
feet below the surface, and the great pres-
sures exerted on these externally-mounted
devices could affect their beam pattern and,
hence, the accuracy of the data. Water tem-
peratures could be measured by adapting
over-the-side instruments, as could sound ve-
locity and current velocity. The last could be
used only when the vehicle was bottomed.
Some bottom sampling capability existed,
but only in the form of 1- to 2-foot-long cores
of soft sediments or small, loose fragments
that could be scraped or picked from the
bottom. In some instances it was possible to
obtain measurements from instruments
within the pressure hull. Cosmic ray pene-
tration was measured in this manner from
TRIESTE prior to its record dive. But, for
the most part, the user of submersibles was
forced to either improvise his own instru-

538

ment or modify existing ones to particular
tasks and submersibles.

Manufacturers of oceanographic equip-
ment were interested in this potentially bur-
geoning market, but several factors caused
them to proceed with caution. Predominant
among these was the lack of a clearly defined
need to produce an instrument or instru-
ments which would find a wide market (2).
One-of-a-kind instruments are expensive to
design and produce and are not always prof-
itable when they must be made to perform
under the high pressure, low temperature
deep ocean environment. In the event an
instrument was successful, what would be
the size of the market? In the incipient sub-
mersible industry there were no clearly de-
fined missions where a specific instrument
could be expected to find application on ev-
ery dive and every vehicle. Private industry
was understandably hesitant to invest its
own funds and time developing instruments
for which there might be no market. Indeed,
considering the wide variety in submersible
characteristics, an instrument designed to
work on one might not be adaptable to any
other. Consequently, the scientist and engi-
neer was left mainly to his own devices in
developing instruments and work tools.

CONSTRAINTS ON
SUBMERSIBLE
INSTRUMENTS

The utility of an instrument or work tool
from a submersible is governed by 1) dimen-
sional and performance constraints (includ-
ing weight & balance) of the submersible
itself, 2) the overall submersible system and
its method of operation and 3) safety consid-
erations to passengers, support personnel
and the vehicle.

Most scientific instruments consist of a
sensor and a recorder—the former located
outside the pressure hull and the latter in-
side. Both the seawater environment and the
submersible’s internal environment apply a
peculiar set of operating conditions. Assum-
ing the vehicle’s payload can accommodate
the instrument, the following are the major
constraints one must deal with to employ an
instrument safely and successfully.

Hatch Diameter

Ranging from 15.75 to 30 inches in diame-
ter in different submersibles, the user must
be certain that his instrument will physically
fit inside the pressure hull. In some in-
stances the outside diameter of the hatch
can be several inches greater than the inside
diameter, the latter, of course, being the
controlling dimension. ALUMINAUT pre-
sents a unique problem in that its pressure
hull hatch is 19 inches in diameter, but its
sail hatch is only 17.75 inches. Submersibles
with plastic bow viewing domes offer more
flexibility because the dome can be removed
for installation of devices larger than the
hatch.

Internal Location

Instruments must be positioned to avoid
interference with operational controls, crew
safety and comfort, access to junction boxes
and fuses, viewing and access to emergency
breathing or escape devices. If more than
one instrument is to be visually monitored,
they should be grouped closely together to
conserve movement. In the cramped confines
of the smaller submersibles it may be diffi-
cult to meet these requirements if several
instruments are desired.

Electrical Interference

Submersible electrical power cables are,
for the most part, unshielded (3). Therefore,
to prevent the vehicle’s electronics from in-
terfering with scientific instruments the lat-
ter’s cables should be shielded and physical
separation of thru-hull penetrators for both
should be sought. Shortest possible cable
runs assist in further minimizing interfer-
ence.

Electrical Power

Submersible-supplied electrical power is
characterized by surges and spikes; there-
fore, voltage regulators for each instrument
are desirable. It is not uncommon for DC
voltages to drop about 20 percent during a
long duration dive (4).

Internal Atmosphere

The atmosphere in a submersible is char-
acterized by extremes which may be detri-
mental to electronics. In the tropics and sub-

539

tropics, high temperatures and high humid-
ity prevail on the surface and at shallow
depths; condensation with drippage charac-
teristically occurs with greater, colder
depths. Electrical power is usually too lim-
ited for an air conditioning system or the
like. Light levels within the pressure hull are
low and digital read-outs or dials should be
lighted or luminous.

Connectors/Penetrators

There is no standard electrical connector
or penetrator; therefore, a complete change
of instrument terminations may be required.
The reliability of underwater connectors still
leaves a great deal to be desired.

Entanglement

Where instruments are external to the
submersible’s fairings, they must be de-
signed to minimize entanglement with cables
or ropes or other protruberances. In the
event that such entanglement is a possibil-
ity, provisions should be made to jettison the
instrument.

Wave Slap

Under-tow instruments can be torn loose
or severely damaged by wave slap and
should be either designed to withstand 1,000
psi or located to neutralize its effects—pref-
erably both.

Unhindered Data

Placing an instrument within the vehicle’s
fairings might preclude the free flow of
water necessary to obtain realistic data; this
should be considered when locating the in-
strument, as well as the possible influence of
the submersible itself upon the data.

Attachment

Every submersible differs in the method
by which instruments may be attached;
there are no standard mounting racks. When
an instrument is attached below the vehi-
cle’s waterline, the mounting configuration
should be designed for quick attachment or
release by divers. Towed vehicles—such as
ALUMINAUT and other large submersibles—
fall into this latter category.

Trim and Ballasting

The metacentric height is usually so low on
submersibles that even a small instrument
mounted in the wrong location may cause a
significant change in trim characteristics. In
the same vein, a protruding instrument may
change the hydrodynamics or “flight”? char-
acteristics of a vehicle and, consequently, its
control underway. Thus, weight and balance
calculations must precede attachment. A
payload of several hundred pounds does not
necessarily mean that the entire payload
capability can be used at one location on the
vehicle, but instead, it may have to be dis-
tributed equally throughout.

Corrosion and Fouling

The great majority of submersibles are
brought aboard ship following each dive and
washed down with fresh water. Conse-
quently seawater corrosion and fouling by
marine organisms is usually not a problem.
The large, towed vehicles, however, are sub-
ject to both problems. Corrosion of instru-
ments has not been severe because very few
of the large submersibles have operated un-
der a contract for sufficient continuous pe-
riods of time to encounter a serious corrosion
problem. Fouling, on the other hand, was a
problem during BEN FRANKLIN’s pre-Gulf-
stream drift testing period. BEN FRANK-
LIN’s mooring was in an area of considerable
water circulation where goose-neck (Bala-
noid) barnacles attached to the vehicle and
its equipment. In a 3-week period, the barna-
cles (2-3 mm across) colonized the protective
glass covering over the camera lenses, the
strobe light bulbs and transducer heads to a
density of 80-100 individuals per square inch
(Fig. 11.1). This was cause for concern as the
vehicle was scheduled for a 30-day submer-
gence and such a colonization/growth rate
could be detrimental to the mission. Investi-
gation into available anti-fouling methods
revealed no positive deterrent; consequently,
no protective measures were taken. At the
end of the 30-day submergence, careful in-
spection revealed no fouling organisms pres-
ent; it was deduced that BEN FRANKLIN,
drifting at a rate equal to the current, was
unsuitable as a home for organisms depend-
ent upon water moving past them to supply
food and remove waste products.

540

Fig. 11.1 Barnacle-encrusted transducer after 3 weeks in Port of West Palm Beach,
Fla. (NAVOCEANO)

Pressure (Depth)

While it may appear obvious to be certain
that an instrument can sustain the maxi-
mum pressures anticipated on a dive without
leaking or imploding, there is a safety factor
which should be included in their design. For
example, in 1965 the PC-3B was conducting
a 600-foot cable survey dive in the Bahamas,
and it had an externally-mounted acoustic
pinger for surface tracking. The pinger was
advertised for a 600-foot depth capability,
which was absolutely true, for at 610 feet
there was a cannon-like bang produced by
the imploding pinger. A safety factor in in-
struments at least equal to that of the sub-
mersible should be included, not only to as-
sure use of the instrument but also to avoid
the possibility of creating an implosion
shockwave that might be sufficient to crack
a viewport.

Negative Buoyancy

Several ocean bottom instruments (corers,
sound velocity probes, bearing strength
probes, etc.) and engineering tools

(wrenches, drills, etc.) depend upon the sub-
mersible’s manipulator to apply force either
into the bottom or against other surfaces; to
do so, the vehicle must be capable of obtain-
ing sufficient negative buoyancy to remain
stable while the instrument or tool moves. In
many cases the submersible cannot obtain
sufficient buoyancy and, for example, in-
stead of the corer penetrating the bottom,
the submersible rises off the bottom by vir-
tue of its light weight. The problem is similar
to those of outer space and near-weightless-
ness and is a serious consideration. In 1967
ALUMINAUT was frustrated in this way
while attempting to collect 3-foot-long sedi-
ment cores off St. Croix. When ALUMI-
NAUT?’s manipulator inserted the hollow cor-
ing tube to approximately 10 inches in the
sediment, further application of vertical
force caused the 76-ton (dry weight) sub-
mersible to rise off the bottom.

=
6
4} '
J} }
i y
Leia
a} —~.
poe .
; SENGRAL O¥Namics “\
: Te Rare"
ea” fs
a we

Launch/Recovery

Several instruments have been used from
submersibles which are lightweight and
bulky (Fig. 11.2). While successful employ-
ment may be realized under ideal conditions,
the user must consider the impact of foul
weather which might move in during the
dive and create a surface situation which
endangers the instrument during retrieval.
DEEP QUEST experienced this situation
and, by colliding with the forward bulkhead
of TRANSQUEST’s stern well, lost a camera
to the sea. ALVIN experienced a similar re-
trieval problem and lost, but later salvaged,
its mechanical arm (5).

The above considerations concerning scien-
tific and engineering instruments on sub-
mersibles took many years and many dives
to evolve. While many of the problems were
anticipated, their frequent occurrence was
not. For example, Table 11.1 lists problems

Fig. 11.2 Acoustic receiving array on STAR II. (USNUSL)

541

TABLE 11.1 SUMMARY OF INSTRUMENTATION PROBLEMS DURING NAVOCEANO OPERATIONS

Submersible and Date

CUBMARINE PC-3B

6/2/66

6/7/66
6/8/66

6/9/66

6/10/66
6/15/66

ALVIN
9/6/66
6/15/67

6/20/67

6/22/67

DEEPSTAR 4000
11/3/67

11/11/67

11/22/67

STAR Ill
3/8/67
3/9/67
3/11/67
3/29/67

4/5/67

ALUMINAUT
10/12/66

orPwh —

1.
2.

Problem

. no reply from transponder
. No recorder in system

. low transponder signal amplitude

. No transponder reply after 3 hr
. pulse amplitude not above noise level
. transponder replies erratic (+ 10 ms)

. synchronous pinger erratic
. transponder failed

. external camera erratic

. One transponder signal lost in noise

. external camera inoperative

. transponder navigation system marginal

. precision depth gage erratic

. external camera not operating continuous

. sound velocimeter erratic
. current meter failed

. external camera failed

. internal cine-camera failed
. transponder inoperative

. thermistor inoperative
. volume reverberation experiment cancelled

. movie lights could not be turned off
. TV marginal
. No photography

. one external camera inoperative

. transponder system erratic

. Strobe light inoperative

current direction indicator failed
temp-depth erratic

542

nrPwonm —

ils
2.

Cause

. batteries did not take charge
. No internal space available

. batteries not fully charged

. (same as above)
. Noise radiated by vehicle sources
. unknown

. radiated noise interference
. internal failure — bad transistor

. marginal power supply

. interference from CO, scrubbers

. camera flooded

. high temp. & humidity, interference

from Fathometer, radiated inter-
ference

. radiated noise and voltage surges

when ballast pumps activated

. intermittent internal ground

. radiated noise and voltage surges
. flooded connector

. broken lead in connector

. ground in motor drive

. internal failure

. internal failure
. cracked mounting frame could not

support weight of hydrophone

. high pressure malfunction

. interference from pinger
. strobes broken during launch
. stbd. camera flooded

. acoustic interference from tracking

pinger

. broken lead in connector

internal failure
subbottom profiler interferes

TABLE 11.1 SUMMARY OF INSTRUMENTATION PROBLEMS DURING
NAVOCEANO OPERATIONS (Cont.)

10/19/66 1. strobe lights inoperative
2. magnetometer erratic

3. no focus on TV camera

10/24/66 1. strobe lights out of synch.
2. no photos on one camera
1/9/67 1. partial photo coverage
2/14/68 1. random strobe firing
8/4/68 1. magnetometer inoperative
8/9/68 1. side-scan sonar marginal
8/10/68 1. side-scan sonar failed

BEN FRANKLIN
6/30/69 1. SVSTD data incorrect

7/15/69 1. subbottom profiler inoperative

2. transmissometer failed

1. broken connector

2. interference from subbottom
profiler

3. flooded cable

1. long, impregnated cables
2. camera flooded

1. film advance erratic
1. voltage regulator malfunction

1. low resistance between leads due to
salt water leakage in hull penetrator

1. acoustic, electrical and mechanical
noise generated by other systems

1. high temperature and humidity
causing over-load actuation

1. temperature sensitive component in
logic unit

1. overload to power amplifier probably
caused by external leak in hull
penetrator

2. outboard electronics flooded

7/16/69 1. magnetometer failed 1. ruptured diaphragm in magnetometer
head
2. 70-mm camera system malfunction 2. strobe cable splice flooded
7/14/69 - 8/14/69 1. SVSTD data not continuous 1. magnetic tape takeup occasionally

and causes of instrument failures on several
different submersibles encountered by the
Naval Oceanographic Office from 1966 to
1969. From these and other frustrations
grew the realization of the need to develop
dependable, safe and operationally applica-
ble instruments and work tools.

Considering the numerous obstacles to in-
strument development and application, it is
surprising that any were successful, but
through desire and necessity a wide array of
scientific equipment has been employed. The
variety is so great, indeed, that it verges on
the encyclopaedic to describe all of them.
Instead, an overview of the more or less
successful instruments is given. In some in-
stances these devices were used merely as
part of a test and evaluation program to

543

uneven

determine the feasibility and desirability of
conducting various measurements from sub-
mersibles.

The scientific instruments discussed below
are those described in various technical jour-
nals or special reports. Undoubtedly, there
are other instruments which were employed
on one or more tasks, the details of which are
not available. Hence, the instrument tabula-
tion is not truly comprehensive, but serves
as an indication of the approaches taken and
the potential thus provided for using sub-
mersibles in ocean endeavors. A most com-
prehensive and detailed description of hand
tools and mechanical accessories for sub-
mersibles is given by Winget (6). For the
potential designer and user of submersible
tools this report is recommended.

For the sake of convenience, the different
types of submersible instruments are sepa-
rated into three categories: Surveying, re-
search and engineering. The three are not
mutually exclusive and there is much over-
lap of tasks and tools.

SURVEY INSTRUMENTS

An oceanographic survey may be defined
as a mission to determine the spatial and/or
temporal variations in one or more environ-
mental parameters. It may also include col-
lection of samples. Surveys generally estab-
lish what, where, how many and what size.
Research, on the other hand, answers “why.”
Engineering missions encompass such tasks
as the inspection, repair or salvage of a piece
of hardware or other artifact. Inspection of
cables, pipelines or recovery of equipment
are examples of an engineering mission. The
overlapping of instrumentation can easily be
seen from the fact that, at one time or an-
other, all of these tasks may require the use
of tape recorders, cameras, manipulators or
samplers. From 1965 through 1970 the U.S.
Naval Oceanographic Office conducted sur-
veying operations with several different sub-
mersibles to provide design and performance
specifications and operational techniques for
oceanographic surveying instruments. The
primary emphasis of this project was toward
military oceanographic surveys, the goals of
which are sometimes at variance with aca-
demic or commercial surveys, but the tech-
niques and instruments used are similar.
Because this was the only major effort to
test and evaluate the use of the manned
submersible and contemporary equipment in
undersea surveying, the results of this work
are taken to represent current instrument
capabilities.

Initially, the Oceanographic Office started
with the small PC-3B; thence to the larger
ALVIN; STAR III; DEEPSTAR 4000; ALU-
MINAUT and finally, BEN FRANKLIN. By
the time of the Gulfstream Drift (July 1969),
the project had resulted in the design and
assembly of an on-board instrument survey-
ing capability equal to that of a 280-foot
survey ship of the AGS class. The BEN
FRANKLIN instrument suite during the
Gulfstream Drift (7) is used as the prototype

544

description of a manned submersible survey
instrument capability. Full details of these
instruments are contained in reference (8).
Table 11.2 presents the weight and dimen-
sional characteristics.

Water Column

The attempt to establish the what, where
and how of many oceanographic surveys
commences at the outset of a dive. Although
the survey may be geological in scope, the
descent to the bottom is not spent leisurely,
because journeys through hydrospace may,
at any time, provide some unusual observa-
tions through the viewport. A suite of water
sensing instruments was developed to supply
complementary data for observations and to
augment the basic store of oceanographic
data.

a. Water Sensor Pod: (Figs. 11.3 & 11.4)

Operation: The salinity, temperature,
sound velocity, and depth sensors are in an
underwater housing functioning continu-
ously and are scanned sequentially by a re-
corder. A fifth data word is generated by a
logic element which is the sequential time
word. Eleven other data channels are availa-
ble for auxiliary inputs into the recorder. All
16 data channels are scanned by the tape
recorder every 2 seconds. Any of the four
parameters measured by the WASP sensors
may be monitored on a Nixie display.
Data: (Bisset-Berman Model)

Salinity 30 to 40 ppt +0.04 ppt
Temperature —2° to +35° C +0.03°C
Sound Velocity 1.4 to 1.6 km/sec +0.14 m/sec
Depth 0-6100 m +0.25% (full scale)
Time 6-24 hr +0.01% (full scale)

b. Dissolved Oxygen: (Fig. 11.5)

Operation: The sensor is a polaro-
graphic electrode. An oxygen permeable
membrane covers the sensor head. Oxygen
diffusing through the membrane generates a
small electric current. The sensor responds
to oxygen partial pressure, but use of tem-
perature-compensating circuitry allows cali-
bration in parts per million of dissolved oxy-
gen by weight.

Data: (Beckman: Minos DOM PN
148250) Sensor output is converted to fre-
quency in a format compatible with the re-
cording unit of the water sensor pod or other
recording and display units.

TABLE 11.2 WEIGHTS 1 AND DIMENSIONAL2 CHARACTERISTICS OF SURVEY INSTRUMENTS

Sensor Digitizer Nixie Display Recorder
(Wt) (Dim) (Wt) (Dim) (Wt) (Dim) (Wt) (Dim)
Water Sensor Pod 98 (air) 25x7 30 7x19x13 5 4x7x8 30 7x19x13
(Bisset-Berman) 80 (wat)
Ambient Light Meter 50 (air) 15x4 (Meter Display)
(A.C. Electronics) 15 (wat) 15 5x10x19
Light Transmissometer 22 (air) 60x5 (Power Supply & Readout) —(Rustrak)
(Hydro Products) 5 (wat) 8 12x8x7 5 4x6x6
Current Meter 20 (air) 27x10 (Meter Display)
(Hydro Products) 5 (wat) 8 8x5x4 5 4x6x6
Oxygen Monitor 15 (air) 3%x19 (Terminal Unit Readout)
(Beckman) 7.5 (wat) 13 7x19x5 3/8 5 4x6x6
35mm Camera 70 (air) 31x9 (Contro! Box)
(EG&G) 15 (wat) 10 11x8x4
Strobe (250 W/sec) 54 (air) 32x5
(EG&G) 38 (wat)
Side Scan Sonar 26 (air) 36x4 (Strip Chart)
(EG&G) 6 (wat) 90 11x33x18
Sub-Bottom Profiler 99 (air) 19x19x14 (Power Supply/Strip
(O.R.E.) 55 (wat) Chart) Recorder
30 14x19x12
70mm Camera 28 (air) 24x8 (Control Box)
(Hydro Products) 8 (wat) 10 9x6x6
(Varian)
Magnetometer 20 (air) 20x6 (Counter-Barringer) (Strip Chart)
8 (wat) 12 19x10x6 20 19x12x14
Gravity Meter 100 (air) 20x19x48 (Meter Display)
(LaCoste & Romberg) 150 36x36x36
T hounds
Zinches
Depth: 3,000 meters 0 to 5 VDC
Accuracy: + 3% of reading Power: 115 VDC, 15 amp
Temperature c. Ambient Light: (Fig. 11.5)
Range: —2° to + 35°C Operation: Natural light transmitted

545

Fig. 11.3 Bissett-Berman (Plessey) water sensor pod with pressure housing re-
moved. Components in cage measure salinity, temperature, sound velocity and
depth. (WHOI)

down from the sea surface is caught by a
cosine collector, passed through a narrow
band interference filter with transmission
peak matching that of seawater and meas-
ured by a photomultiplier. A temperature-
compensating circuit reduces the effect of
temperature on the photomultipliers. The re-
sulting measurements of light flux are re-
corded on an open channel of the water
sensor pod.

Data: (A.C. Electronics Model) Under
static solar radiation conditions at the sea
surface, the change in light flux with depth
is a measure of the diffuse extinction coeffi-
cient of the seawater. Also, at levels below
which natural light can penetrate, the lumi-
nescence of passing biological life can be
monitored.

546

Fig. 11.4 Water sensor pod logic and recorder components (above and below).
(WHO!)

TRACKING
‘PINGER

_ CURRENT METER,

oe

es

UNDERWATER -

DISSOLVED
OXYGEN SENSO

omens <

R-
i

Fig. 11.5 Ambient light meter, dissolved oxygen sensor, current meter and other equipment aboard DEEP QUEST.

Light flux: 0.225-9,000 picowatts/cm?. path of seawater and is a measure of water
d. Light Transmission: clarity (or turbidity).

Operation: A collimated light beam of Data: (Hydro Products Model) The taut
known intensity is passed through a baffled band meter in the readout unit displays the
tube. At 1-meter water distance the residual water clarity in terms of percent of transmis-
light is monitored by a photocell. The output sion.
of this photocell is dependent on the amount Alpha Range: 0.1 to 2.2 In/m +3% at mid-
of light transmitted through the 1-meter range.

547

e. Water Currents: (Fig. 11.5) Accurate
measurement of water currents from a sub-
mersible is conducted when the vehicle is
bottomed. Because ocean currents are varia-
ble in time and space and the submersible
data of very short time duration, the data
thus obtained is representative of only the
period and precise location of the measure-
ment. Inaccuracies in submersible heading
and speed while underwater, and the small
relative magnitude of currents, preclude
computing true from apparent current veloc-
ity as is done with wind velocities on ships.
Drifting within the current and being
tracked from the surface, as was BEN
FRANKLIN, can be a method of measure-
ment, but it is too expensive and restricted
for normal operations. Similarly, drifting and
measuring one’s speed and direction with
Doppler sonar is accompanied by the same
restrictions. Consequently, this instrument
has been affixed to many submersibles owing
to its ease of installation and operation, and
its relatively low cost.

Operation: Current speed is monitored
by a Savonious rotor with 10 magnets
equally spaced on a perimeter base. A mag-
netic switch counts the pulses per time inter-
val and the speed is registered on a taut
band meter such that 83.5 rpm equal 1 knot.
Current direction is sensed by a vane which
is connected magnetically to a compass. Al-
lowable inclination from the vertical is 20
degrees.

Data: (Hydro Products Model) Absolute
current speed (in knots) and direction (rela-
tive to magnetic north) are graphed continu-
ously with time.

Current Speed: 0.1-6.0 knots +2%
Current

Direction: 0-360 degrees +7

Bottom

Ocean bottom information is required for a
variety of reasons. For example, to design,
install and maintain cables, the following
bottom and near bottom information is re-
quired: Nature and size of bottom materials,
slope, strength, presence of artifacts (wrecks,
cables, pipelines), sediment stability, cur-
rents and, if the cable is to be buried or
plowed under, whether or not solid rock out-

548

crops or horizons underlay an apparently
soft ocean floor which may prohibit plowing.
While BEN FRANKLIN carried no bottom
sampling instruments on its drift mission,
such capability is mandatory for a surveying
submersible. Hence, various bottom sam-
pling devices will be included in this section
and will serve to represent those capabilities
developed for research and engineering.
a. Stereophotography System: (Fig. 11.6)

Operation: To obtain the widest possi-
ble coverage, two cameras and two strobes
were mounted in tandem with only minimum
overlap of their fields of view. Stereo pairs
are achieved by overlapping successive pho-
tographs in each camera. Each side can be
fired in succession or independently. Each
camera is pre-focused so that the bottom can
be photographed at ranges from 15 to 50 feet.
The minimum time between exposures for
each camera is 4 seconds.

Data: (EG&G Model 207) This system
can supply 3,300 stereo-pair photographs of
the sea floor without reloading.

Adjustments: f/4.5 to f/22; 1/10-1/200 sec.

Exposure rate: 4, 6, 8, 10, 12, and 24
seconds and manual.

b. Side Sean Sonar: (Fig. 11.7)

Operation: Each transducer emits a
0.1-millisecond, 110-kHz pulse at a regular
interval (0.1, 0.2, or 0.4 sec). The beam pat-
tern is only 1 degree in the horizontal plane
but approaches 60 degrees in the vertical
plane. As the submersible advances, echoes
from acoustic reflectors in the insonified
area are recorded on a strip chart.

Data: (EG&G Model) The acoustic map
resulting from this sonar provides a three-
dimensional facsimile of the prominent relief
features on both sides of the submersible’s
path to ranges of 250, 500 or 1,000 feet.
Resolution of 1/250 of full scale is normally
realized.

c. Subbottom Profiling: (Fig. 11.8)

Operation: The transducer emits a
pulse of no less than 105 decibels (on axis) of
5-kHz acoustic energy in a 50-degree beam
towards the bottom. Portions of this pulse
are reflected at each interface encountered
and these echoes are picked up as they ar-
rive back at the transducer. A synchronized
blade on the recorder registers the arrival of
each echo on wet recording paper. The sweep

it

AVIEWPORT-” fy
JEWPO!

4

*

35MM CAMERA

ee

‘ f= arr

on see. Pomerat

= PORT CAMERA
STROBE LIGHT

® y 7 a * R
___ STARBOARD CAMERAP =~
- SUIOBE LIGHT ae => 35MM CAMERA

amine am
err eee

Fig. 11.6 Stereophotograph system on STAR III. The entire system is jettisonable (NAVOCEANO)

Fig. 11.7 EG & G side scan sonar recorder and transducer. (NAVOCEANO)

549

Fig. 11.8 ORE subbottom profiler, transducers and recorder. (NAVOCEANO)

rate and paper speed in the recorder are
selectable.

Data: The system (O.R.E. Model 1200
Subbottom Profiler) provides a record of the
ocean bottom and its substructure under the
submersible’s track.

Pulse Length: 0.3, 0.5, 1.0 and 2.0 milli-
seconds.

Sweep Rate: 50, 100, and 200 sec.

Paper Speed: 100, 200, 300, and 500
seans/in.

d. Bottom Samples:

The floor of the ocean may range from soft,
soupy, mud plains (unconsolidated) to hard
rock (consolidated) cliffs. Between the two
ranges is a variety of combinations. To ob-
tain samples of both consolidated (hard) and
unconsolidated (soft) materials a variety of
instruments has been developed and used.
The reader is urged to consult reference (6)
for a detailed and comprehensive discussion
of these devices.

1. Unconsolidated Sediments
Cores—(Fig. 11.9) By pressing a hol-
low, narrow cylindrical tube into the sedi-
ment with the vehicle’s manipulator, sedi-
ment samples up to 3 feet in length have
been obtained. An exploded view of this de-

550

vice is shown in Figure 11.10. Benthos Ine.
(10) manufactured a 6-barrelled piston corer
specifically for DEEP QUEST which drives a
4-foot-long, 2.6-inch-diameter corer into the
sediment with a pair of shock cords. A drive
shaft retracts the core tube from the sedi-
ment.

Scoops—(Fig. 11.9) Anything from a
tin can to a specially designed scoop has been
used with a manipulator to obtain a shallow
sample of the bottom.

Dredges—(Fig. 11.9) A steel mesh
dredge may be mounted under the bow of the
submersible and by running along the bot-
tom the vehicle can scoop up large fragments
while sifting out the fines.

Grabs—Merely picking up and stor-
ing of rock fragments is accomplished
through the vehicle’s normal grasping hand.
Using both manipulators DEEP QUEST re-
trieved a 328-pound rock from 2,800 feet.

2. Consolidated Sediments

Drills—Hard rock rotary drills have
been developed and used by Woods Hole
Oceanographic Institution and International
Hydrodynamics Corporation (11), and are ca-
pable of taking 4-inch x 0.75-inch and 10-inch
x 5/s-inch cylindrical cores, respectively. The
WHOI corer (Fig. 11.11) is held in the manip-

MANIPULATER!
HAND ss

sy
Si

SEDIMENT |

ra,

Fig. 11.9 ALVIN's jettisonable bottom sampling aluminum brow. All the designated sampling devices are employed by the manipulator which is also used to collect grab samples. The
dredger is employed by making ALVIN negatively buoyant and pushing the dredge into the sediment. (WHOl)

ulator while the diamond cutting bit rotates
and water flows through the drill to flush
away mud generated through cutting. At
desired penetration, drill rotation is re-
versed, as is water flow, and the drill assem-
bly is rocked slightly to assist in seizing and
breaking off the core specimen. The core is
held in the hollow corer by the reverse water
flow until ejected into a sample container by
once again reversing the flow of water.

The tethered GUPPY employed a more di-
rect, brute-force approach to hard rock cor-

551

ing. A Schlumberger Side Wall Corer was
installed outside the pressure hull and aimed
horizontally to fire hollow bullets into an
outcrop. The resulting sample is about 1 inch
in diameter by 2.5 inches in length. The corer
has a capacity to take 24 individual samples
on one dive. Mr. William Watson, of Sun
Shipbuilding and Dry Dock, relates that sev-
eral hundred samples were collected in this
manner, but he acknowledges that an assess-
ment of the effects on viewports and other
structures is in order. The pressure wave

Fig. 11.10 Exploded view of plastic core tube, quiver and closure stopper. (WHOI)

Fig. 11.11 ALVIN's hard rock rotary corer. (WHOl)

552

from the charge was considerable and at 600
feet it was felt all over the submersible.

Pry Bars and Splitters—A wide vari-
ety of pries and splitters has been made
which conforms to a specific vehicle’s manip-
ulator hand and are used to pry or split
samples from hard rock.

Geophysical Measurements

Magnetics:

Operation: Since submersibles are made
primarily of steel, magnetic measurements
must be made so that the sensing device is
beyond the influence of the vehicle. In the
case of ALUMINAUT a boom only 8 feet long
provided sufficient isolation (12), while the
steel-hulled BEN FRANKLIN required that
the sensor be buoyed in a glass sphere 150
feet above the submersible (Fig. 11.12). The
total magnetic field strength is indicated by
measuring the precession rate of polarized
hydrogen nuclei in the sensor. The generated
frequency is amplified, counted, and dis-
played in gammas and recorded on a strip
chart or digitized.

Data: Measures the total ambient mag-
netic field with respect to time over a select-
able range of 20,000 or 100,000 gammas to an
accuracy approaching +1 gamma.

Gravity:

Two approaches to gravity measurements
have been taken, one with the submersible
bottomed and stable, and the second with the
submersible underway. In the first case, a
La Coste & Romberg gravimeter (Model 5)

Fig. 11.12 Magnetometer sensor and glass float on BEN FRANKLIN. An explosive
guillotine device served to cut the 150 ft of cable in the event of an emergency.
(NAVOCEANO)

was used aboard DEEPSTAR 4000 (13), AL-
VIN (14) and others to obtain average devia-
tions from station to station. In the second
case, an Askania gravity meter (Fig. 11.13)
was used aboard ALUMINAUT and a La
Coste & Romberg meter aboard BEN
FRANKLIN. A comprehensive and detailed
report of the techniques and merits of con-
ducting gravity measurements from sub-
mersibles is presented in reference (15).
Operation: The gravity sensor is sus-
pended in a gimbal and allowed to hang
level. It consists of a mass which is a damped
hinged beam, a spring with adjustable ten-
sion and a photo-cell to measure the beam’s
motion. Variations in gravity upset the bal-
ance of the set spring tension and weighted
beam. The resultant motion is caused by
change in spring tension, which has been
calibrated to indicate a change in gravity.

Fig. 11.13 Underway gravity measurements were taken with this Askania gravity meter aboard ALUMINAUT. (NAVOCEANO)

Data: The instrument is a relative
gravity meter and must be calibrated at a
known station. It is used only in the slope
mode, i.e., the rate of change of the beam
position is recorded with time on a strip
chart. The generated slope is read as a
change to the spring tension of dial divisions.
The dial divisions are then converted man-
ually to mgal (0.001 cm/sec?). The range is up
to 12,000 mgal +1-2 mgal.

Photography

A variety of cameras and techniques for
their employment has been devised for use
aboard specific vehicles (Fig. 11.14). Basically
there are two options: Mounting the camera
outside of the pressure hull, or photograph-
ing through the viewport. On BEN FRANK-
LIN two 70-mm cameras and a television
camera were mounted externally on a pan
and tilt mechanism forward. The television
camera was monitored internally and served
to aim the 70-mm cameras. A strobe light
furnished the lighting. A second system en-

Fig. 11.14 Various still camera and strobe configurations: a) STAR /// with plankton

sampler and cameras arranged for stereophotographs, b) STAR // and c) PC-3B with

single camera and strobe, d) Pan/Tilt unit with two 70-mm cameras, a TV camera for
aiming and a light. (a & b USNUSL, c & d NAVOCEANO)

554

tailed photographing through a forward
viewport with a hand-held 70-mm camera
(Hasselblad) which was electrically con-
nected to an external strobe light. This latter
system allowed photographing of both small
organisms which clustered near the viewport
and of larger features. In other vehicles
thru-port photographs have been obtained
by using external flood (viewing) lights for
illumination in liew of a strobe light.

Operation: The stobe is positioned to
light the field of view as seen from a particu-
lar viewport. The 70-mm cameras, with cor-
rected normal angle lenses, are set and cali-
brated to take stereophotographs of this field
of view on command from a control box.
Aperture settings from f/2.8 to f/16 are set
prior to installing the cameras in their hous-
ings with focus distances available from 18
inches to infinity. The shutter is triggered
from the control box and the film advances
automatically in 1 second. The strobe light
(250 W/sec) requires a 3-second cycle time.
The number of frames exposed is counted by
the control box and any picture can be
“fogged” from the control box for later refer-
ence.

Data: (Hydro Products Model 750) 450
Stereo pairs. 70 mm B&W or color.

Cine or motion pictures have been ob-

555

tained through the viewports with 8-mm and
16-mm cameras of virtually every make and
model using viewing lights for illumination.
A brief, but highly informative report on the
problems, equipment and techniques in-
volved in photography specifically from sub-
mersibles is given by DEEPSTAR 4000's ex-
pilot R. Church (16). For a broad and detailed
description of underwater photography and
associated equipment reference (17) is recom-
mended. Additionally, Eastman Kodak pub-
lished a brochure Bibliography of Underwa-
ter Photography and Photogrammetry (Ko-
dak pamphlet P-124) which presents 280 ref-
erences on this subject published from before
1950 through 1968. The Eastman brochure
can be obtained from their Department 942,
Rochester, New York 14650.

Compared to the exacting nature of the
preceding instruments and the candid eye of
the camera, it is quite legitimate to question
the need for man. It is not only possible, but
a well demonstrated fact that all of these
instruments can be packaged and dispatched
on the end of a cable to perform as well as
they do strapped to a submersible. The scien-
tific advocates of submersibles are fre-
quently plagued by their engineering associ-
ates who question the value of data that has
no numbers, calibration curves or range of
accuracies. Most frustrating to the natural-
ist is the engineer’s uncanny ability to best
him with electronics in everything but knot
tying. To partially justify the human eye
undersea Figure 11.15 is presented. This
drawing was made by Mr. Andres Pruna,
formerly of the U.S. Naval Oceanographic
Office, during PC-3B’s operations on a cable
route survey in the Bahamas. The depths
and distances were obtained from instru-
ments, but the panoramic view, the perspec-
tive and the accompanying descriptions
came from the human occupant’s ability to
see and relate to another human what he
observed. Undoubtedly, photographs could
have been taken (and many were) to show
precisely what artist/biologist Pruna has
captured on his sketch pad. But photographs
show the letter of the law, the observer
captures its spirit, and if we are to truly
understand the ocean, then its spirit as well
as its anatomy must be understood.

BARRIER REEF

OUTER PLATFORM

SPURS AND GROOVY

REEF

TRENDING NORMAL TO

MOST LUXURIANT RAL DEVELOPMENT BETWEEN |2 TO 20h

MARGINAL (RIM) ESCARPMENT

FIGURE 5 ANDROS

\.

‘ 4 j- SOM.
eS Se

rr )

Wi )

Xie

ISLAND TO MARGINAL ESCARPMENT, TYPICAL BOTTOM FEATURES

Fig. 11.15 Andros Island to marginal escarpment, typical bottom features. (Andres

RESEARCH INSTRUMENTS

The instruments used for oceanographic
research from submersibles range from dis-
carded beer cans to sophisticated electronic
devices. In the former case, the amount of
sediment accumulation atop a “flip top” beer
can was estimated by R. F. Dill from the
DIVING SAUCER in 1965. Since the intro-
duction of this type of can into the particular
area was known, estimate of settlement ver-
sus time was attained. Between beer cans
and sophisticated electronics are perhaps 2,-
000 dives made for research purposes; and,
the equipment used varies almost with dive-
to-dive frequency.

The greatest variety of research instru-
mentation originated within the Navy Elec-
tronic Laboratory’s deep submergence pro-
gram beginning with TRIESTE I in 1959 and

Pruna)

556

terminated with DEEPSTAR 4000 in 1968.
In the course of these 10 years NEL con-
ducted research dives in support of biology,
geology, acoustics, physics and geophysics.
Each diving scientist, of which there were
some 20, equipped the bathyscaph or the
submersible with off-the-shelf or newly de-
signed equipment suitable to his task. Sev-
eral hundred dives were made and the differ-
ent equipments are legion, and, in many
instances, one of a kind for a particular dive.

On the east coast of the U.S. the Navy’s
Underwater Sound Laboratory in New Lon-
don was involved with acoustic research and
also designed a variety of instruments to
measure and observe the behavior of under-
water sound.

Other countries—including Canada,
France, Russia and Japan—were also active

during the late 50’s and 60’s, but not to the
extent found in the U.S. Where the Japanese,
Russian and French were interested for the
most part in fisheries and biology, U.S. inter-
ests were more catholic (1). The result of
these international efforts was to add an
even wider variety of instruments to the
research inventory. To gain an appreciation
of the widespread nature of these research
efforts, the report of Ballard and Emery (1)
is recommended and their exhaustive bibli-
ography may be consulted for specific de-
tails.

Owing to the diversity of research equip-
ment and its one time application, each in-
strument will not be described. Instead, a
tabulation of instruments applied to re-
search within various disciplines will serve
as being representative; this is presented in
Table 11.3. In the same vein, Figures 11.16
through 11.19 are included to present an idea
of the instruments developed, versatility of
submersibles and the imagination of their
users to adapt over-the-side instruments to
deep submergence applications.

In spite of a variety of instruments, the
majority of research dives relied primarily
on human observation and photographic doc-
umentation, and secondarily on the collec-
tion of samples. The reasons for this reliance
are worth considering. According to Ballard
and Emery (1), of 346 scientific articles pub-
lished in 1970 concerning submersibles in
oceanography, 208 (57%) dealt with biology,
fisheries and geology, while the remainder
dealt with physical oceanography, acoustics,
geophysics and other kinds of missions. Ma-
rine geology and biology from submersibles
are, by and large, descriptive sciences. It
follows that observations and photography
are the main investigative techniques. A re-
cent example of this dependence on photo/
visual observations is the MUST program’s
260 dives with eight different submersibles
(Sept. 1971-Dec. 1972) where photography
and vision were the primary instruments. In
addition to the collection of geological sam-
ples, one must conclude, therefore, that ex-
ploration of the Lewis and Clarke variety—
observing and collecting—will play the major
part of in situ undersea research for some
time to come.

5357

ENGINEERING/INSPECTION/
SALVAGE INSTRUMENTS

Within this category are grouped submers-
ible tools and instruments used to accom-
plish tasks or gather information not related
solely to an understanding of the natural
environment.

Basically, engineering/inspection/salvage
missions and their most commonly used in-
struments and devices can be grouped as
follows:

uae Gere gn Se ae
Inspection X xX
Salvage xX xX xX xX
Excavation X xX
Hardware

Adjustment x
Observation X X
Rescue xX xX
Artifact

Mapping Xe X

As with research instruments, none of the
above is necessarily standard; each was de-
veloped or purchased to perform a particular
task. The critical ‘instrument,’ however, is
the human and his ability to assess the situ-
ation in situ and employ the vehicle to ac-
commodate prevailing and changing circum-
stances. There are few, if any, precedents to
follow in underwater work of this nature.
Consequently, the successful mission is a
reflection of the imagination and ingenuity
of the personnel. A description of the tools
and techniques employed in several of these
tasks will serve to demonstrate this point.

Ordnance Retrieval (Ref. 41)

The submersibles PISCES I and III were
contracted by the U.S. Navy in 1969-70 to
recover practice torpedoes from a 1,360-foot-
deep test range in Howe Sound, British Co-
lumbia. A 47-kHz pinger allowed range au-
thorities to track the torpedo to the bottom.
With a hydrophone attached to its manipula-
tor in the vertical upward position, PISCES
used the same pinger for “homing in” on the
torpedo. PISCES usually clamped smaller
(less than 200-lb) torpedoes with its arm and

Submersible

Aluminaut

Alvin

Ben Franklin

Deep Quest

Date

1969

1966

1966

1966

1966

1966

1966

1966

1967

1967

1971

1969

1969

1970

TABLE 11.3 RESEARCH DIVES AND INSTRUMENTATION

Max
Depth
(Ft)

6178

5850

2750

3550

4900

4900

4950

615

1789

1832

800

1800

1800

4068

Location Task
Puerto Rico Sedimentology
Bermuda ls. Biology
Bahama Is. Optics
Bahama ls. Soil Mechanics
Bahama Is. Geophysics
Bahama Is. Geology
Bahama ls. Acoustics
New England _— Physics

Blake Plateau

Blake Plateau © Suspended

Particles

Gulf of Maine — Soil Mechanics
Gulf Stream Acoustics
Gulf Stream DSL Studies

Pt. Loma, Calif. Soil Mechanics

Physico-Chemical

Purpose

Study lateral variations in
closely-spaced sediment cores

Near-bottom organism samp-
ling

Underwater visibility tests

Sediment
studies

bearing strength

Gravity measurements at se-
lected sites

Sub-bottom _ profiler
ation

evalu-

Determine magnitude of fluc-
tuations in normal incidence
bottom reflectivity data

Measure temperature micro-
structure at thermocline

Measure small-scale tempera-
ture-salinity variations in
water column and within
sediment interstitial waters

Determine the nature and
quantity of suspended mate-
rial in the water column

Obtain measurements of sedi-
ment bulk density and pene-
tration resistance

To record ambient noise and
bottom reflected sound sig-
nals from surface explosions

To record and measure back-
scatter from sound trans-
mitted at varying frequen-
cies and pulse lengths

Compare sediment bearing
strength measurements ob-
tained /n situ vs. those at-
tained from cores

558

Instrument(s)

3-ft long plastic cores inserted
by manipulator

Two plankton sampling nets
on bow, manipulator actu-
ated

Black and gray targets on
bow-mounted rack

Variously configured concrete
clumps dropped from sur-
face and observed from
submersible
LaCoste-Romberg Field Gravi-
meter

EG&G Sediment Probe/echo
sounder system with 12-kHz
transducer

12-kHz transducer and a
calibrated receiving system

Manipulator-held 5-ft long rod
with thermistors at each end

Bottom probe to measure
sediment resistivity; ther-
mistor to measure water
temperature

Plastic water samplers closed
by manipulators; TV-type
test pattern target mounted
on sample rack

Nuclear (gamma) density
probe and static cone pene-
trometer

hydro-
7-channel

Externally-mounted
phone; internal
tape recorder

3.5 and 12 kHz transducers,
tape recorder and strip chart
recorder

Diversified Marine Corp. Mod-
el SA-1040 Sediment Shear
Measurement Device. Shock-
cord-driven, 5-ft long sedi-
ment corers

Ref

33

18

14

14

14

19

18

20

20

21

21

TABLE 11.3. RESEARCH DIVES AND INSTRUMENTATION (Cont.)

Sn

Max
Depth
Submersible Date (Ft) Location Task Purpose Instrument(s) Ref
Deep Quest 1972 4034 San Diego Soil Mechanics Provide bottom sediment in- Static cone penetrometer (4-ft 24
Trough formation for development penetration) and vane shear
of a geotechnical test area device (11.2-ft penetration)
DS-4000 1966 2700 Mission Beach Geophysics/ Bottom reconnaissance and Model “S''LaCoste—Romberg 13
Calif. Geology gravity measurements gravimeter
1966 4000 Various off Acoustics Attain information to derive Fjarlie bottles (4 ea.) withre- 26
Calif. and accurate sound speed equa- _ versing thermometers, Vibra-
Mexico tions and anomalies trons (2 ea.) pressure depth
gages, sound velocimeters
(3 ea.), temperature probes
(2 ea.) and one salinometer
1966 2820 San Diego Acoustics Obtain in situ bottom data Onan aluminum tube hanging 13
and samples to calculate from brow: 4 geophones to
accurate values of acoustic receive output from 6 elec-
bottom loss tric blasting caps. Geophone
Output recorded on internal
tape.
1966 3978 Lausen Sea Physico-Chemical Measure: Physical-chemical Fjarlie bottles, temperature 13
Mount properties of seawater af- sensors, bottom temperature
fecting sound; water motion _— probe, savonius current me-
near sea floor; sediment ter
thermal structure.
1966 960 San Diego Bio-acoustics Measure /n situ target strength A 14-kHz transducer (5-degree 13
Trough of Marine organisms cone width) was positioned
to transmit and _ receive
sound pulses; a 1-in. steel ball
was placed in position to
serve as a target reference
strength
1966 2448 San Diego Bio-acoustics DSL investigations “Fish Slurper’’ Biological 13
Trough sampling device
1966 3378 San Diego Acoustics Determine /n situ sound veloc- Three probes on arigid frame, 25
ity and attenuation in upper _ each holding a barium titan-
sediment layers. ate transducer, were inserted
into the sediment to a depth
of 2 ft.
1966 4080 San Diego Radiation Attain an ambient background A sodium iodide crystal pho- 13
Measurements gamma radiation profile of | tomultiplier mounted exter-
the water column for future nally and a rate meter
comparison (counter) carried internally
1967 3300 Cozumel Is. Currents Observe and photograph cur- A metal bucket (also serving as 27
Mexico rent shear velocities through the anchor) containing a

the use of dyes

259

gasoline-filled clorox bottle
and two dye cakes attached
to a line between bucket and
bottle was deployed by the
manipulator

Submersible

DS-4000

DS-2000

Pisces I, II, III

SP-350

Star III

Techdiver

Date

1967

1966

1971

1968

1968

1972

1970

1965

1966

1969

TABLE 11.3. RESEARCH DIVES AND INSTRUMENTATION (Cont.)

Max
Depth
(Ft) Location
ae San Clemente,
Calif.

1197 San Diego

-- San Clemente,
Calif.

-- Northwest
Canada

-- Northwest
Canada

-- Hudson Bay
Canada

— Georgian Bay,
Canada
San Diego

2000 Western

Atlantic

60 Canada

Task

Geology

Soil Mechanics

Mineralogical
Survey

Ice Observations

Geology

Geology

Physico-
Chemical
Acoustics

Acoustics

Biology

Purpose

Measure bottom slope and
conduct geological recon-
Naissance

Compare /n situ vs. laboratory
measurements of sediment
shear strength

Determine the feasibility of in
situ mineral surveys from
submersibles

Record back-scattering from
underside of ice

Collect samples of bottom

Collect samples of bottom

Conduct various water column
measurements

Obtain data on the spatial
correlation of ambient noise

Measure reverberation
characteristics of DSL

Quantitative survey of scallops
on the sea floor

560

Instrument(s)

External lights (one pointing
directly downward and one
45-degrees forward) were
aligned by maneuvering the
sub to where they both
coincided on the sea floor;
at this point the sub is
horizontal to the slope and
angle is measured internally

Vane shear apparatus coupled
with 2 plastic core tubes

A Californium-252 neutron
source was affixed to a 12-ft
boom and used to activate a
known sample, a radiation
detector under the brow was
used to measure the
activated sample

12-kHz transducer pointing
vertically upward with
recorder inside pressure hull

Hydraulic hammer for
breaking bedrock; hydraulic
clam-shell grabber to obtain
large blocks and boulders

Hydraulically-driven, rotary,
hard-rock corer taking cores
10-in length and 5/8-in
diam.

Boom-mounted eH, pH, and
oxygen/temperature sensor

Geometrically-spaced
hydrophones_ (6ea.)
suspended on bow-mounted

rack
Parabolic acoustic reflector/

transducer system on bow to
insonify and record returns
from DSL

Wheel odometer suspended
from sub. to measure dis-
tance and a recorder (man-
ual) internally to count
visual observations of scal-
lops

Ref

34

34

36

35

35

11

23

37

40

38

TABLE 11.3. RESEARCH DIVES AND INSTRUMENTATION (Cont.)

Max
Depth
Submersible Date (Ft) Location Task Purpose Instrument(s) Ref
Trieste | 1957 10496 Mediterranean Acoustics Measure ambient sound level Vertical and horizontal arrays 28
vs. depth of hydrophones; 4 receiving
transducers
1960 7500 Guam ls. Gravity Conduct bottomed gravity LaCoste-Romberg geodetic 29
measurements gravimeter Model G
1960 18900 Guamls. Physics Attain water temperature pro- Resistance bridge and revers- 29
file ing thermometer
1961 3870 San Diego Currents Investigate character of low- Metal grid with heavy nylon 30
Trough order-of-magnitude currents yarn streamers attached.
near-bottom. Camera to record angle of
streamers for subsequent
comparison against calibra-
tion curve
1960 18900 Guam ls. Acoustics Obtain water sound speed and Sound velocimeters, Nansen 31
temperature measurements bottles with reversing ther-
in situ mometers
1957 1968 Mediterranean Light Penetration Study daylight extinction vs. A photomultiplier tube inside 32

blew ballast to surface. With larger torpe-
does 1,500 feet of braided polypropylene line,
buoyed at the surface, was secured to
PISCES’ manipulator and, with the torpedo
clamped, the manipulator was jettisoned and
later retrieved by hauling in the buoyed line
from the surface. At times, the torpedo was
buried beneath the sediment. In such in-
stances a 5-hp, electric motor drove a pump
attached to PISCES’ manipulator which
sucked up mud and deposited it several me-
ters away. In this fashion the bottom was
“dug out” until the torpedo was located. In
12 months 120 torpedoes were retrieved us-
ing these methods. In a similar manner the
PISCES-class vehicle has been used to exca-
vate the bottom for burial of cables. Lock-
heed developed a special device for large
object recovery for DEEP QUEST, shown in
Figure 11.20.

Submersible Retrieval (Ref. 43)

ALVIN was lost in 1968 when a cradle cable
broke during launch and she descended 5,500
feet deep off Cape Cod. ALVIN was subse-

depth

a deep-sea camera housing

561

mounted atop the bathy-
scaph’s sail

quently photographed and precisely located
by a towed “fish” which showed it sitting
upright on the bottom; a transponder and
flashing light was installed very close to
ALVIN which served as a reference point for
ALUMINAUT. From USNS MIZAR a toggle
bar was lowered at the end of 7,000 feet of
4¥%-inch-cireumference nylon line; 500 feet
from the toggle bar two 1,000-pound lead
balls were attached and a Stimson anchor
below these. A flashing light was attached 50
feet above the toggle and a few feet above
was a transponder for MIZAR to interrogate.
On its first dive ALUMINAUT was guided by
MIZAR to ALVIN and found the hatch open.
Attempts to place the toggle bar inside the
hatch were futile until a second dive when
ALUMINAUT inserted a new toggle bar into
the hatch and attached its 25-foot-length of
6-inch line to the original lift line; MIZAR
then lifted ALVIN to the surface.

Instrument Retrieval (Ref. 42)
To retrieve a 2,930-foot-long current meter
array from the 3,150-foot depth off St. Croix,

Pw SOUND \ ow”
Hy VELOCIMETERS|

By

TEMPERATURE
SENSOR

a

‘Gye
a THERM

SALINOMETER

Fig. 11.16 DEEPSTAR 4000 prior to a dive for the Naval Electronics Laboratory. The slightly negatively buoyant instrument brow is jettisonable and uses syntactic foam to provide

buoyancy for the instruments. The water bottles (Fjarlie) are sealed, and filled, when desired, by spring-loaded caps actuated by solenoids. The current meter is placed on the bottom

and an electric cable connects it to a Rustrak recorder within the hull. The plastic bag contains fluorescein dye, it is opened on the bottom by the manipulator and is used to observe

water movements. Above the dye bag, but not visible, are 36-in-long probes which hold thermometers along their sides and are stuck into the bottom to measure water/sediment
temperatures. (NUC)

562

tnnanantaseag

\ nn SYNTACTIC
FOAM

PLASTIC
DYE BAG

mpCURRENTNG :
METER ©

Fig. 11.17 DEEPSTAR 4000 equipped with various instruments for an investigation of the water column. Behind the reversing thermometers are water sampling bottles. The details of
this work are contained in ref. (50). (NUC)

363

Fig. 11.18 a) Asediment strength measuring probe deployed by ALUMINAUT at 6,000 ft. The rings provide depth of penetration data and an accelerometer within a glass sphere
inside the cylindrical housing provides supporting information. The glass sphere is retrieved by retracting the pin on the right which allows the sphere to surface. (NAVOCEANO)

b) STAR Ill’s parabolic acoustic reflector transducer system was used to monitor reverberation of deep scattering layers. It also includes a stereo camera system. (Gen. Dyn.)

c) A diver adjusts an apparatus on ALUMINAUT which was used in an experiment to measure sediment consolidation. When ALUMINAUT's manipulator retracted one of the rings, a
steel ball of known dimensions and density fell to the bottom, a camera photographed the sediment cloud produced and subsequently, the imbedded ball itself. (NAVOCEANO)

d) A close-up of the reversing thermometer racks shown in Fig. 11.17 The solenoids (left) released the thermometer rack from its upright position when activated. (WHOl)

564

Fig. 11.18 c

Fig. 11.18 b

965

Fig. 11.18d

Virgin Islands, ALUMINAUT carried 2,300
feet of 1/2-inch nylon line coiled about a pipe
protruding from one side of a wooden. disc
(Fig. 11.21). The array was visually located,
and the bottom of the coiled line was at-
tached to the array line with the manipula-
tors. The beehive-shaped coil was then
placed on the bottom and ALUMINAUT, to
which the opposite end of the line was at-
tached, surfaced and the line paid out. When

ALUMINAUT surfaced the load was trans-
ferred to a surface ship which subsequently
hauled in the array with five current meters
and one acoustic release mechanism. Grap-
neling for the lost array was impractical
because of several telemetry cables which
traversed the bottom in the same area. A
similar approach was used by DEEP QUEST
to recover a Navy fighter plane from 3,400
feet off San Diego in 1970.

a)
Fig. 11.19 a) The Benthos-manufactured sediment corer designed for DEEP QUEST. (Benthos Corp.)
b) Plastic water samplers developed by WHOI. The sampler is rotated by the manipulator to open the lead-weighted doors and then purged by moving it through the water. Further
rotation closses the flap valve doors to collect a water sample. (WHO!)
c) An oil-filled compass attached to DEEPSTAR 4000's manipulator provides directional information to augment observations of the bottom
d) Manufactured by HYCO to cut a sunken tugboat’s anchor chain, the hydraulic cutter attached to the manipulator of PISCES / is capable of exerting 60,000 pounds of pressure on
its case-hardened steel blade. (HYCO)

567

ee

ee aes

568

Fig. 11.20 Designed by Lockheed for DEEP QUEST, this device is attached to the vehicle's keel for retrieval of torpedo-size objects. (LMSC)

569

X

INSTRUMENT PLANT AND RETRIEVAL

Fig. 11.21 ALUMINAUT's current meter array retrieval technique. (NAVOCEANO)

570

Submersible Rescue (Ref. 44)

The submersible DEEP QUEST became
entangled in a 3/s-inch polypropylene line
attached to a 1,600-pound (wet weight) recov-
ery device at a 430-foot depth off San Diego.
Not wishing to jettison its expensive equip-
ment to surface and with the boat at a
precarious trim angle, Lockheed manage-
ment called in NEKTON to cut the line. A
diver’s knife was tied to the smaller vehicle’s
3-foot-long mechanical manipulator and it
cut the line 13 hours after DEEP QUEST
became entangled. In a similar but less ur-
gent task, the bathyscaph ARCHIMEDE
freed the unmanned SP-3000 from a depth
of 3,400 meters in 1971 in the Mediterranean
(45). SP-3000 was being lowered on a test
dive. A weight was attached 17 meters below
on a nylon cable to counteract the submers-
ible’s positive buoyancy. The lowering cable
attachment to the vehicle unscrewed and SP-
3000 sank to the bottom where it remained
“at anchor.’ No equipment was in existence
that could operate at 3,400 meters to cut the
cable. Three devices were immediately de-
signed and manufactured: A double system
of cleavers placed on the fender of AR-
CHIMEDE, two rotating shear devices and a
mechanical shear with springs. All three sys-
tems were fitted on the bathyscaph for its
dive. SP-3000 had both an external pinger
and transponder. ARCHIMEDE used the pin-
ger to determine the azimuth of SP-3000
and advanced to within 1,350 meters of it
when its CTFM detected the transponder.
The bathyscaph was maneuvered into a posi-
tion where the rotating shear was used to
cut the cable and allow SP-3000 to surface.
Interestingly, from a historical point of view,
the first SP-350 hull (then DIVING SAU-
CER) was lost 14 years earlier in an identical
fashion (46).

Hardware Inspection

A number of submersibles have been used
to inspect cables, pipelines, offshore struc-
tures and a variety of other hardware. Such
missions incorporate visual observations, TV
video recorders and still and motion picture
cameras. The types of instruments vary ac-
cording to the submersible. In one mission
SHELF DIVER followed a diver while he
inspected a pipeline and supplied his breath-

571

ing gas mixture from a hose within its lock-
out compartment (Fig. 11.22); in another in-
stance, the same vehicle inspected 0.6 mile of
the inside of a 15-foot-diameter pipe carrying
fresh water beneath the French Alps.

Artifact Mapping (Ref. 47)

The submersible ASHERAH was used by
the University of Pennsylvania to map ster-
eophotographically a 4th century Roman
shipwreck in 130 feet of water off Bodrum,
Turkey. The resultant photomosaic (Fig.
11.23) of the 20- x 40-foot area was used to
produce a topographic chart with an accu-
racy of 1.5 inches in three dimensions.

To conduct this work the following instru-
ments were used:

2— 70-mm cameras (Hydro Products PC-

750)
2— 20-W/sec strobe lights

Fig. 11.22 SHELF DIVER behind the diver. (Perry Sub. Builders)

Fig. 11.23 Photomosaic of a 4th century Roman shipwreck taken by ASHERAH. (Univ. Penna.)

Television camera (Hydro Products
TC0303) mounted between the 20-mm
cameras

TV monitor (Sony PVT 304R U) in
pressure hull

Tilt sensor (General Precision C70
9560) to obtain vehicle’s pitch and roll
with each camera exposure

Isobaric altimeter (differential pres-
sure gage) to define a horizontal plane
parallel to mean sea level and assist
the pilot in maintaining constant
above-the-bottom altitude

Bendix Fathometer (200-kHz) to indi-
cate distance-to-bottom

Magnesyn compass to provide azimuth
direction

372

1— Photographic recorder (Nikon F) to ob-
tain a permanent record of tilt, altime-
ter reading and camera frame number.

The cameras were adjusted to expose at a

preselected interval in concert with the
strobes. Proceeding at a predetermined com-
pass course the pilot attempted to maintain
a distance of 15 to 20 feet off the bottom
using the Fathometer and the altimeter for
guidance. With each exposure of the 70-mm
camera there was a synoptic exposure of the
35-mm camera to record the vehicle’s atti-
tude for subsequent photographic analysis.
Similar results were obtained by Pollio (9)
using STAR III and 35-mm cameras. The
choice of 35-mm versus 70-mm format is in-
fluenced by trade-offs. A 70-mm film provides

better resolution, but the present number of
exposures attainable (400) is far less than
that of the EG&G 35-mm (3,300).

Ship Salvage (Ref. 48)

In concept, the salvage of a 95-ton, 51-foot
tug (Fig. 11.24) in Howe Strait, B.C. from 670
feet was similar to ALUMINAUT’s recovery:
Lift lines were lowered from the surface
instead of reeled up from the bottom. The
difference lies in the tools required for the
tug salvage by PISCES I. After anchoring a
lifting barge with a four-point moor over the
sunken tug, a plan was devised whereby
PISCES I would cut two anchor chains on

the tug’s bow at the windlass to allow inser-
tion of a toggle bar into each of the hawse
pipes after the anchor chains slid clear. A
sling would then be passed from the bow to
the stern of the ship providing fore and aft
lines for the required horizontal lift.
Whereas no hydraulic chain cutter existed, a
blade cutter of 60,000-pound force was made
by the owners of PISCES in 5 days to cut the
5/g-inch-thick chain. After much difficulty
both anchors were removed and one toggle
inserted; the second toggle, however,
jammed in the hawse pipe. A 65-pound
weight was bolted to the manipulator to pro-
vide the submersible with a hammering ca-

Fig. 11.24 The 95-ton EMERALD STRAITS. Retrieved from 670-foot depth in 1969 with lines attached by International Hydrodynamic's P/SCES |. (HYCO)

pability. Because PISCES had to be maneu-
vered back into position after each blow, 10
hours of pounding were consumed before the
toggle was successfully driven home. Pre-
vious to the toggle insertion, the submersible
assisted in maneuvering the wire rope sling
from bow to stern. Prior to lifting, PISCES
made a final inspection of the tug and lift
lines to assure that all components were
secure.

Dumping Ground Inspection (Ref. 49)

Increased environmental awareness has
prompted a number of recent diving opera-
tions which are of both an engineering and a
research nature. DEEP QUEST dived off the
coast of Southern California in 1972 to deter-
mine the possible harm and other results of
dumping contaminated industrial and radio-
active wastes, garbage and trash in water
depths of 6,000 feet. Visual observations and
photographic/TV coverage were used to as-
sess and document the condition of the con-
tainers and the obvious effects on the envi-
ronment. A salinity/temperature/depth sys-
tem and light transmissometer were used to
measure in situ conditions. A core sampler
and multi-rosette water sampler (General
Oceans Inc.) were used to collect samples for
subsequent laboratory analyses.

The instruments described above are
largely for scientific investigations, but pres-
ent submersible work is in the engineering,
e.g., hardware inspection, repair, implant-
ment, area. Unfortunately, there is a scarc-
ity of publications dealing with the tools of
this trade, possibly because some are pro-
prietary and some may not perform as well
as anticipated. Whatever the reason, the ab-
sence of such accounts is detrimental to the
field at large, because it leaves each user to
his own devices to try, through trial and
error, to derive working, practical instru-
ments. As a result, when progress is on such
an individual basis it can be painfully slow.

REFERENCES
1. Ballard, R. D. & Emery, K. O. 1970 Re-
search Submersibles in Oceanography.
Mar. Tech. Soc. Pub., Wash., D.C., 70 pp.
2. Hull, E. W. S. 1967 Those remarkable
little work boats. Geo. Mar. Tech., v. 3, n.
5, p. 22-40.

574

10.

11.

12.

13.

14.

15.

16.

We

. Haigh, K. R. 1970 Instrumentation Inter-

ference in submersibles. Mar. Tech. Soc.
6th Ann. Sym., v. 2, p. 1189-1201.

. Hawkins, L. K. & Merrifield, R. 1970 In-

strumentation on manned submersibles.
U.S. Naval Oceanographic Office, I.R.
No. 70-8, 28 pp.

. Rainnie, W. O., Jr. 1968 Adventures of

ALVIN. Ocn. Ind., v. 3, n. 5, p. 22-28.

. Winget, C. L. 1969 Hand Tools and Me-

chanical Accessories for a Deep Sub-
mersible. W.H.O.I. Tech. Rept. Ref. 69-
32, 445 pp.

. Busby, R. F. 1970 Oceanographic Instru-

mentation on the submersible BEN
FRANKLIN. Trans. Mar. Tech. Soe. 6th
Ann. Conf. & Expo., v. 2, p. 1041-1078.

. U.S. Naval Oceanographic Office 1970

Manned Submersibles and Underwater
Surveying. Special Rept. 153, 156 pp.

. Pollio, J. 1969a Applications of underwa-

ter photogrammetry. Mar. Tech. Soc.
Jour., v. 3, n. 1, p. 55-72.

Benthos, Inc., Falmouth, Mass. Subma-
rine Piston Corer Benthos Type 343..
Thomson, M. F. & McFarlane, J. R. 1972
Submersible development in Canada.
2nd Int. Ocn. Dev. Conf., Japan, v. 1, p.
799-809.

Higgs, R. H. & Carroll, J. C. 1967 ALUMI-
NAUT magnetometer operation, St.
Croix, Virgin Islands 1966. U.S. Naval
Oceanographic Office, I.R. No. 67-33, 28
pp.

U.S. Naval Undersea Center 1968 DEEP
STAR logs (1 through 4); U.S. Naval
Undersea Center, San Diego, Calif., 202
pp. (Unpub. Manuscript)

Busby, R. F. & Merrifield, R. 1967 Under-
sea studies with the DSRV ALVIN, Ton-
gue of the Ocean, Bahamas. U.S. Naval
Oceanographic Office, Informal Rept. No.
67-51, p. 54.

Thompson, L. D. 1968 Gravity meter tests
on the Deep Research Vehicle ALUMI-
NAUT, Vieques, Puerto Rico. Final
Rept. of U.S. Naval Oceanographic Of-
fice, Cont. No. N62306—68-60008. Items 2
& 4.

Church, R. 1969 Abyssal photography
from DEEPSTAR-4000.Jour. Mar. Tech.
Soc., v. 3, n. 1, p. 95-100.

Society of Photo-Optical Instrumentation

18.

19.

20.

21.

22.

23.

24.

25.

26.

27.

28.

Engineers, 1968 S.P.I.E. Seminar Pro-
ceedings, Underwater Photo-optical In-
strumentation Applications, v. 12, Feb.
1968.

Woods Hole Oceanographic Institution
1967 Deep Submergence Research Con-
ducted During the Period 1 January
through 31 December 1966. W.H.O.1.
Ref. No. 67-23, 23 pp.

Breaker, L. C. & Winokur, R. S. 1967 The
variability of bottom reflected signals
using the deep research vehicle ALVIN.
U.S. Naval Oceanographic Office, I.R.
No. 67-92, 19 pp.

Milliman, J. D., Manheim, F. T., Pratt, R.
M. & Zarudski, E. F. K. 1967 ALVIN Dives
on the Continental Margin off the
Southeastern United States. W.H.O.I.
Ref. 67-80, 48 pp.

Inderbitzen, A. L., Simpson, F. & Goss, G.
1970 A Comparison of In-Situ and Labo-
ratory Vane Shear Measurements. Lock-
heed Missiles and Space Company Re-
port 681703, 35 pp. (Unpub. Manuscript)
Perlow, M., Jr. & Richards, A. F. 1972 In-
Place geotechnical measurements from
submersible ALVIN in Gulf of Maine
soils. Reprint from 4th Ann. Offshore
Technology Conf. Houston, Tex., May
1972, Paper No. OTC 1543.

Sly, P. G. 1971 Submersible Operations
in Georgian Bay and Lake Erie—1970.
Canadian Dept. of Energy, Mines and
Resources Tech. Bull. No. 44, 36 pp.
Hirst, T. J. 1973 Vertical variability of
sediment shear strength. Mar. Tech. Soc.
Jour., v. 7, n. 1, p. 21-24.

Hamilton, E. L., Bucker, H. P., Keir, D. L.
& Whitney, J. A. 1969 In-Situ determina-
tions of the velocities of compressional
and shear waves in marine sediments
from a research submersible. Naval Un-
dersea Research and Development Cen-
ter, San Diego, Calif., TP 163, 26 pp.
MacKenzie, K. V. 1968 Accurate depth
determinations during DEEPSTAR-
4000 dives. Jour. Ocn. Tech., v. 2, n. 2, p.
61-67.

Merrifield, R. 1969 Undersea Studies
with DEEPSTAR-4000. Oct.-Nov. 1967,
I.R. No. 69-15.

Maxwell, A. E., Lewis, R., Lomask, M.,
Frassetto, R. & Rechnitzer, A. 1957 A

575

29.

30.

31.

32.

33.

34.

35.

36.

37.

38.

39.

preliminary report on the 1957 investi-
gations with the bathyscaph, TRIESTE
(Unpub. Manuscript)

Rechnitzer, A. B. 1962 Summary of the
bathyscaph TRIESTE research program
results (1958-1960). Naval Engineering
Laboratory Report 1095, San Diego,
Calif., 63 pp.

LaFond, E. C. 1962 Deep current meas-
urements with the bathyscaph TRI-
ESTE. Deep-Sea Res., v. 9, p. 115-116.
MacKenzie, K. V. 1961 Sound-speed
measurements utilizing the bathyscaph
TRIESTE. Jour. Acous. Soc. Amer., v. 33,
n. 8, p. 1113-1119.

Jerlov, N. G. & J. Piccard 1959 Bathy-
scaph measurements of daylight pene-
tration into the Mediterranean. Deep-
Sea Res., v. 5, p. 201-204.

Bennett, R. H., Keller, G. H. & Busby, R.
F. 1970 Mass property variability in
three closely spaced deep-sea sediment
cores. Jour. Sed. Petrol., v. 40, n. 3, p.
1038-1043.

Buffington, E. C., Hamilton, E. L. & D. G.
Moore, 1967 Direct measurement of bot-
tom slope, sediment sound velocity and
attenuation, and sediment shear
strength from DEEPSTAR-4000. In.
Proc. 4th U.S. Navy Symp. on Military
Oceanog., v. I, p. 81-90.

Pelletier, B. R. 1968 The submersible
PISCES feasibility study in the Cana-
dian Arctic. Maritime Sediments, v. 4, n.
2, p. 69-72.

Noakes, J. E. & Harding, J. L. 1971 New
techniques in seafloor mineral explora-
tion. Jour. Mar. Tech. Soe. v. 5, n. 6, p. 41-
44,

Assard, G. L. & Hassell, B. C. 1966 Meas-
urements of the spatial correlation of
ambient noise using a deep-submer-
gence vehicle. (DIVING SAUCER-SP-
300). U.S. Navy Underwater Sound Lab-
oratory Rept. No. 714, 19 pp.

Caddy, J. F. 1969 Underwater observa-
tion techniques in fisheries research. in,
MAN IN COLD WATER, Conf. on Under-
sea Operations in the Canadian Environ-
ment, McGill Univ., Montreal, May 12-13
1969, p. 33-34.

Barhan, E. G., Ayer, J. J., Jr. & Boyce, R.
E., 1967 Macrobenthos of the San Diego
Trough: photographic census and obser-

40.

41.

42.

43.

44,

45

vations from bathyscaph, TRIESTE.
Deep-Sea Res., v. 14, p. 773-784.

U.S. Navy Underwater Sound Labora-
tory 1966 Acoustic research studies with
deep submergence vehicles. U.S. Navy
Underwater Sound Lab. Tech. Memo. No.
2211-06-66, (Unpub. Manuscript)
Personal commmunication with R. F.
Bradley, Arctic Marine Ltd., Vancouver,
B.C.

Busby, R. F. 1967 ALUMINAUT retrieves
Current Meter Array. Geo. Mar. Tech., v.
3, n. 5, p. 41-44.

Rainnie, W. O., Jr., & Buchanan, C. L.
1969 Recovery of the DSRV ALVIN, Ocn.
Ind., v. 4, n. 11, p. 62-64.

Vernon, J. W. & Furse, L. D. 1972 Work-
ing small submersibles. Oceanology In-
ternation Offshore Technology reprint,
April, 1972.

. La Prairie, Y. 1972 Recent achievements

576

46.

47.

48.
49.

50.

of the French in offshore technology.
Oen. Ind., v. 7, n. 4, p. 115-120.
Cousteau, J. Y. & Dugan, J. 1963 The
Living Sea. Harper and Row Publishers,
New York and Evanston.

Bass, G. F. & Rosencrantz, D. M. 1968 A
Diversified Program for the Study of
Shallow Water Searching and Mapping
Techniques. Final Report under Office of
Naval Research Cont. N00014-67A-0216-
0002, The Univ. Museum, Univ. Penna.,
Phila., Pa., 130 pp.

Ocean Industry 1972 v. 7, n. 8, p. 51.
Niblock, R. W. 1969 Submersible key to
salvaging tug from 670-ft. depth. Under-
sea Tech., p. 40-42.

Mackenzie, K. V. 1970 Oceanographic
data acquisition system for undersea
vehicles. Preprints, 6th Ann. Conf. &
Expo., Mar. Tech. Soc. Conf., 29 June—1
July 1970, Wash., D.C., v. 2, p. 1078-1098.

SEA AND SHORE SUPPORT

The procedures and support required to
place a submersible on the surface and
“ready to dive” are extensive. To conduct
open-sea diving operations one must have a
means of transportation, a launch/retrieval
system, specialized technicians and shop fa-
cilities for overhaul, maintenance and repair.
The annual cost to maintain an operation-
ally-ready submersible can begin at $80,000
(SEA OTTER), which does not include a sup-
port ship or launch/retrieval system. Larger,
deeper-diving vehicles, such as ALVIN, may
require up to $800,000 or more annually,
which does include a support ship or launch/
retrieval system. No figures are available for
annual support costs of a bathyscaph, but it

li,

undoubtedly far exceeds $1 million in the
case of TRIESTE II.

TRANSPORTATION

Before confronting the sea-going problems,
the submersible operator first must trans-
port his vehicle to a point where it can be
either placed aboard ship or launched for
towing. In some instances, such as the Cali-
fornia-based NEKTON, a cross-country
trailer tow brought it to Lake Michigan; SEA
OTTER was transported from one dive site
to another by a helicopter; in another case,
ALVIN made a trans-Atlantic flight from
Cape Cod to Spain; while ALUMINAUT, too

large for an aircraft, reached the same desti-
nation from Miami, Florida aboard an LSD.
AUGUSTE PICCARD’s trip aboard a flatbed
trailer from Lausanne, Switzerland to Mar-
seilles, France involved intricate scheduling
and the cooperation and participation of po-
lice and local civil officials as the 93-foot
submersible carefully wound its way through
the ancient, narrow streets of southern
France. Obviously, the larger the submers-
ible, the larger the problem, and time is of
the essence, because the user of the sub-
mersible pays for mobilization as well as
diving costs.

Land

Transportation of a submersible by land is
not too different from transporting any ob-
ject of comparable size and weight. Load and
dimension regulations apply the same as
they do with conventional cargo, whether it
be by trailer, flatbed van or rail. One unique
aspect, however, resides with some vehicles’

more delicate instruments, which vibration
may damage or, at the least, loosen nuts and
bolts. Tests performed by the Association of
American Railroads and a summary of accu-
mulated data relative to loading conditions
that exist in a variety of transportation con-
ditions indicate the greatest loading factor to
be 2.25 g vertical. When ALVIN was shipped
by flatbed trailer (Fig. 12.1) from Minneapo-
lis, Minn. to Cape Cod, Mass., shock-measur-
ing instruments were attached and found
the loads to be less than those shocks (1.2 g)
encountered during routine launch/retrieval
aboard LULU. Regardless of the method or
rigors of transport, it is a practice of the
ALVIN group and others to recheck and
tighten all nuts and bolts prior to diving.
When load and dimensions allow, trucks or
trailers incorporating air-ride suspension
systems are used. Obviously, in the case of
large submersibles, such as BEN FRANK-
LIN, a route must be selected which will
avoid bridges under which the vehicle cannot
physically pass.

iy
Ans HOE
GREANOGRAPHIC

INSTITUTION |

ee ya :
7% ae

AFUCE OF NAVAL RESEARCH

Fig. 12.1 ALVIN ready to take to the road. (WHO!)

Fig. 12.2 DSRV-1 entering a C-141A with mating skirt removed. (U.S. NAVY)

In spite of careful planning and handling,
it is not uncommon to sustain damage which
can cause several days’ delay in diving oper-
ation. P. C. Sly (1) related that during air and
road transit from Vancouver, B.C. to Trenton
Air Base on the Bruce Peninsula, and thence
to Tobermory on the Georgian Bay, PISCES
III sustained damage to its drop weight
mechanism, ballast bags and mechanical
arms; three days were required to repair
these and other damages incurred during
the transport phase alone.

Air

Submersible transport by air is accompa-
nied by similar load and dimension con-
straints as found with land transport. Those
submersibles not air transportable by rea-
sons of weight, dimensions or both include

579

ALUMINAUT, BEN FRANKLIN, AUGUSTE
PICCARD, TRIESTE II, ARCHIMEDE and
NR-1. Lockheed’s C-141A is presently the
largest cargo carrying aircraft in the U.S.;
its cargo entrance just accommodates the 8-
foot 2-inch-diameter DSRV with its mating
skirt detached (Fig. 12.2). Even so the 37-ton
submersible must be specially loaded for the
C-141A to accommodate the 13%/4-ton excess
over its normal load capacity. There is no
civilian aircraft of comparable weight dimen-
sions to the C-141A. When the C-5A is opera-
tional its 95-ton capacity will accommodate
all submersibles, with the possible exception
of the bathyscaphs and NR-1. To gain some
idea of the size of the C-5A, it presently
requires three C-141A’s to carry the DSRV
and its support equipment, whereas only one
C-5A can do the whole job.

The critical difference between land and
air transport of submersibles lies in the pos-
sibility of pressure loss within the aircraft
cabin; a loss of this nature may cause bat-
tery gassing, expansion of entrapped air in
hydraulic systems or, at the extreme, pop-
ping of viewports. In some instances, such as
leaking of battery acid, the failure may be
detrimental to the safety of the aircraft as
well as to the integrity of the submersible. A
study performed on the DSRV identified the
potential critical components on the vehicle
with respect to aircraft cabin pressure loss.
Because of the DSRV’s sophistication, it is
believed this list (Table 12.1) encompasses all
components found on any submersible which
might constitute an air shipping hazard.

Sea

Transportation of a submersible as cargo
aboard ship is relatively simple and primar-
ily involves tying it down securely and assur-
ing that a capability to lift it exists at both
the port of embarkation and debarkation.
This latter consideration can be a problem
with the large (over 25-ton) submersibles.
The 142-ton BEN FRANKLIN required two
100-ton-capacity cranes (Fig. 12.3) to handle

Fig. 12.3. The 142-ton BEN FRANKLIN requires two 100-ton (each) capacity cranes
to lift it out of the water. (NAVOCEANO)

TABLE 12.1 AIRCRAFT-HAZARDOUS DSRV COMPONENTS AND MATERIALS

Item Failure Mode

Failure Effect

Oxygen Bottles
Nitrogen Bottles
Air Bottles

Explosion/rupture/leak

Mercury Dump valves open inadvertently

Refrigeration Unit (contains Freon) Rupture/leak

Explosive cutters

Inadvertent detonation

Hydraulic fluid

Rupture of hydraulic line or power unit

Fragments and release of 0», No, or air.

Contamination of aircraft; release of toxic fumes
and chemical reaction with metals.

Under combustion heat would release toxic gas
(phosgene).

Units jettisoned (pan & tilt, manipulators, etc.)
fall free; not considered a hazard.

Spillage of fluid. Fire hazard.

Batteries: Rupture of battery case and box. Electrolyte causes corrosion and skin burns.
Ag-zn Outgassing due to temperature rise above Silicon oil is flammable (flash point 330° F)
Lead-acid 100°F (becomes severe at 140° F) Release of Hydrogen gas.

Fire Extinguishers Rupture/Leak

Release of Carbon Dioxide.

it at dockside. Such capabilities are not in
the inventory of every port facility. It is also
interesting to note that in 1969 each round
trip BEN FRANKLIN made in and out of the
water cost $5,000. Compare this effort with
the handling of STAR I in Figure 12.4.
Because a submersible contains various
materials and components, e.g., batteries,
compressed air —which may be hazardous
under certain conditions, one should consult
Department of Transportation regulations
governing such items. The following regula-
tions govern such shipments:
Land: Code of Federal Regulations 49,
Water: Code of Federal Regulations 46,
Air: Code of Federal Regulations 14.
In the case of military air shipments, there
is a special document entitled ‘‘Packaging
and Handling of Dangerous Materials for
Transportation by Military Aircraft.” For
the Navy this is NAVSUP PUB 505; for the

Air Force, AFN 71-4. The procedures out-
lined can be adopted for shipment by com-
mercial air freight, but the list of hazardous
materials which may be commercially
shipped is more restrictive.

SUPPORT PLATFORMS

The integral part the support platform
plays in submersible operations is seen by
reviewing the functions it performs for the
submersible. These are:

1. Transport (aboard or tow) to dive site,

2. Launch/retrieve at dive site,

3. Accommodate support personnel and
diving party,

4. Carry maintenance and repair equip-
ment and provide sheltered work
areas,

5. Communicate with, track, and direct
the submersible during submergence,

Fig. 12.4 The 11/4-ton STAR | presents fewer handling problems than its large counterparts. (Gen. Dyn. Corp.)

6. Monitor weather and clear traffic for
surfacing,

. Provide means of transport to and
from the submersible,

8. Carry scientific/engineering instru-
mentation and provide storage area for
samples and work area for data reduc-
tion,

9. Conduct supplementary studies or
functions in concert with the submers-
ible before, during or after the dive,

10. Provide a safe haven in the event of

emergency,

11. Fix submersible position in the event

of rescue.

These functions reveal the reason for the
term “submersible system,” for without the
support ship and launch/retrieval device,
there is little a submersible can accomplish
practically, economically or safely. Hirano (2)
wrote the only published discussion of sup-
port ship requirements and commented on
the fact that little mention has been made of
support ships, in spite of their being so inte-
gral to successful submersible operations.

|

Support platforms display a variety of
shapes and characteristics. The majority are
conventional surface ships, but catamarans,
barges, offshore fixed platforms and fleet-
type submarines have been used. A repre-
sentative sampling of these craft is shown in
Figures 12.5 through 12.8.

In very few instances have owners or oper-
ators of a submersible built support plat-
forms specifically for their submersibles.
Generally, submersibles were built first and
support was obtained during or after con-
struction. The only exceptions are DEEP
QUEST’s R/V TRANSQUEST: DEEPSTAR
2000‘s R/V SEARCHSTAR and the DSRV’s
ASR-21 class all being designed to support
the specific vehicle. In a great number of
cases the builder already had an active inter-
est in the ocean and owned a platform which
he equipped with a launch/retrieval appara-
tus suitable for both the platform and the
submersible, e.g., Perry's SEA HUNTER and
SEA DIVER, Cousteau’s CALYPSO, General
Motor’s SWAN. A number of support plat-
forms were obtained on lease by the sub-

USS HAWKBILL (SSN 666)

Fig. 12.5 Submersibles’ support craft

+

yh
T¥SR CP ae

M/V GEMINI

R/V CALYPSO

583

M/V DAWNSTAR

[32 al. dl é

Gat i

M/V MAXINE D
Fig. 12.6 Submersibles' support craft.

584

i

9 ae car BPE ee. ae iar Bata
oe Ae ios oe
Bias jot episod

M/V SEARCH TIDE

M/V HUDSON HANDLER

585

VICKERS VENTURER.
BARROW

M/V VICKERS VENTURER

USS PIGEON (ASR-21)

Fig. 12.7 Submersibles’ support craft.

586

M/V SWAN

UNDERSEA HUNTER

M/V UNDERSEA HUNTER

587

OSAVT LULU

pRIVATEEp

WAM FL

M/V PRIVATEER

Fig. 12.8 Submersibles' support craft

588

Peet eee:
MIV SEA HUNTER

589

M/V TRANSQUEST

mersible owner and equipped with a launch/
retrieval apparatus for a particular contract
or testing period. Examples of these are
Westinghouse’s SEARCHTIDE, General Dy-
namics’ GEMINI and SEA CLIFF and TUR-
TLE’S MAXINE D.

Equipment and facilities aboard the sup-
port platform are governed by operational
and submersible requirements. Battery
chargers, air compressors, routine mainte-
nance and minor repair facilities, dark
rooms, data processing rooms, instrument
repair and maintenance rooms may be pro-
vided by permanent accommodations such as
on ALUMINAUT’s R/V, PRIVATEER, or pro-
vided by mobile vans such as those mounted
aboard SEARCHTIDE. During a long-term
torpedo retrieval contract in Howe Sound,
British Columbia, PISCES I and II were
supported by an anchored barge (Figure
12.9). They were launched therefrom into the

590

water and towed several miles by a small
boat to the dive site. These examples are
used to demonstrate that there is very little
in the way of “standard” submersible sup-
port, and that the requirements change from
job to job and from area to area.

A list of the platforms which have sup-
ported specific submersibles is presented in
Table 12.2. Also included are their specifica-
tions and launch/retrieval systems. To list all
the support equipment aboard a particular
platform at a given time would only reflect
the requirements of a particular job. There
are, however, standard equipments which an
independently-operating support platform
carries when divorced from daily shore sup-
port. In addition to these equipments a sea-
going ship normally carries ship-to-shore
communications, electronic navigation, ra-
dar, echo sounders, ete. The following are
carried specifically for submersible support:

Fig. 12.9 PISCES II and its support barge in British Columbia. (International Hydrodynamics)

391

TABLE 12.2 CHARACTERISTICS OF SUPPORT PLATFORMS

Length Cruise Launch
Overall (Ft) (Ft) Gross Speed Cruise Passenger Retrieval
Platform Submersible (Ft) Beam Draft Tonnage (Knots) Range Accommod.' Systems Remarks
SP-350 5,000 nm Articulated
CALYPSO SP-500 138 24 10 360 12 18 days 10 Crane Conventional Hull
2,300 nm Overhead
DAWN STAR NEKTON 52 16 5.75 45 8 14 days 11 ___ Rail Conventional Hull
Nonarticulated Conventional Hull
GEMINI? STAR Ill 142.5 36 10 181 11.5 N/A Crane (leased)
3860 Submerged
HAWKSBILL* DSRV 292 32 26 (displ.) 15? N/A N/A Platform Submarine
HUDSON
HANDLER PISCES 90 38 9.75 340 30 days Ramp Barge-Type Hull
350
LULU ALVIN 98 48 9 (displ.) 6 1,200 nm 15 Cradle Catamaran
MAXINE D SEA CLIFF Nonarticulated Conventional Hull
TURTLE 165 38 11 198 12 5,000 nm 4 Crane (leased)
PIGEON Cradle
(ASR-21) DSRV 251 85 19 4200 13 10,000 nm 14 (Submerged) Catamaran
PRIVATEER® ALUMINAUT 136 25 9 250 10 N/A 9 Tow Conventional Hull
Articulated
R/V JOHNSON SEA LINK 124 24.5 10.8 210 N/A N/A 15 Crane Conventional Hull
Perry 3,000 nm Stiff Leg
SEA HUNTER® Vehicles 65 14 6.5 75 8 10 days i) Boom Conventional Hull
4,000 nm Nonarticulated
SEAMARK NEKTON 109 24 8.7 177 10 30 days N/A Crane Conventional Hull
SEARCHSTAR> —DEEPSTAR 2000 40 20 5 30 6 30 hours 0 Cradle Catamaran
Articulated Conventional Hull
SEARCHTIDE® DEEPSTAR 4000 155 36 1 199 12 5,000 nm 12 Crane (leased)
Overhead
SWAN? DOWB 136 25 9 250 12 N/A 10 (est.) Rail Conventional Hull
1,500 nm Conventional Forward Hull
TRANSQUEST DEEP QUEST 108 39 7 176 6.5 14 days 12 Cradle Catamaran Stern
UNDERSEA Perry 3,000 nm m Nonarticulated
HUNTER Vehicles 8.5 24 AS) 174 10 21 days 12 Crane Conventional Hull
VICKERS VOL-L1 630 Stern “A"’-
VENTURE® PISCES 118 25 12 (displ.) 10 21 days 8 Frame Conventional Hull
Docking Floating Ory Dock Towed
WHITESANDS TRIESTE II 491 81 15 3000 5 60 days 4 Well Lift By USS Apache (ATF-67)

‘Over and above ship & submersible crew accommodations

Test and Evaluation Platform

battery chargers
air compressors
scuba equipment
submersible tracking system
small boat or rubber raft
citizen band radio
launch/retrieval apparatus
. underwater telephone

in addition the support platform generally
includes a space suitable for a dark room,
“customer” work space and space for instru-
ment maintenance or repair. One of the more
convenient type of ships for submersible sup-
port is the oil supply boat such as SEARCH-
TIDE. Owing to its uncluttered and ample
deck space, portable vans may be placed

seth ok eluent

Submerged speed; with DSRV surface speed 5 knots

592

3No longer operating as support ship

5 The much larger VICKERS VOYAGER also supports these vehicles

aboard to accommodate virtually any re-
quirement, while at the same time allow
space for launch/retrieval apparatus and op-
erations.

LAUNCH/RETRIEVAL
METHODS

“On occasion the sub (PC3-B) would
appear to be in imminent danger of
being dashed against the side of the
ship, only to have the hook suddenly
take hold and pull her free of the
water. Other times she was not so
fortunate. On one particularly rough

day the sub passed under the hook
while in the trough of a large swell,
and the man on top of her was unable
to reach the hook with the bridle. As
she was lifted up by the next swell she
was out of range of the hook. The man
aboard ship who was tending the for-
ward steadying line saw what had
happened, and immediately took a
strain on the line, intending to pull
the sub back into position under the
hook. Of course he succeeded only in
pulling her into the side of the ship,
where she was severely scraped and
banged against the hull.

A similar incident nearly occurred
about a month later when operating
off the ALBANY. This time the crew
had been well briefed beforehand that
if the pilot missed the hook on his first
pass they were to give plenty of slack
in the steadying lines to allow him to
maneuver back into position. Inevita-
bly, one rough day we missed the
hook, and the man tending the after
steadying line immediately threw the
line into the sea. CUBMARINE, back-
ing away from the ship at the time,
backed over the free floating line, and
fouled her screw. This left her with no
maneuvering power. Fortunately, the
ALBANY deck crew was successful in
pulling her under the hook by using
the forward steadying line.

More than once a steadying line
fouled or broke loose. Then the sub
would pivot on the hook and her bow
or stern would crash into the side of
the ship. The momentum gained by the
free-swinging, three-ton submarine was
certain to cause damage. The bow was
damaged twice. Once the propeller of
the thruster motor was snapped off,
and the other time a bowplane guard
was bent out of alignment. The stern
took even more punishment. One blow
damaged the rudder and snapped the
rudder pin. Another one twisted the
entire rudder assembly some five de-
grees out of alignment. It was a tribute
to CUBMARINE’s rugged design that

no diving time was lost due to damage.

593

No matter what damage occurred, the
crew managed to have her ready to go
by diving time the next day.”’ (3)

From the very beginning—as John Barrin-
ger’s description of PC-3B’s Spanish opera-
tion testifies—the air-sea interface proved as
hostile as the great depths. Indeed, once the
more obvious problems of deep submergence
were overcome, the apparently simpler tasks
of transporting the submersible to, and
launch/retrieval at, the dive site proved to be
and remains a major limiting factor.

Few published reports deal directly with
launch/retrieval, although past and present
inadequacies are readily acknowledged
within the submersible community. In 1967
Mr. D. B. Usry, Jr., of Westinghouse compiled
A Survey of Launch-Recovery Concepts &
Systems for DEEPSTAR Vehicles which sum-
marized the various approaches and con-
cepts relative to at-sea handling of submers-
ible craft. This report was not published, and
it is unfortunate because it is an excellent
summary of the state-of-the-art and the re-
quirements of a successful launch/retrieval
system. Mr. Usry has made this report avail-
able and a great number of his observations
and data are included herein.

C. W. Bascom (4) described typical support
ships and handling systems for vehicles oper-
ational in 1968. Bascom’s report is one of the
first, if not the only, published attempt to
summarize what was then being used and
the many factors involved in at-sea submers-
ible deployment. Bascom also presents a
method of predicting dynamic loads on han-
dling equipment and breaks down the costs
of major subsystem acquisition and opera-
tion (Fig. 12.10 a&b). Bascom’s cost break-
downs reveal, what might be termed, en-
lightening aspects of a submersible program.
In short: Operating a submersible is no mean
financial feat. Bascom acknowledges that
these are rough approximations and, al-
though not stated, it is assumed represents a
large corporation’s (General Dynamics) ap-
proach, which can differ from the small in-
dustrial builder/operator. Nonetheless, the
conclusion, as any parent will agree, is ines-
capable: Creation of the progeny is the least
expense; it’s the care and raising that ex-
tracts a frightening toll.

VEHICLE
40%

HANDLING
SYSTEM
10%

SUPPORT
EQUIPMENT
10%

SUPPORT SHIP
40%

a RELATIVE COSTS OF ACQUISITION OF SMALL
VEHICLE WORK SYSTEMS

VEHICLE
28%

SUPPORT
EQUIPMENT
17%

SUPPORT SHIP
48%

b RELATIVE OPERATING COSTS OF SMALL
VEHICLE WORK SYSTEMS

Fig. 12.10 Cost percentages of submersible system acquisition and operation. [After Bascom (4)]

Doerschuk et al. (5) performed a detailed
analysis of over-the-side handling concepts
of the U.S. Navy’s Deep Dive System-MK 1
(DDS-1). The approach used was to evaluate
every feasible arrangement and to derive
one which included features of systems
which were not desirable in toto, but con-
tained individual features which were desir-
able to the final solution. The investigators
had one major advantage; the DDS-1 is al-
ways connected to its support craft by a lift
cable, submersibles are not, and attachment
of the lift cable is an evolution equal in
magnitude to the lift itself. Their analysis,
however, is directly applicable to submers-
ible launch/retrieval once the lift com-
mences. Indeed, these analyses were suffi-
ciently detailed and conclusive to prompt
Vickers Oceanics into selecting the stern-
mounted U-frame (with modifications) as
their method of launch/retrieval (6).

In 1969 the U.S. Navy’s Deep Submergence
Systems Project awarded a contract to the
Makai Range Ine. of Hawaii to perform at-
sea tests and evaluation of a system Makai
Range developed known as the Launch, Re-

594

covery and Transport (LRT) vehicle. The
LRT was a catamaran platform which could
submerge, hover and ascend to the surface.
The submersibles NEKTON ALPHA and
STAR II were launched and retrieved under-
water from the LRT as part of the test
program (7). Apparently impressed with the
potential of the LRT, the Navy proceeded to
construct the Launch and Recovery Plat-
form (LARP) in 1970 to handle MAKAKAI
and DEEP VIEW. LARP is essentially simi-
lar to the LRT, but differs in materials, air
transportability and an optional remote con-
trol feature. Subsequently, MAKAKATI and
the unmanned CURV III were deployed from
LARP and, while there were drawbacks, the
system demonstrated its practicality. Not a
great deal has been heard of LARP since
Estabrook and Horn’s report (8) which de-
scribes it and events leading to its develop-
ment, and with the laying up of the Navy’s
small submersibles MAKAKAI and DEEP
VIEW in 1973, it is assumed that nothing
further has occurred to improve or advance
this concept.

Because of the variety of submersible con-

figurations and operational capabilities, se-
lection of a launch/retrieval system is on an
individual basis. Some vehicles are so large
and heavy that it is impractical to consider
lifting them out of the water after each dive;
others, although smaller, are sufficiently
large so that the only feasible method is to
employ a cradle as with DEEP QUEST or
ALVIN. With the smaller vehicles a single
point attachment can be used, but protrud-
ing instruments or controls may require
some vehicles to lay off several feet from the
support platform, while others can come
quite close. In some submersibles the opera-
tor can work in concert with the support
platform’s Master to effect attachment and
retrieval; in others, the operator can do no
more than surface and wait for the support
crew to retrieve his vehicle.

Further constraints and considerations in
the choice of launch/retrieval systems arise
from the owner’s or user’s method of opera-
tion. For example, if the user owns the sub-
mersible’s support craft, then the launch/
retrieval apparatus can be permanently in-
stalled. If one uses a different platform for
different operations, then the launch/re-
trieval system must be air or truck trans-
portable, easily installed and require little,
or nothing, in the way of shipboard modifica-
tions. Such vehicle characteristics and opera-
tional procedures preclude an across-the-
board solution to launch/retrieval.

Possibly the greatest problems are derived
from the fact that the launch/retrieval sys-
tem, like the support platform, has not been
considered until after the submersible is de-
signed or constructed. In Doerschuk et al. (5)
several systems which showed promise had

to be abandoned because the procedure
might damage external instruments or com-
ponents on the DDS-1 by bringing its sides
into contact with a part of the retrieval
system. If the DDS-1 had been designed with
the launch/retrieval system in mind, such
protruberances might have been avoided or
protected in such a way as not to interfere
with the retrieving systems. But the real-life
situation is generally the opposite and one
must devise a system that does not jeopard-
ize the existing vehicle.

Usry’s report summarizes parameters
which he evolved in seeking a solution to
DEEPSTAR’s handling system; these are
presented in Table 12.3. It should be noted
that these parameters reflect a system that
will be used on different platforms and in the
open sea. A list of system elements (Table
12.4) represents factors concerning the vehi-
cle, the platform, personnel and safety which
must be considered in relation to the launch/
retrieval system; this table was also taken,
in part, from Usry’s report and is included to
show the many design and operational as-
pects one must satisfy.

The major adversary to any launch/re-
trieval system is the state of the sea. Mr. F.
Willet of Westinghouse has made the follow-
ing calculations which illustrate the prob-
lem. Presume an 8-foot-high wave of 5.4-
second period and 102-foot length. This short
wavelength will move the stern of the vessel
and the submersible in relation to each
other. The stern will plunge as the submers-
ible is on the crest and heave as the sub-
mersible is in the trough. With their cycle of
motion about 90 degrees out of phase and
assuming an 8-foot submersible vertical mo-

TABLE 12.3 SELECTION PARAMETERS FOR HANDLING CONCEPTS

—transportable by air or truck

—maximum safety and reliability

—easy installation on variety of
ships and platforms

—back-up provisions

—smooth, positive control

—rapid hoist from water

—operate in variety of sea states
reducing relative motion effects

—operated without extensive training

—accommodate variety of vehicles
—simple design, standard parts
—reasonable cost
—no additional personnel required
—no positive action required
of vehicle being recovered
—not require swimmers for critical
attachments or maneuvers
—utilize minimum deck space

—require no modification to

mounting platform or ship
—minimum maintenance and equipment
—no inhibiting effect on vehicle design
—reduce need for critical skills on

part of ship operator
—minimize handling effects on vehicle
—useful for other equipment

handling
—power source requirements

395

TABLE 12.4 DETAILED SYSTEM ELEMENTS

Safety Platform
Certification requirements Platform Behavior Sea-keeping behavior Electrical power available
Operator training Tests and Maintenance Maneuverability Configuration
Back-up systems Reliability Deck space Operating personnel
Vehicle capability Casualty Analysis Freeboard Length, beam and draft
Construction criteria Affect on Platform Ballasting and stability Deck reinforcement
Operating Area

Vehicle Personnel
Size Attachment points Manpower profiles Insurance
Weight Special attachments System complexity Special training
Configuration Vehicle behavior in water Maintenance Human factors in design
In-air trim Visibility

tion and 10-foot ship motion (both 5.4-second
periods), this will create a maximum relative
velocity of 8 to 9 feet/second. Furthermore,
when the submersible is out of the water and
supported by the handling system, rolling,
pitching and heaving of the ship imparts an
unpredictable motion to the submersible
which consequently must be restrained.

The following pages describe approaches
various groups have taken to surmount the
air-sea interface. The only method which
seems to avoid all compromises and offers a
solution to all vehicles is to launch and re-
trieve underwater from a support subma-
rine; the DSRV has done just this using the
attack submarine HAWKSBILL. Attack sub-
marines start at about $180 million. Un-
doubtedly privately-owned surface-oriented
support systems will dominate for some time
to come.

Methods In Use

Following is a brief summary of the proce-
dures followed during launch/retrieval with
the systems shown in Figures 12.11 through
23s

Non-Articulated Boom (Fig. 12.11): Several
submersibles use this system; the main prob-
lems are overcoming pendulum motion and
detaching/attaching the lifting hook. The
STAR III system employs a 12-ton, non-artic-
ulated boom for lift and three small tugging
winches to steady the submersible. When the
submersible is in the water, divers release
the steadying lines (4 points) and the lift
lines (4 points). Retrieval is more difficult

596

than launch owing to diver attachment of
the lines on a generally rolling, pitching and
slippery submersible and especially when the
attachment of the lift bridle demands ex-
treme alertness on the part of the divers to
avoid being hit by the swinging, heavy lift
hook. Coordination of the four winch opera-
tors places an additional burden on the oper-
ation. At times, in moderate sea states (up to
3), the pendulum effect is sufficient to wrap
the lift hook around the boom in preparation
for lifting, thereby causing additional delays.
The submersible pilot’s only function in this
operation is to maneuver his vehicle as near
to the ship as safety allows.

Articulated Boom (Fig. 12.11): The DEEP-
STAR 4000 system employs a modified
Koehring, articulated crane with a lift capac-
ity of 25 tons. Because the boom end is closer
to the submersible there is less pendulum
motion. A winch operator and two man-con-
trolled steadying lines are involved when the
vehicle is in air. When placed in the water
(DEEPSTAR is negatively buoyant) the lift
hook is tripped, but the vehicle remains teth-
ered by a line to the ship which a diver
releases after performing pre-dive checkouts
underwater. Retrieval involves swimming a
line out to the surfaced submersible and,
after attachment, hauling the vehicle close
enough to the ship to connect the lift hook.
Placement of the submersible in its onboard
cradle is expedited by a pneumatic skirt on
the cradle which inflates to join with the
vehicle. The pilot’s role during the entire
operation is passive.

ee

Non-articulated Boom Articulated Boom

Articulated Boom Overhead Rail

Fig. 12.11 Launch/retrieval systems

597

A modification of this system is employed
with the JOHNSON SEA LINK (Fig. 12.11)
where a universal joint is rigidly coupled to
the armtip. A diver is required to attach bow
and stern steadying lines and to insert a
special hooking device into a housing atop
the submersible. The pilot’s role is to maneu-
ver the submersible to a convenient point
astern of the ship. The entire procedure is
performed underway at low speed and expe-
dited by the fact that the boom need only be
retracted or extended along the fore and aft
line of the ship. In other boom systems the
vehicle pad location requires swinging the
crane through the ship’s roll plane.

Overhead Rail (Fig. 12.11): The DOWB and
NEKTON use an overhead fixed rail system.

The pendulum effect can be substantial in
this case with the added requirement for
greater maneuvering by both the ship and
the submersible because of the untrainable
nature of the rail.

Ramp (Fig. 12.12): International Hydrody-
namic’s HUDSON HANDLER is the only sup-
port platform known to use this system. The
following description of its launch/retrieval
procedure is taken from McFarlane and
Trice (9).

“One module of the vessel is hinged

along its foremost transverse, the

hinge point being almost exactly mid-

way between the vessel’s stem and

stern. The module is watertight and
contains internal subdivisions. When

Fig. 12.12 Hinged ramp of HYCO’s HUDSON HANDLER.

598

Docking Well Lift

Catamaran-Submersible Surfaced

599

DSRV MATED DSRV IN SERVICING ) DSRV POSITIONED ON
WITH DDC POSITION LIFT PLATFO&M

Stern-Mounted A-Frame

600

filled with air its deck line is horizon-
tal and co-planar with the deck level
of the vessel. When partially flooded
the stern end sinks some 17 degrees
leading into the water. The deck is
fitted with rails and a carriage into
which the skids of PISCES III fit. The
carriage is moved along the rails by a
winch and drag line arrangement.
When the submersible is on board the
support vessel, the carriage is fully
forward and locked rigidly in place.
To launch the submersible, sufficient
water is allowed to flood into the
ramp section to submerge its stern end
some ten feet below the surface.

The carriage is allowed to run aft
until the submersible floats free. To
recover, a line is used to haul the
submersible into the carriage which is
then drawn fully forward. The water is
blown out of the ramp section which
then returns to the horizontal.

The stern end of the ramp section is
restrained by shock absorbing preven-
ters which, while protecting the ramp
from damage, permit it to synchronize
relatively well with prevailing wave
action. Recoveries in seas with wave
amplitudes of up to 3.5 meters have
been accomplished.”’

Docking Well Lift (Fig. 12.12): The only
submersible which routinely employs a well
lift or LSD-type concept for launch/retrieval
is the U.S. Navy’s TRIESTE II. The system
is simple in concept but complex in practice.
The support ship WHITESANDS floods down
(25 feet is maximum for ARD-12) to a depth
where TRIESTE II is afloat; prior to this 11
restraining lines are attached. One is a bow
line which later serves as a tow line. Four
lines on each side are passed aft as the
vehicle exits the WHITESANDS, and two
lines are held by two handling boats which
pull TRIESTE II out of the well. The bathy-
scaph cannot use its own power because it is
completely deballasted of gasoline and shot
for launch and retrieval; this condition puts
all propellers above the waterline. As a gen-
eral operating procedure, if the prevailing
wavelength is shorter than the length of the
WHITESANDS no launching is conducted un-

601

til either the wavelength increases or the sea
calms. The WHITESANDS has no propulsion
power and is towed by the USS APACHE
(ATF-67).

Catamaran-Submersible Surfaced (Fig.
12.12): ALVIN’s launch/retrieval system uses
this approach. It differs from the DSRV cata-
maran system in that the DSRV mates with
its lifting cradle while submerged; ALVIN
mates while surfaced. During launch LULU
is laying to with her bow into the sea, ALVIN
is then lowered between the hulls on LULU’s
cable-suspended cradle until it is floating
and the cradle is brought to rest some 8 feet
below ALVIN’s skegs. Six steadying lines,
three on each side, are passed aft as ALVIN
clears the catamaran. Divers aboard the sub-
mersible are used to cast off lines and con-
duct pre-dive checks. Retrieval is accom-
plished in the reverse fashion with ALVIN
maneuvering into the catamaran. The opera-
tor standing in the submersible’s sail directs
the entire launch/retrieval operation. Clear-
ance between ALVIN and the hulls is about
4.5 feet on each side, which constitutes the
major hazard when sea state is high.
Launch/retrieval has been conducted up to
sea state 4.

Catamaran-Submersible Submerged (Fig.
12.12): Though it has not been field tested at
present, the DSRVs can be launched/re-
trieved on the surface in an ALVIN-like fash-
ion or retrieved below the surface. For sub-
surface retrieval the catamaran lowers the
cradle approximately 100 feet below the sur-
face and, through the use of guide arms and
a television system on the platform, the
DSRV positions itself on the cradle and is
hoisted to the surface. The purpose here is to
avoid the problems associated with sea state.
Subsurface launch and recovery in sea state
3 is considered possible.

Open Stern Well (Fig. 12.13): This system
is employed by Lockheed’s DEEP QUEST
and is similar to the ALVIN catamaran pro-
cedure. Within the 62-foot-long, 25-foot-wide
open well is a hydraulically-powered elevator
platform, 28 feet long and 23 feet wide, capa-
ble of lifting 60 long tons. Two handling lines
are attached on each side to assure that the
submersible does not collide with the sides of
the well or the forward bulkhead. Unlike

Submarine

Stern A-Frame
Fig. 12.13 Launch/retrieval systems.

602

Open Stern Well

603

ALVIN, a bow line assists the submersible in
and out of the well. Rubber fenders line each
side of the stern well for additional protec-
tion, and a net spans the forward end of the
well to protect the bow against collision with
the forward bulkhead. During launch,
TRANSQUEST maintains slight headway
and DEEP QUEST is essentially paid out of
the well; during retrieval TRANSQUEST pro-
ceeds at 1 to 2 knots into the sea and the bow
line is used to haul the submersible into the
well. With assistance from the line handlers
and the submersible’s pilots, it is eased into a
position where the cradle (6.5 ft below the
keel) can begin to lift. TRANSQUEST is de-
signed with four ballast tanks, port and star-
board, which permit draft changes from 6.5
to 10 feet to facilitate launch/retrieval.

Submarine (Fig. 12.13): Specially modified
nuclear submarines can be used for sub-
merged launch and recovery of the U.S.
Navy’s DSRVs. The DSRV is placed on the
submarine’s after rescue hatch at the pier
and can be transported at a submerged
speed of 15 knots. At the launch site it is
unlocked from within the mother submarine
to conduct its mission. A transponder on the
mother submarine is used by the DSRV to
locate it for docking. Reflective paint marks
obstructions on the submarine and high-
lights mating areas and guide lights on indi-
vidual pylons. External television on the
DSRV is used to monitor final approach and
tie down. With the DSRV secured to the after
hatch, ballast and life support replenish-
ment, battery charging and other servicing
and minor repairs can be conducted under-
water or on the surface. This system is not
restricted by sea state.

Submerged Platform (Fig. 12.13): To avoid
the turbulence of the surface, the Naval
Undersea Center has constructed and tested
a towed, underwater, launch/retrieval plat-
form called LARP (Launch and Recovery
Platform). LARP is a catamaran structure
consisting of two compartmental cylindrical
fiberglass hulls cross-connected by four alu-
minum pipes; the latter are overlayed by an
aluminum grating with appropriate cutouts
for controls, etc. Three fiberglass-covered ur-
ethane blocks provide buoyancy and stability
and house 12 each 200-cubic-foot-capacity

604

compressed air bottles which serve to debal-
last the hull. Forward on the platform are
remote and manual valves for controlling
buoyancy. The platform is presently capable
of lifting 10 tons and is 35 feet long, 18 feet
wide, 7 feet high and weighs 8.5 tons in air.

During tests LARP was towed with a sub-
mersible (MAKAKAI) aboard. Reaching the
dive site the tow ship layed to, and four
divers flooded the main ballast compart-
ments and, subsequently, the variable bal-
last tanks. At 60 to 70 feet deep LARP was
made to “hover” by control of the variable
ballast tanks. The submersible’s tie-downs
were released by the divers, and the vehicle
“flew” off the platform which was then sur-
faced. Retrieval involved the reverse proce-
dure. Remote control of LARP’s ballasting/
deballasting was possible, but remote control
of the tie-downs was not.

A further refinement to LARP (in experi-
mental design) is BALARE (Buoyancy Ac-
tuated Launch and Retrieval Elevator) in
which a similar platform is attached by two
pivoting, telescoping arms to the stern of the
support ship. The hydraulically-operated
arms bring the platform close to the support
vessel where maintenance/repair can be ef-
fected without the use of divers and where
the platform, because it is firmly held, as-
sumes the same motion as the support ship.

Stern-Mounted A-Frame (Fig. 12.13): Vick-
ers Oceanics employs this system to launch/
retrieve their PISCES series vehicles from
aboard the support ship VICKERS VOY-
AGER. Basically the system works as fol-
lows: To retrieve, a line is attached by divers
to the vehicle’s stern which is used to draw it
within hook-up range of a 6-inch wire rope
attached by divers to a lift padeye aft of the
sail. The lift rope is fairleaded through the
apex of the frame and the arm or pendant
and is wound about a specially-developed
compensating winch which always keeps the
rope taut. With the submersible drawn up to
the pendant, the pendulum effect is slight
and the vehicle is drawn stern-first onto the
support craft. Rotation of the submersible in
the horizontal is checked by steadying lines
attached port and starboard. According to
Goudge (6) a 12-ton submersible has been
recovered in 14-foot seas and larger swells;

the most important feature of this system is A variation on this theme is shown in

the compensating winch, which ensures that Figure 12.14 which Taylor Divers uses with
the lift line will never become slack and TS-1. Identical in operation to PISCES’s han-
create massive loads due to wave action. dling system, the departure comes in the

Fig. 12.14 Taylor Diver's hopes to avoid the use of swimmers by stationing an individual in the platform at the base of the pendant to hook up a hauser for retrieval

605

method of attaching the lift line. Encompass-
ing the end of the pendant is a platform on
which a person stands and manually lowers
and attaches the lift line to the submersible
directly below. When the attachment is made
the submersible is reeled in taut against the
pendant and retrieval proceeds as with the
PISCES vehicles. The point of this approach
is to eliminate the need for putting a person
in the water.

Conceptual Launch/Retrieval
Methods

Owing to the significant obstacle the sea
surface presents to submersible operations,
many approaches to launch/retrieval have
been conceived. While none of these systems
are as desirable as the mother submarine
concept, they are within the financial grasp
of submersible operators and, because of the
importance of the problem, they are cata-
logued here to acquaint the reader with the
many options for handling heavy loads at
sea. Whereas the diagrams are generally

N-HAUL WINCH

VEHICLE READY FOR LIFT

STEPS TO PREVENT OUTER

STRUCTURE FROM PIVOTING

DOWN. FREE TO ARC UP

WITH WAVE MOTION & VEHICLE

BUOYANCY.

self-explanatory, aspects of system pros and
cons are briefly discussed.

Elevator (Fig. 12.15): Designed by F. Willet
(Westinghouse), the system has the advan-
tage of requiring small deck space and of
being adaptable to ships of high freeboard.
Disadvantages are in the need to use divers
in a dangerous area (ship’s wake) and in a
high degree of maintenance to the many
cables and pulleys.

Floating Dock (Fig. 12.16): Designed by
A. P. Ianuzzi (Westinghouse), the system
provides protection to the submersible, but
the ‘‘moment of truth” (connection of ship to
vehicle) at the interface still exists. Studies
by A. Vine (Woods Hole Oceanographic Insti-
tution) show the ‘‘wheel concept” to be appli-
cable to the retrieval of moderate loads (life-
boats, buoys) aboard ship by attaching shock
absorbing aircraft wheels to the load itself.

Stern Crane-Ways (Fig. 12.17): An AMF
Corporation concept envisions mating the
submersible rigidly to a lift carriage which is
then winched up the craneways and aboard
ship. Mating the submersible to the carriage

41 DIVERS ATTACH DOWNHAUL LINES

AFTER TOWING LINE BRINGS
VEHICLE OVER TROLLEY.

DIVER OPERATES
DOWNHAUL WINCH AND
VEHICLE LOCKS INTO
CRADLE/TROLLEY,
OVERCOMING VEHICLE
BUOYANCY.

Fig. 12.15 Elevator concept. (F. Willet, Westinghouse)

606

LOW PRESSURE
AIRCRAFT OR

E
AUTOMOTIVE WHEELS Ce ae

BY TWIN SCREWS
POWERED BY DIESEL

CREW CABINS

HEAVY
LIFEBOAT
DAVIT

SHIP HULL

Fig. 12.16 Floating dock concept. (A.P. lanuzzi, Westinghouse)

607

ARTICULATED
CRANEWAYS

SE
;

PONTOON

TWIN-SPOOL WINCH

Fig. 12.17 Stern crane-ways concept. (AMF)

appears to be the critical operation in this
concept and would likely involve use of di-
vers.

Drawbridge (Fig. 12.18): Also designed by
A. P. Ianuzzi, the drawbridge system has
advantages and disadvantages similar to the
AMF and U-frame concepts.

Stiff-Leg Boom (Fig. 12.19): One of the
most readily available and simple concepts
for lifting objects at sea, the stiff-lezg boom
suffers from all the problems associated with
such activities: Pendulum effect, handling
when the vehicle is in the air and differential
motion between lift device and submersible.

Constant Tension System (Fig. 12.20): This
was designed by J. T. Leiby (10) to eliminate
shock loading on both submersible and lift
device, while at the same time controlling
pendulum motion. The constant tension de-
vice limits the load on the hook to 1.5 times
the rated load. A motion restraining device
permits vertical heave but restrains horizon-
tal motion. A light ‘‘tag’”’ line (nylon) is
hooked to the submersible from the ship and
the main hook-up (lift) connection is made
under constant tension using the tag line as
a guide. When lift is started, the constant
tension feature is locked in payout mode but
still provides pay-in (overhauling) if the vehi-
cle should rise faster than hoisting speed.

608

Design of the pendulum motion restraining
device was not discussed by Leiby.

Telescoping Boom (Fig. 12.21): The disad-
vantages of this approach are as follows: In-
haul lines are required to guide the vehicle
into hook-in position and, in addition, modifi-
cation of the lifting points is required. A
shock absorber on the grapple is designed to
overcome differences in vertical motion be-
tween vehicle and crane tip.

Hinged Ramp (Fig. 12.22): Proposed by R.
Gaul and R. Bradley (Westinghouse), the
hinged ramp system seeks to mate the sub-
mersible to a submerged, slanting platform
which heaves and plunges in concert with
the surfaced submersible. Once the submers-
ible is on the ramp, it is winched aboard;
during the course of recovery, the roll, heave
and mass force of the submersible are gradu-
ally transferred to the ship. The ball-in-
socket joint de-couples roll between ship and
ramp, and hydraulic ramps act first as shock
absorbers and subsequently as vertical sup-
port when the submersible is drawn out of
the water. Movement up the ramp may be
over skids or rollers on the submersible (re-
quiring attachment of the heaving cable by
divers) or on a specially designed mobile
platform to which the submersible mates.

The following launch/retrieval concepts

CRADLE
OUTBOARD SECTION FOR SUB
RETRACTS UNTIL
FLUSH WITH HULL

HEAVY SPROCKET CHAIN

ARCH MAINTAINS
VERTICAL POSITION
AS UNIT LIFTS

HULL
PRESSURE
PADS

FLOATS

PNEUMATIC FENDERS
REQUIRED IN
SUB DOCK SPACE

Fi

g. 12.18 Drawbridge concept (A.P. lanuzzi, Westinghouse)

DROGUE

Fig. 12.19 Stiff-leg boom.

609

DAMPENER

STAND-OFF DEVICE
PROVIDING PENDULUM
DAMPENING

MAIN DECK HYDRAULIC ROTATOR

J—=— FENDER

a TALVIN
PNEUMATIC
FENDER PARTIALLY
FILLED WITH
WATER

Fig. 12.20 Constant tension system. [From Ref. (10)]

ROTATION MOTOR

GRADALL

FITTING ON HULL

ROTATION 150°

Fig. 12.21 Telescoping boom.

610

BALL-IN-SOCKET

FLOATS JOINT

RAMP
(TWO SECTIONS FOR

VEHICLE SLED

RETRACTABLE

VARIABLE
FORCE
RAMS

RETRACTION AND STOWAGE)

GUIDE SHEAVE

DRAW WINCH

Fig. 12.22 Hinged ramp concept. (Proposed by R. Gaul and R. Bradley, Westinghouse)

Fig. 12.23 Spar buoy with trolley.

and the accompanying discussion of their
pros and cons are taken from Doerschuk et
al. (5) who, as mentioned previously, per-
formed analyses of many different systems
for the U.S. Navy’s Personnel Transfer Cap-
sule (PTC).

Spar Buoy With Trolley (Fig. 12.23): This
system provides a gradual transition from
the underwater motion of the vehicle to the
motion of the ship. The spar-buoy end of the
trolley is stable, while the pinned end is fixed
relative to the ship. Deployment and recov-
ery of the vehicle takes place far out on the
arm next to the buoy. The vehicle travels to
and from this point above water by virtue of
an electric or hydraulic trolley. Using a 5-
foot-diameter spar buoy, recovery of a vehi-
cle from the water would cause a 20-foot drop
in the spar-buoy’s vertical position (total
weight of vehicle, buoy and arm equals 12.5

tons). A major drawback with this concept is
sheer magnitude. Transportability, stowage,
and deployment of a buoy at least 5 feet in
diameter and long enough to attenuate the
maximum waveheight would pose severe
problems.

Inflatable Ramp (Fig. 12.24): In this con-
cept an inflatable rubber ramp is suspended
over the side of the ship. The vehicle is
lowered and raised using the ramp as a guide
and the ship’s boom as support. Stowage and
weight problems would be practically nonex-
istent. However, the idea may be too simplis-
tic in that the configuration of the vehicle
may not lend itself to be easily guided by a
simple ramp. Vertical orientation may be
difficult to maintain, and fragile exterior
equipment would be prone to damage.

Centerwell (Fig. 12.25): Deployment and re-
covery through a hole in the ship near the

Fig. 12.24 Inflatable ramp.

Fig. 12.25 Centerwell

612

Fig. 12.26 Guiding chute.

intersection of the roll and pitch axes may
greatly reduce undesired motion. However,
this feature is rarely available on ships of
opportunity.

Guiding Chute (Fig. 12.26): In this concept,
a cage acting as a guiding chute is deployed
over the side of the ship. The vehicle is
raised and lowered through it using a series
of guide shoes attached to the vehicle. Lift is
provided by the ship’s boom. The probability
of dangerous impact loads between vehicle
and cage as the vehicle is first drawn into
the chute during recovery makes this con-
cept unfeasible.

613

Balloon Assist (Fig. 12.27): The Balloon As-
sist is a variation on the “‘gradual change to
ship-motion” theme. Recovery and deploy-
ment take place from a winch riding the
tether of a relatively stable balloon towed by
the ship. Once the PTC is pulled completely
out of the water during recovery, the winch
is wound down onto the ship and the PTC is
secured. Major drawbacks are the possibili-
ties of wind direction change, requirement of
at least 315,000 SCF (in the case of the PTC)
of helium for the balloon, and the balloon
handling, maintenance, and manning prob-
lems.

Fig. 12.27 Balloon assist.

Quick Snatch (Fig. 12.28): This concept
employs a shock-absorbing collar such that
the vehicle can be quickly removed from the
sea. As the vehicle passes thru the air-sea
interface it contacts the absorbing collar
which is attached to an arm that moves
upwards to a restraint. The pivot of the arm
is set on a rotating table that allows the
entire package to rotate the vehicle over a
stowage point.

Telescoping Cylinder (Fig. 12.29): This con-
cept employs a hydraulic cylinder with two
modes of operation—normal push-pull power
and damping, controlled by variable orifices.
The lift cable leads through an attachment
at the end of the cylinder that provides auto-
matic latching. The cylinder is powered
about its horizontal axis by a rotary actuator
or gears, with the entire unit on a turntable.

Deployment commences by positioning the
attachment on the cylinder end over the
vehicle which is in a stowage position.
Hookup is made and the vehicle is moved
overboard and into the water. At some point
below the surface the hookup is released and
the vehicle is lowered. Recovery commences
by pulling the lift-cable in until the vehicle
latches onto the attachment device, at which
time the cylinder is in its damping mode,
preventing undesired ship motion from re-
sulting in damaging dynamic loads. Once the
vehicle is attached the cylinder is switched

614

Fig. 12.28 Quick snatch.

to power mode and the vehicle is raised from
the sea and set on deck.

The major problem with the dual-mode
telescoping cylinder, in the case of the 10-ton
PTC, is the bending stress induced when it is
extended and carrying the weight of the

f

=

Fig. 12.29 Telescoping cylinder.

PTC. The moment arm would be at least 15
feet, which would mean bending moments of
15 feet x 20,000 pounds or 300,000 foot-
pounds. Design of a cylinder to handle such
loads would be difficult. This concept was
considered unfeasible for the PTC.

Rope-Net Catch (Fig. 12.30): The simplest
concept in which the principle of pulling the
vehicle snug against a member fixed relative
to the ship manifested itself in the rope-net
catch concept. Two or three outriggers are
used to lay a large rope net on the ocean
surface. A strength cable is then threaded
through the center of the net and used to
pull the vehicle up. Once caught in the net,
the weight of the outriggers keeps a taut
downward pull on the vehicle and prevents
undesired motion as the vehicle is removed
from the sea. The strength cable is reeved
through a sheave on the ship’s boom.

The major problem with this concept is the
inherent untidiness and unpredictability of
the net. Also, fragile appendages on the vehi-
cle could easily be damaged.

Fig. 12.30 Rope net catch.

The foregoing delineates the wide variety
of methods and concepts available to launch/
retrieve a submersible at sea.

It would be tidy to say that system ‘“‘X”’ is
the best and therefore recommended over all
others. But, as we have seen, the variety in
submersible weights, dimensions and config-
urations is myriad, and what might work for
one will not work for another. Doerschuk et
al. found that no one concept was right for
handling the PTC and they proceeded to take
the most desirable features of several and
combine them, as was feasible, into a suita-
ble system. This procedure might well be the
best solution to present and future handling
problems. But no matter what the selection
procedure is based upon, one should not ex-
pect an ultimate arrangement; because the
sea has a whimsical personality and, as Usry
concluded: “There will always be an element
of danger when handling such loads at sea
and no computer is going to suddenly reveal
a shining solution free of compromises.”

LIFT HOOKS

Though seemingly a simple problem, the
selection of lift hooks is of extreme impor-
tance and—as demonstrated by DS-4000’s
helicopter hook failure with pilot and crew
aboard and a consequent 8-foot drop—it can
be a critical choice. The proper selection calls
for a hook that is quickly and easily attached
for lifting and will not jump out of its re-
straint as the submersible is lifted or jerked
about. For launching, the requirements are
that it will not fail or release accidentally
and can be quickly released when desired.

Pelican Hook (Fig. 12.31): This type of hook
is in general use. It is cheap, rugged and
quick to attach. Problems can arise, however,
when the vehicle and support craft are in
dissimilar motion, and it is sometimes quite
difficult to obtain sufficient slack to hook up.
Further, a diver is required to detach the
hook, and, as the submersible is wet and
slippery, the diver must hold on with one
hand, detach the hook and then avoid its
wild swinging until it is lifted clear. It can be
a difficult proposition.

U.S. Navy Safety Hook (Fig. 12.32): This
hook has been adapted for use by the DEEP-
STAR series of submersibles. It has been
tested to 44 tons and cannot be opened as

Fig. 12.31 A pelican hook on the lift bridle of STAR /I/. (NAVOCEANO)

long as 500 to 800 pounds of load are on the
hook. It provides positive visual identifica-
tion in the locked condition and a guide line
is led by hand into the submersible’s lifting
ring, which is fairleaded back to the ship for
closure. During launch a release lanyard is
triggered from the ship at an appropriate
time, thereby negating the use of divers.
The Link Hook (Fig. 12.33): Built into the
lifting structure of the LINK-designed sub-
mersibles (DEEP DIVER, SEA LINK and
others) is a housing into which an inverted
“T” shaped device, with a circular base, is
inserted. The edge of the circular base is
designed such that once the device is in-
serted and twisted it cannot be freed until
twisted back to the original position, thereby
avoiding inadvertent release. A further re-

616

Fig. 12.32 U.S. Navy safety hook. (NAVOCEANO)

finement built into the JOHNSON SEA LINK
system is shown in Figure 12.34. The in-
verted “U” shaped arm termination fits over
a device on the vehicle’s topside and pro-
hibits it from rotating in the horizontal
plane once the submersible is snug against
the boom.

TOWING

Submersibles too large for at-sea launch/
retrieval and not having access to an LSD for
support, must be towed to distant dive sites.
There are several disadvantages to towing:
Towing speed is slow (5-6 knots maximum);
working on the pitching topside of a sub-
mersible is difficult and, at times, dangerous
(the Federal Civil Service regulations pro-

vide for hazardous duty pay when such work
is performed during sea state 5 or greater);
and work below the vehicle’s waterline must
be performed by divers which is dangerous
as well as time consuming and cumbersome.
In some instances external equipment instal-
lation can be performed in a sheltered an-
chorage and the submersible subsequently
towed to the dive site. If the sea is rough a
great deal of damage can be done to the
instruments and their electrical connectors
by wave slap during the tow. On the positive
side, towing gets the submersible to the job.

PERSONNEL AND SHORE
FACILITIES

Predictably, the larger the submersible,

we

Fig. 12.33 A lifting hook (already inserted into the lift housing) designed by Mr
Edwin Link. (NAVOCEANO)

the greater the number of and more special-
ized the personnel required for its mainte-
nance. In most instances the ship’s crew
bears a hand in launch and retrieval, al-
though they may not be considered part of
the submersible crew. Hence, it is difficult to
precisely define the submersible’s comple-
ment. When the submersible is brought
ashore for overhaul or repair, a similar iden-
tification problem occurs when individuals
with special talents are called in on a tempo-
rary or one-time basis. Consequently, the
personnel support listed (Table 12.5) is less
than minimal, but gives an appreciation of
the overall support required.

The numbers and types of support person-
nel required ashore to take care of logistics,
planning, documentation, certification or
classification and a wide variety of other

Fig. 12.34 The “index” bar in the foreground serves to restrain JOHNSON SEA
LINK from rotating in the horizontal plane

TECHDIVER (PC-3B)

STAR III

DEEPSTAR-4000

ALVIN

DEEP QUEST

TRIESTE II

TABLE 12.5 PERSONNEL SUPPORT AT SEA

(3)

(4)

(12)

(11)

(8)

(21)

Submersible’s
Crew

Operations Leader/Pilot
Pilot
Pilot/Tech

Pilot/Diver
Pilot/Maint. Eng/Diver
Pilot/Elec. Tech/Diver
Pilot

Operations Leader
Chief Pilot

Pilots (2)
Maintenance, Chief
Electrician (3)
Mechanic (3)
Service Asst.

Expedition Leader/Pilot
Pilots (2)

Crew Chief

Mechanic

Electrician

Materials Tech.
Instrument Supervisor
Instr. Technician (2)
Photographer Diver

Operations Leader
Chief Pilot

Pilot

Electrician (2)
Electronics Eng.

Hull & Life Support Eng.

Hydraulics Eng.

Officer in Charge
Operators (Pilots) (3)
Instr. Elec. Tech. (3)
Elec. Tech. (3)

Mach. Mates (4)
Boatswain’s Mate
Storekeeper

Yeoman

Shipfitter

Data Syst. Tech., Photographers Mate, Seaman

618

(3)

(7)

(7)

(7)

(9)

(100)

Support Ship’s
Crew

Master
1st Mate
Cook

Master

Chief Engineer
1st Mate
Seaman (2)
Cook

Cook’s Helper

Master

Chief Engineer
1st Mate
Seaman (2)
Cook

Cook's Helper

Master

Chief Engineer
Engineer
Navigator
Seaman

Cook
Steward

Master

Engineer

Cook

Steward

Ship Fitter

Deck Hands/Technician (4)

WHITESANDS Complement:
4 officers; 96 enlisted men

day-to-day duties depend on the complexity
of the vehicle and its support system. More
or less typical of the mid-range vehicles is
ALVIN, whose shore-based support personnel
are: A Quality Control Engineer, Chief
Draftsman, Draftsman, Secretary, Instru-
ment Engineer, Mechanical Engineer, Engi-
neering Technician and Structural Engineer.

The background of submersible operators
or pilots and support personnel is varied. By
and large, most pilots are ex-Navy personnel
with submarine experience, but this is not a
requirement; for example, of DEEPSTAR
4000’s four pilots, only one was an ex-sub-
mariner. Of the remaining three, one was a
naval aviator, one a civilian draftsman with
extensive scuba experience and one a civil-
ian diver/photographer. On the other hand,
DEEP QUEST’s submersible pilots and crew
are almost solidly of Naval background.

Versatility is one aspect common to all
backgrounds, for in many instances an engi-
neer or pilot may be required variously, to:
Don scuba tanks to inspect or help repair the
submersible, handle a line during the launch/
retrieval or bear a hand in loading supplies
on the support ship or submersible. In es-
sence, a member of a submersible’s support
crew must be specialist, generalist and ordi-
nary seaman, and the smaller the submers-
ible, the wider the range of individual duties.
There can be no prima donnas in a submers-
ible crew.

Facilities ashore to support the submers-
ible range from garage-size to hangar-size.
Within this range is a wide variety of capa-
bilities with none individually being repre-
sentative of the community in general.

Quite naturally, the more transportable
(smaller) the submersible, the farther away
from a dockyard or pier it may be. Submers-
ibles of the NEKTON class are trailer-trans-
ported to their shop. Large submersibles,
such as DEEP QUEST, are generally based
on the water front where a marine railway is
available to haul the vehicle to and from its
shop.

A submersible as large and sophisticated
as DEEP QUEST requires considerable
shore-based support. The San Diego, Cal.,
shore base includes a 165-foot pier, marine
railway (70-ton capacity), waterfront ramp
area and a building housing offices, shops,

619

equipment and maintenance area. The latter
includes electronics, electrical, hydraulic and
diver equipment shops.

On the other hand, SEA OTTER’s home
base is several blocks from the waterfront
and consists of one large room (shop) and a
small office.

The majority of submersible operations
have been conducted in temperate and tropi-
cal latitudes. Only a few have taken place in
the Arctic. The only problems unique to the
tropics are the obvious ones of heat and
humidity; for this reason an air conditioning
unit is used to blow air into the pressure hull
while the vehicle is being worked over
aboard its mother ship. When operating on
the surface or in shallow water the heat and
humidity can become unduly oppressive in a
very short time, for it is assisted by heat
generated by electric equipment in the pres-
sure sphere. Even so the tropics and sub-
tropics are far more benevolent than are the
high latitudes.

Arctic operations are controlled by
weather, temperature and ice. Diving under
an ice cover is risky business in a short-
duration submersible with no accurate and
reliable means of navigation and any num-
ber of potential failure areas. Hence, the
majority of such dives proceed with a line
attached to the vehicle to retrieve it in the
event of a breakdown or navigation error.
Obviously, the vehicle must be in a heated
shelter aboard ship in order to perform rou-
tine maintenance.

Most cold weather problems with submers-
ibles are predictable, but one that was not
was the O-ring viewport seals on DEEP DI-
VER working in the Aleutian Islands in 1972.
During each dive seawater would collect be-
tween the viewport and its metal insert and
freeze when DEEP DIVER was retrieved;
the O-ring would freeze solid on exposure to
the air. When the submersible was placed
back in the water the ice melted, but the O-
ring remained contracted and inflexible.
Consequently water leaked into the pressure
hull between the viewport and its housing.
This required retrieving the vehicle, remov-
ing each viewport and wiping the housing
dry. Subsequently the neoprene O-rings were
replaced with silicon O-rings which solved
the problem.

Supporting and maintaining a submersible
to dive on schedule is fraught with the poten-
tial for disappointment. The field of submers-
ible operations is still new and experience-
limited; hence, equipment failures and oper-
ational problems are inevitable. Even sur-
face ships, with hundreds of years of experi-
ence, regularly encounter the unexpected
and are forced to retire for repairs or devise
a new approach. So, it must be expected that,
with slightly more than a score of years’
total experience, submersible operations will
encounter the unpredictable for some time to
come. Figure 12.35 provides an insight into
some of the unpredictables with PISCES IIT;
similar tables can be expected from virtually
every other submersible operation.

REFERENCES

1. Sly, P. C. 1971 Submersible Operations
in Georgian Bay and Lake Erie—1970.
Tech. Bull. No. 44, Inland Waters
Branch, Dept. Energy, Mines and Re-
sources, Ottawa, Canada, 36 pp.

2. Hirano, Y. 1972 The Mother Ship of an
Undersea Research Vehicle. Preprints,
2nd International Ocean Dev. Conf., To-
kyo, v. 1, p. 757-769.

3. Barringer, J. L. 1967 CUBMARINE Oper-
ations in Spain. Geo-Marine Tech., v. 3,
n. 1, p. 12-18.

620

10.

. Bascom, C. W. 1970 Small Submersible

Support Systems. ASME Pub. 69-Unt-5, 8

pp.
. Doerschuk, D. C., Adkins, D. E. & Glas-

gow, J. S. 1970 Mark I Deep Dive System
(DDS-1) Handling Study Phase 1—Con-
ceptual Design. Summary Rept. to Naval
Ship Engineering Center, Contract No.
N-0014-70C-0072.

. Goudge, K. A. 1972 Operational Experi-

ence With PISCES-Submersibles. Conf.
Papers Oceanology International 72,
Brighton, England, p. 270-273.

. Makai Range Inc. 1970 A Method to Han-

dle Small Submersibles at Sea. Rept. to
U.S. Naval Undersea Research and De-
velopment Center, Contract No. N00123-
70-C-1842, 35 pp.

. Estabrook, N. B. & Horn, H. M. 1972

Stable platforms for the launch and
recovery of submersibles. 4th Ann. Off-
shore Tech. Conf., Houston, Texas, Paper
No. OTC1624, p. 77-86.

. McFarlane, J. R. & Trice, A. B. 1972 Core

Sampling in the Hudson Bay. Preprint
Offshore Tech. Conf., Houston, Texas
1972, Paper No. OTC1631, p. I1-169-II-
174.

Leiby, J. T. 1968 Constant Tension Sub-
mersibles Handling System. W.H.O.1.,
Ref. No. 68-34. (Unpub. Manuscript)

DOWN TIME DATE DIVE TIME

EORGI 6
APPROXIMATE TIME SCALE—H:
ot
LAC ERIE AN
= = Pe
REV
MERSIBLE
sai Keg
E ENT
E R SUBMERSIBLE ARRIVE
NTINUED AN t
En TE 10
JBMERSIBLE LAUNCHED IN LITTLE
11 TUB AND TEST DIVES MADE
°
TANK BUR
4 IL CLE
We =
E PLETE 13
T IVES IN BI 1B HARBOUF
EN )MERS DIVE
RECt iF E
GOLDSTEEN AND FREENER DIVE OFF
14 DOCTOR ISLAND AND BIG TUB
Lew F IVE OFF MI
ISLA
ING AND TASK FORCE
LITTLE DUNK’S BAY
NED TO BIG TUB
15 PR. DIVES IN BIG TUB HARBOUR
KEMP, ROE, SLY AND SANDILAND:
IVES IN BIG TUB
SUBMERSIBLE RECHARGING
TOW TO FLOWERPOT ISLAND, LEWIS
16 ) SANFORD DIVE. MOTOR
EZED, DIVE ABORTED LE
VJURED MAN TAKEN TO HOSPITAL
BY HELICOPTER DIVES IN BIG TUB BY RUKAVINA. ST
JACQUES, RODGERS. SIMPSON
JB RECHARGED AND TOWED TO A PORTER AND MUDROCHOVA
POSIT FF MIDDLE ISLAND
R AND LEE DIVE IN THE
17 M AND FLOWERPOT ISLAND
AND PREF LEAVE FOR E
ERIE
PER EL AND EQUIPME
R

N
[o>)

NEPSZY, LEACH AND COLEMAN
DIVES OFF PELEE ISLAND

LEWIS AND SLY. DIVES OFF PELEE

ISLAND

RECHARGING AND RETURNED T

PELEE LEWIS, TERASMAE AND SLY. DIVE

OFF POINT PELEE
ELLICOTT AND BLANCHARD. DIVE
OFF POINT PELEE

x

=

N
LD)

RESTRICTED DIVES BY BURNS AND.
OTHERS AT ERIEAU-BAD WEATHER

£5 ABORTED BECAUSE OF BA DIVES OFF PC
EATHER TASK FORCE PREPARE 23 BECAUSE OF \

TASK FORCE DISBANDED

T ALMA CANCELLE

Fig. 12.35 Summary of PISCES III's Operations. [From Ref. (1)]

621

CERTIFICATION, CLASSIFICATION,

REQUIREMENTS

Depending upon their use, there are and
there are not Federal legal requirements
covering construction, materials or operat-
ing licensing in the U.S. for manned sub-
mersibles. Submersibles which carry passen-
gers for transportation or recreational pur-
poses fall into a category wherein Federal
regulations are applicable. Prior to 1971 the
Motor Boat Act of 1940 encompassed the
only regulations for submersibles. In 1971
this act was rewritten and under its provi-
sions passenger-carrying and recreational
submersibles are covered. However, no sub-
mersibles now operating fall into a category
wherein the “‘passengers” are defined under
the Motor Boat Act of 1971; therefore vehi-
cles carrying scientists and engineers have

623

only minimal legal requirements to fulfill.
These, and others, are discussed more fully
under U.S. Coast Guard Requirements later
in this chapter. The U.S. Navy has its own
certification procedures, established in 1967,
for submersibles operating under their aegis
with Navy personnel aboard.

For the civilian sector, in 1968 the Ameri-
can Bureau of Shipping, in response to a
request made by the U.S. Navy and private
industry, organized a Special Committee on
Submersible Vehicles to deal with the prepa-
ration of regulations to govern commercial
submersibles. Due to the limited commercial
use and lack of ABS experience with sub-
mersibles, it was decided to publish a guide
manual instead of a specific rule book. The

Guide for the Classification of Manned Sub-
mersibles covers various governmental regu-
lations which owners, builders and designers
must keep in mind for safe operation and
licensing.

A number of attempts have been, and are
being made, to establish legal requirements
for the construction and operation of all sub-
mersibles. Table 13.1 lists these attempts,
and a copy of the latest (HR 8837) is shown in
Appendix II. In essence, these bills propose
to regulate the design, construction and op-
eration of the vehicle and the qualifications
of the operator, as well as to rate the ade-
quacy of schools offering instructions in ve-
hicle operations. In all cases but one (82145),
the U.S. Coast Guard is designated as the
regulatory body. The one exception would
give that authority to the National Oceanic
and Atmospheric Administration. Signifi-
cantly, no bill has yet been enacted into law.

Before dealing with requirements of Navy
certification or ABS classification, it would
seem appropriate to outline the case for legal
requirements. Private owners of submers-
ibles in the United States look with some
apprehension on proposed submersible
safety legislation because they feel the “Bu-
reaucrats” would subject their vehicles to
expensive and restrictive requirements
which would not only put them at a competi-
tive disadvantage internationally, but would
also stifle innovation. The proponents of leg-
islation (Table 13.1) feel that some sort of
safeguards, in addition to the builders’ good
intentions, should be a legal requirement to
protect the passengers.

It would appear that both groups are cor-
rect. The cost of certification as carried out

under U.S. Navy regulations can be expen-
sive if the procedures are initiated after the
submersible is constructed and in service. On
the other hand, costs would be least if the
certifying procedures ran concurrently with
design and construction. Mr. John Purcell of
the U.S. Naval Ships System Command
stated that anywhere between $5,000 and
$25,000 can be required to fund the efforts of
Navy’s certifying of personnel on one vehi-
cle, depending upon when the certifying pro-
cedure was started. This estimate does not
include the cost of any physical efforts on the
part of the owner, and, in all likelihood, the
total cost of Navy’s material certification
will be on the high side of this range. On the
other hand, without some safety governing
organization, the scientific and engineering
passengers in submersibles, who are largely
ignorant of submersible construction or oper-
ation, must place complete faith in the capa-
bilities of the designer, the builder and the
operator.

If we look at the present situation, how-
ever, it further appears that the submersible
industry is doing a good job of policing itself
despite the lack of any legal requirement to
do so.

A list of ABS-classified submersibles is
presented in Table 13.2. Accompanying these
are submersibles which have applied for clas-
sification, but, for reasons unconnected with
their design, have not yet received such. All
presently operating Navy submersibles (AL-
VIN, DSRV-1 & 2, SEA CLIFF, TURTLE,
TRIESTE II) and inactive Navy submers-
ibles (NEMO, MAKAKAI, DEEP VIEW) have
undergone Navy certification. The vehicles
which are not included in either category are

TABLE 13.1 PROPOSED SUBMERSIBLE LEGISLATION

Sponsor Bill Date Introduced

Congr. Rogers HR 16286 1968

HR 11282 1969
Congr. Lennon HR 15711 1968

HR 246 1969

HR 2484 1970
Congr. Downing HR 8837 1973

HR 8924
Sen. Hollings S 2145 1973

U.S. Coast Guard OMB 93-48

Congress Title
90th Manned Submersible Safety Act
91st Pe Hy - Ss
90th Submersible Vessel Safety Act
91st - z * oe
91st a n a oe
93rd Submersible Vessel Safety Act

(A reissue of HR 8837)

93rd Civilian Oceanographic Research
Facilities Act of 1973

Not yet introduced (Nov. 1973)

TABLE 13.2 SUBMERSIBLES CLASSIFIED BY THE AMERICAN
BUREAU OF SHIPPING

Classified Submitted for Classification
AQUARIUS | PC-1201 AUGUSTE PICCARD
BEAVER PC-1202 DEEP QUEST
BEN FRANKLIN PC-1401 DEEP STAR 20,000
DEEPSTAR 2000 PC-1402 SEA OTTER
GUPPY PISCES |, Il, Wl, IV, V, VII, VIEL, X SEA RANGER 450
JOHNSON SEA LINK I PS-2 PC-1203
K-250 (VAST MK II) SDL-1 PC-1204
NEKTON (BETA & GAMMA) SHELF DIVER PC-16
OPSUB TS-1 (PC-9) PISCES VI
PC-8B VOL-L1

vehicles which do not ordinarily seek to
carry occupants other than the operator(s).
In short, charterers of submersible services
can choose from a wide list of vehicles either
ABS-classified or Navy-certified.

At this point we shall leave the Naval
submersibles, which by Navy policy must
undergo and pass certification to operate,
and will deal with privately-owned vehicles.
In particular, let us address the question of
why’s and the benefits to owners and build-
ers of ABS classification.

Commander C. B. Glass, USCG, in a 1969
paper (1) described the U.S. Coast Guard’s
position on legal requirements for submers-
ibles (pro) and pointed out that industry
owners themselves (Refs. 2 and 3) saw the
following benefits from certification:

1. Reduction of insurance expenses.

2. Establishment of confidence/acceptance

by the customer.

3. Safety from an irresponsible few who
might endanger the economic and scien-
tific growth of submersible activity.

Personal communications with Dr. J. W.
Vernon, General Oceanographic Inc.; Mr. D.
Barnett, Perry Submarine Builders, Inc. and
Mr. M. Thompson, International Hydrody-
namics, Ltd., who collectively have built and
operated 20 manned submersibles, reveal
that there is no apparent reduction in insur-
ance policies after the vehicle has undergone
ABS classification. The only conceivable ad-
vantage, according to Dr. Vernon, is that it
(ABS Classification) might influence an in-
surance company to decide whether or not
they will cover the vehicle. This opinion is
shared by Mr. Barnett who further states

625

that, in his opinion, the insurance companies
have had insufficient experience in submers-
ible insuring and do not distinguish between
a classed or unclassed vehicle as far as the
size of the premium is concerned.

A benefit can be seen in classification re-
garding establishing confidence and accept-
ance on the customer’s part. Mr. Barnett
states that adherence to ABS classification
demonstrates that the vehicle is “built to a
standard” established by recognized authori-
ties in the field, and not merely those of the
builder. In the past several years ABS classi-
fication has become a requirement of several
non-military American Federal Agencies.
The submersible owner who wishes to lease
his vehicle to these agencies must produce
the required ABS documents, a benefit of
classification not mentioned by Commander
Glass.

ABS classification standards were drawn
up by representatives from the Navy, Coast
Guard, industry and academia. Commander
Glass states that except in special cases, the
Coast Guard now accepts—though not neces-
sarily “rubber-stamps’”—ABS classification
of surface vessels as proof of the adequacy of
structural design and expects that a similar
relationship will develop with submersibles.
One is therefore led to speculate why laws
are required, when the vast majority of vehi-
cle owners and users have voluntarily
adopted ABS classification as a prerequisite
to utilization.

Regarding the benefit of safeguarding
against ‘“‘. . . an irresponsible few,” it is suf-
ficient to note that since the operation of
Auguste Piccard’s FNRS-2 in 1948, over 100

submersibles have been built throughout the
world and have conducted thousands of dives
carrying over 30,000 people. In this 25-year
period there have been four fatalities in sub-
mersibles themselves and one submersible-
related fatality. It would seem that irrespon-
sibility is not a characteristic of this ungov-
erned industry.

POTENTIAL HAZARDS

“If everything has been done in ad-
vance, and no one makes a fool of him-
self, or forgets, a submarine is the safest
kind of boat to be in.”

—Simon Lake

Albeit a submarine is a safe boat to be in, but
Mr. Lake did not envision that it would be
lifted out of the water after each dive and
carry an agglomeration of equipment while
it poked its way into narrow canyons or
amongst a tangle of debris. Because it is a
component of a system, the submersible’s
occupants are as dependent upon a safe
launch/retrieval system as they are upon a
safe vehicle.

There are two general areas wherein po-
tential hazards exist; 1) the submersible sys-
tem, and 2) the environment in which it
operates. These two areas are grouped under
System Hazards and Environmental Haz-
ards, and the potentials for failure are dis-
cussed below.

System Hazards

Within this category fall Materials and
Sub-Systems, Instruments, Operators and
Launch/Retrieval Systems. Many of the po-
tential hazards which may befall the sub-
mersibles’ occupants are obvious; some are
not, and the possibility of more than one
occurring during the same dive is always
present and has occurred. The groupings be-
low are not presented in order of priority,
because, at the risk of being repetitious, the
submersible is part of a system and that
system, like the proverbial chain, is only as
strong as its weakest link.

Material and Sub-System Failures
Pressure Hull: Failure of the pressure hull
may occur within the vehicle’s operating

626

depth due to a design fault, incorrect mate-
rial selection or errors during fabrication
procedures.

Penetrations: Thru-hull penetrations are ad-
ditional areas where failure may occur. Elec-
trical penetrations are liable to overload con-
ditions which may completely burn away the
thru-hull conductor and open a conduit
through which water may enter the hull
(Fig. 13.1). Conversely, in a lock-out vehicle,
the sudden pressure drop created by the loss
of the conductor may be detrimental to the
occupants if they are decompressing at
higher-than-ambient pressures.

Emergency Deballasting: All submersibles have
some means of reducing weight in order to
surface when the normal procedures mal-
function and the possibility exists that these
emergency systems may also malfunction.

Entanglement: Various vehicle appurte-
nances, e.g., skids, motors, ballast tanks, may
protrude or be designed in such a fashion
that they are liable to entanglement in ca-
bles or ropes (Fig. 13.2).

Life Support Systems: Failure of a life support
system and its emergency backup system
can occur during a dive leaving insufficient
time to surface or, if unable to ascend, to

Fig. 13.1 A short circuit produced these burned penetrator housings on ALUMI-
NAUT. (NAVOCEANO)

Fig. 13.2 A “snaggable,” but jettisonable acoustic array on STAR Ili. (Gen. Dyn./
Elec. Boat)

support the occupants until help arrives. In
another vein, the devices used to monitor
oxygen and carbon dioxide may be faulty and
lead to incorrect decisions regarding internal
atmosphere or the remaining life support
duration.

Fire: The interior cabling of a submersible
may short circuit or overheat to a point
where combustion may occur and endanger
the occupants by burning or by evolution of
noxious gasses or fumes.

Propulsion: Where a vehicle’s mission may
require it to travel under ice, overhanging
ledges or under man-made structures, fail-
ure of the propulsion motors may make
emergency deballasting procedures impracti-
cal.

Instrument Failures

Within this group are failure or emergency
potentials created by the physical presence of
instruments external to the hull, and by the
failure of the instrument to operate. In the
first case are:

Entanglement: Instruments external to the
hull fairings are subject to entanglement
with ropes or cables.

627

Pressure-resistant instrument
housings may implode and create a shock
wave which renders inoperative other sys-
tems critical to the vehicle’s safety.

In the second instance are instrument fail-
ures which may render continued operations
hazardous; these are:

Depth Gages: The failure or inaccuracy of
depth gages may lead the operator to de-
scend below safe limits.

Obstacle Avoidance Sonar: This sonar is used to
warn the operator of distant (up to 1,500 yd)
obstacles. Failure of this sonar essentially
blinds the operator in limited visibility situa-
tions.

Underwater Telephone: Failure of the under-
water telephone opens the possibility of sur-
facing into or in the path of surface traffic
and, in a situation where the vehicle is una-
ble to surface, renders surface support vir-
tually helpless to respond.

Tracking Equipment: Loss of the submersible’s
position relative to the surface ship may
result in the vehicle surfacing some miles
from its support ship and essentially
becoming.adrift with slight chance of being
visually located, and, because of its low
superstructure, becoming susceptible to colli-
sion with oncoming surface crafts.

Corrosive/Radioactive Materials: Certain instru-
ments utilize radioactive materials (e.g., sed-
iment probes) or corrosive liquids (battery
electrolytes) which, if freed, could be harmful
to both personnel and vehicle.

Implosion:

Operator Failures

The operation of a submersible ranges
from simple to extremely complex, and the
training, knowledge and duties of the opera-
tors increase proportionally. On a vehicle of
the DEEP QUEST variety, the pre-dive re-
sponsibilities of the operator commence sev-
eral hours before the actual dive. Into this
scenario are introduced different missions
and equipments for each dive, and the need
for the operator to function in concert with
the support ship’s Master during launch/re-
trieval.

The operator must have a knowledge of
every aspect of the vehicle’s construction,
operation and handling capabilities, as well
as emergency procedures and instrument op-
erations. The operator’s panel on DEEP

QUEST (Fig. 13.3) or the DSRV’s, for exam-
ple, is as complex as that of a commercial
airliner, and the wide range of potential haz-
ards is equal in every respect to that facing
aircraft pilots.

The potential for failures which the opera-
tor may cause are legion, but they may be
attributed to one of several causes: Sickness,
inexperience, forgetfulness or error in judge-
ment. The first two can be controlled by
medical examinations and a rigorous train-
ing/testing program, respectively. The third
and fourth problems, forgetfulness and
judgement errors, can be controlled to some
degree by pre-dive check-lists and surface
advice, but in the final analysis it is con-

trolled by the operator himself. Fortunately,
the passengers’ desire for an operationally
routine dive is matched by that of the opera-
tor—as fail safe a system as is humanly
possible.
Launch/Retrieval Failures

The systems used to launch and retrieve
submersibles are subject not only to electri-
cal and mechanical failures, turbulent sur-
face conditions may also cause situations
wherein the system may be operational, but
unsafe, owing to the erratic differential mo-
tion between the submersible and its support
ship (Fig. 13.4).

Cables: The results of a cable or boom break-
ing during launch or retrieval are fairly ob-

Fig. 13.3 Control console of DEEP QUEST. (LMSC)

Fig. 13.4 In moderate seas the close quarters between LULU’s pontoons make line-handling and control of ALV/N an exacting task. (NAVOCEANO)

vious and may cause damage to the vehicle,
the occupants and the support ship as well.

Hydraulics: The most vulnerable moment
during launch/retrieval is when the submers-
ible is free of the deck or water and sus-
pended between the two. If, for example, the
hydraulically-powered lift system were to ex-
perience a failure which made it incapable of
lateral or vertical movement, and the sea
were running high, the pendulum motion of
the vehicle could be sufficient to cause great
damage to participants and components.

Collision: Present submersibles come within
a few feet of the support ship for attachment
of the lift device; at this point the danger of
collision, with its attendant damage, is cru-
cial.

629

Line-Entanglement In addition to the main
lifting cable, from two to six lighter restrain-
ing lines may be used to steady the submers-
ible. Personnel entanglement with such lines
is a possibility which may cause injury from
the line itself, or temporarily immobilize the
crew member, thereby putting him in a posi-
tion of considerable jeopardy if the vehicle is
plunging or swinging.

Divers Virtually all submersibles use divers
or swimmers to attach or detach lift and
steadying lines. Working between the sub-
mersible and ship, which may at times be
separated by only a few feet, the swimmer is
exposed to getting caught and crushed be-
tween both (Fig. 13.5). In addition, he is

liable to entanglement in the lines he is
responsible for clearing.

Environmental Hazards
Within this category are hazards external
to the submersible. These hazards include: 1)

Natural Hazards (weather, currents, bottom
sediment, topography, visibility, and orga-
nisms), and 2) Man-Made Hazards (cables,
wrecks, bottom hardware and buoyed arrays,
surface traffic, subsurface traffic and explo-
sive ordnance). A more detailed account of

Fig. 13.5 Divers attaching a salvage line to ALUMINAUTss bow. The hull of its support ship is in the background. (Robert Dill, NOAA)

630

environmental hazards and how they affect
submersible operations is presented in refer-
ence (4).

Natural Hazards

Weather: The effects of weather on sea state
and its influence on launch/retrieval are dis-
cussed in Chapter 12. A further problem
arises when waves higher than 4 or 5 feet
make visual sighting of submersibles ex-
tremely difficult owing to their low silhou-
ette. Although radio contact can be made,
homing on submersibles is accomplished visi-
bly and, in some instances, as much as 3 to 4
miles may separate support ship and sub-
mersible. This condition makes visible sight-
ing of a low silhouette vehicle almost impos-
sible. Deterioration of weather during the
dive may affect not only the subsequent re-
trieval of the submersible, but the transfer
of personnel to the support craft.

Currents: While the major ocean surface cur-
rents are generally known and their posi-
tions charted, little data exist concerning
near-bottom currents where the submersible
may be required to operate. Near-bottom
currents are variable in both direction and
speed over short periods of time, and they
are strongly affected by topography. Short-
term shifts in current speed and direction
are common and have caused severe opera-
tional problems in an area where less than
0.1 knot was observed at commencement of a
survey and over 3 knots were present at its
termination (5). Control of the low speed
submersible is almost impossible under such
conditions, and the problem of avoiding man-
made or natural hazards is magnified sub-
stantially.

Where extensive shallow water or enclosed
areas are situated adjacent to a deep ocean
area, a current may be generated by the
differences in water densities between shal-
low and deep areas.

An example is the Strait of Gibraltar
where water of greater density than contig-
uous Atlantic waters exits the strait due
west along the bottom and then descends to
a depth of over 3,000 feet where it spreads
along areas of equal density. The danger of
such a current is particularly significant to
the low-speed, shallow-diving submersible
which may get caught in the current and be

631

carried to areas in excess of its collapse
depth before remedial action can be taken.

Sediments: The likelihood of being inundated
by a turbidity current created by natural
causes is probably very slight. The prospect
however, of a submersible causing a turbid-
ity current or sediment slide is possible and,
in fact, has occurred.

During a dive into Toulon Canyon in the
FNRS-3, the vehicle apparently broke a
block of mud loose causing a mud slide or
turbidity current (6). A sediment cloud was
generated which reduced visibility to zero.
In an effort to clear the sediment cloud,
FNRS-3 steered across the canyon on a de-
scending course and ran into the opposite
wall at a depth of 5,250 feet. After more than
an hour’s wait, the sediment cloud caused by
impact with the opposite wall had not
cleared; the vehicle began ascent and finally,
at a height of 800 feet above the bottom,
visibility returned.

An additional hazard would occur if the
slide or avalanche weakened the formation
above the vehicle. Under these conditions it
is conceivable that a sufficient quantity of
sediment can settle on a small submersible
to prohibit the vehicle from ascending. In
this regard, a submersible may collect mud
through openings in the exostructure and
keel—a more likely, but less obvious, means
of accidentally gaining large mud weight.
ALUMINAUT picked up 4,000 pounds of mud
in its keel tanks when it inadvertently slid
down a slope during an H-bomb recovery
mission off Palomares, Spain, in 1966 (7).

Topography: Knowledge of ledges, overhangs
and sheer walls observed in some areas of
the ocean is of utmost importance to the
submersible operator, who is generally re-
stricted to limited visibility and little or no
upward viewing capability. Though the sub-
mersible operator may operate with caution,
even the most competent pilot can find him-
self in an unfavorable position.

During operations in the La Jolla Canyon,
DIVING SAUCER entered an area of the
canyon where the upper walls began to over-
hang and the distance between the walls
became progressively less. Finally, the can-
yon narrowed to such an extent that the
vehicle could not ascend due to the overhang

and it could not progress further upslope due
to canyon narrowing. Owing to its high de-
gree of maneuverability, the DIVING SAU-
CER was able to extricate itself from this
situation; however, many of the less maneu-
verable submersibles might have been
trapped.

Such topographic extremes can produce
acoustic shadows which interfere with any
acoustic link between submersible and sup-
port craft. DEEPSTAR 4000 had occasion to
enter a submarine canyon in the Gulf of
Maine where the walls were so steep that
signals from its pinger could not be heard on
the surface. Consequently, tracking could
not be maintained, and the dive was aborted.

Visibility: The lack of long range visibility
and the limited number of viewing ports can
bring the submersible into contact with all of
the hazards mentioned heretofore. In tropic
and sub-tropic waters, beyond the influence
of terrestrial run-off, long range horizontal
visibility exceeding 200 feet is possible. This
is an optimum condition, however, and is not
common. Beyond the limits of ambient light,
30 to 50 feet of lateral viewing with artificial
light is average.

Even at a speed as low as 1 knot, only 30
seconds are available at 50-foot viewing
range to detect, identify and respond to
bring the vehicle to a halt.

Organisms: It is impossible to evaluate the
over-all reaction of marine organisms to our
invasion of their domain and to identify all
those forms which represent some degree of
hazard.

Over the past 50 years military subma-
rines have logged countless hours in every
body of water on this planet without encoun-
tering any significant threat from marine
life. However, due to the difference in size
and depth range, this experience cannot be
related directly to submersibles. A good ex-
ample is an attack made on ALVIN in 1,800
feet of water by a 250-pound swordfish with-
out any obvious or intentional provocation
on the part of ALVIN. The swordfish’s bill
wedged in the fiberglass superstructure of
ALVIN on the first charge (Fig. 13.6) thus
preventing him from pursuing his attack.

No damage was done to ALVIN, and later
everyone enjoyed a swordfish dinner. But, it
is possible that electrical wires or oil lines

632

could have been severed thus creating seri-
ous problems. A port could have been dam-
aged through impact from a head-on encoun-
ter. Whether this was a ‘‘maverick”’ reaction
or a characteristic reaction to small sub-
mersibles is not known. BEN FRANKLIN
also experienced a swordfish attack during
its Gulf Stream Drift Mission, but with less
dramatic results.

A passive but no less potentially danger-
ous form of marine life, is the giant kelp. It is
quite possible that a submersible penetrat-
ing a kelp “forest”? could become so entan-
gled that return to the surface would be
impossible. This threat is compounded by
redueed visibility caused by heavy growth.

When swimmers are used to support
launch/retrieval, the threat from dangerous
marine animals is compounded. Some of
these threats are obvious in the case of
sharks, but less obvious where Sea Wasps or
other stinging coelenterates are concerned.

Miscellaneous: During operation on the Blake
Plateau in 2,500 feet of water ALUMINAUT
was traveling at 5 feet above the bottom and
approached a large hole. Over this hole the
vehicle descended although the 100-pound
negative buoyancy had not been modified by
the pilot. At least 1,000 pounds of steel shot
had to be dropped before ALUMINAUT could
stop its descent. Since no bottom current,
which could have pulled the vehicle into the
hole, was evident, the cause of descent was
ascribed to fresh ground water seepage out
of the hole which created a less dense water
patch within the cavity. Although this is
supposition by the crew, the fact remains
that ALUMINAUT did descend, and marine
fresh water aquifers are known to exit under
the ocean along parts of the Atlantic coast.
How widespread and prevalent such sub-
aqueous aquifers may be is a matter of con-
jecture. A similar buoyancy change was said
to have occurred when ALUMINAUT tra-
versed the mouth of a large river off Connec-
ticut.

Man-Made Hazards

Cables: Submarine cables represent a dan-
ger of entanglement to the submersible.
While the cable’s route may be known, its
configuration on the bottom can be in snarls
or it may be suspended off the bottom as it

Fig. 13.6 A 250-ib swordfish impaled below ALVIN's viewport. (WHOI)

passes over cliffs or depressions. Most cables
are dark and may or may not provide con-
trast with their background. In some cases
they lay buried beneath the bottom or may
be covered with a thin veneer of sediment. In
the above situations a submersible is open to
snagging the cable with its superstructure,
other appendages or its skids.

A dangerous situation is created by dis-
carded or lost cables which may be present
anywhere in the ocean and in any configura-
tion (Fig. 13.7). Cables laid for power, commu-
nication or data transfer purposes are re-
ported to cognizant authorities and their
location is generally known. In the case of
military cables, this may not always be true.
There are no requirements for reporting or
recording discarded or lost cables.

633

Wrecks: The possibility of fouling in rigging
or appendages is the main hazard involving
wrecks. Because viewing capability is limited
in present submersibles, an operator may
unwittingly cruise under a boom, spar, or
rigging. Corrosion or boring organisms may
have so weakened some appendages that the
slightest pressure could bring a section of
the wreckage down on top of the submersible
or wrap a cable or line around its propellers.

If a wreck is on a steep slope or resting
uneasily on the bottom, a slight nudge may
cause it to shift in a manner jeopardizing the
submersible.

Some wrecks may lie in depths where truly
watertight compartments, containers, air
bottles, boilers, and the like are near their
collapse point. It is conceivable that a dis-

Fig. 13.7 A tangle of cable at 5,500 feet in the Bahamas as seen from ALVIN

turbance of the wreckage could cause them
to implode with consequent serious damage
to a submersible in the vicinity.

Bottom Hardware and Buoyed Arrays: Bottom
hardware may consist of military tracking
devices, oil pipelines and completion systems,
and a host of scientific equipment. Similar to
cables and wrecks, they present another
form of potential entanglement. Most bottom
hardware has one thing in common: cables
generally lead from them to shore or surface
terminals. Some of this hardware is very
heavy and may have moved downslope fol-
lowing implantment. This can result in the
attendant cable being stretched taut from

634

the equipment and suspended several feet
off the bottom so that the bottom-crawling
submersible may pass under the cable. The
array itself may have several appendages
protruding outward which can snare the sub-
mersible. These appendages may be many
feet off the bottom and not visible to the
operator when bottomed.

The most hazardous aspect of all arrays,
moors and similar hardware may result from
the method used to install them. In many
cases additional lines are used to lower the
device and are left on it for subsequent re-
trieval. The result is an undisclosed and gen-
erally unknown number of lines or cables

lying at the base or hanging from various
portions of the array. Rigging and handling
lines may part under heavy strain resulting
in a large ball of loops, snarls, etc. These
lines, which are generally not shown in the
array or buoy schematic, can be more haz-
ardous than the hardware itself.

Surface Traffic: The primary danger to the
submersible from surface traffic is the possi-
bility of surfacing under or in the path of
transiting vessels, and, to a lesser degree,
being snagged by a fishing vessel. Most sub-
mersibles lack the control and the sensors
necessary to stop ascent and assure that no
surface traffic is present. Although the sub-
mersible’s support ship may be displaying
the proper signals to denote subsurface op-
erations, commercial or pleasure craft may
and often do ignore them.

Subsurface Traffic: The possibility of collision
with a fleet-type submarine in the open sea
is small. There are, however, areas of the
ocean clearly marked on navigation charts
as submarine transiting lanes. In some in-
stances clearance to operate in these lanes
and various ranges can be obtained by prior
arrangement and appropriate charts along
with supporting data may be available prior
to an operation. Although the operator is
under no legal requirements to coordinate
his efforts with the Navy, to ignore such
lanes and operating areas can place the sub-
mersible in danger of collision.

Explosive Ordnance: Millions of tons of explo-
sive ordnance have accumulated on the floor
of the world’s oceans and seas, particularly
over the last century. Explosive projectiles,
sea mines, torpedoes, depth charges and
bombs, hedgehogs and aerial bombs repre-
sent a threat to submersibles. Some may
detonate only by contact, but others may be
detonated magnetically or by pressure
changes. The submersible operator will ob-
viously avoid ammunition dumping sites, but
an inestimable amount of ordnance litters
the ocean floor at all depths and in all loca-
tions. The nature of this hazard is discussed
in detail in reference (4). The explosive
threat is not the only aspect of such ord-
nance; moored mines have employed moor-
ing cables ranging in length from less than
100 feet to 5,000 feet. The cable is small in

635

diameter and is connected to an anchor
which, depending upon the mine, may range
in weight from about 300 pounds to 1,500
pounds (in air) and is connected at the other
end to a mine case which may range in
weight from 50 pounds to 1,000 pounds (in
air). Snagging or becoming entangled in this
cable could represent a serious hazard. In
some areas the density of these cables and
anchors is quite high. For instance, in the
zone running between the Orkney Islands
and the coast of Norway some 71,000 cables
and anchors litter the bottom.

Miscellaneous: The effects of radioactive
wastes and corrosive chemicals on a sub-
mersible may not be immediate, but the long
term effects of investigating such dumping
grounds could be hazardous, not only to the
vehicle itself, but to the surface support crew
as well.

Abandoned, lost and discarded junk of all
descriptions litters the sea floor, especially in
areas of high surface traffic. In most cases,
information is unattainable concerning such
debris and the pilot is left to his own discre-
tion. Little can be said concerning where
discarded hardware, cables, and lines will be
encountered except that historically high
density ship traffic areas are the most likely
areas. Harbors, roadsteads and channels—
contrary to rules and regulations—are gen-
erally littered with all types of debris. Lim-
ited visibility generally prevails in such
areas, and the practice of making shallow
test dives in a harbor while the surface ship
is conveniently tied up may lead to unfore-
seen consequences. Fortunately, these areas
are generally shallow and therefore permit
diver assistance in the event of an
emergency.

From the foregoing list of potential haz-
ards, it would appear that diving is a danger-
ous pastime; it is. In spite of the cute names
given to some vehicles, there is nothing cute
about cold, pressure, asphyxiation or drown-
ing, and the high safety record in submersibles
reflects the fact that serious, contemplative
consideration of such hazards has preceded
the thousands of successful dives. Such con-
sideration follows two fundamental planes:
Preventing the emergency, and responding
to it. Certification and classification are the
frontline defenders for prevention.

Prevention of emergencies commences
with the design stage of the submersible
system and continues throughout construc-
tion and fabrication by virtue of quality con-
trol and testing of materials, components
and systems. In essence, the builder at-
tempts to construct a submersible following
sound engineering principles and practices.
As shown in this chapter, there is no legal
requirement for the builder to adhere to any
particular guideline, but if he wishes to lease
to the U.S. Navy or other governmental
agencies the vehicle must meet standards
selected by these agencies. Prevention of ma-
terial failures, then, falls under the topic of
material certification and the various stand-
ards are presented later in this chapter.

The operator of a private submersible need
only meet his employer’s or his own training
and competency standards. These also are
dealt with later. It is sufficient to note that
sound engineering procedures and well-qual-
ified, knowledgeable operators are the main
ingredients of a safe diving program.

A third category under prevention of emer-
gencies is Operational Safety—the process of
predetermining whether a proposed mission
is safe to undertake in the first place. Deter-
mining the risk factor in a proposed mission
involves weighing the vehicle’s design and
capabilities against the nature of the job and
the conditions one can anticipate at the job
site.

One approach to this determination can be
to take those Natural and Man-Made Haz-
ards listed above and consider the likelihood
of their occurring or hindering the submers-
ible’s operation. Such an approach involves
thorough research into the literature con-
cerning the candidate dive site. Having de-
termined what the environment holds in
store, one may then evaluate whether or not
the vehicle can safely contend with these
conditions. Unfortunately, this procedure is
not quite so simple, because, though a great
deal is known of the world oceans, it soon
reduces to generalities and a submersible
does not dive generally, it dives specifically.

While many difficulties lay in the path of
gathering operational safety information,
the results, no matter how meager, do pro-
vide some indication of what may be ex-
pected and may identify areas of investiga-

636

tion which the mission planners did not con-
sider.

The final judgement on what is or is not a
safe operational practice can be debatable.
Generally the operations officer and the op-
erator have sufficient experience and sea-
manship ability to provide expert opinion
which the user follows. On the other hand,
there are no time-honored principles in sub-
mersible diving as there are with military
submarines, although some military operat-
ing procedures can be applied. What might
be considered a foolish procedure for one
submersible, may be entirely safe for an-
other. It is not difficult to foresee where the
present work of inspecting of oil well heads,
pipelines and associated equipment will lead
submersibles into conditions as potentially
hazardous as a scuttled ship. And, being
quite practical, if that’s where the money is
the submersible owner faces two options: Do
the job or go out of business. Hence, judging
the safety or risk of a particular task is
accompanied by economic considerations
which may prompt the commercial user to
attempt a maneuver the scientific user feels
too risky.

U.S. NAVY CERTIFICATION

The U.S. Navy defines a manned submers-
ible as “. . . any ship, vessel, capsule or
craft capable of operating underwater with
or without propulsion, on and under the
surface of the water with the operator(s)
and/or passengers embarked in a dry habi-
tat and which by its design is incapable of
defensive or offensive action in combat”
(Secretary of the Navy Instruction 9290.1A).
This definition includes habitats such as
SEALAB, rescue chambers of the McCann
type and tethered and untethered manned
submersibles, both military and non-mili-
tary. Provisions of this instruction allow mil-
itary or civilian naval personnel with proper
authority to dive in a non-certified vehicle on
an occasional or one-time basis for specified
purposes of indoctrination, evaluation or re-
search. A vehicle can remain uncertified and
still operate under Navy contract as long as
naval personnel (military or civilian) do not
dive in it.

Navy certification is divided into three
areas: a) Systems certification, b) operator(s)
competency and c) operational safety. The
Chief of Naval Operations (CNO) was as-
signed the responsibility of assuring safety
in these areas and delegated systems certifi-
cation to The Chief of Naval Material (CNM),
who subsequently directed the Naval Ship
Systems Command (NAVSHIPS) to promul-
gate the criteria by which submersibles can
be evaluated for certification. Submarine De-
velopment Group 1 (SUBDEVGRU-1) was
designated as the inspecting activity for op-
erators’ certification, and their requirements
are outlined in Chief of Naval Operations
Instruction (OPNAVINST 9290.3). Chief of
Naval Operations (OP-23) is the recipient of
information on operational safety aspects
and pertinent environmental data.

Systems Certification
Certification of a submersible for material
and procedural adequacy must be obtained
by the Naval user prior to signing a contract
for lease or purchase. When a naval activity
contracts for construction of a vehicle the
certification requirements must be invoked.
Those submersible systems which material
and procedural adequacy treats fall under
the Certification Scope and “. . . includes
the sea water pressure boundary, the mate-
rials, equipment, and operating procedures
systems, needed to recover from a malfunc-
tion or accident and above all a system for
sustaining life which will permit recovery
of the operators, divers, or occupants of the
Deep Submergence System without unduly
impairing their health or well being.” (8).
Examples of such systems or equipment are:
Pressure hull, hard structure and appurte-
nances
Ballast systems
Life support systems
Jettisoning systems
Non-pressure compensated equipments
subject to implosion
Release devices for external appendages
Fire fighting devices or systems
Intership/intraship communications sys-
tems
Depth measurement devices
Obstacle avoidance systems and electric
propulsion motors as applicable

637

Accessibility to vital equipment
Submersible stability and buoyancy
Buoyancy materials and/or devices
Electrical power systems

Operating procedures

A detailed and lucid explanation of the
requirements for systems and procedural ad-
equacy is presented in NAVMAT Publication
P-9290 of July 1973 System Certification
Procedures and Criteria Manual for Deep
Submergence Systems which is available to
the public through the Government Printing
Office.

To obtain Navy certification a submersible
must first be sponsored by a projected Naval
user. Only the highlights of Navy material
certification will be discussed, and informa-
tion regarding this aspect of certification
was obtained mainly from the above
NAVMAT publication.

Required Records

The scope of certification is not a pre-
determined list of Naval demands but is a
detailed list of those portions of the submers-
ible which in the builder’s judgement fall
within the certification scope.

Additionally, the applicant is asked to pro-
vide the criteria and supporting justification
for limiting the scope of certification. Gener-
ally, the following procedures are expected:

—the applicant must establish and identify
the pertinent design parameters, e.g., op-
erating depth, safety factors, design life,
etc., used in the design and needed to
evaluate the safety of the submersible;

—a design review report should be submit-
ted which minimally includes a summary
description of the vehicle, design param-
eters, agreed-upon certification scope,
system descriptions, operability and
maintenance criteria and procedures and
material justification;

—the design of each system, including the
fluid, electrical, compressed air and gas
systems, must be described by the appli-
cant;

—design calculations which state all as-
sumptions and rationales used in the
analyses must be submitted to demon-
strate the adequacy of design;

—test reports, used to justify design ade-
quacy, must be self explanatory, conclu-

sive, and must include a description of
the test set-up, test conditions, instru-
mentation and accuracy of measure-
ment;

—up-to-date copies of the manufacturing
drawings of each component and system
evaluated in the design analysis must be
submitted;

—it is desired, but not a stated require-
ment, that there also be submitted such
analyses as an information flow diagram,
an operational sequence diagram and a
human engineering analysis of the in-
strumentation and control station lay-
out;

—all materials used within the certifica-
tion scope in the design of the vehicle for
expected service environments must be
justified. This is to determine the possi-
bility of galvanic corrosion on adjacent
materials, and emission of noxious odors
from points, insulation or other compo-
nents within the vehicle which may give
off such odors below 200°F. Flammable
materials are also considered.

Introduction of New Materials

To anticipate the introduction of new ma-
terials into a rapidly advancing technology,
candidate materials and/or components are
grouped into the following categories:
Materials and/or components
which have had a considerable
amount of fabrication and oper-
ational experience in the in-
tended environment and for the
intended application. Examples
are HY 80 and HY 100 plate
(MIL-S-16216) for spherical or
cylindrical pressure hulls 70/30
Cu-Ni (MIL-C-15726) valve bod-
ies and lithium hydroxide
(LiOH) for CO, removal at am-
bient pressure.
Materials and/or components
which have had a considerable
amount of commercial opera-
tional use but lack an apprecia-
ble degree of experience in a
marine environment or in the
proposed application. Examples
in this category are given as
certain types of aluminum, tita-

Category |:

Category 2:

638

nium and several high and low
strength steels.

Materials and components for
which definitive information
and experience are not yet
available. Examples in this cate-
gory are such pressure hull ma-
terials as ultra high strength
steel, titanium, aluminum, ce-
ramics, plastics or glass or com-
binations of these.

The burden of proof that the material or
component is adequate and the justification
of the acceptance criteria is upon the appli-
cant who must present such to the reviewing
board.

Category 3:

Construction and Fabrication Processes

The applicant must also meet various re-
quirements in regard to the construction and
fabrication processes for systems within the
certification scope. These processes include
work procedures, heat treating instructions
and welding and assembly procedures. In
essence, the applicant should include all con-
struction and fabrication procedures that af-
fect the design performance of the system or
component.

Quality Assurance

The applicant must demonstrate that an
effective quality control program has as-
sured that all design requirements of the
systems and components within the certifica-
tion scope of the submersible are met in
order to assure vehicle safety.

Testing
Systems within the scope of certification
must be tested to demonstrate their ade-
quacy, e.g., pressure hull strength, flotation
and buoyancy systems, emergency deballast-
ing and jettisoning systems, electrical insu-
lation integrity and safety features. Three
general testing categories are required:
development tests: To verify the perfor-
mance of materials, mechanical designs
and systems which are unique to the
marine environment;
quality assurance tests: To demonstrate that
the components, materials and fabrica-
tion of the vehicle meet the require-
ments of design;

operational and proof tests: To confirm the

designs and operational characteristics

of the submersible.
These are further divided into Pre-Sea Trial
Tests and Sea Trial Tests. In the latter, tests
within a single dive or a series of dives are
made to the vehicle’s maximum operating
depth with members of the certifying team on
board.

Operability and Maintenance

Written procedures are required for both
the normal and emergency submersible oper-
ations, as well as a checklist of major evolu-
tions such as repair, maintenance and in-
spections. Appendix III presents daily main-
tenance routine and checklist as an example
of such procedures.

Survey of the Submersible

Subsequent to all dockside testing, a sur-
vey of the vehicle will be made to determine
that it was actually built and will perform as
designed. The survey team is composed of
naval and applicant representatives.

Tenure of Certification

Once having obtained Navy certification
the sponsor user or operator must maintain
review records and procedures in order that
the vehicle remains certified. Certification is
not granted for the design life of the vehicle,
but is generally based on its intended mis-
sion profile and operating and test history.
Major overhauls, expiration of a lease or
breaching the scope of certification automat-
ically terminates material certification. The
tenure of certification is categorized into
three areas: 1) Sustaining certification, 2)
Continuance of certification and 3) Recertifi-
cation.

1) Sustaining Certification —This is action to
assure that the submersible remains in the
“as certified” condition for the period of cer-
tification. Sustaining certification is gener-
ally the responsibility of the Naval user and
the civilian operator. In order to sustain
certification the responsible party must ap-
prise NAVSHIPS of the following: All design
changes within the certification scope or
those which could change the certification
scope; that repairs and maintenance have
been conducted so that all systems and com-
ponents within the scope of certification op-

639

erate normally before each dive; that re-
quired periodic inspections of certification
scope systems and components have been
performed and the results forwarded; and
that the vehicle has and will operate within
its certified operational limits. Finally NAV-
SHIPS must be advised of all abnormal situ-
ations such as excursions below certified
depth, collisions, grounding, entanglements,
fires and emergency ascents.

2) Continuance of Certification his category
applies to the extension of certification be-
yond the initial period granted, and it nor-
mally accommodates continued use of a vehi-
cle which has undergone no changes to the
basic design, the scope of certification or
general operating characteristics. To main-
tain this condition all the requirements and
procedures of ‘Sustaining Certification”
must be observed.

3) Recertification —Breaching the scope of
certification, major overhauling or termina-
tion of a lease shall cause the initial certifi-
cation to expire, and the applicant must rees-
tablish a scope of certification and fulfill all
the requirements that were necessary for
initial certification.

External Instrumentation

Instrumentation or devices external to the
submersible also fall within the scope of cer-
tification, although they may have nothing
to do directly with the operation of the vehi-
cle. The potential hazard of such instrumen-
tation—e.g., manipulators, transducers,
oceanographic sensors, cameras, etc.—may
rest either in their imploding, if not pres-
sure-compensated, or in their becoming en-
tangled and immobilizing the vehicle if the
instrument is not jettisonable.

In the case of the pressure-resistant (vs.
pressure-compensated) component or system
implodable volume and standoff distance are
the critical factors. If the volume of the
instrument is such that by imploding it could
cause a casualty to any component within
the certification scope it must be mounted a
minimum “standoff” distance from such crit-
ical components so that if an implosion oc-
curred the component would not be affected.
The guidelines for determining the criticality
of systems and/or components which may
implode and cause material damage are pre-

sented in reference (8), and a sample calcula-
tion is presented in Figures 13.8 and 13.9. It
is noted that this sample calculation applies
only to spherical pressure hulls of design
crush depth 1.5 times or greater than the
design depth and not fabricated from a brit-
tle material such as glass or ceramics.

When a non-pressure compensated item
has a critical implodable volume and cannot

be waived from a NAVSHIP’s point of view,
then the component must be cycled nine
times to 1.5 times its operating depth and
held at that depth for 10 minutes on each
cycle; on the tenth cycle it must be held at
greatest pressure for 1 hour (35°F in seawa-
ter is recommended). Any leakage or visible
indications of change result in test failure.
Where instruments extend beyond the ve-

MINIMUM STANDOFF DISTANCE FROM A SPHERICAL DSS FOR AN IMPLODABLE CAMERA CASE

MMe =o. | ae

ile CALCULATE INSIDE VOLUME

V = 7 (3/2)2 X 16

Vv

Tm (9/4) X 16 = 36 X = 113 CUBIC INCHES

2. ENTER GRAPH UNDER MAXIMUM DESIGNED DEPTH OF 6000’ AND VOLUME OF 113 CUBIC INCHES

TO GET K-FACTOR.

K ~ .85
é
3. MULTIPLY K-FACTOR BY
JR
R = 3.5’ > (3.5)'/2 = 1.87
85
MINIMUM STANDOFF DISTANCE =—7>- = .

MINIMUM STANDOFF DISTANCE = 5-1/2”

WHERE R IS THE PRESSURE HULL RADIUS IN FEET.

THIS IS THE MINIMUM STANDOFF FOR CONSIDERING AN ITEM OF “NON-CRITICAL
VOLUME.” TESTING PER PARAGRAPH C.3 OF REF. (8) WOULD NOT BE REQUIRED
AS LONG AS THE HULL STANDOFF IS GREATER THAN 5-1/2’ AND THE ITEM IS
NOT LOCATED WITHIN 5-1/2’° FROM ANY CERTIFICATION SCOPE ITEM.

Fig. 13.8 Sample calculation (assume spherical DSS has 6,000-ft maximum design depth).
640

SS |S // (ei BAAVTA/AEEA
S/R Ay ae ASAE

ESS CaS SSiyasae

fae

IMPLODABLE VOLUME IN CUBIC INCHES

20

ye

tht LY
WOT AAO
Ty anal

Haas

40 506.0 8.0 10.0

K-FACTOR

Fig. 13.9 Minimum standoff distance for implodable items (spherical pressure hull).

hicle’s greatest diameter and fouling on a
wire or line is a distinct possibility, the rules
are flexible. There is no limit to the size of an
object which can be attached externally to
the vehicle, but if it apparently protrudes to
the point where fouling is possible it must be
jettisonable. Again, there is no required
method of jettisoning, but pyrotechnic re-
lease devices, e.g., explosive bolts (Fig.

641

13.10), are preferred over weak-link devices.
One type of component which can cause
problems in this area is the manipulators
or mechanical arms. If in the process of
repairing or moving a heavy cable or piece of
hardware, the manipulator fails and its grip
cannot be released or if it becomes fouled in
an appendage, it must be possible to jettison
the arm(s). In general, the more streamlined

Ty APPLIANCES CO,

c.- 4M-U

ol ie ie

Fig. 13.10 All power cables and support cables leading from the brow on DEEPSTAR 2000 can be severed by the guillotine cutter on the right by electronically actuating an explosive
squib (left) from within the pressure hull

the submersible the easier it is to certify in Operator Competency

terms of snagging or fouling potential. According to OPNAVINST 9290.3, opera-
A flow diagram showing the milestone tors of a submersible include “‘. . . those

events of material certification is presented personnel who physically control the oper-

in Figure 13.11. ating parameters of the submersible such as

642

MAJOR CERTIFICATION EVENTS

APPLICANT/SPONSOR

DEFINE OBJECTIVES, SUMMARY DESCRIPTION,
OVERALL PARAMETERS, AND DESIRED TENURE
PERIOD.

APPLICANT/SPONSOR & SCA
NEGOTIATE CERTIFICATION SCOPE, PSOB &
MILESTONE EVENT SCHEDULE.

APPLICANT/SPONSOR
COLLECT AND SUBMIT CERTIFICATION
DOCUMENTATION.

SCA
PERFORM DOCUMENTATION TECHNICAL REVIEW
AND EVALUATION.

SCA
PERFORM DSS ON-SITE SURVEY.

APPLICANT /SPONSOR
PERFORM CERTIFICATION OPERATION (DIVE).

SCA
ISSUE CERTIFICATION CERTIFICATE.

APPLICANT /SPONSOR
SUSTAIN CERTIFICATION THROUGHOUT TENURE.

Fig. 13.11 Flow chart, system certification milestone events.

depth, course, speed, pitch, roll, etc. Oper-
ators include those crew members whose
control functions are essential to the safe
operation of the submersible.”

643

Except in special cases, all Navy-owned
submersibles require operators who are mili-
tary personnel and ‘‘Qualified in Subma-
rines.” In the case of privately-owned sub-
mersibles leased by the Navy and Navy sub-
mersibles operated (piloted) by civilians the
following documents are required which the
sponsor or prospective user must assure are
forwarded:

1) A written statement of physical exami-
nations and certification of the oper-
ator’s fitness by a medical doctor;

2) A copy of the physical requirements set
forth by the operator’s employer;

3) A resume of the operator’s background
and level of competence;

4) Seuba qualifications (for lock-in/lock-out
submersibles);

5) Operator’s qualification notebooks if re-
quired by the operator’s company;

6) Dive Logs if maintained by pilot.

This information is reviewed by Submarine
Development Group One which also conducts
an in-depth interview of each pilot expected
to operate the submersible during the lease
period. This interview is to determine the
operator’s knowledge of the submersible de-
sign, construction, operation and handling
characteristics. After determining that the
foregoing is satisfactory a qualified officer is
designated to dive in the vehicle and observe
the operator(s) during a demonstration dive
which requires operations similar to those
anticipated during the lease period. Qualifi-
cation as a pilot in one submersible is not
transferable to a different submersible.

Operator recertification is required when
the operator has not piloted the vehicle for 6
months or after a major equipment change
or major alteration (as determined by CNM).

The naval passengers themselves are also
required to undergo submarine physical and
psychiatric examinations before they can
dive and must repeat these examinations at
periodic intervals (every 3 years for the men-
tal examination and annually for the physi-
cal).

The Deep Submersibles Pilots Association
Qualification requirements of operators or
pilots as recommended by the Deep Submers-
ibles Pilots Association are in general agree-
ment with Naval standards. Membership in

the Pilots Association, a voluntary organiza-
tion begun in 1967, requires a person to have
been the pilot in command of a submersible
on at least five dives with one to the mini-
mum depth of 200 meters. The association
considers the following as constituting pilot
requirements and training:
Experience —A solid background of sea-
going experience is primary, and scuba
diving, aircraft flying, power boat maneu-
vering and submarine experience are de-
sirable, but not necessary. Motivation and
demonstrated work competence are the se-
lecting criteria.
Physical Requirements —Navy physical re-
quirements for submarines are considered
too stringent, but may serve as a guideline
for ascertaining the required good general
health.
Psychological Requirements —Stability, matu-
rity and general reliability and compe-
tence should be demonstrated, if possible,
under actual diving operations.

Training and Familiarization —The candidate
should display a working knowledge of:
Diving principles, submersible construc-
tion, operational performance and emer-
gency procedures; environmental limits
(physiological) of living in a closed environ-
ment; test, maintenance and overhaul pro-
cedures and surface support requirements
and procedures; small boat piloting; the
ocean environment; and some first aid.
Operational Training —The candidate must
successfully demonstrate his ability to:
Maneuver and launch/retrieve the sub-
mersible under both normal and emer-
gency conditions; operate all normal and
mission oriented equipment; perform sup-
port functions and maintenance; and suc-
cessfully deal with such environmental
systems emergencies as might occur in the
cabin (pressure capsule) when submerged.
The Association considers a pilot’s qualifi-
cations to be current if he is continuously
and actively involved in the submersible’s
operation. If he is not actively involved for a
period greater than 6 months or if a major
equipment change has occurred with which
he is not familiar he should requalify. Quali-
fications from one submersible design to an-
other are not transferable. Annual physical

644

examinations are required and age, by itself,
is not a disqualifying factor.

Operational Safety

Owing to the controls which can be and
generally are applied, the prospects of a sub-
mersible getting into trouble due to material
failure and operator incompetence are un-
likely. On the other hand, the lack of opera-
tional experience and the gross nature of our
basic oceanographic knowledge provide am-
ple opportunity for at-sea mishaps. (See
Chapter 14.)

By direction of OPNAVINST 9290.2 series
the naval users of submersibles are held
responsible for assuring non-interference
with surfaced or submerged shipping in the
projected operations area. They must evalu-
ate environmental conditions which may af-
fect communications and the operation and
must insure that dates, times, locations, de-
scription of the submersible and support ship
and the nature of the operation are pub-
lished in the appropriate Notice to Mariners.
Additionally they must, through the Com-
mander Submarine Force, U.S. Atlantic
Fleet, reserve an area of operations that
precludes interference with Naval opera-
tions. Along with the above information they
must also submit to the Chief of Naval Oper-
ations (OP-23) the mission objectives, de-
tailed plan of activities, rescue and salvage
plans, area assignments and communication
plans. The operational safety aspects of sub-
mersible certification are a consideration al-
most equally as detailed and demanding as
material certification to the naval user. In-
deed, as more submersibles are used and as
more attention is focused on this area, certi-
fication of operational safety shows every
indication of assuming equal importance.

Full Naval Certification is not only costly
but time-consuming. It can take from several
months to several years, and the prospective
user must be prepared well in advance for
problems of variety and complexity, both
with hardware and personalities.

AMERICAN BUREAU OF
SHIPPING CLASSIFICATION

Classification by the American Bureau of
Shipping (ABS) is voluntary and represents

the only detailed civilian guides for submers-
ible construction. Classification by the Bu-
reau is instigated by the submersible owner
at his request, and all expenses incurred in
the process are borne by him. These ex-
penses may range from $2,500 for a NEK-
TON-type vehicle to over $25,000 for a BEN
FRANKLIN-type vehicle (M. Letich, ABS,
personal communication).

The American Bureau of Shipping defines
a submersible as ‘*. . . any vessel or craft
capable of operating under water, submerg-
ing, surfacing and remaining afloat under
weather conditions not less severe than Sea
State 3, without endangering the life and
safety of crew and passengers.’ In their
Guide for the Classification of Manned Sub-
mersibles (9) they present the requirements
and procedures which must be considered in
the certification of a submersible by ABS.

ABS states in the foreword to their guide
that their limited commercial experience in
submersible operations requires that the
guide be considered as an attempt to make
various procedures and techniques available
to designers until sufficient operating expe-
rience is available from which more defini-
tive requirements can be formulated. In es-
sence, the guide presents the minimum re-
quired information for drawings and calcula-
tions which must be submitted for classifica-
tion. Additionally, a portion of the guide
deals with surveys required during and after
construction by ABS surveyors.

Required Drawings

—Pressure hull and appurtenances

—Non-pressure hull (superstructure,
fairwater, etc.)

—Tanks not subject to submergence
pressure

—Foundations to equipment

—Ballast and blow systems

—Deballasting/jettisoning systems

—Release devices for external appen-
dages

—Anchor, lifting and handling systems

—Propeller

—Propulsion machinery with shafting,
bearings and seals

—Control surfaces

—Electric wiring and equipment

—Life support systems

645

—Fire fighting systems
—Intership communication systems
—Ship-to-shore communications

Required Calculations

—Stability (normal and emergency)

—Buoyancy

—Equilibrium polygon

—Minimum freeboard

—Foundations to vital equipment

—Tanks subject to submergence pres-
sure

—Pressure hull

—Life support

—Lifting and handling attachments

—Electric load analysis

—Piping systems vital to crew safety and
vehicle survival

Buoyancy Characteristics

1) Surface Buoyancy—Through calcula-
tions and/or tests demonstrate that the vehi-
cle can surface and remain so without jeop-
ardizing vehicle safety in normal sea condi-
tions (Sea State 3) and with adequate free-
board.

2) Neutral Submerged Buoyancy—Through
calculations and/or tests demonstrate the ve-
hicle’s ability to hover at a fixed depth at
even keel at zero speed while submerged and
under all loading conditions unless acted
upon by an outside force.

Stability and Trim Characteristics
The designer must demonstrate through
calculations and/or tests that the stability
and trim characteristics of the vehicle are
adequate for the following Normal condi-
tions:
1) Operating on the surface
2) Transient
3) Underwater operation
The designs must also show by calculation
and/or tests that under any possible combi-
nation of dropped jettisonable weights the
submersible would retain adequate stability;
this is referred to as Emergency or Damage
Condition. Additionally, the vehicle’s ability
to survive within certain identified damaged
conditions should be verified by calculation
and/or testing.

Ballast System Requirements
Owing to its extreme importance to safe

operations, complete details of ballast sys-
tem materials and design are to be submit-
ted with special attention given to methods
of attachment to hull and protection against
external damage. Tanks and piping mate-
rials must be tested and inspected in accord-
ance with ABS rules where applicable. Fab-
rication, installation and testing of the bal-
last system should be carried out in the
presence of ABS surveyors.

Maneuverability and Controls

If rudders and/or diving planes are used
for maneuvering, detailed drawings of them
must be submitted which include steering
mechanisms and necessary controls. All sub-
mersibles are required to have some means
of determining their location and avoiding
obstacles when submerged.

In addition to the general guidelines pre-
sented above, the ABS manual provides ex-
cellent guidance of a more specific nature on
the design, construction, and testing of the
pressure hull, “exostructure,’ environmen-
tal control, mechanical equipment, electrical
equipment, emergency equipment, proce-
dures followed during surveys and lock-in/
lock-out contrivances. The ABS also requires
submission of a spare parts list, and the
appendices to the manual deal with support-
ing data for Class II materials and sustain-
ing data for Class III materials (similar to
Naval classification of materials I, II, III).
Requirements for toughness testing, X-ray
acceptability standards and environmental
control parameters are also to be included.

Adherence to the ABS guidelines during
submersible construction does not imply that
certification by the Navy is a rubber-stamp-
ing effort, since several areas of the vehicle’s
construction and operation are dealt with in
different fashion by both. However, the ABS
guidelines have drawn heavily on naval sub-
marine experience. Indeed, several members
of the committee who contributed to this
manual are directly or indirectly involved
with Naval certification.

The original 1968 ABS Guide is being ex-
panded and revised, and will be published as
the ‘‘Guide for the Classification of Under-
water Vessels and Related Systems.’’ The
new guide, according to Letich (11), will in-
clude:

646

1) Lock-out submersibles

2) Tethered submersibles

3) Submersible vehicles

4) Small submersibles

5) Stationary underwater vessels

6) Support ships

7) Diving systems

8) Launch and recovery gear

9) Equipment including requirements on

anchors and chains, lines and umbilical
cords.

The submersible builder of today is in a far
better position to build a safe, certifiable
vehicle than his predecessor, for the combi-
nation of the NAVMAT criteria, the ABS
guidelines and the guidelines presented in
Marine Technology Society’s Safety and Op-
erational Guidelines for Undersea Vehicles
provides a wealth of knowledge heretofore
unavailable to early submersible builders.

U.S. COAST GUARD
REQUIREMENTS

Present U.S. Coast Guard submersible reg-
ulations are essentially non-existent owing
to lack of legal authority pertaining to the
small submersibles now operating. All sub-
mersibles presently operating under a U.S.
flag and which carry no more than six pas-
sengers fall under the Motor Boat Act of
1971 and must comply with ‘‘Rules and Reg-
ulations for Uninspected Vessels,’’ subchap-
ter 6, CG—258. This act requires that the
submersible have running lights, a fire ex-
tinguisher and life preservers for each per-
son aboard, and that it display its state
registration number (personal communica-
tion, CDR Charles B. Glass, USCG).

In the case of the following submersibles
the regulations governing surface ships
again apply, but are more stringent and com-
plex by requiring that the submersible
owner show the vehicle to have been built
following good engineering practices:

a. Submersibles not more than 65 feet in
length and under 100 gross tons carrying
more than six passengers;

b. Submersibles more than 65 feet in
length and over 15 gross tons carrying pas-
sengers for hire;

c. Submersibles more than 15 gross tons
carrying freight for hire;

d. Submersibles 100 gross tons or more
carrying passengers;

e. Submersibles 300 gross tons or more;

f. Any submersible carrying combustible or
flammable liquid in bulk;

g. Any submersible carrying dangerous
cargo.

The standards to be met are based upon
the Coast Guard’s background of engineering
talent, which additionally draws from U.S.
Navy and American Bureau of Shipping
certification requirements and the proce-
dures outlined in the Marine Technology So-
ciety’s guidelines for undersea vehicles. The
proposed civilian use of ex-military subma-
rines for under-ice surveys in the Arctic
would fall under this category.

SEARCH AND RESCUE
RESPONSIBILITIES

Contrary to its present limited role in sub-
mersible certification, the Coast Guard has
the sole responsibility for search and rescue
of civilian submersibles. Though presently
limited in its own undersea rescue capability,
the Coast Guard may request assistance
from the U.S. Armed Forces under the gen-
eral concepts of a National Search and Res-
cue Plan referred to as SAR. This plan is a
federal inter-agency agreement established
to assure coordinated response among fed-
eral agencies in the event of a search and
rescue emergency. Briefly, it works as de-
scribed below.

There is a Coast Guard Rescue Control
Center (RCC) in each of its 12 districts, and
within each district are several SAR sta-
tions. The operators of a submersible in dis-
tress contact the nearest SAR station on
2182 kHz or 156.8 MHz and informs it of the
nature, location, etc., of the emergency. The
SAR station begins taking immediate action
with whatever assets it has on hand, and
concurrently informs the RCC within its dis-
trict. In the event that the need arises for
underwater rescue calling for assets beyond
those of the Coast Guard, the RCC requests
assistance from Chief of Naval Operations
(CNO) who provides such through the Navy’s
Supervisor of Salvage (SUPSAL). An on-
scene commander (OSC) is designated by
CNO to carry out rescue procedures as he
sees fit.

647

As one step in expediting safe civilian sub-
mersible operations, the Coast Guard estab-
lished a voluntary reporting system to: 1)
Provide immediate information to their Res-
cue Coordination Centers in the event of an
emergency; 2) lessen the possibility of incor-
rectly identifying the submersible as a for-
eign naval submarine; 3) prevent undersea
conflicts with other surface or subsurface
vessels in the area of operation; and 4) pro-
vide the general maritime community with
notice that such operations are being con-
ducted.

In a notice to all owners, manufacturers
and operators of civilian submersibles, dated
11 August 1967, the Coast Guard Comman-
dant asked for cooperation in providing to
the nearest Coast Guard District Com-
mander the following information prior to
commencement of each operation:

a. General submersible description;

b. Operations area, surface and sub-

merged;

c. Dates and times of start and termina-

tion of operation;

d. Any special methods of warning surface

ships of surfacing intentions;

e. If surface craft accompanying, give gen-

eral description of such;

f. Emergency communications capability

of support ship and submersible;

. Information helpful in event of distress,
e.g., escape capability, life support dura-
tion, flotation gear and location aids
aboard submersible.

According to Lieutenant R. Pyzer, USCG
(personal communication), response to this
request was excellent initially, but has grad-
ually become a “sometime thing” in all but
military-owned and federally-leased vehicles.
With the recent JOHNSON SEA LINK and
PISCES III incidents (see Chapter 14), how-
ever, compliance with this request has in-
creased in the private sector.

MARSAP

An acronym for Mutual Assistance Rescue
and Salvage Plan, MARSAP is an attempt by
industry’s owners of submersibles to be able
to render assistance to a distressed submers-
ible. The MARSAP report and reeommenda-

tions (never formally published) cover var-
ious standard equipment a member-submers-
ible should carry and techniques employed in
a rescue situation. The plan, however, ran
into some difficulty regarding indemnifica-
tion and liability of the rescuer, and has
languished since its inception in 1967.

INSURANCE

According to the Marine Technology Soci-
ety’s Guidelines (10), the owner or operator
of a submersible is required by law to carry
insurance covering employees engaged in
the operation of a submersible and the sup-
port ship. This coverage is required for any
employee subject to:

1. U.S. Longshoreman’s and Harbor
Worker’s Compensation Act, U.S. Code (1946)
Title 33, Section 901-49 or,

2. U.S. Longshoreman’s and Harbor
Worker’s Compensation Act as extended by
act of August 7, 1953 (Public Law 212, 83rd
Congress, the Outer Continental Shelf) or,

3. The Defense Bases Act, U.S. Code (1946)
Title 42, Section 1614-54 (Public Law 208,
77th Congress as amended) and the provi-
sions applicable thereto under the Long-
shoreman’s and Harbor Worker’s Compensa-
tion Act, U.S. Code (1946) Title 33, Section
901-49.

The owner/operator should carry Bodily
Injury Liability and Property Damage Lia-
bility in sufficient amount to provide the
necessary protection in the event of an acci-
dent.

Additionally, the owner/operator should
carry all Risk Marine Insurance to cover
accidental damage and/or loss to the sub-
mersible.

Insurance coverage for total loss of the
vehicle, though desirable, is not always ob-
tained. Companies such as Perry Submarine
Builders are self-assuring because the cost of
total (hull) coverage would put them out of
the competitive market.

Legal requirements for submersibles of
other nations appear to be essentially the
same as in the U.S.; requirements are up to
the user. Canadian private submersibles
generally seek to attain ABS certification.
The Canadian Armed Forces vehicle (SDL-1)
has received such and operates under its

648

own set of requirements similar to its U.S.
Naval counterparts.

According to Dr. Tadayoshi Sasaki (12),
when design work began on YOMIURI con-
cern was expressed to the Japanese Ministry
of Transportation regarding the lack of rules
and regulations ensuring safety of civilian
submersibles. As a result, in September 1963,
the Inspection and Technical Standards for
Submarine Boats were established as a part
of the Safety Law for Ships (Senpako Anzen
Ho) and YOMIURI was designed and con-
structed in accordance with this law. Sasaki
further stated that this law was partly
amended in September 1966 and is in force
today (1970).

On the other hand, Dr. Tamio Ashino (13),
of Japan Ship’s Machinery Development As-
sociation, defines these regulations as provi-
sional and only deal with the structures,
facilities, and methods for inspection of sub-
mersibles. There are no operator’s qualifica-
tions, but it is necessary to get the approval
of the Ministry of Transportation’s Seamen
Bureau based upon their Section 20, The
Regulation for Crews of Ships. Dr. Ashino
further relates that there is no present pro-
cedure for reporting submersible operations,
but one will be established when the Japa-
nese Maritime Agency attains a rescue capa-
bility.

In the United Kingdom, Lloyds Register of
Shipping has drawn up a set of rules and
regulations for the construction and opera-
tion of submersibles. These regulations are
for insurance purposes (K. R. Haigh, Admi-
ralty Experimental Diving Unit, personal
communication) and serve the same purpose
as ABS classification.

Similar insurance inspection guidelines
were written by Germanischer Lloyd, Ham-
burg, in 1971 and are entitled Regulations
for the Classification and Construction of
Submersibles.

Mr. James Dawson (14) presents an excel-
lent, if not the only, account of submersible
insurance from an underwriter’s viewpoint.
Dawson states, “It is virtually a prerequi-
site to buying insurance to have certifica-
tion from a classification society already
approved by the underwriters . . then in
all probability (the underwriter will) re-
quire an expert consultant’s report and

recommendations before they will actually
quote terms and rates.’ Classification by
ABS, Lloyd’s Register of Shipping and Ger-
manischer Lloyd is acceptable. Interestingly,
Dawson (a member of Lloyd’s of London)
strongly opposes legislation which would ‘po-
lice’ the submersible industry because: 1) the
extraordinary record of safety in the indus-
try is proof of its safety consciousness, and 2)
the concept opens the prospect of certifica-
tion withdrawal for political reasons in order
to protect domestic operations from thrust-
ing exporters.

Information regarding regulations on,
French, Italian or Russian vehicles is not
available.

REFERENCES

1. Glass, C. B. 1969 A Coast Guard role in
civil submersible safety. Soc. Automo-
tive Engineers, Pub. 690027, presented at
the International Automotive Engineer-
ing Congress, Detroit, Mich., 13-17 Jan.
1969.

2. Shumaker, L. A. 1967 Safety Standards
for Deep Submersible Vehicles. Paper
67-819 presented at AIAA 4th Annual
Meeting and Technical Display, Anna-
heim, Calif., Oct. 1967.

3. Pritzlaff, J. A. 1967 Submersible Safety,
Classification Certification and the
Law. Paper 67-WA/UNT-5 presented at
ASME Winter Annual Meeting and En-
ergy System Exposition, Pittsburgh, Pa.,
Nov. 1967.

4. Busby, R. F., Hunt, L. M. and Rainnie,
W.O. 1968 Hazards of the Deep. Ocn.
Ind., v. 3, Nos. 7, 8, & 9, p. 72-77, 32-39,
53-58, respectively.

5. Pollio, J. 1968 Undersea Studies With

649

10.

babe

12:

13.

14.

The Deep Research Vehicle STAR III.
U.S. Naval Oceanographic Office, I.R.
No. 68-103, 71pp.

. Cousteau, J.Y. 1955 Diving through an

undersea avalanche. National Geo-

graphic, p. 5388-542.

. Melson, L. B., Contact 261. U.S. Naval

Inst. Proc., No. 6, v. 93, 1967, p. 26-39.

. Naval Material Command Publication P-

9290 1973 System Certification Proce-
dures and Criteria Manual for Deep

Submergence Systems. U.S. Gov. Printing
Office, Wash., D.C. 20402.

. American Bureau of Shipping 1968

Guide for the Classification of Manned
Submersibles. New York American Bu-
reau of Shipping.

Marine Technology Society 1968 Safety
and Operational Guidelines for Under-
sea Vehicles. Wash., D.C., Marine Tech-
nology Society.

Letich, M. J. 1973 New priorities in
ocean engineering. Proc. Mar. Tech. Soc.
9th Ann. Conf., Sept. 10-12, Wash., D.C.,
p. 401-407.

Sasaki, T. 1970 On underwater observa-
tion vessels in Japan. Trans. 6th Ann.
Conf. & Exhibition, 29 June-1 July 1970,
Mar. Tech. Soc., Wash., D.C., v. 1, p. 227-
PASI

Ashino, T. Manager Promotive Head-
quarters of Oceanic Machinery Dev., Ja-
pan Ship’s Machinery Dev. Assoc., Tokyo,
Personal communication of 25 Dec. 1973.
Dawson, J. W. 1970 Vehicle development
and operations—Europe. Preprints 6th
Ann. Conf. and Exposition, June 29—July
1, Marine Tech. Soc., Wash., D.C., v. 1, p.
263-267.

ad

is

~*~
‘
4
»
-
)
‘
i 5
©)
:
i
e
.
“—_
A '
4
re
7 )
e
é i ¢
@

nee

sic |)
A) derreyh ise a

: i) ,
on?
9
i
‘att
i
ey tL
; i
°
se ' a @ ® iti

ail

@ a a) i
—_ ‘2
uliee ime bans, die

ge

bah@qaygt wet 7

7 7 7

EMERGENCY DEVICES AND

PROCEDURES

There are three basic categories of emer-
gency-related devices and procedures: 1)
Those designed to avoid emergency situa-
tions; 2) those designed to extricate the vehi-
cle from a submerged emergency and to as-
sist in resolving a surfaced emergency; and
3) those designed to assist rescue operations
when the vehicle’s own emergency alterna-
tives fail.

Table 14.1 presents the variety of re-
sponses each vehicle has at its disposal, and
it is accurate insofar as built-in systems
(weight-drops, ballast blow, hull release,
emergency breathing, etc.) are concerned. It
seems reasonable to assume that flashlights
and fire extinguishers are carried by all; the
same assumption may be incorrect where

651

anchors and flares are concerned. The U.S.
Coast Guard requires that life preservers,
running lights, an anchor light and fire ex-
tinguisher be carried; this may be considered
as the minimal safety/emergency equipment
on all U.S. submersibles.

EMERGENCY AVOIDANCE
SYSTEMS

Devices and instruments carried on sub-
mersibles to avoid and warn of potential
emergency situations are presented in Table
14.2. Two factors critical to avoiding emer-
gencies are not included: a pre-dive checkoff
list and sound judgement. The former, if
thorough and followed, can prevent a great

TABLE 14.1 SUBMERSIBLE EMERGENCY SYSTEMS AND DEVICES

Auto Obsta. Man Pres Releas Closed Bot Ra- Rock Sur Sur
matic Echo cle Atmos. ual Trim Equip. High Hull Person. able Submgd. Circuit Scuba tom Flash: dio ets Inflat. face face Mark- Under External
De- Sound- Avoid. Moni- Weight Ballast Fluid Jetti- Pres. Re: nel Cap- Inflata- Breath- Port Emerg. Ra- Mount. ing Sig- and Hatch Hatch Inflat.Snor- er Water Trans- Ping- Connections Life

UCC ballast er Sonar tors Drop Blow Drop son Blow lease Egress sule bleBag ers able Fixed Power dio UOC Light nal Flares Sail Trunk Bags kel Buoy Lights ponder er Gas Air Elec Rafts

5.

ALL OCEAN

INDUSTRIES . ° 5 O c 5
ALUMINAUT fe ° 5 . . 5 5 ° 6 5 ° 2
ALVIN . . . . . . . . . . . . . . .
AQUARIUS . . . . ° : te ° 4 . 5 <
ARCHIMEDE aq 0 : . . ° 0 . . 5 5 5
ARGYRONETE . - . . . . .
ASHERAH . . 6 8 . 5 5 . 2 0 5
AUGUSTE

PICCARD . . D 5 5 .
BEAVER . . . 5 5 0 5c 0. 0 0 4 & & i ee
BEN FRANKLIN «ees . ° 7 6 O 2 5 6 6 6 a G ag o 4
BENTHOS V . . C c
DEEP DIVER : . . = O 5 5 5 2 8 5 co °
DEEP JEEP . 2 is . 0 Gi 5 c 5 o 0 .
DEEP QUEST . . . . . . . . . . . 5 a . . .
DEEPSTAR 2000 . . . . o 9 é Go 5 . . .
DEEPSTAR 4000 Oo 6 . =) fe . oe ° tte 5 5 5 5 5 °
DEEPSTAR 20000 . . . o wees oO .6 ste ‘
DEEP VIEW . . 5 . eee) C 5 oO 4 5 . 5
pows . . GAG 5 5 o a 6 5 7 5
DSRV-+1 : ° - ° Do 5 yo 6 50 Serio
DSRV-2 - . . . . . . . . . o 0 . . .
FNRS-2 . : . * 5 6
FNAS-3 Soi . ° . G < a .
GOLOFISH . . ° 5 fa 5
GRIFFON .
GuPPY . . 5 “ 5 O 5 .
HAKUYO . . . . . . . . . . . .
HIKINO . .
JOHNSON SEA LINK *
KUMUKAHI . . . . . . .
KUROSHIO II - - . - ; a as
MAKAKAI . . . . . . . . .
MERMAID I/II eat tO 5 c 5 . - a o
MERMAID III/IV sh nae. . . . . . 5 - is
MINI DIVER : . A 5 .
NAUTILETTE . 5 3 + 5
NEKTON ALPHA . 5 o 6 2 a 6 . 5 o 5 G6 6 10
NEKTON BETA . - . ° o oO 5 5 5 5 o oo o
NEKTON GAMMA . . ° 3 - o © 5 5 o 5 GO oo 2
NEMO . oe HO OO C 2
NEREID 330 . . . : . 5 5
NEREID 700 : . . . . D =
oPsus
PAULO 1 . ° e ° 5 5 =
PC-3A1 e 5 5 5 é 4 : D o
PC-3A2 - . . . . c c © O
PC3-X . . ° . : 5 .
PC5C . . . . . . . . . .
PCB O
PISCES | . o 5 2 . 5 4 4 - ° .
PISCES II . ° ite c 6 6 c < 6 5
PISCES III . . ee 5 SG + 3 5 o
PISCES IV . . . 5 : 5 6 5 ° 5 O
PISCES V . 5 o > . ie 5 . 5 .
PISCES VI . 5 c 5 . 5 6 o . e .
SDL . . “ 4 ° . C C c O c Aes
SEA CLIFF . 5 : . oh te é . > 6 5 5
SEA LINK . 5 5 . oY to ; 2 O G a -o
SEA OTTER . 5 ° . 3 . . se °
SEA-RAY . e 5 5 6 .
SEA RANGER . oO ° . .
SHELF DIVER . ° . . Oo oO 5 chore 5 0
SHINKAL . . . . . . . . . . . . . . . .
SNOOPER . ° a 5 < 5 5
SP-350 . . . . . . . . .
SP-500 . . . . . . . . . . . .
SP-500 . - . . . . . . . . . .
sP-3000 . ° ne ° a tS 5 . oierey, ofa) 5 3 5 .
SPORTSMAN 300 . 5 ° . 2
SPORTSMAN 600 ° ° 5 . =
STAR I ° © ae ° oinints 5 ° . .
STAR II . . ° 5 c Clg Aas 5 > 5 .
STAR III of ks . ° ° ° . pti eo LG 5 ate 5 5
SUBMANAUT

(Helle) . e ° oars
SUBMANAUT . . 5 ° ° O
SUBMARAY . . . . 5 6 6 0 . a) ip
SURV . ° . . 5 O . .
SURVEY SUB . ° ce vs . e . 5 . 5 5 A so
TECHDIVER . . om ls 5 . . ° 5 5 5 5 .
TOURS Cio 6 5 . . 5 ° i oe 6 . Se desc
TOURS eo) fet hs . 5 . 5 ° Sy, ely 5 mo
TRIESTE - rT ° 5 2 5 3
TREISTE I ee sik Fis) : 5 5 . . 5 5

652

TABLE 14.1 SUBMERSIBLE EMERGENCY SYSTEMS AND DEVICES (Cont.)

Auto Obsta Man Pres Closed Bot

Releas
matic Echo cle Atmos.
De- Sound: Avoid. Moni

UOC ballast

val Trim Equip. High Hull Person
Weight Ballast Fluid Jeti. Pres. Re- nei
er Sonar tors Drop Blow Drop son

TUDLIK
TURTLE
VAST MK II (K-250)
VIPER FISH

(PS-2)

VOL-L

able Submgd. Circuit Scuba
Cap- Inflata- Breath: Port
Blow lease Egress sule ble Bag

Ra- Rock Sur Sur

Inflat. face face Mark- Under
Emerg. Ra- Mount. ing Sig- and Hatch Hatch Inflat. Snor- er Water Trans- Ping Connections Lite
ers able Fixed Power dio UQC Light nal Flares Sail Trunk Bags kel Buoy Lights ponder er Gas Air Elec Rafts

External

YOMIURI : . . . . : . ‘ A

TABLE 14.2 EMERGENCY AVOIDANCE SYSTEMS

Contingency

Exceeding Operational Depth

Impact With Bottom
Obstacles To Maneuvering
Life Support Failures

Deteriorating Surface Conditions
Surface Traffic

Separation From Surface Ship

Faulty Life Support

deal of the operational problems which ac-
company submersibles; the latter, if em-
ployed, is the best asset the operator has to
avoid situations wherein emergency meas-
ures must be executed. Assisting the opera-
tor are a number of devices to counteract
potential emergencies; these will be dis-
cussed briefly under the nature of the emer-
gency. In some instances one instrument
may serve to avoid or counteract more than

Avoidance Systems

Depth Gage

Automatic Deballasting Devices:
Weight Drop
Ballast Blow

Surface Buoy

Echo Sounder
Obstacle Avoidance Sonar
Atmospheric Monitoring Devices

Underwater Telephone

Pinger

Transponder
Underwater Telephone
Surface Buoy

Monitors: 0,,CO,, Pressure (Cabin), CO, Trace Contaminants

one kind of emergency: Thus the apparent
duplication in Tables 14.2 through 14.4.

Exceeding Operational Depth

Depth Gages:

Pressure-sensitive depth gages are availa-
ble with accuracies up to +0.05 percent of
full scale range. Most submersibles include a
safety factor of 1.5 on all pressure-resistant

653

TABLE 14.3 EMERGENCY CORRECTIVE SYSTEMS (SUBMERGED)

Emergency

Loss of Normal Surfacing Ability

Entanglement

Pressure Hull Flooding

Fire

Elimination of Noxious/Toxic Gasses

Loss of Normal Life Support

Loss of Electrical Power

Corrective Systems

Weight Drop

Hand Pump Deballasting
Trim Fluid Dump

Equipment Jettison

High Pressure Deballasting
Pressure Hull Release
Personnel Egress

Releaseable Personnel Capsule
Inflatable Bag

Equipment Jettison

Pressure Hull Release

Releaseable Personnel Capsule
Personnel Egress

Emergency/Normal Ascent Procedure

Emergency/Normal Ascent Procedures
High Pressure Air Blow or Pump

Fire Extinguisher

Emergency Breathers
Emergency/Normal Ascent Procedures

Closed Circuit Breathers

Open Circuit Breathers

Chlorate Candles

Emergency/Normal Ascent Procedures

Emergency (Internal) Batteries
Automatic Weight Drop (Fail-Safe)
Flashlights

Non-Electrical Ascent

TABLE 14.4 EMERGENCY CORRECTIVE/ASSISTANCE SYSTEMS (SURFACED)

Emergency

Separated from Support Craft

Breathing Gasses Expired

components. In this situation the inaccuracy
of the depth gage is more than offset by the
liberal safety factor. For example, if a vehi-
cle’s operating depth is 1,000 feet, a safety
factor of 1.5 allows 1,500 feet before reaching
collapse depth. At 1,000 feet a pressure gage
reading within +50 feet of that depth is well
within the vehicle’s ability, not only to sur-
vive, but to function routinely.

Automatic Deballasting Devices:

Two procedures are incorporated on sev-
eral submersibles which automatically func-
tion to provide positive buoyancy if it pro-
ceeds beyond operational depth. One system
(DS-4000) automatically drops a weight be-
yond 4,400 feet; on STAR III the same proce-
dure is available, but only if the high pres-
sure air system (used to deballast the main
ballast tanks) falls below a critical pressure
level (185 psi below ambient pressure). In
other vehicles (BEN FRANKLIN, SHINKAI,
MERMAID I/II and the TOURS series) a
pressure sensing device activates blowing
the main ballast tanks if the vehicle jour-
neys below operational depth. The remaining
submersibles with automatic deballasting in
Table 14.1 drop iron shot when electrical
power fails regardless of depth. The TOURS
vehicles constitute a special case whereby

655

Instruments

Radio

Underwater Telephone
Flashing Light

Radio Signal

Distress Rockets
Flares

Anchor

Open Hatch (Sail Allowing)

Inflatable Trunk Around Hatch
Inflatable Bags (Increase Freeboard)
Snorkel

External Gas Replenishment Connections

automatic deballasting occurs not only below
operating depth, but every 13 minutes at any
depth unless the operator takes preventative
action. The drawbacks of such systems are:
1) They are governed by the accuracy of the
activating mechanism’s sensing device; and
2) they do not take into consideration all
possible operating situations. Let us imagine
that DEEPSTAR 4000, for example, is work-
ing at its operational depth underneath an
overhanging cliff or cable and inadvertently
exceeds 4,000 feet. Automatic deballasting
might send it up into the very hazard it
wished to avoid. The timed deballasting in
the TOURS vehicle opens the door for
greater susceptibility to overhead hazards
and untimely surfacing and detracts from
operator efficiency because he must now con-
centrate not only on the job at hand, but
keep track of time as well.

Buoys:

In the early days of submersibles it was
considered a safe practice to tie a large buoy
on the vehicle with a length of line that
would, in addition to facilitating tracking,
prohibit the vehicle from exceeding its opera-
tional depth. The pitfalls of this practice
became evident before the safety line inex-
tricably snarled on an obstruction and

trapped the vehicle below. One major advan-
tage that submersibles—like the scuba di-
ver—enjoy is maneuverability. To restrict
this maneuverability may place it in greater
jeopardy than is the chance of going below
operational depth. It should be noted, how-
ever, that the Japanese KUROSHIO I & II
have conducted safe dives for well over a
decade with a power cable tethered to a
surface ship. Undoubtedly, this safety record
is the result of careful planning and investi-
gation of the dive sites to assure that noth-
ing is present to foul the cable.

Impact With Bottom

Owing to the inherent inaccuracies in
depth gages and precise depth values at the
dive site, many vehicles include a device
which informs the operator of his distance
off the bottom. In addition to supplying data
useful to performance of missions, such de-
vices afford the operator the opportunity to
avoid striking the bottom on descent and
damaging critical components. Conventional
echo sounders serve this purpose and include

a transducer mounted on the vehicle’s keel
and a depth display device in the pressure
hull. The internal display is either a strip
chart recorder or a flashing light. Either
display is adequate, but the strip chart pro-
vides a permanent record which is invalua-
ble to various surveying or research tasks.
Regardless of the sensing device employed,
one may expect some inadvertent contact
with the bottom as the underside of DS-4000
(Fig. 14.1) testifies.

Obstacles to Maneuvering

Underwater visibility may range from sev-
eral hundred feet (Fig. 14.2) to a few feet—
the former being common to shallow tropic
and sub-tropic waters and in the arctic and
antarctic, while the latter is found through-
out the estuarine, coastal and open ocean
temperate waters. The lack of usable am-
bient light for visual observations below a
few hundred feet requires artificial lighting.
This may provide 50 to 70 feet of viewing
distance, depending on water clarity. Conse-
quently, many submersibles carry a sonic

Fig. 14.1 Scratches on the underside of DEEPSTAR 4000 testify to the frequency of inadvertent bottoming in submersibles. (NAVOCEANO)

Fig. 14.2 Unusually long range visibility is shown from this camera and a line of targets, 4-liter bottles spaced 10 feet apart, photographed at a depth of 600 feet under ambient light
off Key West Florida from STAR /il. The depth of field exceeds 100 feet and horizontal visibility was estimated at over 200 feet. (NAVOCEANO)

device to warn of obstacles in their line of
flight—e.g., cliffs, wrecks, cables, etc.—be-
yond the limits of visibility. Two approaches
to obstacle avoidance have been taken: The
first incorporates a conventional echo soun-
der transducer mounted on the bow and look-
ing directly forward; the second involves a
horizontally trainable transducer mounted
forward and atop the vehicle which operates
similar to radar and displays targets on a
cathode ray tube scope inside the vehicle and
which provides range and relative bearing of
a target from the submersible (Fig. 14.3). A
number of companies produce this latter sys-
tem. The Straza Model 500 CTFM Sonar is on
several submersibles and its range is from 10

657

to 1,500 yards. Both the forward-looking echo
sounder and the CTFM have served admira-
bly; the characteristics of these are dis-
cussed in Chapter 10. From a safety view-
point, none have demonstrated an advantage
over the other.

Life Support Monitors

Most, but not all, submersibles carry auto-
matic or manual devices to measure pressure
hull oxygen and carbon dioxide content. The
manual devices are easily obtainable off-the-
shelf instruments, the automatic devices are
also stock items but more expensive. The
general practice is to take or observe cabin
oxygen and carbon dioxide content at peri-

Fig. 14.3 ALUMINAUT’s CTFM sonar traces of a box canyon at 800 feet deep off
Vieques Island, Puerto Rico. (NAVOCEANO)

odic intervals. No reported emergencies have
evolved through this procedure in the his-
tory of submersible diving. Most submers-
ibles do not dive for much longer than 8
hours, which may account for this high
safety record. On long duration dives, e.g.,
BEN FRANKLIN’s 30-day Gulf Stream Drift,
automatic monitoring and warning devices
may be more advantageous in view of opera-
tor fatigue or involvement with other duties.
Included within the life support monitoring
devices on several submersibles are those
which measure internal pressure and trace
contaminants. An aircraft altimeter or ba-
rometer is quite often used to serve the first
function, and portable testing kits are avail-
able to measure trace contaminants.

Surface Traffic and Inclement
Weather

It is impossible for the submersible’s pilot
to assess surface traffic conditions prior to
surfacing. In the open sea the chance of
surfacing under or within the path of an
oncoming vessel is quite slim, but in water-
ways or coastal traffic lanes it is considera-
ble. While an upward viewing capability in
the submersible might exist, it is not always
possible to stop the submersible during as-
cent and lack of water clarity might preclude

658

visual observations. Surface weather condi-
tions can deteriorate during a 6- to 8-hour
dive and generate a sea state in excess of
that considered safe for retrieval. Some
ocean areas, the Santa Barbara Channel for
example, are subject to rapid weather
changes which can close in on a dive site
with little advance notice. The only safe-
guard against both potential hazards (traffic
and sea state) is a surface tending craft
capable of communication with the submers-
ible. As a general operating procedure, the
surface vessel has the ultimate control re-
garding safe and timely surfacing. Though
the likelihood of collision with a military
submarine or another submersible is slim,
communication between two underwater ve-
hicles may be carried out providing the fre-
quencies of both telephones are the same.
There is no standard frequency for underwa-
ter telephones, and they have ranged from 8
kHz to 100 kHz. Purely by chance, 8.0875 kHz
is found on a great number of vehicles. This
is the frequency selected for the first Naval
underwater telephone and designated as AN/
UQC and is used on U.S. Navy submarines.
The reason for the choice of 8 kHz on small
submersibles is simply that it was all that
was commercially available in the fifties and
early sixties. Now, a number of different
models and frequencies are available and
can be found on various submersibles. From
a safety/rescue point of view, it is advisable
that the operator includes a carrier fre-
quency of 8.0875 kHz because it is compatible
with the majority of his sister vehicles and
all U.S. Naval potential rescuers.

Separation From Surface Ship

For a number of reasons (retrieval, surfac-
ing, rescue) the surface support craft must
know the submersible’s position relative to
itself. Several methods are available and are
discussed at length in Chapter 10.

Pingers:

Self-powered acoustic pingers may be
mounted on top of the vehicle which emit an
acoustic impulse every 2 seconds or less.
With a frequency compatible listening device
(hydrophone) the surface ship stays over the
submersible during its dive by assessing the
strength of the incoming signal. By carrying

an appropriate hydrophone, the support
craft may also determine the submersible’s
bearing relative to itself and may elect to lay
off from the vehicle rather than stay directly
overhead.

Transponder:

Attached to the submersible’s topside, the
transponder is an automated receiver/trans-
mitter which transmits an acoustic signal
when interrogated by the surface craft. By
accurately timing the interval between the
outgoing and incoming signals, the 2-way
slant range between support ship and sub-
mersible can be computed, and, by knowing
the submersible’s depth, the horizontal dis-
tance from one to the other may be derived.
By increasing or decreasing this distance,
the support craft can maintain its desired
position relative to the submersible.

Underwater Telephone:

The submersible’s underwater telephone
can function as a transponder when a
“mark” signal from the surface is answered
by “mark” from the submersible. By timing
the interval between the surface mark and
sub-surface return mark the slant range is
calculated. Similarly, by transmitting peri-
odic impulses the telephone may function as
a pinger.

Buoys:

The towing of a surface buoy has been
discussed previously. It is sufficient to note
that some shallow vehicles are tracked from
the surface by towing a surface float.

EMERGENCY CORRECTIVE
SYSTEMS (SUBMERGED)

In the event of a submerged emergency,
the operator may have several options. The
nature of different emergencies and the var-
ious options are shown in Table 14.3 and
discussed below.

Loss of Normal Surfacing Ability
Submersibles surface through a variety of
procedures: They may power up, drop
weights or blow ballast. In the event that
none of the normal procedures operate, other
options are available to the occupants for

regaining the surface either with or without
the submersible.

Weight Drop:

The most widespread emergency surfacing
procedure is the dropping of a lead or steel
weight attached to the submersible’s keel
(Fig. 14.4). Depending on the submersible,

Fig. 14.4 The 200-Ib lead weight (top) on SEA OTTER's keel is manually dropped by
a ‘T’ bar wrench (bottom) from in the hull. Both ends of the weight are recessed and
indexed into the keel to assure it will not rotate while being unscrewed

the weight will vary, but the method of jetti-
soning is either by mechanically turning a
thru-hull releasing shaft or by electrically or
hydraulically actuating a release mecha-
nism. In the latter procedure the electrical
power is derived from emergency batteries
within the pressure hull. In some cases an
electrically-actuated (explosive) device may
serve as the release mechanism by cutting a
restraining cable or the like.

Equipment Jettison:

To attain the same results as a weight
drop, equipment such as batteries, mechani-
cal arms, motors and the like can be jetti-
soned to lighten the vehicle. This procedure
is generally secondary to a weight drop be-
cause of the high cost of such equipment.

Trim Fluid Drop:

Those submersibles which use mercury to
attain bow trim (pitch) angles or roll (list)
angles also incorporate a method of dumping
the mercury in extremis. In the event that
the submersible rests at such an angle that a
gravity dump is not effective, it may—as
does DEEPSTAR 4000—carry a reservoir of
compressed nitrogen which can force the
mercury out of the reservoir. In considera-
tion of the pollution aspects of mercury, the
U.S. Navy is presently working on an alter-
native to mercury as a trim fluid and has, for
the interim, made mercury dumping from its
vehicles impossible.

High Pressure Ballast Tank Blow:

Submersibles’ main ballast tanks are used
to achieve surface freeboard and are emptied
of water by compressed air. Consequently,
low pressure air is all that is required for
blowing ballast on the surface. As an emer-
gency feature, in addition to normal variable
ballast tank control, a number of vehicles
carry high pressure air to blow the main
ballast tanks empty and lighten the vehicle
for surfacing from operating depth. This is a
common emergency feature on the shallow-
diving submersibles and is found on some of
the deeper vehicles (e.g., ALUMINAUT).

Manual Deballasting:

As a backup to the above deballasting
procedure, a few vehicles include a hand
pump in the pressure hull which can be used

to evacuate water from the ballast tanks if
the air blow system malfunctions.

Personnel Egress:

More than a third of past and present sub-
mersibles incorporate procedures to allow
the occupants to exit the vehicle when all
else fails to bring it to the surface. In theory
the procedures are simple and fall into two
categories: 1) Pressurizing the hull with com-
pressed air from the ballast blow tanks until
internal air pressure equals ambient water
pressure, which allows the occupants to open
the hatch, flood the hull, leave and ascend to
the surface; and 2) opening a thru-hull valve
to allow seawater into the hull until it com-
presses the air in the hull to a point where it
(the air) is equal to ambient pressure and
allows the occupants to open the hatch and
swim to the surface (in some vehicles both
systems may be used concurrently). In lock-
out submersibles the egress hatch is in the
bottom of the vehicle and it is not necessary
to flood the hull for exiting when internal
pressure is equal to ambient (Fig. 14.5).

Fig. 14.5 Divers approaching the lock-out hatch of BEAVER. Air pressure in the aft
sphere is equal to water pressure and prohibits entrance of seawater. (North
American Rockwell)

Whatever the procedure followed, the suc-
cessful practitioner must maintain excep-
tional calm as his haven fills with water and
he contemplates a swim to the surface. The
disadvantages of this procedure are de-
compression sickness, nitrogen narcosis, oxy-
gen poisoning, cold and panic. Successful sys-
tems must offer quick pressurization, sim-
plicity, protection from cold water and a
buoyancy device to assist ascent.

The British Royal Navy has developed
buoyant ascent escape techniques to the
point where test escapes from a military
submarine have been accomplished from 600
feet deep. Commander M. R. Todd, R.N., (1)
estimates that 740 feet is certainly attaina-
ble, and deeper than this is a likelihood.
Because it is the most successful and ad-
vanced personnel escape system in the
world, wherein the occupants enter the
water, Todd’s description of the British sys-
tem (Fig. 14.6) may serve as a basis for
comparison against the systems used in sub-
mersibles.

“It (the escape system) consists of a Sin-
gle Escape Tower at both ends of the
submarine, each fitted with the Hood
Inflation System (HIS) and used in con-
junction with the Submarine Escape Im-
mersion Suite Mark 6 or 7. The Escaper
enters the tower through the lower hatch
and connects his suit to the Hood
Inflation System with a simple push-in
plug. Through this he receives pure air
at 1 psi above ambient. The lower hatch
is then shut and the tower is flooded
from the sea. (The last man can complete
these actions by himself). The pressure in
the tower is then doubled every 4 to 16
atms in 16 seconds. The tower is cali-
brated to achieve this pressurization rate
at any depth without adjustment or ac-
tion by the escapers. During this phase of
the escape cycle the HIS supplies air at 1
psi more than ambient, first inflating the
stole, or lifejacket, built into the suit,
and then, through two '/2 psi relief
valves, the hood. However fast the pres-
sure builds up in the tower the hood
remains inflated to provide the escaper
with a comfortable air lock from which
to fill his lungs. Without thought or ac-
tion he gets as much air as he needs and

oniy wastes the slight overflow from the
open bottom of the hood.

When the tower pressure equals that of
the sea, the upper hatch opens. Because
this is all that has been keeping the
escaper in the tower, he starts his ascent
and the air connection disengages, both
parts sealing automatically as they sepa-
rate. Bottom time is under three seconds.
The ascent is completed at 8.5 feet per
second and the escaper breathes nor-
mally all the way. By doing this he
ensures that his lungs are at the same
pressure as that in the hood and there-
fore the sea, because the hood is open at
the bottom.

On arrival at the surface the hood is
removed and the suit starts its next task
of protecting the escaper from exposure
or drowning.”

—Todd (1)

Now, let us look at the escape procedures
for two manned submersibles, BEN FRANK-
LIN and STAR IIT.

a) BEN FRANKLIN:

This escape procedure assumes that any
escape will involve depths where decompres-
sion times will extend beyond the endurance
of the Draeger FGG III. This procedure fur-
ther assumes that a Personnel Transfer Cap-
sule (see the SRC in Chap. 15) will be ready
to accept escaping personnel in the immedi-
ate vicinity of the after hatch.

1. Rig hatch skirt.
2. Make decision on use of life raft.
3. Turn on all battery powered lan-

terns.

4. Conduct final surface communica-
tions.

5. Place mode switch in zero mode
(OFF).

6. All hands don life vests.

7. All hands don breathing rigs.

8. Remove all main power fuses.

9. Short exterior fuse clips to blow exte-
rior fuses.

10. Undog after hatch.

11. Flood boat as fast as possible via
variable ballast tank inboard vents
and SAS vent. Secure flooding when
water level is just about skirt lip. All

y” . | HATCH STOP
PRESSURE TIGHT Went

ee

) SALT WATER BATTERY 4 ~~ ¥ =< HINGE SHAFT,

SENSING LINE oe
x ‘ q ~FAIRING PLATE
TOWER VENT ie: wt

FLOOD VALVE
FLOOD DEFLECTOR
“LAST MAN’ FLOOD LEVER

a -
PO Reeee

STOLE CHARGING VALVE

H.1.S. CONTROLLER rae

HOOD VENT APERTURE

ama

SUPPLY FROM H.LS.

REDUCING VALVE
TO H.E.S
CONTROLLER

—

jE he.
< s a,

Fig. 14.6 The Royal Navy's Hood Inflation System and Submarine Immersion Suit Mark 7. (K.R. Haigh, A.U.W.E.)

662

hands must be on breathing rig at
the start of flooding. Use of Plankton
Sampler can vastly speed flooding.
Release guide line.

Await signal from PTC before at-
tempting to exit.

Upon signal from PTC, exit and swim
or follow line to the PTC. Be pre-
pared to ditch gear before entering
PTC if requested by the PTC escort.
In the event that the signal under item 13
may not be readily communicated by the
PTC escort, he may elect to make a series of
three taps in quick succession repeated at
intervals as necessary to assure receipt will
constitute an exit instruction.

—Gulf Stream Drift Mission Plan,
May, 1969

25
13.

14.

b) STAR IIT:

The procedure is based upon escape from a
maximum of 300 feet. All tables and times
are based on this depth.

The submersible occupants will notify top-
side when the oxygen pressure gage reads
100 psi. This shows that there is 1 hour of
oxygen life support left. Topside will make
ready, standing by with personnel at lookout
stations and divers and gear ready to assist
the submersible occupants when they reach
the surface.

The submersible occupants will make use
of the following items: Each occupant will
don a Navy-type emergency ascent Steinkie
Hood, but will not place the hood over his
head.

Emergency breathing regulators will be
made ready before the start of flooding the
sphere.

The air line (a flexible hose and valve to
inflate life vests as the sphere is being
flooded) will be made ready. Face masks will
be made ready to use prior to flooding. The
hatch handle removal gear used to push out
the hatch handle shaft, underwater flash-
lights, and all other tools necessary to re-
move existing gear will be available to the
pilot.

After all gear is ready, the following emer-
gency procedure will be carried out:

1. A briefing to the observer on how to
make the emergency escape.
2. Make final communications with top-

663

side informing them that you are
ready to start emergency escape pro-
cedures to flood the sphere.

3. Remove the hatch dogging gear and
install hatch shaft pin removal gear.

4. Secure all electrical power and re-
move electrical power emergency
E.O. plug. (This eliminates all electri-
cal power to the sphere.)

5. The air hose to inflate hoods shall be
readily available to the pilot.

6. Don Steinkie Hood and pressurize
units for breathing.

7. Open the water sampling line on the
sea manifold to start flooding.

8. Remove hatch shaft pin using re-
moval gear. When the pin is removed
and water starts to enter, both pilot
and observer will position them-
selves in a sitting position during
flooding. An underwater light will be
strapped to each occupant.

9. In the first minute during flooding,
the sphere will change pressure by 1
atmosphere, (33 ft 14.7 psi + the
original atmosphere in the sphere be-
fore flooding, totalling approximately
29 psi). Approximate time to fully
flood sphere is about 4 minutes.

NOTE: As pressure in the sphere builds
up, the pilot and observer must
replenish air to the Steinkie
Hoods. The hoods would be com-
pletely deflated after an external
pressure of 45 psi. The pressure to
the hoods must be maintained to
permit proper breathing.

10. The pilot and observer will maintain

physical contact at all times.

When the sphere is full enough to permit the
pilot to open the hatch, he will do so and he
will then open the sail hatch. The observer
will exit first, when he is outside the sub-
mersible, he will grab hold of the handrail
and wait for the pilot to exit. Before the pilot
and observer start their ascent to the sur-
face, they will fully inhale, fully exhale, and
on the fully exhale they will let go of the
handrail and, keeping their lungs as deflated
as possible, keep shouting HO-HO-HO all the
way to the surface.

—STAR III Operations Manual, Jan. 1968

One point emphasized in both the BEN
FRANKLIN and STAR IIT emergency proce-
dures is that personnel egress is the very
last option and should not be attempted until
all other options have proven futile. This
warning is for very sound reasons and is
based on the fact that the decision to flood
and exit the submersible opens the door for a

INTERNAL VOLUME FLOODED-FT?

variety of fatal potentials in which de-
compression sickness, nitrogen narcosis and
drowning predominate. The STAR III man-
ual presents the graph shown in Figure 14.7
which is the time it would take to flood the
pressure sphere to the point where the inter-
nal air pressure equals ambient water pres-
sure. This time (bottom time) is critical for

INTERNAL & EXTERNAL
PRESSURE EQUALIZED

90 100 110 120 130 140 150 160

TIME—SECONDS

Fig. 14.7 Curve showing the time it would take to flood STAR III's 5.5-ft ID hull and pressure within the hull as a function of
time at 300 feet deep through a 3/4-inch-diameter hole.

664

decompression and extending it beyond spec-
ified time limits (see U.S. Navy Diving Man-
ual) at specific depths can be fatal to the
occupants if decompression facilities are not
available. The British system owes its suc-
cess to short bottom time, extreme simplicity
and protection from cold, among other
things. The procedures from manned sub-
mersibles offer few, if any, of these advan-
tages. For this reason, leaving the submers-
ible is a last resort.

Pressure Hull Release:

The U.S. Navy submersibles ALVIN, SEA
CLIFF, TURTLE and MAKAKAI are so con-
structed that the pressure hull (sphere) may
be mechanically disengaged from the exo-
structure and, by virtue of its positive buoy-
ancy, carry the occupants to the surface. The
principle of operation is similar in all of these
vehicles, and the description of ALVIN’s re-
lease mechanism (Mavor et al. (2)) is repre-
sentative. ALVIN was designed in two sec-
tions, the forebody and the afterbody. The
forebody includes the personnel sphere, the
conning tower, the main ballast system, an
emergency battery supply and all the life-
support equipment. It is buoyant by some
800-900 pounds. The remainder of the vehicle
comprises the afterbody.

The frame of the afterbody was designed to
protrude underneath the pressure hull and
provide a cradle for it. When in “neutral
trim,” the afterbody is negatively buoyant
by the same amount that the forebody is
positively buoyant. A mechanical release
mechanism holds the two sections together
and is in tension when submerged. On deck
the mechanism is relaxed and the forebody
rests in the cradle of the afterbody.

The release mechanism consists of a shaft,
a seal assembly, two spring-loaded dogs and
two hooks. The dogs are part of the afterbody
and the hooks are rigidly attached to the
pressure hull. The shaft penetrates the pres-
sure hull on bottom dead center. When the
shaft is turned with a suitable wrench it
rotates a cam which, at one-quarter turn
allows the dogs to come together and disen-
gage the hooks. The forebody is then free to
rise to the surface with the occupants (Fig.
14.8).

The position of the sphere upon reaching
the surface is speculative. Shallow water

665

tests (18 ft) under controlled conditions were
conducted and ALVIN’s sphere reached the
surface with the sail up and the hatch could
have been opened by the occupants without
flooding, but from a 12,000-foot ascent, the
drag on the sail could produce a surfaced
stable condition with the hatch down.

Releasable Capsule:

Similar in effect to ALVIN’s releasable
pressure hull are the releasable spheres on
the uncompleted French ARGYRONETE and
the Japanese SHINKAI. Atop ARGYRO-
NETE’s hull and over the main hatch is a
2.28-meter-diameter steel sphere capable of
accommodating the entire crew of 10 (Fig.
14.9). Once the occupants are inside, the
sphere is released by them to rise to the
surface. In ARGYRONETE an inflatable
trunk surrounds the sphere hatch and af-
fords protection from the sea.

Inflatable Bag:

Two submersibles (PC5C and TECH-
DIVER) offer as optional features emergency
bags external to the hull and inflatable by
carbon dioxide. These bags may be inflated
automatically or manually. In TECHDIVER
the bag capacity is 40 cubic feet.

Entanglement

The methods available to the submersible
operator in the event of entanglement de-
pend upon the nature of the object fouled. If

Fig. 14.8 Emergency release of ALVIN's personnel sphere.

RESCUE CAPSULE

VIEW PORT

Fig. 14.9 Schematic of the Japanese submersible SHINKAI showing location of releasable rescue capsule.

the entangled object is light enough to be
carried to the surface, then the vehicle’s
normal or emergency deballasting proce-
dures may be used. If this is not the case,
then the procedures under Loss of Normal
Surfacing Ability must be employed, i.e., jet-
tison the fouled component, release the pres-
sure hull or emergency capsule or egress the
vehicle. In addition, if life support endurance
is sufficient, assistance from the surface
craft or other submersibles is also included
in the arsenal of emergency procedures. The
first line of defense against entanglement is
a smoothly faired vehicle. If there must be
items which could snag objects they should
be jettisonable.

Flooding

Flooding of a submersible may occur in
compartments, other than the pressure hull,
which are also critical to safety. Critical com-
partments are the battery pods, main and
variable ballast tanks and motor and other
component housings. Detection of flooding is
accomplished, for example, by installing self-
powered twin electrode systems that set off
an alarm when seawater completes the cir-
cuit between the electrodes. On the Perry-
built submersibles such sensors are located
fore and aft in the battery pods and consist
of twin electrodes mounted within a polyvi-

666

nyl chloride (PVC) tube, with each unit being
powered by its own 9-volt battery. When
flooding occurs both a visual (light) and an
audio alarm are activated to inform the pilot.
Flooding within the pressure hull is detected
visually by the occupants and, in the small
confines of submersibles, does not go unde-
tected. Depending on the location, nature
and extent of the flooding, the standard pro-
cedure is to surface. If flooding of the pres-
sure hull is severe, every emergency debal-
lasting system available may be used to sur-
face and decrease the pressure differential
across the leaking area. Several Perry-built
boats, to counteract flooding, carry a trim
pump within the pressure hull that pumps
water out of the hull through an overboard
dump valve.

All leaks are not necessarily emergency
situations. BEN FRANKLIN, for example,
took water aboard when drifting between 600
and 700 feet during its entire 30-day drift in
the Gulf Stream. The leak was between the
housing of an electrical penetrator and the
hull and amounted to no more than an occa-
sional drop of seawater. During its deeper
(1,500-ft) excursions the increased external
pressure squeezed the housing and penetra-
tor together and the leak ceased.

As a flooding control method, SEA
RANGER 600 provides for the introduction

of high pressure air into the pressure hull.
This procedure would seem inadvisable un-
less the submersible can make a very rapid
ascent to the surface to relieve internal pres-
sure and avoid decompression sickness. Con-
versely, too-rapid an ascent might produce
an air embolism in the occupants.

Fire

The principal type of fire anticipated in a
submersible is an electrical fire. For this
reason, one or several dry chemical type
extinguishers are carried; these do not pro-
duce large quantities of toxic gasses or va-
pors and their effect is minimal on adjacent
equipment. When such extinguishers are em-
ployed the occupants, for additional safety,
are advised to don their emergency breath-
ing systems.

Loss of Normal Life Support/Toxic
and Noxious Gasses

In the event that a submersible’s life sup-
port system fails, or expires, or gasses and
fumes evolve which are harmful to the occu-
pants, the response is the same in both
cases: Employ the emergency breathing de-
vices and surface as quickly as necessary.
There is, as can be expected, a gray area
between the time life support fails or noxious
gasses are detected and the decision is made
to don the emergency equipment. For exam-
ple, if the blower unit which forces cabin air
through a carbon dioxide removal system
fails, the submersible may be at a depth
where routine surfacing and retrieval can be
accomplished before the need of emergency
breathing arises. In an actual case, a buildup
of carbon monoxide was detected in BEN
FRANKLIN in the first stages of its 30-day
drift mission. Though carbon monoxide is a
potentially fatal gas in sufficient concentra-
tions and over a given time period, it was
decided that the trip could safely continue
until 50-ppm concentration was reached. The
decision was correct and allowed completion
of the mission with no immediate or long-
term effects on the submersible’s occupants.
On the other hand, the decision may be in-
stantaneously made in the advent of fire,
which is the most likely, but not the only
source for the evolution of noxious or toxic
gasses.

667

Owing to the availability of instruments to
monitor a life support system’s performance,
its failure or inadequacy is relatively easy to
determine. Release of noxious or toxic gasses
is not easily measured because they may
come from a variety of different sources. For
example, when exposed to the atmosphere,
many of the following may lose solvents,
plasticizers and unpolymerized materials by
volatilization:

Surface coatings

Cords of synthetic or natural fibers

Plastic films

Molded and cast plastics

Wire insulation

Thermal insulation

Adhesives

Electronic encapsulation compounds

Silicones and organic lubricants and
fluids

Metallic dust and oxides

Casting compounds

Ozone-emitting electronic and electrical
equipment

Tapes

A direct and visible source of contamina-
tion is from strip chart recorders (e.g., echo
sounders) that burn an imprint on a chemi-
cally treated paper to record data. The chem-
ical composition of the by-product’s fumes
may be unattainable because the paper man-
ufacturer considers the recording paper’s
composition proprietary.

A variety of emergency breathing systems
are used in submersibles, but they basically
fall into two categories: Open circuit and
closed circuit.

Open-Circuit Breathing:

These systems are termed open-circuit be-
cause the occupants inhale directly from the
gas supply and each breath is exhaled into
the surrounding atmosphere. The majority
of submersibles employ some variety of open-
circuit emergency breathing modified from
scuba. The system may consist of: 1) A
mouthpiece and pressure regulator con-
nected by high pressure tubing to the vehi-
cle’s low or high pressure ballast-blowing air
supply, or 2) the same components connected
to either portable or non-portable tanks of
compressed air. Exception is found where
the mouthpiece, regulator and hose are con-

nected to non-portable tanks within the pres-
sure hull filled with compressed oxygen.
Both the portable or non-portable systems
offer the advantages of being simple to oper-
ate, reliable and relatively inexpensive. Eye
protection is afforded by face masks. The
disadvantage to the open-circuit system is
that the exhaled gasses may build up cabin
pressure to a point where decompression be-
comes a consideration.

Closed-Circuit Breathing:

In a closed-circuit system the occupants
inhale from a breathing bag and exhale each
breath back to the breathing bag through a
purifying cannister. Closed-circuit systems
consist fundamentally of an oxygen supply,
regulator, gas metering device, breathing
bag, mouthpiece or mask, carbon dioxide ab-
sorption cannister and breathing hose. Two

systems used in submersibles are the West-
inghouse Corp.’s Min-O’ Lung (Fig. 14.10) and
The Mine Safety Appliance’s U.S. Navy
Mark II. Both use 100 percent oxygen and
are lightweight and simple to use. In addi-
tion to these advantages, the closed-circuit
system does not increase cabin pressure be-
cause the used air is recirculated back into
the system. A disadvantage, however, lies in
the toxicity of oxygen under pressure.
Though the submersible’s cabin pressure is
generally held at atmospheric, a doubling of
this pressure (29.4 psia) allows less than 40
minutes of breathing before the danger of
toxicity occurs. In most submersibles the
pressure-toxicity potential level is unlikely
to be reached because the vehicle will be at
or near atmospheric pressure and, with the
donning of the closed-circuit system there is
no further introduction of gasses (pressure)

Fig. 14.10 The Westinghouse Min-O'Lung (left) and Drager (right) emergency breathing systems. Both have about 0.5 hours endurance. (Westinghouse Corp.)

668

into the hull. However, in a lock-out vehicle
where the divers may be at cabin pressure in
excess of 29.4 psia, the oxygen closed-circuit
system is a definite hazard. For this reason
none of the lock-out submersibles covered
herein employs an oxygen closed-circuit sys-
tem for emergency breathing.

The duration of an emergency breathing
system is difficult to pre-determine. The
closed-circuit systems may supply sufficient
oxygen for 1 to 4 man-hours of breathing.
The key, however, is the user and his activ-
ity. In an emergency the average person’s
respiration will increase and the emergency
breathing gasses will expire much sooner
than under non-stress conditions. Other fac-
tors which will increase rate of gas consump-
tion are cold and physical exertion. The ideal
situation in an emergency is for the occu-
pants to remain calm and breathe at a slow,
even rate to conserve their air. Some individ-
uals are capable of controlling themselves
under times of stress; others are not. There-
fore, the maximum duration of emergency
life support is, by and large, an intelligent
approximation.

Chlorate Candles:

Though rarely used in submersibles, an-
other source of emergency oxygen is from
chlorate candles composed of sodium chlor-
ate (82-88%), barium peroxide (8%) and a
binding material. When the candles are ig-
nited, a chemical reaction ensues which re-
leases high purity oxygen at a rate depend-
ing mainly on the candle’s cross section. The
oxygen produced is passed through a filter
which removes salt spray and cools the oxy-
gen. The average property of chlorate can-
dles (38) are:

Oxygen produced

per pound of candle 0.382-0.38 lb
Specific gravity

of candle 2.4
Heat generated 100 Btu ft?
Storage life 10-15 years

Gas purity better than 99%

Loss of Electrical Power

The total loss of electrical power in all
submersibles means loss of horizontal ma-
neuverability, external lighting and avoid-
ance sonars. In a number of submersibles it

669

may also mean loss of normal life support,
and, perhaps, underwater communications.
Loss of maneuverability, lighting and avoid-
ance sonar or other working instruments is
not in itself critical if the vehicle is clear of
overhead obstructions. In this situation the
operator informs the surface support ship of
his plight and surfaces by non-electrical de-
ballasting or by using emergency power to
drop ballast. Where fail-safe deballasting
systems are incorporated, such as the bathy-
scaph’s automatic dumping of iron shot with
loss of power, surfacing is automatic. The
situation can become critical, however, if
power failure occurs when the submersible is
under ice, in an overhanging canyon or un-
der a cable or bottom-mounted hardware. In
such situations submersibles, as far as can
be determined, have no other option but to
ascend vertically. The threat to safety is
obvious, and the only recourse may be to
wait for surface assistance. In the fail-safe
jettison situation there is no recourse but to
surface, since, without power, the vehicle
cannot stop ascending by using its vertical
thruster. As discussed earlier in this section,
the safety of the operation must take into
account such contingencies prior to its initia-
tion. Historically, submersibles rarely oper-
ated under conditions where a vertical as-
cent would be dangerous. Hence, loss of lat-
eral maneuverability, lighting and other in-
struments generally resulted only in an
aborted mission and delay in the diving
schedule.

Loss of power, while not critical to most
life support systems, may nevertheless have
an adverse effect. The supply of oxygen
would not be affected by a power loss, since it
is released into the cabin by virtue of its
being under compression. Removal of carbon
dioxide, however, is dependent upon an elec-
trically-powered blower which circulates
cabin air through a scrubber. If the scrubber
fails, carbon dioxide builds up. The only
known exception to this is the BEN FRANK-
LIN wherein cabin air is circulated through
thin panels of lithium hydroxide by natural
convection currents.

Upon loss of electrical power there are
several options open to the occupants (Table
14.3). One of these, automatic weight drop,
has been discussed. Loss of lighting within

the cabin is counteracted with flashlights.
The remaining two options are discussed be-
low.

Emergency Batteries:

Some 25 percent of all submersibles carry
an emergency source of power within the
pressure hull. The source of this power may
be from nickel-cadmium, silver-zine, or non-
gassing lead-acid batteries. In the event of a
power failure the emergency batteries are
used to jettison equipment or weights and to
operate the underwater telephone, surface
radio or surface flashing light, depending on
the submersible.

Non-Electrical Ascent:

A number of vehicles have the capability
to drop weights or blow water ballast inde-
pendently of electrical power. In the water
ballast blow the system is operated simply by
introducing high pressure air, which is con-
trolled by a manual valve within the pres-
sure hull, into the external ballast tanks
and, consequently, force the water out
through the open orifice on the bottom of the
tanks. As the vehicle surfaces, the air ex-
pands and continues to vent through the
bottom orifice, thus maintaining pressure in-
side the tank equal to ambient and prevent-
ing the re-entry of water. In the weight drop
situation a solid shaft through the pressure
hull is manually rotated to actuate a cam-
like release. Both systems are common in the
shallow (less than 1,000-ft) submersibles.

EMERGENCY SYSTEMS
(SURFACED)

In spite of the various tracking systems
available, not all submersibles use them, and
it is common to spend some time searching
for a vehicle after it has surfaced. In a flat,
calm sea visual sighting is relatively easy,
but swell or waves only a few feet high can
make the low silhouetted submersible a diffi-
cult target to spot. Most difficult to locate
are those vehicles painted white and sur-
faced in a white-capped sea where they blend
unobtrusively into the background. A fur-
ther complication is added when the search
is conducted at night, although it is some-
times easier to locate the vehicle by its lights

670

at night than in the daytime. Location by
radar from the support ship is seldom feasi-
ble because the small target offered by the
submersible is lost in the sea return. More
than any other hazard, separation or lost
contact between submersible and support
craft is the most likely to occur. A small
submersible adrift on the open ocean offers
little in the way of comfort or sustained
survival to its occupants. To avoid this situa-
tion a number of devices are carried on and
within the submersible.

If contact has been lost, an immediate
concern is the life support endurance of the
vehicle. Most submersibles have a sail sur-
rounding their hatch which permits it to be
opened in moderate sea without taking
water aboard. Some vehicles are constructed
such that the hatch is integral with the
pressure hull and extends a few feet above
the surface to allow opening. A small number
incorporate neither of these characteristics
and must rely on inflatable trunks which
surround the hatch or on other means. Such
designs are discussed below and the equip-
ment and procedures employed to assist in
emergency surface situations are listed in
Table 14.4.

Separation from Support Craft

The following devices are carried aboard
submersibles to establish surface contact
and bring together the vehicle and its sup-
port craft.

Radio:

The type and characteristics of radios
aboard submersibles vary widely. Two-way
citizen band radio transceivers are common
where the submersible has sufficient free-
board to permit its use. Range of communica-
tions with the surface ship is limited to line-
of-sight (5 to 10 miles). Hand-held radios are
sometimes used, but to use these the hatch
must be opened to extend the antennae,
which is not always acceptable in a low free-
board submersible.

Radios serve two major post-dive func-
tions: 1) By virtue of radio communications,
they verify that the vehicle has surfaced;
and 2) they establish that the surface sup-
port craft has or has not visually located the
surfaced submersible. If the latter is the

case, action can be taken on the part of the
submersible operator to assist location. A
third function served by surface communica-
tion applies to those vehicles (e.g., DS-4000,
SP-500, SP-3000) which have no routine
means of viewing when surfaced but do have
radio antennae with thru-hull penetrations.
In this case communications are used to
apprise the operator of his situation regard-
ing retrieval which is accomplished by the
support craft and divers. In the pre-dive
stage, radio communications also serve to
inform the support craft of the vehicle’s
readiness to dive.

A radio signal may also be used as an aid
to location of the submersible if its frequency
is compatible with existing ship systems, and
if the support ship is equipped with a radio
direction finder.

Underwater Telephone:

As a backup to radios, underwater tele-
phones may serve as a means of surface
communications. In this mode the tele-
phone’s transducer obviously must be below
the sea surface. Several submersibles have a
second telephone transducer mounted on the
bottom of the vehicle which serves as an
alternate communications system. The ma-
jority, however, mount the transducer atop
the vehicle for communicating with the sur-
face when submerged. On the surface this
transducer is out of the water and ineffec-
tive.

Flashing Light:

To facilitate nighttime location a flashing
xenon light is atop many vehicles which can
be activated from within the vehicle with the
hatch closed. Where such lights are not in-
cluded, the operator may have the option, if
protection from flooding is afforded, of open-
ing the hatch and using a battle lantern or
flashlight to serve the same purpose. The
submersible’s underwater lights may be used
as an additional means of location by the
support craft, but the fact that the lights are
underwater limits their use as long range
viewing aids. Coast Guard requirements stip-
ulate running lights; these may also serve in
emergencies as well as during routine opera-
tions.

671

Radio Signal:

Only a few submersibles include a sepa-
rate, self-powered, radio emergency beacon.
DEEP QUEST is, as far as can be deter-
mined, the only submersible fitted with a
self-powered omnidirectional emergency bea-
con which transmits a 121.5 MHz signal to
assist homing in by Coast Guard aircraft.
The rest rely on the support ship’s radio
direction finder to obtain a bearing on the
vehicle.

Distress Rockets and Flares:

Should surface location not be possible
through any of the above means, there are at
least seven submersibles which carry dis-
tress rockets and flares to assist in visual
location. Distress rockets (Fig. 14.11) are em-
ployed to signal the general location of the
vehicle and the fact that the submersible is
in extremis. Flares, smoke pots and dyes
serve similar purposes, but also present a
signal that may be visually traced to its
source.

For safety reasons there is a reluctance on
the part of some vehicle owners to carry
pyrotechnic devices within the limited con-
fines of a submersible’s hull, possibly ac-
counting for their absence in the majority of
vehicles.

Fig. 14.11 Distress rockets (left) and hermitically sealed parachute flares (right) may
be fired from the launcher (center) carned aboard DEEPSTAR 2000

Anchors:

Very few submersibles carry anchors. Ad-
mittedly, their use from a surfaced submers-
ible in the deep sea is impractical, if not
physically impossible. However, a great deal
of submersible work is performed not far
from shore where separation from the sup-
port craft may place it in a position of drift-
ing into shoal water before assistance can
arrive. A number of the devices discussed
above are shown in Figure 14.12 aboard BEN
FRANKLIN prior to its 30-day drift.

Life Rafts:

The French SP-3000 carries a 1-man life
raft for each of its three crew members and
Westinghouse Corporation’s DS-2000 car-
ries a 3-man life raft (Fig. 14.13); both are
inflatable either manually or automatically.

Breathing Gasses Expired

Several situations can occur whereby a
surfaced submersible may find it necessary
to flush out its cabin air or obtain additional
breathing gasses: 1) Where the vehicle has
lost all contact with surface support and is
adrift sufficiently long to exhaust its life
support system; 2) where sea state does not
permit retrieval and the vehicle must be
towed a long distance; and 3) where the
normal cabin air has been contaminated. An
obvious solution entails merely opening the
hatch and flushing out the cabin. In the vast
majority of submersibles this solution is pos-
sible, but it is limited by sea state. Protective
fairings or sails around the hatch of many
submersibles extend 3 or 4 feet above the
waterline and afford protection from swamp-

SURFACE RADIO
ANTENNA

|
cTGhy Bamase0" SCAN
TV CAMERA
“

OBSTACLE AVOIDANCE
SONAR (CTFM)

™ = 'ANCHOR

4 KHZ TRACKING? Me
PINGER 2

ys

ni ™ 16 KHZ TRACKING
se .~ ~ TRANSPONDER
. SRS

Fig. 14.12 Various emergency preventive and corrective devices aboard BEN FRANKLIN. (Grumman Aerospace Corp.)

aN YES FE
he
USE

iENGY

Fig. 14.13 DEEPSTAR 2000's 3-man “Winslow’ life raft.

673

ing in sea state 6 and possibly higher. A
substantial number of the shallow-diving ve-
hicles have a conning tower which is an
integral part of the pressure hull and ex-
tends 1 or 2 feet above the waterline where it
is capped by a cover (Fig. 14.14). With these
vehicles, opening the hatch in any but a very
calm sea risks swamping. To avoid this, sev-
eral submersibles incorporate special fea-
tures to permit cabin air replenishment or
egress from the surfaced vehicle.

Inflatable Hatch Trunk:

In DS-4000, SP-350, SP-500 and SP-
3000 the hatch is below or just at the water-
line when surfaced; if it were opened the
pressure hull would flood. To avoid this the
designers have incorporated an inflatable
trunk or conning tower around the hatch
which, when inflated, affords a measure of
protection from the sea. In DS-4000 (Fig.
14.15) an inflatable, 39-inch-high conning
tower is installed around the periphery of
the hatch. An externally-mounted air cylin-
der is used to inflate the rubberized nylon
tower which is operated by turning a me-
chanical shaft within the pressure sphere. In
normal vehicle operations, the tower is
stored in a fiberglass trough. The storage
housing is topped by a fiberglass cover inte-
grated into the basic fairing and the cover
pops free from its spring-loaded catches as
inflation forces the tower upward.

Inflatable Modules:

The U.S. Navy’s MAKAKAI has about 1.5
feet of freeboard at the hatch when surfaced.
Hence, operator entry and exit are normally
made with the vehicle on the support boat.
In the event of a need for emergency exit, a
system is incorporated to provide both free-
board and surfaced stability. This system
consists of four inflatable rubber cylinders
which are normally rolled and stowed in
containers attached to the vehicle’s frame.
The cylinders are inflated from a 70-cubic-
foot scuba bottle by actuating a solenoid
valve. When inflated (Fig. 14.16), they pro-
vide an additional displacement of 55 cubic
feet, thereby raising the hatch about 4 feet
out of the water. The system also stabilizes
the boat if one or both battery pods are
released. Of the acrylic plastic-hulled sub-

Fig. 14.14 Protection from swamping is afforded by TECHDIVER's (PC-3B) extended pressure hull. (NAVOCEANO)

NT anaes ca ONO Oe oo Raa
" ail z i “=

Fig. 14.15 Inflated conning tower on DEEPSTAR 4000. (Westinghouse Corp.)

674

Fig. 14.16 Inflatable modules increase MAKAKAI's freeboard to about 4 feet for safe exit when surfaced. (NUC)

mersibles (NEMO, MAKAKAI, JOHNSON
SEA LINK), only MAKAKAI provides a
means of minimizing the potential for
swamping. Unless flat calm conditions pre-
vail, the occupants may safely open the
hatch only when the submersible is aboard
its support craft.

Snorkel:

Several of the shallow-diving vehicles and
the early FNRS-2 and 3 bathyscaphs incor-
porate a simple snorkel device which allows
fresh air to enter the hull by merely opening
a valve.

DEVICES TO ASSIST
UNDERWATER RESCUE

In the event that a submersible cannot
surface and egress is impossible, there are
instruments or devices available to the occu-
pants to assist their rescuers (Table 14.5).
From the rescuers’ point of view the ques-

675

tions calling for immediate answer are:
Where are they? How deep? What is the
nature of the casualty? and What is the
remaining life support? At this point, not
only are the design and capabilities of the
vehicle critical, but the ocean environment
surrounding it is another salient factor.

A critical instrument in all rescue opera-
tions is the underwater telephone. If there is
no means of communication between rescuer
and rescuees, recovery of the submersible
within its life support endurance would be
fraught with uncertainty and difficulty.

In addition to the need for communications
is the ability to locate the submersible. There
are several underwater three-dimensional
navigational systems commercially available
through which a submersible may determine
its own position or a surface craft may locate
the submersible relative to itself with ex-
treme accuracy (see Chap. 10). But such sys-
tems are quite expensive and beyond the
operating budget of most private and many
government owners.

TABLE 14.5 DEVICES TO ASSIST UNDERWATER RESCUE

Marker Buoy

Underwater Telephone

Pingers/Transponder

External Lights

External Gas/Air/Electrical Connections
Salvage/Lift Padeye

Environmental Sensors

Obstacle Avoidance Sonar

Of equal importance is the life support
endurance—in the 1-man submersible K-250
it is 6 hours; in the 6-man BEN FRANKLIN it
is 252 man-days. Obviously the time availa-
ble to locate, mobilize and employ rescue
devices is virtually nil in the former and
optimum in the latter. A histogram of total
life support endurance (normal and emer-
gency) is presented in Table 14.6. This infor-
mation was obtained mainly from manufac-
turers’ brochures and technical articles de-
scribing the vehicle. Total life support is
given in man-hours and the normal maxi-
mum number of occupants is noted in paren-
theses. Dividing the number of occupants
into total man-hours makes one fact quite
clear: In an emergency, there is precious
little time to respond and act. Of the total 79
submersibles on which life support data are
available, the following are the percentages
of vehicles wherein life support will expire
between the given hour intervals:

6—24 hours: 36%
24—48 hours: 44%
48—72 hours: 15%

72 hours: 5%

The later into a mission an emergency
occurs the less time there is, of course, to
assess the situation, attempt self-cures and/
or to call in outside assistance. Just how
critical the situation can become is obvious if
you subtract the time necessary to mobilize,

676

transport and deploy rescue teams and de-
vices. This subject will be dealt with in a
later section of this chapter. It is sufficient
to note that 80 percent of past and present
vehicles have a life support duration of no
more than 48 hours, a precariously short
time in which to effect underwater rescue.

Depth, water temperature, visibility, cur-
rents, surface conditions and a variety of
other environmental factors govern both the
type of rescue attempts or devices that can
be used and the methods in which they may
be deployed. These factors, of course, cannot
be controlled by the submersible, but infor-
mation as to their presence and scope can be
provided by the vehicle’s occupants to aid
the rescuer in his choice and deployment of
rescue devices.

In order for any external devices to be
effective, the submersible must be accom-
panied by a surface support craft of some
description either to effect rescue or to call
in assistance. There are no hard and fast
rules applied to submersible diving, but few
submersibles, if any, dive without a surface
support craft in attendance.

Telephones

Table 14.1 shows that over 75 percent of all
submersibles carry an underwater tele-
phone. This does not mean that all have the
same communications capacity; some are

ALL OCEAN INDUSTRIES
ALUMINAUT
ALVIN
AQUARIUS 1
ARCHIMEDE
ARGYRONETE
ASHERAH
AUGUSTE PICCARD
BEAVER

BEN FRANKLIN
BENTHOS V
DEEP DIVER
DEEP JEEP

DEEP QUEST
DEEPSTAR 2000
DEEPSTAR 4000
DEEPSTAR 20000
DEEP VIEW
DOWB
DSRV-1&2
GOLDFISH
GRIFFON

GUPPY

HAKUYO
HIKINO
JOHNSON SEA LINK
KUMUKAHI
KUROSHIO II
MAKAKAI
MERMAID I/II
MERMAID III/IV
MINIDIVER
NAUTILETTE
NEKTON A, B,C
NEMO

NEREID 330
NEREID 700
OPSUB

PAULO 1

PC-3A1 & 2
PC3-X

PC-8B

PC5C

PISCES |

PICES II, II, 1V, V
QUESTER 1
SDL-1

SEA CLIFF

100 200
24 (2)*
80 (3)
108 (3)
96 (3)
48 (2)
144 (4)
96 (2)
80 (4)
104 (2)
192 (4)
144 (3)
144 (3)
146 (3)
38 (2)
195 (3)
204 (27)
18 (5)
100(3)
72 (2)
144 (4)
48 (2)
72 (4)
32 (2)
96 (4)
72 (2)
60 (2)
60 (4)
18 (2)
2 (2)
48 (2)
64 (2)
96 (3)
NA
50(2)
96 (2)
20 (2)
48 (2)
144 (2)
180 (3)
144 (2)
76 (3)
NA
204 (6)
105 (3)

(_)*Normal crew complement including passengers.

677

TABLE 14.6 TOTAL LIFE SUPPORT DURATION (MAN-HOURS)

300 400 500

432 (6)

2A 1920] (10)

—S 55MM

-—_—_—_________—_—__——_— 6768} (6)

TABLE 14.6 TOTAL LIFE SUPPORT DURATION (MAN-HOURS) (Cont.)

SEA OTTER
SEA-RAY

SEA RANGER
SHELF DIVER
SHINKAI
SNOOPER
SP-350

SP-500 (2 Vehicles)
SP-3000
SPORTSMAN 300
SPORTSMAN 600
STAR |

STAR II

STAR III
SUBMANAUT (HELLE)
SUBMANAUT
SUBMARAY
SURV

SURVEY SUB 1
TECHDIVER
TOURS-64
TOURS-66
TRIESTE
TRIESTE Il
TRIESTE III
TUDLIK (PS-2)
TURTLE

VAST MK II (K-250)
VIPER FISH
VOL-L1
YOMIURI
FNRS-2

FNRS-3

100 200 300 400 500
200 (3)
120 (4)
72 (4)
192 (4)
96 (2)

144 (3)

120 (2)

300 (6)

100 (2)

240 (3)

105 (3)

192 (4)

100 (2)
100 (2)

( )*Normal crew complement including passengers.

very short ranged and carrier frequencies
are not consistent.

Fortuitously, most use a carrier frequency
of about 8 kHz, and are compatible with U.S.
Navy underwater telephones (UQC) which
operate on 8.0875 kHz. This means that they
may be assisted by a variety of Naval as well
as civilian vessels. The underwater tele-
phones reported in use aboard submersibles
are shown in Table 14.7. It shows that a few
operate on other than 8 kHz, thus precluding
communications not only with Naval units
but most other submersibles as well. From
the sources available, the only known excep-

678

tions to the 8-kHz carrier frequency are SEA
OTTER, SUBMANAUT (Helles), PS-2, KU-

MUKAH I (24-28 kHz) and SP-350 (42 kHz).
The ranges presented in Table 14.7 are
advertised ranges and, in some cases, ranges
supplied by the vehicle’s owner. These are
slant ranges, and allowance must be made
for the vehicle’s depth and bearing relative
to the support craft when computing hori-
zontal range. Depending on water conditions
these ranges may be more or less than speci-
fied. The bathyscaph TRIESTE obtained ex-
cellent reception and transmission at a depth
of 35,800 feet with its 8-kHz underwater tele-

phone built at NEL especially for TRIESTE.
In certain areas reception is poor even
though the range is well within that adver-
tised—e.g., when the vehicle might be in a
deep canyon, and echoes produce weak or
garbled messages. Similar communicating
problems may be encountered in shallow
slant-range modes between surface vessels
and submerged vehicles. Thermal discontin-
uities occur where the transmission is en-
tirely masked or where the same signal ar-
rives at closely-spaced, but different time
intervals (as a result of multipath transmis-
sion). Optimum surface-to-subsurface com-
munications occur when the surface ship is
directly or nearly directly over the submers-
ible and acoustical signal paths are normal
to near-surface temperature (density) discon-
tinuities. Similarly, good communication is
usually obtained between two or more sub-

mersibles at depths below the thermocline.
There are no standard practices for fre-
quency of communications between submers-
ible and support craft. Some operators insist
on immediate surfacing if communications
are lost, while others allow operations to
continue for some specified time and then, if
communications are still out, require surfac-
ing. Still others merely wait to see what
went wrong after the vehicle’s operator de-
cides to surface (4).

Tethered submersibles, such as GUPPY
and KUROSHIO IT, rely on a hard line com-
munication system built into the power-sup-
plying umbilical between surface ship and
submersible. From the information availa-
ble, it is unclear whether or not a wireless
means of communication is available in the
event that the cable parts. Some shallow
diving vehicles, e.g., the NAUTILETTE se-

TABLE 14.7 MANNED SUBMERSIBLE UNDERWATER TELEPHONES

ee

Manufacturer Model No.

De eae ee

Aquasonics Engineering Corp.
San Diego, Calif.

Hydro Products DV-811
San Diego, Calif.
Helle Engineering 3600 (UTO 1)
San Diego, Calif.

(He-14A)
3114
415i
STRAZA Industries 200-W
El Cajon, Calif. ATM 502A
ATM 503
ATM 504
ATM 504A
SUBCOM SYSTEMS, LTD 100S-20A
No. Vancouver, B.C.
110S-20
1278-20
Westinghouse Underseas Div. 400A
Annapolis, Md. 415A

679

Carrier Frequency Max Range
(kHz) (yd)
8 4,000
42 3,000
8.0875 4,000
25.3-28.5 4,000
42 2,000
8-11 10,000
8.0875 15,000
8.0875 15,000
8.3-10.7 7,500
8.0875 15,000
8.0875 20,000
8.075 or 25 6,000
3,000
8.0875 6,000
25 3,000
8.0875 25,000
8.087 10,000

ries, use a hard line telephone attached to a
radio-equipped surface buoy, thereby obtain-
ing both a tracking and communications ca-
pability on a single system.

A most fundamental means of communica-
tion is found in BEN FRANKLIN’s SAS. This
consists of a small cylindrical chamber in the
top of the pressure hull into which hollow
glass balls are placed and “locked-out”’ to the
surface. The diameter of the hatch is 150
mm. Messages were sent in the glass spheres
to the support ship during the Gulf Stream
Drift mission. While this system is obviously
limited and irreversible, it does constitute a
means of one-way communications when all
else fails.

Marker Buoys

Undoubtedly, the surest method of locat-
ing a submersible is by the attachment of a
buoy. Several submersibles have the capabil-
ity of releasing a buoy which is held to the
vehicle by a thin line. Depending on the
submersible, the buoy and line may serve
several purposes. At the least, it provides a
visual target which potential rescuers may
follow to the vehicle; at most, a hook and
stronger salvage line can be slid down the
marker line to automatically attach to a lift
padeye on the vehicle. SEA OTTER incorpo-
rates this latter feature which is shown in
Figure 14.17.

Acousties

The function of acoustic pingers and trans-
ponders was discussed earlier to the extent
that they are used to maintain a given range
and bearing between support craft and sub-
mersible. In an emergency situation these
devices may be used by a rescuer to locate
and home in on the submersible, using either
another submersible or an unmanned rescue
device. Several factors control usefulness of
pingers. At the very least the rescuer must
be able to receive the frequency of the trans-
mitting device. Further, the majority of pin-
gers and transponders are self-powered and,
therefore, limited in duration. The variety
and capabilities of pingers and transponders
are so numerous that to list all could be
confusing. For example, some 40 companies
in the U.S. manufacture pingers, and 46

680

manufacture transponders. To further ex-
pand the list, a variety of pingers and trans-
ponders is available from each manufac-
turer. A current list of pingers from Helle
Engineering shows 23 models with ranges of
0.5 to 5 miles, duration of 2 days to 5 years,
frequencies of 8 to 50 kHz and depth ranges
of 600 to 10,000 feet. Many competitors offer
an equally wide variety.

It should be mentioned that other sources
of acoustic transmissions are available on
submersibles, in addition to pingers and
transponders. The majority of underwater
telephones listed in Table 14.7 are capable of
continuous wave (CW), as well as voice,
transmission. In the CW mode a telephone
can also serve as a homing beacon.

Likewise, upward-looking echo sounders,
side scan sonars, obstacle avoidance sonars
and other acoustic devices found on some
submersibles offer some degree of homing
capability. At the lower end of the spectrum
is sound produced by the occupants tapping
on the hull which may serve as a crude
source of communications and a very limited
homing beacon.

In order for any system to be an effective
communications or homing device for res-
cuers or for assistance from sources other
than its support craft, the support craft must
carry a ship-to-shore radio and some form of
surface positioning system. When a submers-
ible is working out of sight of land the sup-
port craft may attain its own position via a
sextant or an electronic aid to navigation
which may be accurate to within several
miles to a few hundred yards. In any event,
because of the considerable difficulty in re-
turning to the same position and reestablish-
ing acoustic contact with the submersible, it
would be unwise for the support craft to
leave the scene to seek assistance (or for any
other reason). On the other hand, one might
expect the support craft to immediately
plant a buoy to aid in maintaining and/or
regaining the submersible’s position in the
event of a pinger or other critical electronic
component failure. Planting a marker buoy
may be easily done if the submersible is in
shallow (200-ft) water, but in the case of the
deeper vehicles, the thousand or more feet of
line required is not generally a part of the
support craft’s on-board inventory.

CABLE

= i
\

Fig. 14.17 SEA OTTER's marker buoy (Grimsby Float) is released by rotating a handle in the hatch cover which pulls out a restraining pin As the float ascends it reels out the '/4-inch
line which is spooled around and attached to a 25-ton-capacity cable shackled to the hull. The ice tong-like device is slid down the line which is fair-leaded through a hole in the block
holding the tongs open. Reaching the cable, the block is knocked out and the tongs close on the cable. A lift line attached to the tongs is then employed to retrieve the vehicle

If the support craft carries no accurate
positioning system from which it can ascer-
tain its position and relay it to potential
rescuers, then more time is lost by the res-
cuers in searching for the support craft. And,
as we have seen, time is of the essence—for
every minute spent cuts into the all-too-
short life support.

681

External Lights

Depending on water clarity, a submers-
ible’s lights (Fig. 14.18) may offer a visual
means of homing in on the vehicle once the
rescuers have obtained its relative bearing
and are within viewing range. In essence,
lights are a secondary device to assist res-
cue, in that other devices (pingers, marker

Fig. 14.18 ALUMINAUT's lights provide an excellent means of visually-locating the
vehicle from several hundred feet distance. (Reynolds Submarine Services)

buoys, etc.) provide the primary means of
locating the submersible at long range.

Lift Padeyes

Most submersibles have a padeye or ring
to which a line or cable is attached for
launch or retrieval. This can serve as a point
of attachment for emergency lifting, assum-
ing it to be clear of interfering obstructions.
Such padeyes, however, are not of standard
size and location, and finding and attaching
a suitable hook may take time. A few of the
larger (greater than 15 tons) submersibles
are launched by a cradle supporting them
from the keel. In this case there may be no
padeye, and this could cause salvage to be-
come unduly complex and time-consuming
while a suitable lifting arrangement is de-
signed and fabricated.

682

External Air/Gas/Electrical
Connections

In order to replenish deballasting air,
breathing gasses or electrical power, exter-
nal attachments are incorporated into a
small number of vehicles which allow replen-
ishment while submerged. One of the simpler
methods is found on the All Ocean Indus-
tries vehicle which incorporates a standard
scuba tank manifold through its hull (Fig.
14.19). The ease with which resupplying can
be made is dependent upon depth. A diver is
most effective, but he is depth-limited. A
submersible is less effective owing to its de-
creased maneuverability and manipulative
dexterity. Equal to the submersible’s capa-
bility are the unmanned devices which also
have less maneuvering and manipulative
ability than human beings, but both manned
and unmanned systems are capable of oper-
ating to depths encompassing 98 percent of
the ocean floor (20,000 ft).

Fig. 14.19 A scuba bottle valve attached to a thru-hull penetration provides air from
a scuba tank to blow main ballast in the All Ocean Industries vehicles. The rack in the
foreground holds the scuba bottle.

Environmental Sensors

Five environmental factors exert a heavy
influence on rescue efforts: Depth, tempera-
ture, currents, visibility and sea state. Depth
gages are standard on all submersibles, and
this value may be relayed to the surface.
Should there be no telephone on the vehicle,
the support craft may measure the depth.
The remaining factors may differ widely
from surface values, and must be measured
or estimated in situ. Temperature has its
greatest influence on divers by both directly
and immediately affecting the quality and
duration of their performance. The majority
of submersibles do not carry an external
thermometer, and, hence, have no direct way
of measuring seawater temperature. Indi-
rectly ambient temperature may be meas-
ured by measuring the internal pressure hull
temperature which produces an approximate
value. The hull material has a major influ-
ence on such indirect measurements owing
to the different thermal conductivity of met-
als and plastics.

Currents directly affect the maneuvering
ability of both manned (including divers) and
unmanned devices. Current meters are
rarely carried on submersibles; thus, the oc-
cupants may only have the ability to meas-
ure water speed and direction by the visual
observation of suspended particles in the
water column. By observing particle move-
ment relative to the submersible’s heading
(determined by a compass) a fairly accurate
estimate of direction may be obtained. Speed
estimates are far more difficult because
there are no reference points; hence, the
estimate reduces to “fast” or “slow.”

Visibility ranges are more difficult to
measure and no known submersible rou-
tinely carries the instruments required for
such measurements. There is almost always
a few feet of visibility in the open ocean. In
coastal or estuarine areas this is not always
the case, and, at times, changing tides, sedi-
ment run-off from land and seasonal plank-
ton blooms may reduce visibility to nil.

There is little one can do about high sea
states except to wait for better conditions
and then act immediately when they arrive.
One can recommend that diving only be con-
ducted when several days of good weather
are predicted, but such recommendations are

683

impractical when diving in, for example, the
North Sea where “good” weather is a rela-
tive term and, at certain times of the year, is
measured in hours rather than days.

Avoidance Sonars
Submersibles with trainable obstacle

avoidance sonars may be able to actively

acquire rescuers and direct them to the site
by means of the underwater telephone. If the
stricken vehicle is immobilized its ability to
scan and acquire a target is reduced to its
sonar’s training ability, and to be effective to
its maximum range there must be no obsta-
cles to transmission. Such devices can offer
significant assistance to rescuers, as was
demonstrated when an entangled DEEP

QUEST used its CTFM sonar to vector the

submersible NEKTON to within visible range

(5).

Such are the capabilities the various sub-
mersibles have to avoid, respond to and as-
sist in potential or actual emergency situa-
tions. It is emphasized that no one submers-
ible carries all these devices or possesses all
these capabilities. At this point in time, the
emergency equipping of a vehicle is up to the
owner.

In September 1972 a Submersible Safety
Seminar, sponsored by a variety of govern-
ment and private organizations, was held at
Ft. Pierce, Florida. The results of this semi-
nar have not been formally published, but
the proposals for improved submersible
search and rescue capabilities offer an in-
sight into the thoughts of recognized deep
submergence authorities. Though all partici-
pants did not unanimously concur with all
proposed measures, the following capabilities
were listed as desired:

1. External attachments for
providing breathing gas to
occupants whenever practi-
eal.

2. A homing device, e.g., pinger,
between 10- to 40-kHz fre-
quency and 72-hour duration.

3. Appropriate coloring and op-
tical lights for both surfaced
and submerged detection.

4. An appropriate and accessi-
ble emergency lift attach-
ment.

Submersible:

Support Craft: 1], A standard lift hook equiva-
lent or superior to those used
by the U.S. Navy (25-ton
forged titanium snap hook).

The results of this seminar contain a num-
ber of practical recommendations for in-
creasing the safety of submersible opera-
tions and are included in the Marine Tech-
nology Society’s Safety and Operational

Guidelines for Undersea Vehicles, Volume

IT, published in 1974.

REFERENCES

1. Todd, M. R. 1972 Progress in submarine
escape in the Royal Navy. Conf. Papers,
Oceanology International 72 Conference,
19-24 Mar. 1972, Brighton, England, p.
506-507.

684

. Mavor, J. W., Froehlich, H. E., Marquet,

W. M. and Rainnie, W. O., Jr., 1966 ALVIN,
6,000-ft. Submergence Research Vehicle.
Proc. Ann. Meeting of the Soc. Naval Ar-
chitects and Marine Engineers, New
York, 10-11 Nov. 1966, n. 3, 32 pp.

. Penzias, W. P. and Goodman, M. W. 1973

Man Beneath The Sea. Wiley Intersci-
ence, John Wiley & Sons, New York, 831
pp.

. Link, M. 1973 Window in the Sea. Smith-

sonian Inst., Wash., D.C.

. Wenzel, J. G. 1969 Emerging capabilities

in underwater work systems. Trans. of the
Symposium “Working in the Sea’, 20-22
Oct. 1969, Mar. Tech. Soc., Wash., D.C., p.
209-230.

EMERGENCY INCIDENTS AND THE
POTENTIAL FOR RESCUE

Since the beginning of modern deep sub-
mergence, a variety of near fatal and fatal
situations have occurred which tested many
submersibles’ ability to extricate themselves
from or endure an emergency. Unfortu-
nately, there has been no central point
whereby such emergencies could be filed and
later analyzed to provide guidance toward
safer vehicles and operating procedures. On
the other hand, there was, and still is, no
clear definition of an emergency. Where loss
of communications may be an emergency to
one, it may be considered simply an irrita-
tion to another. A leaking penetrator on
BEN FRANKLIN was not considered serious
enough to surface and abort its mission; in
such cases it’s the degree, not the occurrence

685

of a leak, that constitutes an emergency.
Distinguishing an emergency from a routine
malfunction is still arbitrary.

To gain an appreciation for the variety and
nature of submersible emergencies and acci-
dents and the ability of past and present
systems to respond, documented and undocu-
mented incidents will be briefly discussed in
this section. The majority of these incidents
are taken from a report by Mr. J. A. Pritzlaff
(1), Chairman of the Marine Technology Soci-
eties Undersea Vehicle Safety Standards
Subcommittee, who reviewed some 20 differ-
ent accidents and incidents with the goal of
deriving information which could be used in
subsequent submersible operations. When
Pritzlaff is not the source, it is so noted, and

the appropriate reference given. Where no
reference is provided, it is from the author’s
personal experience.

One or two submersibles appear more fre-
quently than others in the following inci-
dents; this is not because they are less safe,
but reflects the fact that they either dived
more often or their incidents were recorded
and published. DEEPSTAR 4000, for exam-
ple, appears quite frequently. This can be
attributed to its frequency of diving between
1966 and 1969 (approximately 500 working
dives) and the fact that Mr. Pritzlaff is an
employee of DS-4000’s owners (Westing-
house Corp.) and has access to its diving
history.

INCIDENTS

As far as is known, the only instrument
used to avoid exceeding operational depth
which has performed satisfactorily is the
depth gage. Automatic deballasting or re-
straining (surface buoys) devices seem, in-
stead, to have worked as the following inci-
dents demonstrate.

Buoys
Submersible: PC-3B (TECHDIVER) Date:
5 June 1965

Incident: Trailing a 0.25-inch-diameter
nylon line and surface buoy, PC-3B found
forward movement impossible at a depth of
400 feet along a vertical escarpment in the
Tongue of the Ocean, Bahamas. After back-
ing down, it was found that the line was
hung on an outcrop. The line’s breaking
strength was believed beyond the ability of
the submersible to break by deballasting;
hence, it was removed and not used on subse-
quent dives in this operation.

Submersible: SP-350 (DIVING SAUCER)
Date: 1959 Reference (2)

Incident: Trailing a 330-foot nylon line
attached to a surface buoy, SP-350 experi-
enced difficulty in steering. Turning the ve-
hicle around, the operator found that the
line was snagged on a coral head at the 100-
foot depth and, by maneuvering, freed the
line.

686

Submersible: PC5C Date: NA Reference (1)

Incident: On shallow missions Perry op-
erated vehicles (PC5C, SHELF DIVER and
others) periodically towed surface buoys for
tracking purposes. These buoys have occa-
sionally become entangled in surface struc-
tures or the tracking ship. In one case, the
ship caught the buoy line and actually
dragged the submersible off course. Because
the buoy and buoy line were firmly attached
to the submersible and there was no method
available for the submersible to release the
line if it became entangled, a line release/
cutter assembly was added to the submers-
ibles to jettison the line.

Submersible: DEEP JEEP Date: ca. 1966
Reference (3)

Incident: While submerged, DEEP
JEEP’s “fail-safe” electromagnetically se-
cured ballast plates accidentally dropped
and, without the operator’s knowledge, the
submersible began to ascend with five or six
ships overhead. The operator was able to
bring the vehicle to a halt 30 feet below the
surface where he remained until located by
his support craft and cleared to surface.

Underwater Obstacles
Submersible: ASHERAH Date: 1964 Refer-
ence (1)

Incident: ASHERAH was operating in a
depth region where wave action was a factor.
There were no guards on the viewports and
no structures in front of the pressure hull.
The submersible struck an underwater ob-
ject and the viewport cracked, but did not
flood. External guards were later installed in
front of the viewports (Fig. 15.1).

Loss of Normal Surfacing
Submersible: SP-350 Date: 1959 Refer-
ence (2)

Incident: At 360 feet deep SP-350’s
nickel-cadmium batteries short-circuited.
The ascent weight was dropped and the vehi-
cle began to ascend until gas generated in

Fig. 15.1 Though its bow equipment rack prohibits head-on hull collision, ASHERAH's unprotected downward-looking viewports were susceptible to contact with sharp pinnacles
(Gen. Dyn./Elec. Boat)

_the brass battery boxes exploded and the Incident: The vehicle was to take core
vehicle descended. A 450-pound emergency samples; the dive was made with DS-4000 in
weight was dropped and SP-350 surfaced. a heavy (75-lb) trim condition, i.e., after the

descent weight was dropped the vehicle was

still negatively buoyant. Trim weights could

Submersible: DEEPSTAR 4000 Date: 25 be dropped to achieve neutral buoyancy if
October 1966 Reference (1) desired. With the vehicle on the bottom at

687

4,000 feet deep and maneuvering around to
place the corer, about 100 pounds of silt were
picked up in the fairing cavities. The hy-
draulic system failed due to mechanical sei-
zure of a face seal and the mercury trim
system could not transfer mercury forward
to drive in the corer tubes. It was decided to
abort the mission and surface. The following
events occurred: a) The 186-pound ascent
weight could not be released hydraulically
and the manual backup release was initi-
ated. The weight hung up in its housing and
did not drop. b) The small trim weights
(about 150-lb capacity) could not be dropped
due to the lack of hydraulic power. c) The
mercury of the trim system (200 lb) was
released using the nitrogen blow system but
the vehicle was still heavy. d) In an unre-
lated situation, the variable ballast bottles
had flooded (80 lb) due to faulty silver brazed
piping joints. Weight resources available in-
cluded the vehicle brow with its scientific
instrument suite (70 lb) and the forward
battery (450 lb). Since the exact weight sta-
tus of the vehicle was not known at the time,
the forward battery was dropped (450 lb) and
the vehicle ascended. The up trim angle of
the vehicle also shook out the ascent weight.
A rapid, safe ascent was made.

Submersible: PISCES III Date: 1971 Ref-
erence (4)

Incident: During a dive at approxi-
mately 600 feet deep, PISCES III experi-
enced difficulty in attaining level trim. A
check of the emergency warning systems
revealed that the aft machinery sphere was
flooded. Main ballast tanks were blown but
the vehicle merely came to a near-vertical,
bow-up position and remained stern-first in
the bottom. The Canadian Defense Minis-
try’s SDL-1 was undergoing sea trials at the
same time and at the same location, and
carried down a lift line which it attached to
PISCES III’s port motor guard. Some 8
hours later the vehicle was winched to the
surface. A postmortem revealed that drain
plugs in the machinery’s sphere were left
open during the dive and allowed seawater
to enter and flood the sphere.

688

Entanglement

Submersible: DEEP QUEST Date: October
1969 Reference (1)

Incident: While conducting a recovery
test in 430 feet of water, DEEP QUEST
became entangled with a 3/s-inch polypropyl-
ene line. The line was caught in the port
propeller of the vehicle and anchored the
submersible to the test object. The submers-
ible NEKTON was transported to the scene
and, attaching a diver’s knife to its manipu-
lator, cut DEEP QUEST free. At any time
during its entanglement DEEP QUEST had
the capability of dropping its batteries which
would have brought both the vehicle and its
“anchor” to the surface.

Submersible: JOHNSON SEA LINK Date:
17 June 1973 Reference (5)

Incident: Attempting to retrieve a fish
trap at 360 feet deep, the submersible be-
came entangled in the rigging of a scuttled
destroyer. Divers tried to extricate the vehi-
cle, but strong currents resisted their efforts.
The submersible PC-8 tried to assist but its
obstacle avoidance sonar failed and it was
ordered to discontinue efforts. Approxi-
mately 32/2 hours later a device holding a
television and a grapnel was lowered to the
submersible and conned into its final ap-
proaches by the submersible’s operator using
the underwater telephone. The device was
hooked onto the JOHNSON SEA LINK and
she was jerked free. Two occupants in the
aluminum lock-out cylinder perished. The two
occupants of the acrylic plastic forward
sphere survived. Cause of death was ascribed
to carbon dioxide poisoning when the carbon
dioxide scrubbing compound (Baralyme) lost
its effectiveness due to low temperature
(about 40°F) in the cylinder.

Submersible: PISCES III Date: 29 August
1973 Reference (6)

Incident: The submersible was on the
surface for retrieval when the towing line
from its support ship fouled on the hatch of
the aft machinery sphere and tore the hatch
cover off. The sphere flooded and PISCES III
(P.IIT) sank stern-first to the bottom at 1,575
feet. PISCES V (P.V) was sent with a 4-inch-
diameter polypropylene rope that would be
fitted into P.JIIP’s sphere opening. P.V was
eventually forced to attach the line to the star-
board propeller guard. Six and one-half hours
were required to locate P.III due to an error in
P.III’s depth gage, abnormal processing of
P.V’s gyrocompass and ship traffic interfering
with tracking and underwater communica-
tions. P.V finally homed in on P.III with its
sonor. The line attached by P.V was used as a
marker buoy on which a pinger was slid down
to P.III to assist homing, PISCES ITI and the
unmanned CURV each subsequently placed a
line on P.III and the submersible was brought
to the surface.

Submersible: TS-I Date: 14 October 1974
Reference (21)

Incident: During a pipeline inspection at
275 feet deep in the North Sea, a rope fouled
in the stern propeller of TS-I and held it fast
to the bottom. Six hours after fouling, divers
were able to cut the restraining line free and
the craft was able to surface under its own
power.

Loss of Electrical Power
Submersible: STAR III Date: August 1966
Reference (1)

Incident: During operations off Ber-
muda, the battery box of STAR III failed due
to insufficient pressure compensation, and a
total loss of electrical power ensued. Subse-
quently, the main ballast tank was blown
and the vehicle surfaced.

Submersible: GUPPY Date: NA Reference
(1)

Incident: Operating in the Bahamas,
GUPPY experienced flooding in a propulsion

689

motor resulting in a massive electrical short
circuit to the 440 VAC supply (cable power
from the surface). The power connector at
the motor had two seating surfaces that
were to seal when the connector was prop-
erly attached. Investigation of the flooding
showed a dimensional error of 0.012 inch
such that the connector looked seated but in
reality was not. Surfacing was accomplished
by reeling in the power cable as is normally
performed.

Submersible: BEAVER Date: June 1970
Reference (1)

Incident: During operations off Santa
Barbara, BEAVER experienced a propulsion
system short circuit and lost power to the
starboard propulsion motor at 1,545 feet.
Port and starboard trim was affected and
some arcing and smoking occurred inside the
pressure hull. A short circuit in a junction
box burned a hole in the starboard propul-
sion cable. The oil-compensating system for
the junction box tried to account for the loss
of oil in the box; this resulted in the loss of
the compensating oil which affected the vehi-
cle’s trim. The smoke in the pressure hull
was not sufficient to warrant use of the
emergency breathing devices by the four oc-
cupants.

Submersible: SP-350 Date: 1959 Refer-
ence (2)

Incident: Operating at 50 feet, the vehi-
cle’s nickel-cadmium batteries short circuited.
Owing to the poor thermal conducting prop-
erties of the oil-filled, fiberglass boxes the
compensating oil reached the boiling point.
The submersible surfaced by dropping its
ascent weight and was placed aboard the
support ship to allow the occupants to exit.
The carbon dioxide fire extinguishers were
unequal to the fire and it was necessary to
put the vehicle back into the water to extin-
guish the fire.

Submersible: TRIESTE II Date: July 1964
Reference (8)

Incident: Searching for the remains of
the submarine THRESHER at 8,200 feet, a
severe short circuit occurred in the bathy-
scaph’s main propulsion motors. The over-
load relays in the battery circuit failed to
open and they arced over to each other caus-
ing the batteries to discharge to zero and
melt the battery cables. Emergency batter-
ies in the sphere allowed control of shot
dropping and continuation of the life support
system. The author points out that if the fire
had been elsewhere than underwater, the
arcing, which occurred only 4 feet from the
gasoline reservoir, could have ignited the
46,000 gallons of high octane gasoline in the
buoyancy tanks.

Submersible: UZUSHIO Date: June 1974
Reference (20)

Incident: Diving in 33 feet of water the
tethered diving bell UZUSHIO experienced
an electrical short circuit in the interior vi-
nyl wiring insulation. An alarm on the sup-
port ship WAKASHIO sounded and the bell
was brought to the surface within moments.
Less than 2 hours after the alarm sounded
the two occupants were dead, the cause
being either toxic fumes or rapid consump-
tion of oxygen by the fire. It has been re-
ported that the vehicle’s designer subse-
quently committed suicide.

Separation From Support Craft
Submersible: DEEPSTAR 4000 Date:
1968 Reference (1)

Incident: The vehicle was diving at
night in the vicinity of the Gulf Stream. The
subsurface current profile did not follow the
surface current profile. This resulted in sepa-
ration of DS-4000 from its support ship and
loss of communications. Using established
“loss of communications” procedures, the ve-
hicle surfaced. An electrical storm affected
the small “CB” radio and surface communi-
cations could not be established. Six hours
after surfacing the pilot fired a small flare
that was seen by the support ship. Because
of this incident, the submersible’s “CB” radio
was replaced with a higher powered FM sys-
tem and an FM direction finding capability

690

was added to the support ship. The submers-
ible flare system was upgraded to a 20-mm
size with a parachute flare capability.

Submersible: DEEPSTAR 2000 Date: 5,
6 July 1972 Reference (9)

Incident: The submersible was diving in
Wilmington Canyon, 125 nm southeast of
Cape May, New Jersey. Tracking was con-
ducted with a range and bearing device from
a small (16-ft) boat with three people aboard;
the small boat was visually kept in sight by
the support ship. Weather predictions were
obtained from a New Jersey commercial ra-
dio station which predicted occasional show-
ers and 10- to 15-knot winds. At 1405 hours
(LCT) DS-2000 routinely surfaced out of vis-
ual range of both the small boat and the
support craft. Radio contact was established
with the submersible and its flashing xenon
light was on to assist recovery. By 1515
hours squalls and low clouds came into the
area which reduced visibility to several
hundred yards. The support craft and small
boat proceeded in a direction they believed
would take them to the submersible. Though
separated by only 200 yards, the small boat
lost visual contact with the support craft but
maintained radio contact. The weather was
deteriorating rapidly and winds increased to
35-50 knots with seas of 12 to 15 feet in
height. One hour and 25 minutes after DS-
2000 surfaced, the support craft, not able to
locate either the submersible or the small
boat, radioed the Coast Guard for help. At
1900 hours a Coast Guard aircraft sighted
DS-2000’s light and vectored the support
craft to it. The weather was now so inclem-
ent that retrieval was unacceptable and
the support craft maintained visual contact
with the submersible until 1350 hours the
following day when it retrieved the submers-
ible under extremely trying conditions. The
small boat, on the preceding evening, re-
ported that it had found a buoy and would tie
up to it. At this point its radio went dead.
The description of the buoy as received from
the small boat matched nothing on the
charts of the area. In spite of a 10-foot-high
radar reflector in the small boat, the sea
return was sufficient to mask out any radar

contacts. Early the following morning (6
July) the Coast Guard informed the support
craft that the small boat and its occupants
had been picked up by a Spanish fishing boat
which had planted the buoy to which they
had tied their craft.

Submersible: ALVIN Date: 1965 Reference
(16)

Incident: Diving off Bermuda, the tele-
phone communications failed and the sub-
mersible was separated from the mother ship
for 10 hours. The surface ship began search-
ing without knowing in which direction the
submersible lay. In addition, radio communi-
cation failed, requiring assistance from
Coast Guard aircraft to re-unite the vessels.

Environmental Hazards (Natural)
Submersible: ALUMINAUT Date: NA Ref-
erence (1)

Incident: While on sea trials in Long
Island Sound, ALUMINAUT lost depth con-
trol and made a rapid excursion toward the
bottom. The operational area crossed the off-
shore mouth of the Connecticut River. The
submersible, trimmed for salt water, became
heavy as it entered the fresh water river
flow. The change in buoyancy was calculated
at 3,500 pounds. Immediate action was to
blow ballast tanks, drop shot and power up
with the vertical propeller. Subsequent
water sampling showed fresh water down to
120 feet. The operating area was shifted to
avoid the effects of the river.

Submersible: DEEPSTAR 4000 Date: 21
November 1967 Reference (11)

Incident: Diving off the island of Cozu-
mel, Mexico, DS-4000 was proceeding up-
slope from 4,000 feet deep and observed a
weak current setting SSW, with a 0- to 0.1-
knot drift between depths of 3,350 and 1,400
feet. Ascending through 1,400 feet another
current setting NNE was encountered. The
speed of this current increased rapidly as the
submersible proceeded upslope and reached

691

almost 2 knots at a depth of 900 feet. This
strong current was accompanied by reduced
visibility and made it impossible to control
the vehicle. The dive was aborted and the
vehicle was forced to surface. A similar con-
dition occurred on the following dive off Mis-
teriosa Bank in the Caribbean; in this case
the dive was aborted at 2,550 feet when the
submersible was swept into a spin.

Submersible: FNRS-3 Date: 1955 Refer-

ence (2)

Incident: During a dive into Toulon Can-
yon the bathyscaph bottomed on a mud shelf
at 4,920 feet. While ascending from the shelf,
the bathyscaph’s guide chain apparently
broke loose a block of mud causing a mud
slide or turbidity current. A sediment cloud
was generated which reduced visibility to
zero. In an effort to steer clear of the sedi-
ment cloud, FNRS-3 proceeded across the
canyon on a descending course and ran into
the opposite wall at a depth of 5,250 feet.
After more than an hour’s wait, the sedi-
ment cloud, caused by impact with the oppo-
site wall, had not cleared; the vehicle began
ascent and at a height of 800 feet above the
bottom visibility returned.

Submersible: ALUMINAUT Date: Febru-
ary 1966 Reference (12)

Incident: During a search for a lost hy-
drogen bomb off southern Spain, the sub-
mersible had occasion to make frequent con-
tact with the soft, muddy bottom. Openings
in the vehicle’s keel, to facilitate flooding,
acted as scoops through which sediment en-
tered and accumulated. When this situation
was finally noted, the submersible had
picked up an estimated sediment weight of
4,000 pounds.

Submersible: ALVIN Date: 1967 Reference
(13)

Incident: ALVIN was on a routine geol-
ogy dive on the Blake Plateau, off Charles-
ton, S.C., when shortly after landing on the

bottom at 1,800 feet, a swordfish weighing
about 250 pounds made a deliberate attack
on the submersible. The fish’s bill penetrated
the fiberglass skin between the releasable
forebody and afterbody and became wedged
there by the pressure sphere. The initial
inclination was to continue the dive since no
apparent damage had occurred. Shortly
thereafter, the leak detector system, which
monitors sensitive areas for salt water intru-
sion, showed a positive indication and the
dive was aborted. A post-dive analysis re-
vealed that the leak detector reading was
unrelated to the attack. A swordfish attack
was also experienced by BEN FRANKLIN
during its 30-day drift in the Gulf Stream. In
this case the swordfish did not lodge in the
vehicle or cause any damage.

Environmental Hazards (Man-Made)
Submersible: DEEPSTAR 4000 Date: NA
Reference (14)

Incident: The submersible was oper-
ating off the California coast under the aus-
pices of the U.S. Naval Electronics Labora-
tory. Though DEEPSTAR 4000 had re-
quested Navy clearance to dive in the area,
it had not received permission at the time of
the dive. When the submersible bottomed,
three 5-inch projectiles exploded about 200
yards astern of the support ship. The shore
facility was asked by radio to contact fleet
operations and request that the firing be
halted. Contact was made, firing ceased, and
DEEPSTAR 4000 surfaced and was re-
covered. The support ship was escorted from
the area both by the cruiser which had fired
upon it and a submarine that had surfaced in
the interim. Later it was found that the area
was scheduled for fleet training and the sup-
port ship was mistaken for the target ship
due in the area about the time of the inci-
dent.

Submersible: SEA OTTER Date: 1973 Ref-
erence (15)

Incident: In the process of inspecting
the trash gates of Bennett Dam, Williston

692

Lake, British Columbia, the submersible was
drawn against the gates and held by an
estimated 8-knot current. Initial estimates
placed the current at 2 knots. To free itself,
the operator requested that the generators
be shut down which, in turn, would eliminate
the current. As the current abated, a mass of
water-soaked logs and other debris which
was also held against the gates by virtue of
the currents rained down on the vehicle.
Several hours were required for the sub-
mersible to extricate itself.

Submersible: STAR II Date: 1967 Refer-
ence (NA)

Incident: The vehicle was conducting an
inspection of an offshore oil structure in the
Gulf of Mexico at a depth between 100 and
150 feet. Sudden increase in current strength
and change in direction caused the vehicle to
collide with one of the supporting structures
and to damage its controls beyond functional
ability. Divers were dispatched to assist the
submersible which could not make its way
out of the structure without its controls.
Before the divers arrived, the submersible
drifted free of the structure and eventually
surfaced by blowing ballast.

Launch/Retrieval Incidents
Submersible: ALVIN Date: 16 October 1968
Reference (1)

Incident: The elevator between the hulls
of the catamaran LULU was lowering ALVIN
into the water when the forward, port side
cable parted. The additional load caused the
starboard cable to part and ALVIN slid off
the platform into the water. The pilot, stand-
ing in the sail, swam clear; water was enter-
ing the pressure hull, but the two occupants
made a fortunate and miraculous escape.
The hatch could not be completely closed
during this emergency situation due to the
presence of the vehicle’s control cable ex-
tending from the control center in the sphere
to the portable control box held by the pilot
in the sail. The submersible sank to the
bottom at 5,052 feet and was retrieved in
toto, on 28 August 1969 (Fig. 15.2).

Fig. 15.2 ALVIN after 10'/2 months at 5,052-foot depth. (WHO!)

Submersible: DEEPSTAR 4000 Date:
May 1967 Reference (1)

Incident: DEEPSTAR 4000 was per-
forming a series of test dives at Panama
City, Florida. During launch, the vehicle was
hoisted off the deck of its support ship and
swung over the side. Some 5 feet in the air,
the quick-release launching hook unexpect-
edly opened and dropped the vehicle into the
water. The events surrounding the unex-

693

pected release were examined. As far as
could be determined, the release line was not
fouled nor had it been accidentally pulled.
Examination of the hook showed that under
certain conditions a mechanical open/closed
indicator could point to closed when, in fact,
the hook was only partially latched. It was
concluded that the visual check of the hook
showed a “closed” hook and the OK to launch
was given. The hook, in fact, was only par-
tially closed. It held the vehicle load (18,000

lb) for the lift and 180-degree swing, but the
stop-rotate motion of the crane was enough
to open the hook and drop the vehicle. The
crew was shaken up and some vehicle dam-
age was sustained.

Submersible: DEEPSTAR 2000 Date: NA
Reference (1)

Incident: During a rough water launch,
DEEPSTAR 2000 unexpectedly dropped a
battery which forms part of the vehicle’s
safety system and can be dropped using a
manual cable release. The cable runs from a
manual crank on the pressure hull through
the exostructure to the battery box. Flexing
of the exostructure during the launch was
sufficient to trip the release mechanism and
drop the battery. The exostructure was sub-
sequently stiffened in those areas where in-
teraction with the battery drop cable was
significant.

Submersible: BEAVER Date: Summer
1973 Reference (16)

Incident: Prior to demonstrating their
ability to launch/retrieve the submersible
BEAVER, a perspective contractor to the
vehicle’s owner, International Underwater
Contractors, made modifications to the lift
system which included fairleading a cable
through a shackle welded to the deck of the
ship. With BEAVER attached to the lift de-
vice, a strain was taken on the fairleaded
cable which proved too much for the shackle
weld. The shackle broke loose and fatally
struck an observer in the chest.

Operational Incidents
Submersible: BEN FRANKLIN Date: April
1970 Reference (1)

Incident: BEN FRANKLIN was moored
astern of its anchored support ship when a
sudden storm came up. The combined drag of
the support ship and BEN FRANKLIN
caused a failure in the anchor system and
both vessels were forced onto a reef. The
submersible, having minimal surface propul-

694

sion capability, was damaged in the keel and
battery pod areas. The support ship was
finally able to maneuver itself and BEN
FRANKLIN clear of the reef.

Submersible: BEAVER Date: March 1969
Reference (1)

Incident: BEAVER was being launched
for operations from a marine railway on Cat-
alina Island, California. The weather at this
time was described as “rough” and when the
vehicle reached the point of becoming buoy-
ant the waves caused it to pound on the
runway and inflict damage to the submers-
ible.

Submersible: NEKTON BETA Date: 21
September 1970 Reference (1)

Incident: NEKTON BETA and its sister
submersible NEKTON ALPHA attached lift
lines from a barge to a sunken cabin cruiser
at 230-foot depth some 500 yards off Santa
Catalina Island, California. The ALPHA sub-
mersible surfaced, but BETA elected to re-
main submerged during the lift. At about 50
feet off the bottom the lift lines parted and
the cruiser fell through the water. In doing
so it struck BETA and broke a section out of
a conning tower viewport. BETA flooded and
sank to the bottom where pilot R. A. Slater
was able to exit the vehicle and ascend to the
surface. The observer, L. A. Headlee, per-
ished.

Submersible: GUPPY Date: NA Reference
(1)

Incident: While operating in the Santa
Barbara Channel, GUPPY had been re-
covered in a normal fashion. The sea was
calm and the crew exited the vehicle. The
hatch was open and the hoisting winch cable
was still loosely attached. A sudden sea swell
caused the support ship to roll unexpectedly
and GUPPY slid along the deck until stopped
by the winch cable. If the cable had not been
attached, the vehicle would have probably
gone over the side with its hatch open.

The foregoing incidents demonstrate the
wide variety of related and unrelated events
which may lead to fatal accidents. Analyzing
some 20 different accidents/incidents, the
majority of which are included in the forego-
ing list, Pritzlaff concluded that the need for
good seamanship and maritime sense paral-
leled that of sound submersible design; in
essence, he has euphemistically restated Si-
mon Lake’s observation that “. . . no one
makes a fool of himself. . . .”

An equally interesting point also emerges
from the incidents listed above: 15 out of the
22 different submersibles involved were
either U.S. Navy certified or ABS classified;
the remaining 7 had undergone only their
builder’s quality control program. So it
would appear that a certified or classified
vehicle is no more immune to accidents than
those which are not. Of course, one can only
speculate on how many more accidents there
might have been if those 15 were not certi-
fied, but the majority of the incidents de-
scribed were due either to the method of
employing the vehicle or from environmental
factors, not faulty design or construction.
This is not to imply that some form of certifi-
cation or classification is undesirable, it is
meant to place the cause of accidents in
perspective.

RESCUE POTENTIAL

In the event that a submersible is trapped
on the bottom, and egress is impossible, what
devices are available which may be employed
to rescue the occupants? In the final analysis
there are three means available: divers,
other submersibles and self-propelled, re-
motely-operated, unmanned devices. The se-
lection of which device to use is dependent
upon a host of variables, the prime one being
the nature and depth of the disability. For
this reason, it is difficult to imagine one
device satisfying all of the possible emer-
gency situations. Preliminary to a discussion
of the capabilities of these three devices,
should be a consideration of the rescue phi-
losophy: Underwater transfer of personnel to
a rescue capsule, or recovery of the submers-
ible with the occupants inside.

Underwater Transfer
In the United States there are presently

two devices designed and operated for the
rescue of personnel from a stricken subma-
rine: the DEEP SUBMERENCE RESCUE
VEHICLE (DSRV) and the SUBMARINE
RESCUE CHAMBER (SRC).

DEEP SUBMERGENCE RESCUE VEHI-
CLE-I & 2:

DSRV-1 and 2 (Fig. 15.3) were designed to
mate with a stricken submarine, take aboard
24 personnel at a time and return them to a
surface support craft or a mother submarine.
They are air, sea (surface and subsurface)
and land transportable and capable of rescue
from 5,000 feet. The distressed submarine
must have a 6-foot-diameter flat plate (ma-
chined to specific tolerances) surrounding its
hatch to which the DSRV’s transfer skirt can
mate, pump out entrapped water, and
thereby effect a pressure differential which
holds it to the submarine. At this stage the
DSRV’s and submarine’s hatches are opened
and personnel transferred. The procedure is
reversed to unmate. No mechanical linkages
are required, but the area surrounding the
plate and hatch must be cleared of obstruc-
tions. A brief rescue scenario of the DSRV is
presented in Figure 15.4.

SUBMARINE RESCUE CHAMBER (SRC):

The SRC (Fig. 15.5) is a rescue cylinder
carried aboard all U.S. Navy ASR’s (Auxil-
iary Submarine Rescue) and it is capable of
rescuing submarine personnel from depths

Fig. 15.3 The DSRV-1, capable of rescuing 24 personnel from a military submarine
at 3,000 feet. The black and white bell on the underside is configured to mate with the
distressed submarine. (U.S. Navy)

ASR: ALTERNATIVE LAUNCHING PLATFORM

=e MATE, DISCHARGE RESCUEES,
FROM RECHARGE BATTERIES
STAGING a —— MOTHER SSN
PORT ui
DISENGAGE
ten OS

SEAL
RP DISENGAGE
b aS

ee

7 ROUND TRIPS FROM MOTHERSHIP ae fe
TO DISTRESSED SSN TO REMOVE Beate
FULL COMPLEMENT OF 156 MEN
a 186 RESCUEES
TOTAL TIME OF RESCUE DISTRESSED SUBMARINE
OPERATION: 16 HR-58 MIN
CENTERLINE OF HATCH SYSTEM —}
DSRV SKIRT NOTES:
aM MAX. RADIAL
SHOCK MISALIGNMENT 1. FLAT APPROACH MAX. LOAD IMPACT
ABSORBER OF SKIRT 76,000 LB TOTAL OVER THE CONTACT
AND RESCUE SEAT AREA.
2. POINT IMPACT LOAD AT ANGULAR
APPROACH IS 30,000 PSI MAX.
3, THE LOAD THE SKIRT WILL EXERT ON
30% IN. THE RESCUE SEAT AFTER DEWATERING
—— RADIUS —> THE SKIRT IS HYDROSTATIC PRESSURE
26% IN. ACTING OVER THE SEALED AREA OF
RADIUS 2,700 SQUARE INCHES.
4. 290 PSI ADDITIONAL LOADING MAY BE
EXPECTED ON THE DOWNSTREAM SIDE
ee SEE FOR A 2-KNOT LATERAL CURRENT.
41% IN. RADIUS —~ ve Deae
RESCUE SEAT
[ —________— }

en

SUBMARINE DECK

ESCAPE TRUNK
HAND WHEEL

Fig. 15.4 DSRV rescue scenario (top). Details of typical submarine rescue seat (bottom).

696

NOTE:

—~—— CABLE AND HOSE GROUP
8
!

144 IN.

LOWER HATCH COVER ASSEMBLY

DOWN-HAUL CABLE
Ps PROTECTING RING

SS ae (FOR SHIPMENT)
L__55 In. GASKET
DIAM.

CENTERLINE OF HATCH SYSTEM

29 7/16 IN.
RADIUS

25 3/16 IN._.y
RADIUS

SUBMARINE
RESCUE HATCH BAIL
CHAMBER

FAIRING

HATCH
RESCUE SEAT

—

SUBMARINE DECK
ESCAPE TRUNK

HATCH CAVITY DRAIN LINE

THE LOAD P THE SRC WILL EXERT ON THE RESCUE SEAT AFTER DEWATERING THE LOWER CHAMBER IS

HYDROSTATIC PRESSURE ACTING OVER THE SEALED AREA PLUS THE SRC NET BUOYANCY AND THE
TENSION IN THE HAULDOWN CABLE.

Fig. 15.5 Submarine rescue chamber (top). Typical disabled submarine rescue seat (bottom).

697

to 850 feet. In theory, the chamber is oper-
ated as follows: A stricken submarine re-
leases a buoy to the surface which is at-
tached to a 7/s-inch-diameter wire. The ASR
establishes a four-point moor over the sub-
marine and brings the buoy aboard where it
cuts it off and attaches the wire to a reel on
the base of the SRC. The chamber is then
lowered into the water and its two operators
reel the positively buoyant chamber down to
the submarine where a hemispherical skirt
on the bottom of the chamber mates with a
compatible surface surrounding the subma-
rine’s hatch. At this stage the operators blow
water out of the mating skirt and, to bring
pressure in the mating skirt down to atmos-
pheric, the interior of the skirt is vented to
the surface. Two separate air hoses lead
from the ASR to the chamber: One hose is
used solely to vent the skirt and the second
hose supplies air to power the downhaul reel,
provide breathing gas and blow out the mat-
ing skirt. Although those functions are con-
trolled by the personnel within the chamber,
they must rely on the surface for high pres-
sure air. With the interior of the skirt dry
and at atmospheric pressure, the hatch in
the bottom of the hull and the hatch on the
submarine can now be opened for ingress of
trapped personnel. In addition to the two
operators, six rescuees are routinely accom-
modated, but in an emergency far more may
squeeze into the 7-foot ID, 7-foot-high cylin-
der. To ascend, the hatches are shut, seawa-
ter is readmitted to the skirt to break the
pressure differential and it unreels its way
to the surface. Where depth allows, a diver
can attach a suitable cable to the hatch to
perform the same function. Similar to the
DSRV, the SRC requires a flat, steel base at
least 4 feet 7 inches across and suitably
machined to effect a watertight seal. In addi-
tion, the submarine’s hatch cover must have
a point on it to which the downhaul cable can
be attached.

Both the DSRV’s and the SRC can accom-
modate hatches up to 28 inches in diameter
which will allow them to open 80 degrees. In
order to accommodate either the DSRV or
the SRC, a submersible must meet the re-
quirements listed below.

1) DSRV Requirements: The dimensions of
the DSRV skirt are shown in Figure 15.6.

Since the submarine’s hatch must open up-
ward into the skirt cavity while mated, its
dimensions are critical.

The skirt rests on the rescue seat, which is
a reinforced circular steel area surrounding
the escape hatch. The rescue seat must have
a minimum outer diameter of 65 inches and a
maximum inner diameter of 44.5 inches. Ad-
ditionally, the area beyond the rescue seat
must be in the same plane as the rescue seat
and clear of obstructions and projections out
to a diameter of 89 inches to accommodate
the DSRV shock mitigation ring. The
strength required of the rescue seat is de-
pendent upon the depth of the rescue opera-
tion. Figure 15.4 describes the loads applied
to the stricken submarine.

The skirt mating flange contains a rubber
gasket designed to seal rescue seat irregular-
ities up to 0.150 inch. The surface of the
rescue seat must thus be flat within 0.150
inch at all rescue depths and under the loads
imparted by the DSRV.

> 44 1/2-IN, DIAM.———+},
50 3/8-IN. DIAM.

NO PART OF THE DISABLED
SUBMARINES HATCH CAN
INFRINGE ON THIS SPACE
ENVELOPE

es ed

DSRV HATCH OPEN

-53,00 IN.-DIAM.

Fig. 15.6 DSRV skirt (bottom) and SRC lower chamber (top) dimensions.

The DSRV is equipped with a haul-down
system to assist it in mating in unfavorable
underwater currents. The system consists of
a winch and cable located in the DSRV skirt.
A grapnel hook at the end of the cable is
lowered and attached to the escape hatch.
The winch is then operated to haul the DSRV
down to the rescue seat. A suitable bail must
be provided on the escape hatch.

It is necessary to have an air sampling and
pressure equalization valve operable from
outside of the submersible. The fitting must
be located within the area covered by the
skirt. Its purpose is to permit sampling of the
air within the submersible for toxicity, tem-
perature, and radioactivity, and to equalize
pressure between the DSRV and the subma-
rine. The DSRV is capable of operating with
an internal pressure of 5 atmospheres abso-
lute.

2) SRC Requirements: The SRC mating
surface is a construction around the bottom
of the lower chamber consisting of a rubber
gasket and a steel retaining ring. The 1%/a-
inch-wide pure rubber gasket at the mating
surface provides a seal against sea pressure
when the SRC is mated to the submarine.

The disabled submersible must have an
equivalent mating surface around its hatch
to be used for the rescue. The strength re-
quired of the rescue seat depends on the
depth at which the mating will be performed.
Since the system has a depth capability of
850 feet, the static load on the rescue seat
after dewatering and venting of the lower
chamber will be the hydrostatic pressure at
850 feet acting over the corresponding area
exposed to the lower pressure plus the net
buoyancy of the chamber and the force ex-
erted by the pressure and the force exerted
by the haul-down cable. Seat loading of 3,640
psi will therefore result if the mating sur-
faces are perfectly flat. A safety factor
should be utilized to allow for surface irregu-
larities, corrosion, and minor impact loads.
The strengthened area of the rescue seat
should have a minimum outside radius of 35
inches and a maximum inside radius of 23
inches, both as measured from the center of
the submersible’s hatch.

The rubber gasket at the SRC mating sur-
face is designed to seal rescue seat surface
irregularities such as scratches, nicks, and

699

waviness. The gasket is capable of sealing
gaps up to !/s inch. The seal limitation re-
quires the rescue seat to be flat within 1/s
inch. Figure 15.5 (bottom) illustrates the
mating of an SRC with a typical submarine
hatch.

Projections and obstructions above the
hull of the disabled submarine in the vicinity
of the rescue seat present hazards to the
SRC mating surface and seal. Damage to
these systems could prevent mating. In the
area of the submersible’s rescue hatch there
can be no projections above the submarine
hull which would impact an SRC descending
vertically to a submersible that is inclined 30
degrees from the vertical in either the fore-
and-aft or athwartships planes, or both.

If the haul-down cable is not permanently
attached to the submersible, a strengthened
connection point must be available at the
hatch to permit hook-up of the down-haul
cable by external means. The maximum
depth at which this can be accomplished is a
function of ASR maximum deep diving capa-
bility, and is generally around 400 feet. The
connection point should be as nearly cen-
tered on the hatch as possible. The padeye or
bail must be able to withstand a load of
12,500 pounds.

In addition to the cable connection point,
two other requirements are placed on the
submarine hatch. To permit egress from the
submersible the hatch must be of such size
to allow it to be opened, without interfer-
ence, into the lower chamber of the SRC with
the SRC mated to the submersible. SRC’s
lower chamber minimum internal clearances
are shown in Figure 15.6.

The hatch area should include tiedown at-
tachment points so that the SRC can be
firmly secured to the submersible before the
haul-down cable is slacked. The SRC has four
hold down rods with shackles on their ends
which will be emplaced by the rescue crew
before the hatch is opened. The tiedown
points must be padeyes or staples with open-
ings through which the 1!/s-inch-diameter
pins of the hold down rod shackles can be
passed and secured. They must be placed
around the submarine’s hatch inside the
area of SRC/submarine mating (orientation
is not critical). The tiedown attachments
must be individually capable of withstanding
a holding down load of 10,000 pounds.

In the event that communications with a
disabled submersible cannot be established,
the quality of the atmosphere within the
submersible must be determined before its
hatch is opened. Failure to do so could result
in harm to the SRC operators from heat,
toxicity, or radioactivity. It is therefore nec-
essary to have an air sampling fitting with a
stop valve operable from outside of the sub-
marine’s pressure hull. The fitting must be
located within the area covered by the SRC’s
lower chamber, perferably built into the sub-
mersible’s hatch.

The SRC can, under emergency conditions,
equalize pressures between the disabled ve-
hicle and the SRC up to 290 feet equivalent
depth. The SRC operators can also determine
if internal submersible pressures exceed 290
feet equivalent depth, but cannot effect a
rescue at pressure greater than this. Inter-
nal submersible pressures in excess of 290
feet equivalent depth represent a danger to
an SRC and are sufficient reason to abandon
the rescue mission.

The SRC carries portable ballast consisting
of lead pigs. Water ballast cans can also be
carried as portable ballast. In order to main-
tain proper SRC buoyancy, the portable bal-
last is placed in the submersible after the
rescuees are taken aboard.

In view of the requirements outlined
above, no past or present manned submers-
ible (military or civilian) was or is amenable
to rescue by the DSRV or SRC; this includes
the DSRV’s themselves. Retrofitting of sub-
mersibles to accommodate these rescue sys-
tems is technically feasible in most cases, but
the cost and degradation in vehicle maneu-
vering and handling characteristics would be
unacceptable to vehicle owners. Some appre-
ciation for the cost involved may be gained
by considering that it requires some $150
thousand to modify a military submarine for
rescue. Consequently, the U.S. Navy has con-
cluded that the only feasible means of rescu-
ing occupants of a stricken submersible is by
recovering (salvaging) the vehicle.

Recovery

Three situations can be foreseen where a
submersible is unable to surface: 1) It is too
heavy to ascend, e.g., PISCES III; 2) it is

700

restrained from ascending due to an entan-
glement, e.g., JOHNSON SEA LINK, or over-
head obstruction, and 3) the occupants are
unable to function. In such cases the rescue
device must be capable of attaching a suita-
ble line for surface recovery or freeing, i.e.,
cutting, the vehicle from its obstruction. To
accomplish these tasks the rescuing device
must possess a manipulative capability of
some degree, it must be maneuverable, and
it must provide its operator with a direct or
remote view of the submersible. There are
three systems which provide those capabili-
ties; divers, manned submersibles and un-
manned devices. It is not the intent to com-
pare these three capabilities; each one offers
unique attractions which may be the best
answer to a specific situation. Instead, the
present and near-future capabilities of each
system will be simply listed. In the final
analysis, the individual in charge of a rescue
operation will have to decide for himself
what capability is the best, assuming all are
available.

The following capabilities were taken from
a presentation by Captain Edward Clausner,
Jr., USN, at the Marine Technology Society’s
8th Annual Conference and Exhibition,
Washington, D.C., in September 1973 and
entitled Rescue, Recovery, and Salvage of
Submersibles. As Captain Clausner ex-
plained, the present assets for recovery not
only reflect Navy capabilities, they include
essentially all U.S. capabilities, both com-
mercial or military, because the Supervisor
of Salvage maintains a contract with a civil-
ian firm to provide any assistance available
in a Naval emergency from the commercial
sector. This assistance is also available to
any non-military submersible in an emer-
gency; therefore, the total assets of the U.S.
are at the stricken submersible’s service.

Divers

There are literally thousands of Navy di-
vers available who can be quickly deployed
and diving with MK V Air Hard Hat rigs to
190 feet while breathing compressed air. The
advantage they offer, by virtue of their mobil-
ity, is severely hampered by the disadvan-
tages of short bottom time and long decom-
pression time. Below 190 feet the Navy would
deploy one of two systems: the MK V Helium

Hard Hat, or the Deep Dive System (MK I
and MK IT).

MK V Helium Hard Hat: (Fig. 15.7)

This system relies upon a hard hat and
umbilical to a surface support ship and uses
helium-oxygen breathing gasses. The bottom
time is measured in minutes, but under ideal
conditions a depth of 450 feet is attainable.
Ideal conditions include a calm sea, the sup-
port ship in a four-point moor, adequate med-
ical facilities and experienced divers. Normal
diving with this system is conducted to 300

feet and the capability exists aboard every
U.S. Navy ASR; these are stationed through-
out the world and cruise at a speed of 13
knots.

Deep Dive Systems MK I and MK II: (Fig.
15.8)

Also using helium-oxygen breathing gas
mixtures, the Navy’s Deep Diving Systems
are for saturation diving and theoretically
provide extended bottom time to 1,000 feet
deep. The systems are presently located on
the east (Norfolk, Va.) and west (San Diego,

Fig. 15.7 MK V Helium Hard Hat. (U.S. Navy)

HEIGHT—OVERALL: 144 INCHES
DIAMETER: 79° OD
MATERIAL OR CONSTRUCTION: HY-80
CAPACITY: 2 MEN
DURATION: 30 HOURS

SUPPORT FRAME

DEPTH:
TURNBUCKLE

PORTABLE CCTV CAMERA

ii
LIGHTS (INCANDESCENT) CEO aye aa NI
ITO) a)

Ie
ON

BALLAST RELEASE
LINKAGE

SUPPORT FRAME BUMPER DOWNHAUL WINCH

JUNCTION BOX

DROPABLE BALLAST

PERSONNEL TRANSFER CAPSULE

—— SPCC (STRENGTH, POWER, COMMUNICATION CABLE)

Dm) ZR
fe a= i

Geel
i = i} J

DDC (DECK DECOMPRESSION CHAMBER) EL (ENTRANCE LOCK)

Fig. 15.8 Mark | DDS.

702

Calif.) coasts of the U.S. and are designated
MK I and MK II, respectively. The DDS-MK
I supports two 2-man teams of divers
through a 14-day mission; the DDS-MK IT is
designated for saturation diving (i.e., where
one spends about 24 hours at depth) and
supports two 4-man teams for an extended
mission time. Both systems require a four-
point moor to operate and rely on an ASR to
plant this moor. The MK I is barge-mounted
and towed at a speed of 3-5 knots; the MK IT
is aboard the IX-501 which is capable of
about 8 knots. A MK IT DDS is now aboard
the newly launched ORTOLANE (ASR-22)
and PIGEON (ASR-21), and both are com-
pletely independent in deploying the system
and capable of 18 knots. The system will
undergo operational evaluation in December
1973 and is tentatively scheduled to be oper-
ational aboard PIGEON by June 1974. The
MK ITI aboard ORTOLANE is scheduled to be
operational 6 months later (Jan. 1975).

There are also thousands of Navy divers
trained in the use of compressed air scuba to
depths of 130 feet and they are available in
the event of an emergency. One can find
exceptions to the depths noted above and
show cases where they have been exceeded.
In extreme cases, there is no doubt that one
might exceed these depths to effect a rescue,
but to plan on such an extension before the
emergency occurs may result in the loss of
additional life in the course of saving others.

As stated, the above describes U.S. Navy
diving capabilities; for a detailed description
of commercial, as well as Naval capabilities,
the reader is referred to reference (17) which
summarizes the current state-of-the-art in
ambient diving techniques and equipment. It
is sufficient to note that Galerne (18), as
early as 1971, stated that 750-foot working
dives in 28°F water would be no problem for
his corporation, International Underwater
Contractors of New York, and that the
French firm COMEX conducts full working
dives at 1,500 feet “. . . on an almost ho-
hum basis.”’ One must realize, however, that
such dives are supported by extensive sur-
face equipment which requires time for
transportation and mobilization on the
scene. Ambient diving to 500 or 1,500 feet
consists of far more than merely donning on

703

scuba gear and plunging in. Support facili-
ties, hoses, cold water protection, medical
facilities, a well-trained and highly varied
team and a host of other requirements must
be met before the dive commences. As we
have seen, 80 percent of all submersibles
have no more than 48 hours of life support, a
very short time to martial the assets re-
quired for employing the deep, ambient-pres-
sure diver.

Manned Submersibles

There are seven operational manned sub-
mersibles in the U.S. Navy, with depth capa-
bilities ranging to 20,000 feet. In addition to
these are some 25 other privately-owned ve-
hicles believed operating full or part time in
the United States. This latter figure is likely
to be conservative, because it assumes that
all vehicles are known and it includes only
one from a class of vehicles, such as the K-
250. A further difficulty in tabulating sub-
mersibles is that there is no requirement to
register their building or report their opera-
tions. Hence, the numbers of submersibles
herein should be considered as best esti-
mates. The operational status, home port
and even the owner of a given submersible is
subject to rapid change.

Table 15.1 presents the characteristics of
submersibles believed operating throughout
the world. “Operating”’ in this sense implies
that the submersible can be ready to dive
within 2 days to 1 week, in spite of the fact
that it may not have dived for some time.

Table 15.1 can be viewed in two ways: It
reveals not only the capabilities for rescue,
but also the candidates for rescue. Conse-
quently, the following is both a list of poten-
tial rescuers and rescuees:

0-1,000 feet: 50% (30 vehicles)
1,000-2,000 feet: 27% (16 vehicles)
2,000-6,500 feet: 15% (9 vehicles)
6,500-36,000 feet: 10% (5 vehicles)

Regarding manipulator capability, of the
55 vehicles, where data is available, 65 per-
cent have one or two manipulators of widely
varying ability. As a means of transportation
and support of diver-rescuers, eight have a
lock-out feature.

Unmanned Vehicles
Unmanned vehicles of the CURV variety

TABLE 15.1 OPERATING SUBMERSIBLES (NOV. 1973)

Oper. Life Diver Hatch
Country Submersible Home Depth Weight Support Manipu- Lock- Diam.
Port (Ft) (Tons) Crew (Man-Hrs) lators out (in.)
Canada AUGUSTE PICCARD Vancouver, BC 2,500 185 44 2112 0 No 30.1
PISCES IV Victoria, BC 6,500 10 3 76 2 No 19.5
PISCES V Vancouver, BC 6,500 10 3 76 2 No 19.5
SDL-1 Halifax, N.S. 2,000 14.3 6 204 2 Yes 25
SEA OTTER Vancouver, BC 1,500 S215 192 1 No 19
AQUARIUS | Vancouver, BC 1,200 4.5 3 108 1 No 19
England PISCES | Barrow-in-Furness 1,200 Ue 2 100 2 No 18
PISCES II Barrow-in-Furness 2,600 12 3 100 2 No 19.5
PISCES III Barrow-in-Furness 3,600 12 3 100 2 No 19.5
VOL-L1 Barrow-in-Furness 1,200 13 4 192 1 Yes 22
PC-8B London 800 5.5 2 48 1 No 24
France ARCHIMEDE Toulon 36,000 61 3 108 1 No 17.7
SP-350 Monaco 1,350 4.2 2 96 1 No 15.75
SP-500 (2@) Monaco 1,640 2.65 1 12 1 No 15.75
SP-3000 Marseilles 10,082 8 3 144 1 No 15.75
SHELF DIVER Marseilles 800 8.5 4 172 0 Yes 23
GRIFFON Toulon 1,970 12 3 100 1 No NA
Netherlands NEREID 330 Schiedam 330 11 3 96 2 No 22.8
NEREID 700 Schiedam 700 7.5 2 NA 1 Yes 22.8
Italy PC5C NA 1,200 5/5) 23 180 0 No 23
PS-2 Milano 1,025 6 2 72 1 No NA
TOURS 66 Sardinia 984 10 2 96 1 No 26.4
Japan HAKUYO Tokyo 984 6 4 144 1 No 23.6
KUROSHIO II Hokkaido 650 12.5 4 96 0 No /i\72
SHINKAI Tokyo 1,968 100 4 192 1 No 19.6
YOMIURI Tokyo 972 41 6 492 1 No 25
Taiwan TOURS 64 Taipei 948 10 2 96 1 No 26.4
United States ALVIN Mass. 12,000 16 3 216 1 No 19
BEAVER New York 2,000 17 4 360 2 Yes 25
DEEP QUEST San Diego 8,000 52 4 204 2 No 20
DEEPSTAR-2000 Annapolis, Md. 2,000 8.75 3 144 1 No 15.75
DSRV-1&2 San Diego 5,000 38 27 729 1 No 25
GUPPY-1 Chester, Pa. 1,000 2.5 2 72 0 No 20
JOHNSON SEA LINK Ft. Pierce, Fla. 1,000 9.5 4 72 0 Yes 24
NAUTILETTE (3@) Ill., Mich., Inc. 100 1.2 2 2 0 No 22
NEKTON (3@) Irvine, Calif. 1,000 2.35 2 48 1 No 18
NR-1 New London, Conn. NA 400 7 45days NA NA NA
PC3-X Austin, Tex. 150 2.3 2 16 0 No 19
PC-3A (2@) Hawaii 300 2.3 2 20 0 No 19
PC-14 Galveston, Tx. 1,200 5 2 60 1 No 19
QUESTER | Brooklyn, N.Y. 650 NA NA NA NA No NA

704

TABLE 15.1 OPERATING SUBMERSIBLES (NOV. 1973) (Cont.)

Oper. Life Diver Hatch
Home Depth Weight Support Manipu- Lock- Diam.
Country Submersible Port (Ft) (Tons) Crew (Man-Hrs) _ lators Out (in.)
United States SEA CLIFF San Diego 6,500 24 3 100 2 No 19.75
SEA RANGER Mt. Clemens, Mich. 600 8 4 120 2 No 20
SNOOPER Torrance, Calif. 1,000 2.3 2 24 1 No 24
STAR II Honolulu 1,200 5 2 48 1 No 20
SURVEY SUB I Houston, Tex. 1,350 ie25es 216 0 No 24
TRIESTE II San Diego 20,000 87.5 3 72 1 No 19.8
TURTLE San Diego 6,500 24 3 100 2 No 19.75
Soviet Bloc SEVER 2 NA 6,562 NA 3 72 NA No NA
GVIDON NA 810 NA 4 24 NA No NA
TINRO| NA 984 NA 2 96 NA No NA
DOREA NA NA NA 1 NA NA NA NA
West Germany MERMAID I/II New York 984 6.3 2 120 0 No 24
MERMAID III/IV New York 650 10.5 4 120 0 Yes 24

(Table 15.2) offer many capabilities of the
manned vehicles, with the added advantage
of virtually unlimited endurance and no man
in the system to add another rescuee. On the
other hand, they all have a cable to the
surface which may foul or limit maneuvera-
bility and they are subject to the same elec-
tro-mechanical malfunctions as the manned
submersible.

The U.S. Navy’s present and near-future
capabilities in tethered unmanned vehicles is
presented in Table 15.2; it is germane to note
that CURV ITI, in addition to PISCES II and
V, attached a lift line to the stricken PISCES
IIT in its rescue from 1,575 feet in September
1973.

To the capabilities of the unmanned de-
vices must be added the ALCOA SEAPROBE
(Fig. 15.9). Operated by Ocean Search, Inc., a
subsidiary of Aluminum Company of Amer-
ica, SEAPROBE offers the advantages of an
unmanned vehicle coupled with a lift capac-
ity of 200 tons from 6,000 feet. A list of
SEAPROBE’s characteristics is presented in
Table 15.3 and a detailed discussion in refer-
ence (19).

The working end of the ALCOA SEA-
PROBE system is located at the end of a pipe
string made of 60-foot segments of drill pipe

705

threaded together to reach the depth re-
quired. A cable affixed to the pipe provides
the necessary electrical power, telemetry
control signals, and data transmission cir-
cuits between the shipboard control consoles
and the sensor systems.

The basic search “pod” deploys side-scan
sonar to sweep a 2,400-foot path along the
sea floor. The pod is configured with forward
looking sonar, television, still camera, lights
and a releasable acoustic beacon to use in
marking specific targets. Heavy object recov-
ery devices are available which utilize elec-
tro-mechanical and hydraulic systems for
closure and holding control. Precise position-
ing of the recovery device with respect to the
target is by sonar and transponder sensing
devices in concert with remotely monitored
television and target illumination systems.

The ALCOA SEAPROBE was on the scene
of the JOHNSON SEA LINK tragedy, but
recovery was completed before it could be
brought into play.

Such is the variety of devices which may
be employed to retrieve a distressed sub-
mersible. In the final analysis, the rescuing
apparatus may well be something never in-
tended for such purposes. In the JOHNSON
SEA LINK incident, both divers and a

TABLE 15.2 U.S. NAVY TETHERED UNMANNED SUBMERSIBLES

CURV II CURV III RUWS SNOOPY SCAT
Weight, Lb 3,000 4,500 4,300 50 400
Length, Ft 15 15 10.7 3.6 6
Max. Depth, Ft 2500 7000 20,000 100 2000
Radial Excursion, Ft 600 (Whip) 600 (Whip) 1000 (Whip) * 200 500
Tether, In. (OD) 1.25 (Buoyed) 1.25 (Buoyed) 0.9 (Buoyant) 0.75 5/8 (Buoyant)
Propulsion, Hp 30 (Elec) 30 (Elec) 15 (Hydr) 0.3 (Hydr) 5 (Hydr)
Speed, Knots 3 2 3 2 2
Sonar CTFM, PPI CTFM, PPI CTFM, PPI None Head Following
Aural CTFM
TV Camera 2 2 Head Following 1 Head Following
Stereo
Manipulator 4 Function 7 Function i Grasp Function 2 Function

*From Primary Cable Termination (PCT).
**Master-Slave Manipulator and Rate-Controlled Grabber.

Fig. 15.9 The ALCOA SEA PROBE. (Ocean Search Inc.)

706

manned submersible (PC-8) were unsuccess-
ful. At the eleventh hour, a device used by
the Naval Ordnance Laboratory, Ft. Lauder-
dale, Florida, to inspect underwater hard-
ware (Fig. 15.10) was affixed with a danforth
anchor and “conned” by the submersible’s
pilot to a point where the anchor fortuitously
hooked the submersible and the R/V A.B.
WOOD IT pulled it free.

TIME-LATE

In view of these, and other national and
international assets, it would appear that
rescue is inevitable; unfortunately this is not
the case. Except for the DSRV’s (which are
not yet considered operational), none of
these assets are on a standby basis to re-
spond to distressed submersibles and all of
them may be either working elsewhere or
inoperative when the emergency arises. Ad-
ditionally, many may find that transporta-
tion to the disaster scene is unavailable. The
problem, as Captain Clausner termed it, is

243 feet

TABLE 15.3 ALCOA SEAPROBE CHARACTERISTICS

Length

Beam 50 feet

Draft 14 feet (Propeller depth)

Displacement 1700 tons

Speed 10 knots

Range 6,600 miles

Endurance 45 days

Main Power Two 800 kW diesel-electric generators

Auxiliary Power Two 250 kW diesel-electric generators

Propulsion Two Voith-Schneider cycloidal omnidirectional propulsion units

Auxiliary Deck Equipment

Ship Control
Primary Ship Construction Material

Derrick

Drawworks
Pipe

Pipe Handling
Berthing

Two 5-ton cranes
Oceanographic winch-interchangeable drums

Decca ship control consoles on bridge and in search/recovery control center

5456-H117 aluminum plate
5456-H111 aluminum extrusions
Height: 132 feet (above water line)
Capacity: 250-ton hook load with safety factor of 2
Material: 6061-T6 aluminum tubing
5456-H321 aluminum plate

EMSCO 800 with 600 hp motor generator power supply for DC control

4y," external upset-internal flush
Sections 60 feet in length
Semi-automatic pipe handling system
All spaces air conditioned

Crew — 30
Scientific party — 19

TIME-LATE. Essentially, TIME-LATE re-
fers to the passage of time involved from the
occurrence of an event (disabling of the sub-
mersible) to the point where rescue is no
longer possible. In a submersible “‘time”’ be-
gins when the hatch is closed, and “late” is
invoked when life support expires. In a hypo-
thetical situation, from the moment the
hatch is closed the following events occur
before rescue:

1) Descend and work for some period of

time

2) Emergency occurs: Evaluate and make
decision whether or not additional help
is required

3) Report emergency

4) Ascertain availability and martial as-
sets

5) Transport available assets to emer-
gency scene

6) Locate submersible

7) Deploy assets, attempt rescue.

With a general limit of 48 hours the chances

707

of all the above occurring before “late” is
reached are indeed slim. Let us examine one
of the most recent incidents in the light of
TIME-LATE.

PISCES IIT Incident:

The Vickers Oceanics Ltd. submersible was
in the process of retrieval when the aft ma-
chinery sphere hatch cover was torn off and
the sphere flooded. The vehicle sank to 1,575
feet and landed stern-first on the bottom
some 0.95 to 1.5 tons heavy and 150 nm
southwest of Cork, Ireland. In attendance at
the time of the incident was the support ship
VICKERS VOYAGER. The dive commenced
at 0115 hours on 29 August 1973 and life
support for the two occupants was subse-
quently estimated to last ‘“. . . well past
midday” on 1 September (6), a total of 85.75
hours assuming “. . . well past midday” to
be 1500 hours. This value was reduced by 8
hours 3 minutes due to use of life support
during the dive to 77 hours 42 minutes. The
major assets used in the recovery were:

Fig. 15.10 On 18 June 1973 this Naval Ordnance Laboratory apparatus was lowered to 350 feet from the research ship A. B. WOOD // and pulled the JOHNSON SEA LINK tree of its
entanglement in a scuttled destroyer. Equipment on the towed device includes a television camera, an underwater light, compass and two battery-powered motors. The grapnel was
attached for the SEA LINK recovery. (U.S. Navy Ord. Lab.)

708

a) VICKERS VOYAGER: Support ship for
two rescue submersibles

b) RFA SIR TRISTAM: The nearest avail-
able ship to which the Vickers communi-
cation team transferred while VICKERS
VOYAGER transited to Cork to pick up
the two submersibles PISCES II and
PISCES IV. This vessel was relieved of
its duties by HMS HECATE arriving
some 11 hours after SIR TRISTAM.
PISCES II: A 3,500-ft submersible be-
longing to Vickers and working at the
time some 150 miles from England
aboard VICKERS VENTURER in the
North Sea. This vehicle was transferred
to the rig supply vessel COMET, carried
to Teasdock, England, thence to Teeside
Airport where it was loaded aboard a
Hercules aircraft and transported to
Cork for loading aboard VICKERS VOY-
AGER.

d) PISCES V: A 6,500-ft submersible be-
longing to International Hydrodynam-
ics, Ltd., Vancouver, B.C. and working
on the east coast of Canada. It was
subsequently airlifted from Halifax,
N.S., to Cork and thence aboard VICK-
ERS VOYAGER.

e) CURV IIT: An unmanned, tethered, self-
propelled vehicle located in San Diego,
California and belonging to the U.S.
Navy. CURV was subsequently airlifted
to Cork and loaded aboard JOHN CAB-
OT for transporation and deployment
to the scene.

f) JOHN CABOT: A Canadian cable laying
vessel under contract to the U.S. Navy
and tied up at Swansea, Wales. JOHN
CABOT would serve as support ship for
CURV III and as retrieval ship for
PISCES III.

g) AEOLUS: A U.S. Navy salvage ship
working in the area and ordered to the
scene to assist where possible.

The salvage scheme decided upon for
PISCES III was to insert “toggle” hooks into
its open machinery sphere and lift it up from
the surface. The toggle hooks were fabri-
cated by Vickers in England immediately
upon notification of the emergency. Eventu-
ally, three lines were attached to PISCES
III: The first (4-in. polypropylene) was by
PISCES V to the port motor guard (this line

a

(©

709

was initially attached to the lift padeye, but
fell out and hooked into the guard); the sec-
ond (31/2-in. polypropylene) was a toggle in-
serted into the machinery sphere by PISCES
II and the third (6-in. braided nylon) into the
same location by CURV IIT. At 60 to 100 feet
deep, a line (4-in. braided nylon) was passed
through PISCES III's lift padeye by divers,
and on the surface a 16-ton snap hook and
25-ton wire combination, plus flotation bags,
were also attached by divers. Throughout
the entire incident all major assets (manned
and unmanned vehicles) experienced mal-
functions. This could be anticipated in any
like incident and the details are unnecessary
for this narrative. Significant, however, was
PISCES III’s life support: 15 minutes after
landing on the bottom life support was esti-
mated to last through 0800 hours on 1 Sep-
tember, at 1251 hours on 31 August it was
estimated to last until 1200 hours, and fi-
nally estimated at 0830 on 1 September to
last until well past midday. The builder’s
(International Hydrodynamics) advertised
life support for this submersible is 72 hours;
Vickers Oceanics (the vehicle’s owner) stated
(in an advertising brochure) that it was
about 60 hours. The additional 13 to 25 hours
was either; a) always there or b) obtained by
controlled breathing and limited movement
of the occupants.

The major events of this rescue are shown
in Table 15.4 and the location of lift lines in
Figure 15.11. With approximately 1 hour and
43 minutes of life support remaining, the
crew of PISCES III can be thankful they
were not 250 miles, rather than 150 miles
from Cork. A mere 3 or 5 hours longer trans-
iting time from Ireland to the emergency
scene could have measured the difference
between life or death.

REFERENCES
1. Pritzlaff, J. A. 1972 Submersible safety
through accident analysis. Mar. Tech.
Soc. Jour., v. 6, n. 3, p. 33-40.

. Cousteau, J. Y. 1963 The Living Sea.
Harper and Row, Publishers, New York.

. Forman, W. R. 19 Oct 67 Naval Weapons
Center, China Lake, Calif. (personal com-
munication)

29 Aug.

30 Aug.

31 Aug.

1 Sept.

0000 -
0500:
1000 -
1500 -
2000 -
200:
0400 -
0800:
1200 +
1600
z000:
5400:
0400:
0800:
1200 «
1600 «
2000 «
“i
0400 -
0800 -
1200 «

1600 «

TABLE 15.4 PISCES I1] RESCUE EVENTS.

— Dive Commenced

— Hatch Off

— Emergency Reported
PISCES 11 Summoned (1003) from North Sea
PISCES V Summoned (1046) from Halifax

— CURV Summoned from San Diego
— JOHN CABOT Summoned
— SIR TRISTRAM Arrives/VO YAGER Departs

— PISCES V Arrives Cork
— PISCES II Arrives Cork
— HECATE Relieves SIR TRISTRAM

VOYAGER Departs Cork with PISCES I! & III

— CURV Arrives Cork

— VOYAGER on Station

— PISCES I] Launched

— PISCES || Retrieved (Manipulator Failure)
— PISCES V Launched; Bottomed at 0615
— JOHN CABOT Departs with CURV

— PISCES III Sighted by PISCES V
— PISCES V Attaches Buoy Line

— CURV Arrives
— PISCES II Launched, Malfunction, Retrieved 2015

— PISCES V Retrieved

— Pinger Dropped on Buoy Line to PISCES III
— PISCES II Launched
— PISCES II Inserts Toggle in Aft Sphere

— PISCES II Retrieved

— CURV Launched

— CURV Inserts Toggle in Aft Sphere

— PISCES III Retrieval Begins

— PISCES III at 60-100 ft., Additional Lift Lines Attached
— PISCES III on Surface, Hatch Open, Rescue Complete.

710

Normal
Dive
(8 hr 3 min)

Mobilization/
Transportation
of Rescue
Assets

(39 hr)

Search/
Locate
(11 hr 44 min)

Attachment
of Retrieval
Devices

(22 hr 6 min)

1st Life Support Estimate

2nd Life Support Estimate

Life Support Remaining 3rd Life Support Estimate

~1 hr 43 min

P.V LINE

LIFT OFF BOTTOM

60 TO 100 FT

ADD 1ST SHACKLE PLUS BIGHT OF
4". BRAIDED NYLON AT MAIN LIFTING
POINT

AWASH

ADD 16 TON SNAPHOOK ON 25-TON
WIRE-ROPE COMBINATION THROUGH
SAME SHACKLE.

(CUT 4”. BRAIDED NYLON TO AVOID
SNAPHOOK TROUBLE ONCE WEIGHT
ON SNAPHOOK)

SKIDS CLEAR OF WATER
PERSONNEL RECOVERED.

Fig. 15.11 Diagram of lifting lines on P.III, attitude of P.IIl not shown correctly to simplify diagram. [From Ref. (6)]

711

10.

iN.

12. Melson, L. B. 1967 Contact 261. U.S.

. Kosonen, C., U.S. Naval Ship Engineer-

ing Center, Wash., D.C. (personal commu-
nication)

. Booda, L. L. 1973 Tragedy in the JOHN-

SON-SEA-LINK. Sea Technology, July 1973,
jth IE

. Redshaw, Sir Leonard 6 Sep 1973 Ac-

count of the PISCES IIT rescue. Vickers
Oceanic Ltd.

. Busby, R. F. 1973 Taxis to the Deep. in,

World Beneath the Sea. Nat. Geogr. Soc.,
p. 143-162. (revised edition)

. Andrews, F. A. 1966 Search operations

in the THRESHER area-1964, Section
II. Naval Engineering Journal, Nov., p.
769-779.

. Bline, D. 30 Oct 1973 Westinghouse

Ocean Research Laboratory, Annapolis,
Md. (personal communication)

Rainnie, W. O., Jr. 1971 Equipment and
instrumentation for the navigation of
submersibles. Underwater Jour., June, p.
120-128.

Merrifield, R. 1969 Undersea Studies
with the Deep Research Vehicle DEEP-
STAR-4000. U.S. Naval Oceanographic
Office, IR No. 69-15.

712

13.

14.

15.

16.

Wee

18.

IG).

20.

Zi.

Naval Institute Proceedings, v. 93, n. 6,
p. 26-29.

Rainnie, W. O., Jr. 1968 Adventures of
ALVIN. Ocean Industry, v. 3, n. 5, p. 22—
28.

Busby, R. F., Hunt, L. M., and Rainnie,
W. O. 1968 Hazards of the deep. Ocean
Industry, v. 3, nos. 7, 8, 9, p. 72-77, 32-39,
53-58 respectively.

Bradley, R. F. Arctic Marine Ltd., North
Vancouver, B. C. (personal communica-
tion).

Jebb, W. International Underwater Con-
tractors, Inc., City Island, New York.
(personal communication)

Kenney, J. E. 1972 Business of Diving.
Gulf Pub. Co., Houston, Texas, 302 pp.
Galerne, A. 1971 A diver looks back and
into the future. Offshore, Aug. 1971.
Sherwood, W. C. 1972 Operational evalu-
ation of a deep ocean search and recov-
ery ship. Preprints, 8th Annual Confer-
ence and Exhibition, Marine Technology
Society, Wash., D.C., 11-13 Sept. 1972, p.
521-547.

Ocean Science 1974 Nautilus Press,
Wash., D.C., v. 16, n. 6, (A weekly news-
letter)

The Washington Post, 15 Oct. 1974.

APPENDIX |
UNIT EQUIVALENTS

Exact relationships shown by asterisk(*). See footnote (2).

Area
UC ETGUIDS Th HS otic aces 654 Oo0.o0 Doom ane Sano plano cope o = 6.4516 square centimeters*
1) COMAROUEOS ne oc odo poo. coo poe B0u.on Sotomcdomcou mone S eee = 144 square inches*
= 0.09290304 square meter*
= 0.00002296 acre
1] SEWETE ETI co occqwsty sitios OL Ed odio co Oe Oboe bo mos cio = 9 square feet*
= 0.83612736 square meter
Mescliaren(stattiteirmilele. cscs rcccc ccs cases sre ersver si erateiceeroueleveneveuesey =.= = 27,878,400 square feet*
= 640 acres*
= 2.589988110336 square kilometers*
HESCHMIATEICEMLIMETEN, wtevele cere recat: cactena: ermncdeusiewere coerecucie eneustcs sab outs = 0.15500031 square inch
= 0.00107639 square foot
{) SSUERARHAET 6 depoee aus eo oun. o mo doo ulnima.con0 tom oe-o ooo min = 10.76391045 square feet
= 1.19599005 square yards
U serene Tiemaaese come omicincia paca cdo Ob ob oo bicioicio cect ears = 247.1053815 acres
= 0.38610216 square statute mile
= 0.29155335 square nautical mile
Astronomy
Rr ASOLAAUN Grace sists palate oyeleyere sleiele erat srsneve ewes atletelteterro elie) witiace to tee = 1.00273791 sidereal units
U SCEGECitsscéoccoconconmoodo pO ono anitooD DUD bOd0 dado Gu = 0.99726957 mean solar unit
MIMIC KOSECOMG Pecgancys etsy ele cicuerareictc mus cus se teietece ede tolens eSetamelionn, stem iervece = 0.000001 second*
ESE CONC rcasichete cries Ferichenaiaie creed ev etatave 2 faa s, oi beede save tehtens ee va abe veyetelieosae = 1,000,000 microseconds*

= 0.01666667 minute
= 0.00027778 hour
= 0.00001157 day
WBIYDITNUNLO Heb eete paves eu cvatteycteresans, vate one recorsters ots iase ser evereia ns tates cuciebe vedere = 60 seconds*
= 0.01666667 hour
= 0.00069444 day
U' INOUE eclend choto CROCE Ren CRC RT NEICRCHEREIS Ce aICIERETO ICRC CRORGTCR CH cncmn eset Coeiceer nes = 3,600 seconds*
= 60 minutes*
= 0.04166667 day
HEIMeEANISOLAam CAV ry tage secceitsteteterevere te ake soecate cuccetarone oy oetiovewenenstensnses = 24403™56555536 of mean sidereal time
= 1 rotation of earth with respect to sun (mean) *
= 1.00273791 rotations of earth with respect to vernal
equinox (mean)
= 1.0027378118868 rotations of earth with respect to
stars (mean)

U i@GAn SCG CE» vaso hoodoo oro oMpoDmUMcGn odor ones = 23956™04509054 of mean solar time
AeSicereal inom th iays syst avevenecevey keen cat ous car's; acs seep ayereve ve saysraustos caystersy ec sile = 27.321661 days
= 27907443™1155
1) Secor I rotor oootanacks cle cb oon peepee nein erotic = 29.530588 days
= 29412h44m9258
Astropicall (ordinary)! Year sss. e)s.ens, o.cnsacareeusyevs dies acs @psbee eves, acs suesrs = 31,556,925.975 seconds

= 525,948.766 minutes

= 8,765.8128 hours

= 365924219879—0900000006 14 (t—1900), where t
= the year (date)

= 36590548™46s

AESIGETCANY Cala texens iste chee Soa ei cies cis wrens orereusro sce ais Bee Deere mae ae = 365925636042+0.0000000011(t—1900), where t

= the year (date)

= 365906"09™0955

713

Astronomy—Continued
1 calendar year (common) ........0-2 eee e eee eect ete = 31,536,000 seconds*
= 525,600 minutes*

= 8,760 hours*
= 365 days*
Ancalendaryeat (leap) meneteerteleietelstet ators cist tetct terete et Nello ane csteuerts = 31,622,400 seconds*
= 527,040 minutes*
= 8,784 hours*
= 366 days*
Uitime” Gl ooo cdnvdnoscdbbouuocrDoosposoceaDooDSoDOGbOdUD = 9,460,000,000,000 kilometers
= 5,880,000,000,000 statute miles
= 5,110,000,000,000 nautical miles
= 63,300 astronomical units
31,000,000,000,000 kilometers
19,300,000,000,000 statute miles
= 16,700,000,000,000 nautical miles
= 206,265 astronomical units
3.26 light years
149,500,000 kilometers
= 92,900,000 statute miles
= 80,700,000 nautical miles
= mean distance, earth to sun

(IES spoodogocnguTo bo ncoUeN Oooo oc OD COON O Gm Od umcoO NO

W

epic outeallUinitoooaqanoasepuoccoDodcodpdmoounOosOOO ODM

Meanydistanceneanth toimoOOnbecraeiieacierreacterncieiclsicyeacloiciers cine isa = 384,411 kilometers
= 238,862 statute miles
= 207,565 nautical miles
Meantdistance: cant tovstiin reat suaeioieteie cate ensrsit oe) sone (el atepndeynurere = 149,500,000 kilometers
= 92,900,000 statute miles
= 80,700,000 nautical miles
= 1 astronomical unit
Sunisidiameter, cs-terercry so texnsous ore barks dente steteketekelte we cio! sles focs-Tecs delete 1,393,000 kilometers
= 866,000 statute miles
= 752,000 nautical miles
CUTEST Suse treed oho Ui0.0 O aesoldl er 60-9 010!.0.0,6,0 6 101-0, REE DERE eEe Hic = 1,987,000,000,000,000,000,000,000,000,000,000
grams
= 2,200,000,000,000,000,000,000,000,000 short tons
= 2,000,000,000,000,000,000,000,000,000 long tons
Speed of sun relative to neighboring stars ..... 1.2.0.0. e eee eee = 19.6 kilometers per second
= 12.2 statute miles per second
10.6 nautical miles per second
Orbitalispeediofeanthyacrsnve. iso demcrotore cert Roksus oneasvolerecetey srape ta ieseeseote = 29.8 kilometers per second
= 18.5 statute miles per second
16.1 nautical miles per second

iif

Obliquityror therechiptic: Larcmic wwleveteters cleusceene aiule eels tte ectie s Sunnceae = 23°27'08:'26 — 0:'4684 (t—1900), where t = the year
(date)

General precession of the equinoxes ...... 0... cee eee eee eee = 50!'2564 + 0:'000222 (t—1900) per year, where t =
the year (date)

Precession of the equinoxes in right ascension ............00e000- = 46:'0850 + 0!'000279 (t—1900) per year, where t =
the year (date )

Precession of the equinoxes in declination ............+.000000e = 20:'0468 — 0!'000085 (t—1900) per year, where t =
the year (date)

Magn tiidelratio c.cr nc cerca so prc ete tie eee ta encabannse sarees wake eeper are =2.512

=</100 *

Charts
Natiticalirmiles) perincn crete cesctereirarcaryeesa stern eaniean senor oeern tecuor ad ctts = reciprocal of natural scale + 72,913.39
Statuiteunitlesiperstrcly occ ciays: coke a abasic wo ctevauscnd sate cel nen, chvuesetc es flsye\ ais = reciprocal of natural scale + 63,360*
Inches per natiticallirmile tee: vcreccore itearteve: ere etotaoe epere aio) sstousisp creas = 72.913.39 X natural scale
Inches!perstatuteumlles <-:.,cccresedererars. speneseveneratene vosunteliodsntadacebeiseayererans = 63,360 X natural scale*
Natupaliscale: so.ccn i cchote a, storie ovic he er ener aero ree atera oteieretences = 1:72,913.39 X nautical miles per inch

i]

1:63,360 X statute miles per inch*

714

Earth

Acceleration due to gravity (standard)

Mean density
Velocity of escape
Curvature of surface

Clarke speroid of 1886
Equatorial radius (a)

Polar radius (b)

Mean radius 2 =b) SA SChASCLON eta LE OOD FERC ONLOS ALD BiLonc CALICO OREO CO

1' of equator
1’ of latitude at equator

1’ of latitude at pole

a—b
a

Flattening or ellipticity (f =

Eccentricity (e = \/2f- f2)

Eccentricity squared (e2)

Clarke spheroid of 1880
Equatorial radius (a)

Polar radius (b)

Mean radius (

715

= 980.665 centimeters per second per second

= 32.1740 feet per second per second

= 5,980,000,000,000,000,000,000,000,000 grams
= 6,600,000,000,000,000,000,000 short tons

= 5,900,000,000,000,000,000,000 Iong tons

= 5.517 grams per cubic centimeter

= 6.94 statute miles per second

= 0.8 foot per nautical mile

= 20,925,874.05 feet

= 6,975,291.35 yards

= 6,378,206.4 meters

= 3.963.234 statute miles
= 3,443.957 nautical miles
= 20,854,933.76 feet

= 6,951,644.59 yards

= 6,356,583.8 meters

= 3,949.798 statute miles
= 3,432.282 nautical miles
= 20,902,227.28 feet

= 6,967,409.09 yards

= 6,370,998.9 meters

= 3,958.755 statute miles
= 3,440.065 nautical miles
= 6,087.090 feet

= 2,029.030 yards
1,855.345 meters

1.153 statute miles
1.002 nautical miles

= 6,045.889 feet

= 2,015.296 yards

= 1,842.787 meters

= 1.145 statute miles

= 0.995 nautical mile

= 6,107.795 feet

= 2,035.932 yards

= 1,2861.656 meters

= 1.157 statute miles

= 1.005 nautical miles
ee |

294.98
= 0.00339007530
= 0.08227185422

= 0.00676865800

= 20,926,014.29 feet

= 6,975,338.10 yards

= 6,378,249.145 meters

= 3,963.260 statute miles
= 3,443.980 nautical miles
= 20,854,707.61 feet

= 6,951,569.20 yards

= 6,356,514.870 meters

= 3,949.755 statute miles
= 3,432,245 nautical miles

= 20,902,245.39 feet

= 6,967,415.13 yards

= 6,371,004.387 meters

= 3,958.759 statute miles
= 3,440.068 nautical miles

1‘ of equator

1’ of latitude at equator

1’ of latitude at pole

a
Flattening or ellipticity (r aa

Eccentricity (e =~/2f—f?)

Eccentricity squared (e)

International spheroid
Equatorial radius (a)

Polar radius (b)

Mean radius ee

1' of equator

1’ of latitude at equator

1’ of latitude at pole

“ Fase oar a—Bb
Flattening or ellipticity (f ar

Eccentricity (e = »/2f—f?)

Eccentricity squared (e 2)

Energy

1 joule

716

= 6,087.129 feet

= 2,029.043 yards

1,855.357 meters

1.153 statute miles

1.002 nautical miles

= 6,045.719 feet

2,015.240 yards

1,842.735 meters

1.145 statute miles

0.995 nautical mile

= 6,107.943 feet

= 2,035.981 yards

= 1,861.701 meters

= 1.157 statute miles
Heels nautical miles

~ 293.465
= 0.00340756138

= 0.08248339904
= 0.00680351112

= 20,926,469.85 feet

= 6,975,489.95 yards

= 6,378,388 meters

= 3,963.347 statute miles
= 3,444.055 nautical miles
= 20,854,707.61 feet

= 6,951,569.20 yards

= 6,356,514.870 meters

= 3,949.755 statute miles
= 3,432,245 nautical miles
= 20,902,983.35 feet

= 6,967,661.12 yards

= 6,371,229.315 meters

= 3,958.898 statute miles
= 3,440.190 nautical miles
= 6,087.264 feet
2,029.088 yards
1,855.398 meters

1.153 statute miles
1.002 nautical miles
6,046.342 feet

= 2,015.447 yards

= 1,842.925 meters

1.145 statute miles

= 0.995 nautical miles

= 6,107.828 feet

= 2,035.943 yards

= 1,861.666 meters

1.157 statute miles
1.005 nautical miles

W

= 0.00336 700337
= 0.08199188997
= 0.00672267002

= 0.10197 kilogram-meters

= 0.7376 foot-pounds

= 2.778 X 107 kilowatt hours

= 3.725 X 10-7 horsepower hours

1 kilogram-meter

1 foot-pound

1 kilowatt hour

1 horsepower hour

1 kilocalories

1 yard

1 cable (British)
1 statute mile

1 nautical mile

= 2.388 X 1074 kilocalories

= 9.478 X 10-4 B.T.U.

= 9.8067 joules

= 7.233 foot-pounds

= 2.724 X 10-© kilowatt hours

= 3.653 X 10-6 horsepower hours
= 2.342 X 1073 kilocalories

= 9.295 X 10.~3 B.T.U.

= 1.356 joules

= 0.1383 kilogram-meters

= 3.766 X 1077 kilowatt hours

= 5.051 X 1077 horsepower hours
= 3.238 X 1074 kilocalories

= 1.285 X 1073 B.T.U.

= 3.6 X 108 joules
= 3.671 X105 kilogram-meters

= 2.655 X 10® foot-pounds
= 1.341 horsepower hours
= 859.9 kilocalories

= 3,412 B.T.U.
= 2.685 X 10° joules

2.738 X 105 kilogram-meters
1.98 X 10° foot-pounds

= 0.7457 kilowatt hours

= 641.2 kilocalories

= 2,544 B.T.U.

= 4,187 joules

= 426.9 kilogram-meters

= 3,088 foot-pounds

= 1.163 X 1073 kilowatt hours
= 1.560 X 1073 horsepower hours
= 3.968 B.T.U.

= 1.055 joules

= 107.6 kilogram-meters

= 778.2 foot-pounds

= 2.931 X 1074 kilowatt hours
= 3.93 X 1074 horsepower hours
= 0.25200 kilocalories

= 25.4 millimeters*

= 2.54 centimeters*

= 12 inches*

= 1 British foot

1/3 yard*

= 0.3048 meter*

= 1/6 fathom*
=0.30480061 meter

= 36 inches*

= 3 feet*

= 0.9144 meter*

= 6 feet*

= 2 yards*

= 1.8288 meters*

= 720 feet*

= 240 yards*

= 219.4560 meters*

= 0.1 nautical mile

= 5,280 feet*

= 1,760 yards*
1,609.344 meters*
1.609344 kilometers*
= 0.86897624 nautical mile
= 6,076.11548556 feet
= 2,025.37182852 yards

iT}

= 1.852 meters*

= 1.852 kilometers*

= 1.150779448 statute miles
tag tel eee REECE ERO D Pc ro cctn a acht eset on can Cease Onions Bin Ine nn rte ae = 100 centimeters*

= 39.370079 inches

= 3.28083990 feet

= 1.09361330 yards

= 0.54680665 fathom

= 0.00062137 statute mile

= 0.00053996 nautical mile
i altel merscc-poc coc aw A ocka ceraro die flora c'6,cr0 rgieperORe ID BOE ORSIORENS ODO = 3,280.83990 feet

= 1,093.61330 yards

= 1,000 meters*
0.62137119 statute mile
= 0.53995680 nautical mile

Mass

‘I GTTES) cess aid. o6 0 Olly Golo caeticIc ot Oo O.Cir bra OlrmrO artes c Quo tho oc = 437.5 grains*

= 28.349523125 grams*

= 0.0625 pound*

= 0.028349523125 kilogram *
(ieee caoooocwanueacondo god ooeosoo ODO DODO U ONS mao DIND OC = 7,000 grains*

= 16 ounces*

= 0.45359237 kilogram”*
NAiDRHOh), suaccnacahoonoagacocooucnuocmooUmDOdodmrD 5. dn0D = 2,000 pounds*

= 907.18474 kilograms*

= 0.90718474 metric ton*

= 0.892857 14 long ton
Teen comsoonossbonpoodadoaPosEHeompocongednoEoSaDO OS = 2,240 pounds*

= 1,016.0469088 kilograms*

= 1.12 short tons*

= 1.0160469088 metric tons*
(qieeten sooscocacenoanhoapoeddnanchodenauocuoo Neo GDaGHe = 2.204622622 pounds

= 0.00110231 short ton

= 0.00098421 long ton
I GIReCh): scoocopmodrecudoovaueceudtnooaDoCDUDKOoUamoDSC = 2,204.6226218 pounds

= 1,000 kilograms*

= 1.10231131 short tons

= 0.98420653 long ton

Mathematics

Ron teres er RO ee ORR ERO OT CRO ERE OSOL.O OAL DC Olas Cn CORALS Osc G oct = 3.14159265358979323846 2643383 2795028841971
Fn HAT ERE Ca cheb pit to tin Oo CEN a er = 9.8696044011
OTe xiioe ania Gries Ce eat te ecu oar ene ert OE a = 1.7724538509
Base of Naperian logarithms (e) ..-...-. 000 eee eee eee ee eens = 2.718281828459
Modulus of common logarithms (logyoe) .---. 6. essere eee eee = 0.4342944819032518
UtaclEnh oneoacobouderoodoascouecoou tous CeUT odo gu aoe das = 206,264:'80625

= 3,437:7467707849
= 5722957795131
= 57°17'44:'80625

Ohcelh tel [tees eRe te toy OOS ono OIechitnd 6 cadet yt, O-OG,0'0-OOO'G- OO-chOO Ia. = 1,296,000''*

= 21,600'*

= 360°*

= 271 radians*
ISTO aa, ea Ener ACen LOO OE SA cai eso ron CRE CNR TROND 0 "0 = TI radians*
ee PERE RCE OAC O OI TCNOID CARS Di acRCIOL Cr EOE. .C: DADE Cooluene eo hea = 3600''*

= 60'*

= 0.0174532925 199432957666 radian
1 INR sae Ee re ete. REN OENGE: b. ex ORLA Cice OROIG, OOo CIee aC CO = 60"'*

= 0.0002908882086657 21596 radian
1 NE. esac SPCR TER SERRE ono SEO OM EOLONT o-eKC OORT RCE OG moet nT Citra O05 = 0.00000484813681 1095359933 radian
EF tG (1101 a REP OLS Bost cH ROIG IT SID Cano LOR Oa ce APN. O in DIO MONO ha = 0.0002908882045634 2460
CST a0 Ba AM Ie ses St bo, as SRR EO aa) ales eK in CMa CRE Ty Ott CNC CR CTCR CTO = 0.00000484813681107637

718

Meteorology
Atmosphere (dry air)
Nitrogen
Oxygen
Argon
Carbon dioxide
Neon
Helium
Krypton
Hydrogen
Xenon

Absolute zero

Pressure
1 dyne per square centimeter

1 gram per square centimeter

1 millibar

1 millimeter of mercury

1 centimeter of mercury
1 inch of mercury

1 centimeter of water

719

= 78.08%

20.95%

= 0.93%

= 0.03%

= 0.0018%

= 0.000524%

= 0.0001%

= 0.00005%

= 0.0000087%

= 0 to 0.000007% (increasing with altitude)

= .000000000000000006% (decreasing with
altitude)

= 1,013,250 dynes per square centimeter*

= 1,033.227 grams per square centimeter*

= 1,033.227 centimeters of water

= 1,013.250 millibars*

= 760 millimeters of mercury

= 76 centimeters of mercury

= 33.8985 feet of water

= 29.92126 inches of mercury

= 14.6960 pounds per square inch

= 1.033227 kilograms per square centimeter

1.013250 bars*

(—) 273215 C

= (—) 459967 F

99.99%

= 0.001 millibar*

= 0.000001 bar*

= 1 centimeter of water

= 0.980665 millibar*

= 0.07355592 centimeter of mercury

= 0.0289590 inch of mercury

= 0.0142233 pound per square inch

= 0.001 kilogram per square centimeter *
= 0.00096 7841 atmosphere

= 1,000 dynes per square centimeter *

= 1.01971621 grams per square centimeter
= 0.07500617 millimeter of mercury

= 0.03345526 foot of water

= 0.02952998 inch of mercury

= 0.01450377 pound per square inch

= 0.001 bar*

= 0.00098692 atmosphere

= 1.35951 grams per square centimeter

= 1.3332237 millibars

= 0.1 centimeter of mercury *

= 0.04460334 foot of water

= 0.39370079 inch of mercury

= 0.01933677 pound per square inch

= 0.001315790 atmosphere

= 10 millimeters of mercury *

= 34.53155 grams per square centimeter
= 33.86389 millibars

= 25.4 millimeters of mercury *

= 1.132925 feet of water

= 0.4911541 pound per square inch
0.03342106 atmosphere

1 gram per square centimeter

= 0.001 kilogram per square centimeter

AFOOT OF Waters ons, o:sseuacee cancel erasers teh cee av one saeco a sottove orcs eeeenepaneLanencens vee = 30.48000 grams per square centimeter
= 29.89067 millibars
= 2.241985 centimeters of mercury
= 0.882671 inch of mercury
= 0.4335275 pound per square inch
= 0.02949980 atmosphere
Li POUNG Pel SQUARE MC: weiter torenccetsnsesls bo taie tates oie crcherct seule cescaur sees = 68,947.57 dynes per square centimeter
= 70.30696 grams per square centimeter
= 70.30696 centimeters of water
= 68.94757 millibars
= 51.71493 millimeters of mercury
= 5.171493 centimeters of mercury
= 2.306659 feet of water
= 2.036021 inches of mercury
= 0.07030696 kilogram per square centimeter
= 0.06894757 bar
= 0.06804596 atmosphere
(ek logramipensquarelcentimetenmennieienieirinieee ieee = 1,000 grams per square centimeter *
1,000 centimeters of water

All beareerere dees cur oc, crc toe Re eter tee ene ree tele se laecneste col anausradrenate = 1,000,000 dynes per square centimeter ™*
= 1,000 millibars*
Speed
lifootiperniminutes coe ome somes sce Sere ans Ge oes aieaieres = 0.01666667 foot per second
= 0.00508 meter per second*
AkyarGiperamminuter ars sGicsere ee: nakce tee ners eee ile ore fon cua saenauseatet scones = 3 feet per minute*

= 0.05 foot per second*

= 0.03409091 statute mile per hour

= 0.02962419 knot

= 0.01524 meter per second*
AnfootpenisecONnGMman mre cei ereeyiec us crcyerstee cialis kat snegetciens = 60 feet per minute*

= 20 yards per minute*

= 1.09728 kilometers per hour*

= 0.68181818 statute mile per hour

= 0.59248380 knot

= 0.3048 meter per second*
Akstatuteimilepen NOUN « cser., stuns ayencterauecocnsteuel se coiverale) ecauesreteerenar = 88 feet per minute*

= 29.33333333 yards per minute

= 1.609344 kilometers per hour*

= 1.46666667 feet per seond

= 0.868976 24 knot

= 0.44704 meter per second*
icktuodmae ence mon taro DMO oe deo oo mo como aman ddccorae 6 = 101.26859143 feet per minute
33.75619714 yards per minute
= 1.852 kilometers per hour*
= 1.85447652 feet per second
= 1.15077945 statute miles per hour
= 0.51444444 meter per second

A KilometeniperchOUG ac isvercie stators ersten cosre orton creronous lalavenaie ets cuenenes = 0.62137119 statute mile per hour
= 0.53995680 knot
TRMELEN PE: SECON use tre a siete crete Ataris ste TO RT There cme a APS = 196.85039340 feet per minute

= 65.6167978 yards per minute
= 3.6 kilometers per hour*
= 3.28083990 feet per second
= 2.23693632 statute miles per hour
1.94384449 knots
LIGETI WACUO™ oars cs vue cotcucho: sehen scl her ena eleascenc lore ie tavouanaver a eioiomreecirtameters 299,792 kilometers per second
186,282 statute miles per second
161,875 nautical miles per second
983.570 feet per microsecond
EIQICUT Aiiigude: sieves ance ettremerer ene ae tte ere ere ea oe al ro coer = 299,708 kilometers per second

= 186,230 statute miles per second

il}

720

= 161,829 nautical miles per second

= 983.294 feet per microsecond
Sound in dry air at 60° F and standard sea level pressure .......... = 1,116.99 feet per second

= 761.59 statute miles per hour

= 661.80 knots

= 340.46 meters per second
Sound in 3.485 percent salt water at60° F .........---. 00s eeeee = 4,945.37 feet per second

= 3,371.85 statute miles per hour

= 2,930.05 knots

= 1,507.35 meters per second

Volume
ARCUbICHINChiEAmerercrt ii eicrricier er tolek torneo = 16.387064 cubic centimeters*
= 0.01638661 liter
0.00432900 gallon
ARCUDICILOO Ler ieriet tenant tere detector tenia ledotovoteviereteveenaiarastaKeleltartawe 1,728 cubic inches*
28.31605503 liters
= 7.48051946 U.S. gallons
= 6.22883522 imperial (British) gallons
= 0.028316846592 cubic meter*
1) GuUse WAR] sdcocodaseocadcasdouscooddboucocpaMboevouEdE = 46,656 cubic inches*
= 764.53367616 liters
= 201.974010624 U.S. gallons
= 168.17859283 imperial (British) gallons
= 27 cubic feet*
= 0.764554857984 cubic meter*
ECUDICICENTIMELC lar ete ieiciiercionskelisifctenapekensneicien iene lereisnenietekel cloner = 0.06102374 cubic inch
= 0.00026417 U.S. gallon
= 0.00021997 imperial (British) gallon
AN CUEICAIMIETONS resco terete oiccs cotane atric’ ereben et aliducilance, ec3i(e enenieueraxepeveuststeierere cata = 264.17203187 U.S. gallons
= 219.96923879 imperial (British) gallons
= 35.31466655 cubic feet
= 1.30795059 cubic yards
1 quart RUG op erties atecersuewere revere cretece i’ specets faveristavets cavictatevaramerevaraneiersiavers = 57.75 cubic inches*
= 32 fluid ounces*
= 2 pints*
= 0.94632645 liter
= 0.25 gallon*
Uceion (US) cossttoucosoescecoogacnnooTe ood omonodoeae = 3,785.3984784 cubic centimeters*
= 231 cubic inches*
= 0.13368056 cubic foot
= 4 quarts*
= 3.7853058 liters
= 0.83267412 imperial (British) gallon
ARN GeM: wo, vercccrsteenc o. tieWet ever at cvevel sfe}ere aia elein archavevelave Siepsiekeryeleiniensfewsys = 1,000.028 cubic centimeters
= 61.02545 cubic inches
= 1.05671780 quarts
= 0.26417945 gallon

i (CISGPiCW “adenpospedouoomoed Comoamc con coor.or mom coscaec = 100 cubic feet*

= 2.8316846592 cubic meters*
MMeASUTeMmentatOnmrtetsra.cRercvchetene stetckoie cereus eretaneliehonereiei(ou ote) oertov ears = 40 cubic feet*

= 1 freight ton*
Ui WETICE. cdootanddencapowoonenucoUucoUnoasOdgDOnDOdING = 40 cubic feet*

= 1 measurement ton*

721

Volume-mass

Arcubic FOOE Of SCAIWALe Le mia ese eteiclay ofieleke a erer erected =
1 cubic foot of fresh water ..........2.seeeeas

UCM VOiCOMCNIAA Ganersoanoonocnoodvo UGS adeO
fidisplacementstonunensdeiscie eateries eden tnen yi

eta gave ayers Atewe Oot = 64 pounds
ea penetagsestakersadees = 62.428 pounds at temperature of maximum

density (4° C = 39°2 F)

RRRiG Mae oarenaaalete = 56 pounds
mietedeteycuctarcusts cove = 35 cubic feet of sea water*

= 1 long ton

(1) Taken in part from Bowditch (H.O. Pub. and the U.S. Navy Diving Manual, NAVSHIPS 0994-001-9010)
(2) All values in this appendix are based on the following relationships:

1 inch = 2.54 centimeters*
1 yard = 0.9144 meter *

1 pound (avoirdupois) = 0.45359237 kilogram *

1 nautical mile = 1852 meters*

Absolute zero = (—)273°15 C = (—)459°67 F.

Symbols and Notes

A Area

Cc Circumference

D Depth of water

H Height

L Length

N Number of divers

R Radius

VW Tons

Vv Volume

Dia. Diameter

Dia.? Diameter squared

Dia.3 Diameter cubed

T (pi) 3.1416

1/47 .7854

1/67 -5236

PP: Partial Pressure

psi Pressure per square inch
psig Gage Pressure

psia Absolute pressure
F.P.M. Feet per minute

B.S. Breaking strain of line or rope
S.W. Safe working load of line or rope

Formula for Areas
The area of a square or rectangle —
A=LXW
The area of a circle —
A = .7854 X Dia.? or A= 7 R2

COMMONLY USED FORMULAS

Lifting Capacity (in Pounds)
Fresh water (V X 62.4) = Weight of lifting unit
Salt water (V X 64) = Weight of lifting unit

Miscellaneous Formulas
Partial Pressure of a gas (in psi) —
P.P. = [((D + 33) X .455] X % of gas

|=

P.P.= X % of gas, in ata.

33
P.P.=[D +33] X % of gas, in fsw.

Time between stops in seconds —

T= (Dieft — Darrivea) X 60
F.P.M.

Emergency Hose Test [(D X .445) + 50] X 2
(Hold pressure for 10 minutes)

722

Formulas for Volumes
The volume of a cube (compartment) —
V=LXW=H
The volume of a sphere (balloon) —
V = .5236 X Dia.3
The volume of a cylinder (pontoon) —
V = .7854 X Dia.2 XL

Temperature Conversions

1. Fahrenheit to Centigrade
°C = 5/9 (°F — 32)

2. Centigrade to Fahrenheit
°F = 9/5 (°C) + 32)

723

Formulas for Seamanship
1. Breaking strain of natural fiber line =
C? X 900 Ibs.
2. Breaking strain of nylon wire = C? X 2,400 Ibs.
3. Breaking strain of wire = C* X 8,000 Ibs.
Safe working load for 1-2-3 above —
1/4 B.S. = S.W. for new line or wire
1/6 B.S. = S.W. for average line or wire
1/8 B.S. = S.W. for unfavorable conditions
Safe working load of a shackle =
3 X Dia.? = S.W. in tons
Safe working load of a hook =
2/3 X Dia.? = S.W. in tons

APPENDIX II

93n CONGRESS
Isr SEssION H. R 89 24
e

IN THE HOUSE OF REPRESENTATIVES
JUNE 22,1973
Mr. Downrne (for himself, Mrs. Suttivan, Mr. Mosner, Mr. Rocers, and Mr.

Mureuy of New York) introduced the following bill; which was referred
to the Committee on Merchant Marine and Fisheries

A BILL

To promote safety in the operation of submersible vessels.
il Be it enacted by the Senate and House of Representa-

2 tives of the United States of America in Congress assembled,

3 That this Act may be cited as the “Submersible Vessel
4 Safety Act”.

° Src. 2. As used in this Act—

6 (1) “Secretary” means the Secretary of the de-
u partment in which the Coast Guard is operating, and
8 (2) “submersible vessel” includes any contrivance
9 used or designed for transportation underwater, for
10 human occupancy underwater, or for underwater com-
11 mercial purposes, other than those of the Government

I

724

2
of the United States used or designed as instruments
of war.

Src. 3. (a) To promote safety in the operation of sub-

mersible vessels, the Secretary may prescribe regulations—

(1) for the design, materials, workmanship, con-
struction, outfitting, performance, maintenance, and
alteration of submersible vessels;

(2) for the design, materials, workmanship, con-
struction, performance, maintenance, and alteration of
equipment incidental to the operation of submersible
vessels;

(3) for tests and examinations with respect to
paragraphs (1) and (2) of this subsection including
provisions for their performance by qualified private
persons whose tests, examinations, and reports are ac-
ceptable to the Secretary ;

(4) for the manning of submersible vessels, includ-
ing the duties and qualifications of operating personnel ;
and

(5) for such other practices and procedures as the
Secretary finds necessary to provide adequately for
safety.

(b) When the Secretary finds it in the public interest

he may grant exemptions from the requirements of any

regulation prescribed under this section.

725

3

(c) Submersibles certified by the American Bureau of
Shipping or other classification society approved by the Sec-
retary may be accepted as having met sections 3(a) (1)
and (2).

(d) The Secretary may by regulation exempt manned
submersible vessels from the requirements of this Act and
any regulation issued thereunder if he determines that the
manned submersible vessel is being constructed or operated
for developmental, experimental or research work.

Src. 4. (a) The Secretary may group submersible
vessels into classes on the basis of similarity of characteristics
or of utilization, or both.

(b) The owner or the builder of a submersible vessel
subject to any regulation issued under section 3 of this Act
shall apply to the Secretary for a certificate of inspection.
If the Secretary finds, after inspection, that the submersible
vessel is properly equipped and safe to be operated in accord-
ance with the requirements of this Act and the regulations
hereunder, he shall issue a certificate of inspection. The Sec-
retary may prescribe in a certificate of inspection the dura-
tion thereof and such other terms, conditions, and limita-
tions as are required in the interest of safety.

(c) The Secretary may, from time to time as he deems
necessary, reinspect any submersible vessel for which a

certificate of inspection has been issued. If the Secretary

726

4

=

determines as a result of a reinspection that such submersible

~

2 vessel is in violation of this Act or any regulation issued

(Je)

under this Act, and that it is in the interest of safety, he

4 may amend, suspend, or revoke a certificate of inspection.

5 Src. 5. (a) The Secretary may issue submersible vessel
6 operators licenses in accordance with regulations prescribed

7 by him, to applicants found qualified as to age, character,
8 habits of life, experience, professional qualifications, and
9 physical and mental fitness.

10 (b) The Secretary may prescribe with respect to any

11 license issued such terms, conditions, limitations as to dura-
12 tion thereof, periodic or special examinations, tests of physical
13 fitness, and other matters as he determines necessary to as-
14 sure safety in the operation of submersible vessels.

15 (c) The Secretary may suspend or revoke a license

16 issued under this section if the holder—

7 (1) has violated any law or regulation intended to
18 promote marine safety or protect navigable waters,

19 (2) is physically, mentally, or professionally incom-
20 petent, or

21 (3) has committed an act of misconduct or negli-
22 gence while operating such a vessel.

23 (d) No person shall operate any submersible vessel with-

24 out an operator’s license if by regulations established under

25 this section he is required to have a valid submersible vessel

727

5
operator’s license for such operation. Whoever violates this
subsection shall be liable to a civil penalty of $1,000 to
be assessed by the Secretary. The Secretary may remit or
mitigate upon such terms as he deems proper any penalty
assessed under this section.

Src. 6. (a) The Secretary may examine, evaluate, and
rate civilian schools giving instruction in the operation of
submersible vessels. When the Secretary is satisfied as to
the adequacy of a school’s course of instruction, the suit-
ability and seaworthiness of its equipment, and the com-
petency of its instructors, he may issue a certificate for the
school.

(b) If the Secretary finds as a result of a reexamination
or reevaluation that it is in the interest of safety, he may
modify, suspend, or revoke a school’s certificate.

Src. 7. (a) The Secretary may appoint, without regard
to the provisions of title 5, United States Code, governing
appointments in the competitive service, advisory commit-
tees for the purpose of consultation with and advice in the
performance of functions under this Act.

(b) Members of such committees, other than those reg-
ularly employed by the Federal Government, while attend-
ing committee meetings or otherwise in the performance of
their duties under this Act, may be paid compensation at

rates not exceeding $100 per day and, while serving away

728

bo

6
from their homes or regular places of business, may be al-
lowed travel expenses, including per diem in lieu of sub-
sistence, as authorized by section 5703 of title 5, United
States Code, for persons employed intermittently in the
Government service.

Src. 8. (a) The owner and the person in charge of a
submersible vessel found in violation of this Act or the regu-
lations issued under this Act, are each liable to a civil penalty
of $1,000 for each such violation to be assessed by the
Secretary.

(b) A submersible vessel found in violation of this Act
or the regulations issued under this Act is liable to a civil
penalty of $1,000 to be assessed by the Secretary for which
the vessel may be libeled and proceeded against in any dis-
trict court of the United States having jurisdiction.

(c) The Secretary may remit or mitigate upon such
terms as he deems proper any penalty assessed under this
section.

Sec. 9. Nothing in this Act shall be construed to impair
or affect any authority of the Atomic Energy Commission
under the Atomic Energy Act of 1954, as amended.

Sec. 10. The Secretary shall, upon the request of the
Secretary of Defense, exempt from the requirements of this
Act or any regulation issued under this Act such submersible

vessels as may be requested by the Secretary of Defense.

729

m (7)
8 FA
= =
WNAHAPWN> B OOPWON> wD

se 112,
— kh

——— 4:

APPENDIX III

SEA OTTER
Pre Dive Check List

(To be completed for the first dive of the day)

All discrepancies cleared and/or noted from previous dive.

Compensation system filled, minimum 2000’ PSI.
Air ballast system filled, minimum 2000’ PSI.

O2 — 3 full bottles plus 4th in use (40 man hours per bottle).
LIOH — 2 full cannisters plus 3rd in use (64 man hours per bottle).

Weight and ballast completed.

Equipment on brow secure, penetrators and compensating lines secure.

Ballast weight secure.

Drop weight secure.

Thrusters clear.

Main propulsion clear.

No obvious structural damage.

Air systems filling valves capped.
Antenna and transducers clear.

Flag secured to antenna.

Marker buoy secure and spool line secure.

Hatch ‘‘O”’ ring cleared, and inspected and greased.

Magnetic compass.
Compensating valve open.
Lifting bridle.

Cabin Checks

——— Ie

NOTARY

Valves set for dives

dump valves closed.

Drop weight free and
handle aboard.

Surface radio.

V/W phone and pinger.
Thrusters.

Main propulsion.
External lights, dome and
Panel lights.

— 8. Sonar — spare parts.
—_— 9. Video — spare tapes.

——_10. Tape Recorder — spare tapes.

———11. Scrubber — both models.
e125 (Gyro:

———13. Manipulator.

——_—14. Camera and strobe.
———15. All mechanical penetrators.

730

Dive

Date

Emergency Equipment Misc. Equipment

ee Mights|(2) ——— _ 1. 35 mm camera, spare film
—— 2. Water and food ———_ 2. Dive logs and pens
—— 3. Inflatable life preservers (3) —_. 3. Customer equipment
—_ 4. Face masks (3) —_. 4. _ Proper clothing for all aboard
____ 5. Xenon flasher and mirror —— 5. All surface support equipment
—__ 6. _ Relief bottle checked and operational
—_._ 7. Tool kit, fuses —___ 6.._If 3 men aboard add 1 O2 bottle
—__. 8. _ Emergency breathing and 1 LiOH cannister.
—— . 9. O2 and CO2 gas sensing devices
—_—10. Compensating system emergency Signed

filler hose Crew Chief

—11. O2 wrenches (2)
—— 12. Spare Scrubber motor Signed
Pilot
SEA OTTER
Post Dive Check Sheet

Mech

Variable ballast drained and flushed.

Compensation system checked for water.

Check motor drain plug.

Sub hosed down.
Electrical

Spare fuses checked and replenished.

Aux. batteries checked and replaced as necessary.

Time commenced battery charge.

Gyro caged.
Life Support

Emergency equipment inspected and completed.
Interior cleaned and relief bottles removed.

Hatch sprayed, ‘'O” ring cleaned and stored.

Hatch cover installed.

De-humidifier/heater installed and operating.

Empty O2 cylinders removed and replaced.

Depleted CO2 absorb cannisters removed and replaced.

731

APPENDIX III (Cont.)

SEA OTTER
Weight and Balance

Sea water Dive
Fresh water Date
(circle one)
ile Crew Weights
Ae
2:
3h,
Total
De Additional Equipment
1.
2
3:
4.
Total
3. Equipment Removed
us
2.
oe
Total

4. SEA OTTER payload

3} Total of (1) and (2) minus (3)

6. Subtract 5 from 4
7. Amount weight added if positive Added
Removed if negative Ase Removed
(circle one)
SEA OTTER 160 #s heavier in fresh water hh a

Pilot

732

deg
deg/sec
DOT

ACRONYMS and TERMS

Angstrom unit

American Bureau of Shipping

Alternating current

Air conditioning

Auxiliary General Survey

American Institute of Aeronautics & Astrinautics
Aluminum Co. of America

Amplitude modulation

ampere(s)

ampere-hour(s)

American Society of Mechanical Engineers
Auxiliary Submarine Rescue

American Society of Testing & Materials
Atmosphere(s)

Atmosphere(s)

Atlantic Undersea Test & Evaluation Center
Admiralty Underwater Weapons Establishment
American Wire Gage

Center of buoyancy

Buoyancy Actuated Launch & Retrieval Elevator
Submerged metacentric height

Base line

British thermal unit

Civilian band

Closed Circuit Television

Drag coefficient

Centre D’Etudes Marine Avancees

Cubic feet per minute

Center of gravity

Lift coefficient

Centre National pour l’Exploitation des Oceans
Chief of Naval Material

Chief of Naval Operations

Capagnes Oceanographique Francais
Compagnie Maritime d’Expertises

candle power

Cycles per hour

Cycles per minute

Cathode Ray Tube

Continuous Transmission Frequency Modulated
Controlled Underwater Research Vehicle
Continuous wave

Displacement volume

Direct current

Deck decompression chamber
Deep Dive System

degree

degrees per second
Department of Transportation

733

ICAD

Deep Ocean Technology

Deep Ocean Work Boat

Dead reckoning

Deep scattering layer

Deep Submergence Research Vehicle

Deep Submergence Research Vehicle Tender
Deep Submergence Systems Project

Deep Submergence Systems Review Group
Deep Submergence Search Vehicle
Decompression Staging System

Effective horsepower
Entrance lock
Electromagnetic
Electromagnetic interference
Electro Oceanics

Fore/akt

French-American Mid-ocean Study
footcandle

Frequency modulation

Fonds National de la Recherche Scientifique
Forward perpendicular

Feet per minute

foot, feet

feet per second

Center of gravity

General Electric Company

Gigahertz

Glass reinforced plastic

Gallons per minute

Glass reinforced plastic

Groupe d’Etudes et de Recherches Sous-Marine

Human Element Range Extender
High frequency

Hood Inflation System
Horsepower

Hour(s)

International Hydrodynamics Ltd.

Integrated Control & Display

Combittee on Marine Research, Education & Facilities
Inside diameter

Institut Francais du Petrole

Inch, inches

Kilohertz

Kollsman Instrument Corporation
Kilopounds per square inch
kilowatt(s)

Kilowatt-hour(s)

Launch & Recovery Platform
Pound(s)
Longitudinal center of buoyancy

734

MATLAB

Mhos/m
mHz
MILSPECS
MSO

NAVOCEANO
NAVSEC
NAVSHIPS

OFRS

Longitudinal center of gravity

Local Civil Time

Low frequency

Low light level TV camera

Lockheed Missiles & Space Company
natural log per meter

Lock-out

Length overall

Liters per minute

Launch, Recovery & Transport Vehicle

Metacenter

Mutual Assistance Rescue & Salvage Plan
U.S. Navy Materials Laboratory

Main ballast tank

Medium frequency

Milliohms per meter

Megahertz

Military Specifications

Minesweeper, Ocean

Marine Technology Society

Manned Undersea Activities

Manned Undersea Science & Technology
Motor Vessel

Not available

National Aeronautics & Space Administration
Navy Material Command

Naval Oceanographic Office

Secretary of the Navy

Naval Ship Systems Command

Naval Civil Engineering Laboratory

Navy Electronics Laboratory

National Oceanic & Atmospheric Administration
National Oceanographic Data Center

No provisions (aboard)

Naval Research Laboratory

Naval Ship Research & Development Center
Naval Ship Research & Development Laboratory
Normal Temperature & Pressure

Naval Undersea Center

Naval Undersea Research & Development Center

Oxygen Breathing Apparatus

Outside diameter

Office Francais de Recherches Sous-Marine
Chief of Naval Operations Instruction
Ocean Research Equipment, Inc.

On-scene commander

Pulse

Pounds per cubic foot
Primary cable termination
Phase comparison
Working manipulator

735

BET
ppm
ppt
P/S
psf
psi
psia
psig
PTC
PVC

SUBDEV-
GRU-1
SUPSAL

ANU
TPS
TV

UCLA
UHF
UQC
USCG
USN
USNUSL
V
VAC
VBT
VCB
VCG
VDC

Pilot presentation indicator
Parts per million

Parts per thousand
Port/Starboard

Pounds per square foot

Pounds per square inch

Pounds per square inch absolute
Pounds per square inch gage
Personnel Transfer Capsule
Polyvinyl chloride

Research & Development
Rescue Control Center
Request for proposals
Relative humidity

Root mean square
Revolutions per minute
Respiratory Quotient
Research Vessel

Search & Rescue

System Classification Authority
Standard cubic foot

Standard cubic foot per hour
Standard cubic foot per minute

Shaft horsepower

Silicon Intensifier Target

Society of Naval Architects & Marine Engineers
Ship of Opportunity

Strength, power, communication cable
Submarine Rescue Chamber

Single side band

Submarine Test & Research Vehicle
Standard Temperature & Pressure

Submarine Development Group One
Supervisor of Salvage

Transponder Interrogation System
Tandem Propulsion System
Television

University of California-Los Angeles
Ultra high frequency

Underwater telephone

U.S. Coast Guard

U.S. Navy

U.S. Navy Underwater Sound Laboratory

Volt(s)

Volts alternating current
Variable ballast tank
Verticle center of buoyancy
Vertical center of gravity
Volts direct current

736

Very high frequency
Very low frequency

Weight

Water sensor pod

Western Marine Electronics
Watt-hour(s)

Woods Hole Oceanographic Institution
World War II

737

CORPORATE INDEX

Page
AG Gab lectronics: Dives General Motors) Corpse eee ee 128, 546
A CCESSICO itd. © (teen caret Se od Be ee 189
Acrojet-Generale Gop sska sa eee Se ee a ee ee eee 337
AltOceansindustries sinew een en Bees ee ee ee eee 87
Allis-Ghalmers; ieeeve de Ma Cie es ceo eee nee I sO ee oe ee 331
Alpine? Geophysical’Associates) "2s 2222s tees. A es 2 A ee ee eee 502
/Nkovaanbaneyaey Cloyony aeons it ANGKOR, ee 89, 705
AmMenicanrsubmaniner Cons) =e. ee ee ee eee eee 48, 213
NAP Ce see ay a 2 Ng ee a Ee eT Se 606
ATAU TICS Li) Cae eee eee ye eee mee eens Se a ee On ee 5, 55, 169
PNR ETA GV Eha] LGW en, eh ee a pal SN eee er Se es ee =e ee 5, 64, 169, 195
AttlanticvkvesearchuConp ims s— 2 see oe ea ON ee ee eee 501
Bacharachelnstnuiment; COLD aie se aaa = Soe ee ee ee ee 435
BalleBrotherspResearcht Cos=. -- --=— "=... ee ee ee 480
Beckmanvlnstruments anes) === ne ee ek ee ee 544
IBenthose Corp sept eereen a aie eg eS Od ee eee ee 514, 550
Bioy Mannesindustiies te sees. ete Ne SS eee eee 434
BirnsrGr sa wy ciwln cam 2. ete: Sey aes eo UN eh ee ee oe ee eee 478
BissetabermaniGonp meso oe eke ee a a ee 544
BOW NEATICHE: OO tHe ean 2 ett MP PP OMS Vo rs ee Be a eee 5, 230
Bruker rnysilkeA Gree ee inne eS a SE gets hh eee eh ee 66, 153, 155
CED ELOO]S eae a eee Saae rs Oa ee ee 2 eee ee oe 225
CangDivewli td seamen nner 4. PRR oo RS eS cat ee ee ee ee 5, 64, 169, 195
(Chnroeyeraves) Creer nayerrEOlMGRWVS JENNER 2a = 208, 210
CharleseVeny;Submaninesmesee mo. ts. ea oe oe el 87
CobupblectronicsiConrpn eas 22s Be cee Pel Ss SS ee ee ee 480
(OM XGgoe a eS ce eed Aare a ISS cg, oe os oat Pe ee Oe) Se 82, 703
GontrolexiCorprotwAmenicagere=-—-. 0 a Be el ee ee ee 399
GrousesHinds? Corp seat = eae 5 eevee RO Per Bg le. Ses 2 ef 350
DAGTO TB rien Coes ees aie See 8 EA ase ee Sa a ls Se ee 346
Deeprseawlechniqueswese ae a= =a oe i LN Oe a eae 84
DeepaWaterh xplokationelitds | Ws2222e a 2 ee ae ee 217
DEBrConstructionwlitd wae oe Bart. ee eee el ee 0 141
DillinghamiConp:sse< sate ee a Pe ee ee ee. Oe ee ee ee ee 475
Dutchi submarines Senvicese == .- = — san a ee ee ee eee 65
HastmaniKodalkuGon @ ieee mee toe sr eee a Ts OL ee 550
EdoswWesterns Cornice sco seein ee oe SE cen ee oe ee 480
BGS Gulntemationall Sees seo setae ee Bele ee ty Ve SE ieee 548
MlectrovOceaniCss Corps mee oe eae oe Te ase es eo ee oe ee 341, 346, 350
BeaWarbDwiver\ Cos: timers cna iy Eee ee ae, So 434
Branklin Wlectrici@o:; 22st Sa6 0a 2 as ee ee ee 389
Garrison? S'Divers' Corps = 22-22 Se ee eee 107
GeneraleAp plied’ Serence Tia orto rye ete a aetna I 509
Generale ymamicse Corp eee eee 43, 88, 99, 193, 215, 217, 219, 331, 341, 370
GeneraltilectricaGos .. 20" 2) Wa eee ge er Set eek De eee he ee 399
General Malls: Corpse = 25 ssc an FS Nea st are ee 44, 91
Generali MotorsuConpwss 22282 ee Be A ea ey 2 ee 56
General’Oceanographics, ines. =e oo ee ee fe ee 55, 161, 395
General!'Oceans line: pe ee ee Oe ee ee eee 574
General Mime Gop yo a2 ame eee ea re a ae a ere 501

Germernall Witalem Corpo, cs a a ae ree fe ee ee eee eee te 480
GiOwAMG@ a ISROUIOS: 1 a ee ee ee eee ee 57, 101
GreavlakessUmdenwatern so pontsedlinGs (es seen ee ee ee 157
(Crowuraraaena ANriexeree te HB Ta year aeyeN eave COT 0 57, 105
IRlalaon ke Olleny? © Se Se ee ee ee ee eee 254
Inl@alke lainyspiareiniyen, WAGs" (psa 2 es SR ng EE | REN Se ee ee eR eee 43, 221, 518
Floren Marinas lap golorenpione, Wygcl oe se ee ee 64, 101, 105
Faby do- Catv lavorgs Oly ieee imemernins mate mule Poe ke try eee ou eek el ee eS 324
Ey dromnOd Cis mane ni mat eer aed Ba Sec a ee ee ees Se eed 480, 547, 548
eliien | if > nnn, Se ee es tent nn Ee ee oe ee tee) 478
TaUROATMAINESS Wiees, et ee Se ee ee ee Se a ae tee ee Be ee ee 10
InternationaliGasc Detector pl tia ssa. see ee SEE Terai 2) oe Sr re 434
Imbermationalechydrodymamilesy lotde esse se sa eee oe 52, 70, 93, 97, 188, 185, 187, 191, 345, 550
ImternationalsUnderwater Contractors) Imes ese s. ee 62, 103, 173, 400, 703
biG anmone ectr Capewea ese a eae Oe Se ee Se 2 ed ee ee 346
AapaANesewoLec karate CO: pete ae eee = = Be BE os de ee ere ae 149
done Wits Gog en A oe ee ee ee eee eee ee 346
Kawasaki leaysvalnGustiries ws tdigeee a2 meee oe ee ee eo ee 66, 137, 203
INerasinaya, VLARols #2 oss SE mee ee ca Es ee eels ee ae ee eee eee eee ee fe ial
i xpaiceneaanyiey Chie Oy: 9) Ns eo ee res eS Ss Og ee se ee eee 435
Gy velUitel CSeml itn Comet eter Mice ee cee IR et we ee ae ee Entei eee ee 225
Ketired SCR CUSUTICS sates eee ee Lie ee i ee ee eS ee ee ee ee eee 438
KiotenesOceank evelopment Cor yg eee ee ee ee os Se a 66, 231
ILaxConte sy lotrel svete SUP 5 se eee Te Ses ee ee ee ee ee ee ne ee ee 553
iL@pir Sicrellere late) t= Se RN SI eee et See ea ae ee oe ee ee oe 44, 107
ECO ctsEnaciMeelin gauss eens ee eee a oe ee eee 227
Mockheed@MissilesyaspacelCogpes sass 2 2 sce ee ee ee 21, 113, 354
Maman ges ln Cae Sean = ae ees aes 5 pay ae ee a Ee Pa eS ee ee oe 594
lilac Ivleraine Cop. 25-22 2 en 2 eee oe Oe i ee ee eee 2 ee ee 346
Mier binerse vin ogee ll Seelin cement ee pee hy ee a 40, 221, 456
MaschinenbausGall ers Gimibp ls == seen ss eet ees Cen en ee ee ee ee eee 66, 231
Migsubishistleavvalindustriess: 2-20.22 22808 tn oo ees ee ee 239, 275
INEGI et CCsm i) Cam mene ee sone De wer de ee ae 159
Niger, Uioey Ss a af NS ae ar ee ne eae ee ee ee ee eee ee Se 161
INGIRENG] TRY cae ae ae SS vo ee ce eine OU ee ae ee ere ee ae 65, 165
INontoeAmenicanehockwelle Corp ew aeaet 2a 8 sry cla 2 ee ee 56, 103
Nigeria, OMiesavdiws, Io, “es a ee ee eee 179
Qecam Seeley »Sc.ss See ee ee ee eg ge ee 705
Queenan SivSiernssd ines Sse ES a en ee ee ee ee 56
OceaneSy Stem st apaneel; tC suum cesremnee ween rete Meer ee ee oe ee 66,137
OfticesHrancaisidesRecherches|Sous= Marine sam seen ee ee 48, 51, 60, 208
Otesain IResermneln 1B umhaneacevane,, ime COURT ae 550
TEGO) SRO ~My ee A ee eee eee ae a ee 187
Acca ian COoBDivemWhibaker COnD. 2) a2 2 ee es De ee 487
IPnehinie Sloman. Caps Se ee ee ee ee ee ee eee 84

Lema auvorin Wiloytore (Cos: es a acne es Ne eee RO neo Le oD BY vor eee aa ee SOs Se 398
iillipssketroleurns Co meemiastenen bs edt Boe te PS Se ed ee ee 167
Pranea Sullomvercslolocn: line, 2S 8 A ee Ee ee ee eee er 84
rab ie Omni Me Va COT weeeet ieee aero Re eee ek eee Ss La OP A ee Ee 333
lites Gs JNM Cae ee Oe 5 ae ea i ae OY a a ee Ln ee ne ee, 507

Reynoldssinternati oma oo ea ee a 2 ee 88
Robbringineering. ==. 2 ee ee a ee 85
Rohini «Haas; nes, 25228 ee a Nee ee 5 ee 254
SardashstracioneWavoraziones -2: 2 Ps 22s ee eee ee ee 231
Sear Graphics silin Css see eee ne es =e pe ee eee ee oe 60, 205
Sealine sunGs, == ea 8 oe ee ee oy ae 84
Searsi@Roebuck, (Co. 4 2 ee ee ee ee oe 391
SIBWIGIMUAURY. cee ees Ses Oe) Se ee SP i ge ee ee 66
Sperpyehands!Conp. ee eek oe Re ee ee a Be 509
StrazaylMGdustvicsns ste Ses so ee eee en ts ak Ie 469
StlbyseasOiltServar cess: bil ie ere eee eee ee ea re © See Be ec ee 71, 177, 189
Submarine: Research ands Development Gorpoy es ee ee 55
Submanimersenvicesslincys 22m sawed be We en ee) eee eee 221
SUG vA A atl One eee eet See Se ele ee ee ee 209
SunpshipbuildinerealrydockiCom = oe ee ee eo ee 61, 135
PRA Ore Dvn COC TN COS m pean ae ee eee 7s Seen ere 2 ere ee ee ee ee 229, 605
Mechnoceanis elt C= au ate ee ce ee se Oe, 99
TBEINGiitttn Cotes: #ae nec on is in ee ee ee eee 501
Ab, “AN oy go oSFEN 0 WDA OCG Be ee Seer ee ene he a ep ee Oe ee ee Se 196
SOM S OM == OS an C0 spay eo eee re OE ey Oe Ae 481
Wnderwater,MarinesE quipment. Wid’) 22222 es eee 141
Wector Gall exCosgeeeans hak SMB Se ee Oe 341, 345
MernesPnoineenin passes == We 20 eee! es 2 ee ee 197
WackenssOCeami csewle (dylan oe cot eee ee ee eee 64, 69, 70, 183, 185, 237, 709
Vain pags CLS Gal © S sige a ee ae ee ee See ee ee 346
Western: MWarinesElectronics:@onps, ..-- 2. 5 Se ee eee 469
WestinghousestlecthichGorpin a2. 2. =) aa ee ee eee 44, 115, 117, 119
Westonudinstruments Coss. 2. ee = ea a ee a ee ee 501
VomiuniShimbusNewspaper. 2.2. 25.) ee ee ee 239

740

SUBJECT INDEX

Page

Ale TEA OUD DUS RC eee Ae eae 706
Albsolubespnessunes(psia) sd cline diam =ae ames eet ie es oes Se ee ee ee eee 282
AtiminaltveexperimentalmOivines Uniti === Ee eee 361
PANG CNB 11; Mae ae ee ee TS we De Sd Sa ss So Ls SNE a 59
Ainavelshtwasaunetionvottemperatureland pressure) 222) === ee eee 284
AEBACOREMhulltdracrcoeticientp==.== saan es a aaa a2 a Se ee eae 395
AL COAESEAPRO BE 2x as a ee SD Pe ee ee see eee 705
AMGOceanulmdustresssubmersiblesdescriibed a= ene eee 87
CONLEOMAnrAN EME NUS hae a ee 5 Se os Be ae es SEE ee ee ee 398
PUG CES ETS OLS Wie ete tie et i En ne Sn BE dh ke ee oe ee Be 485
PANT UU VAUTEN AUG) eon eee ce aN alle ee So er WO ee 44, 63
ContractorsHonisub-svstemsangl components). j=== === eee eee 281

GES Chie Cue eee aa” ee Be eo en ee oes = eee 89
examplesroteelectnicalimterferenceronlidatay sass nee 362
electricalapene tra tons teat eee Ane dr SA he ee ee 2 ee 340
null gcompressionuwithiGepth = =i ee eee eee 258
hullRCONS ER CLLOM ewe eee ae Dena e Rok old pia ele Ons ee ED ew de SL 253
CONUTOATEAN CCIE NCS pew oer eee ae Se ee i ee eee) ee 402

VATE VAIN nen Ma 8 Na perenne a Bh lh nt eR DOME AOS, cok UM 44, 59
CLES C11 ye Cl mee a ee Ba capac Rel on nae mt Oe a et CEE Sea AEE ee eee 91
drarsroncevderivatlonsmeth Od =e ae eee 395
null Reams tru Ctl Orietemee ea ne oN ee SES Epa ee le le i ay 252
pressurevnullereleaseisystem) 222 == 8 oe ee ns ee 665
Saliva CebPO MIO 0 Osh tee feces ed Sere wan Se eS Su eee Se a ea Se 561
titaniumnelectricalapenetEratorndesl ors sss saa = aes = ae een Se 351
ETETITT NES VS UG 11 ee Pa ool tn Fe i hn a ae FL ee EE a 304
variablepballastsvstenihwe.s tase ose Ue Tee a ee ee ee eee 292
VIEW DOL GAEEAM OO CMe ta kaa tea ee a ee ee ee SE eee ee 453

WIE WDOLUISERCGS LO SULN Sie) = ae Se ae ed 2 ee ee Se eee 255
PATDIentelihntisenS0 Kees ee ma a we ee 2 ee eee 545
/ANTPAGTACENT 1BHUNRZEV GOES) aupoyoy ayes 54, 283, 288, 323, 644
Glassedisubmersiblesw a. ssre sale eee a Se ee ee 625

Oxy eenICONncentravlonssrecommended saa 412
AMericankSocietyaolellechiamicall Narn oti ee 1:s eee nS 250
BresSunemiesselt Cod epeaawen ae ee nso eh Cate. De to ne ey ee eee 255
PANEER ECS UB pein ae ee a ne Sl i ee eo ee _ 43
ANTVA GETEOU US S re ae atte ed Sa pe ey a eee 601
PAVE OO TETLORS PACE CT ity me = a are ica al errs i ae vn SS 402
/ANyoliecl Reseanon Ibploaremarayy, Wha, Oi UNE NS 175
VAC) AVR! SW eet RN ona ee Be 8 i dd oa aye Doe oe ws SE ee ee 64
GESChibed meee einen as ee Se en ey SO SR ee Pee eo 93
Archie Ol Oe Cell ITN cu PT) se ee a a oe ee a Se Be eee 571
PAVEC GEILE: DD Ee tae oe en ae a lad hs hee a Sr es Es 28 LE 42
CLES Cini Cl meen RL Ae a ek ete ma en nee es es a ae 95

AT ChiIMeGeSHp TIN Cp alle fiine Gee sense ee ee ed SE eS 16
LN E ING NCOM BO Ee ee ee gee eg An ee ee ee es ee ee 2
PAREC CY/ECO) NIE STG pee a a a a ew Agr ee Se Be sit 61
CLES isI 1) c Cl meaner eee senna rac ee A le Be pe RE ae IS MARNE ALS we TE es 96

741

ATES CO tl G4 eae oa a es ee re ce a 1
VALS ED EU eee eh a I I NS pik oe eC he 48
described! 7 22 se eS EE ee 2 os 99
electricalgpenetrators/ii._.. wee 7 ee oe oa ei ee ee ee 340
Isobarisaltimeterisystem), <2." 22 ee ee ee eee 486
Askanita Gravity Meter, 2-2-2)! 3. ee ee eee 553
STC CUMEC AGO ee 2 Nee ee Sd ee ea lc ey Ig ee ee 377
Assocsom@Amencan Railroads: < =.=" same Le re ee a 578
Atlanticulindersealestands valuation Gente re ee ea a 49
Atmospheric contaminentssallowablerconcentTations came ene eye 411
AtmMospherichmonitorime td evil Ces eee ee 430
CabING Dress UTC = 2s = se) Seems Se ee eee ee ee 436
CAEDONEGIONI Gs Sew ek ew ee ae ly el od, Se ee 434
ONO ET ee aE ae ie pe eR ee tt oe che op ee 430
temperaturetand humidity, 25. 22-2 ee ee eee 435
AUGUSTIETPICCARD. 2382.2 tw oes 2 ee ee 48
CS erail Yeo ly SE ee ee ay ed a es Aya iy rR Ee 101
PANG GET Ge ee i hl ee es i od a ol 49, 193
PACZ TV aiiz hak Veg Gente oe sonal ee eee Oe eis Soa eS eee ee Sa, 2 oe 10
BATA peepee ein a ok ee Se ee a ee ee 60
Ballast/and buoyancysmethods, vehicle-by-vehicle) 22222022225) a eee 286
Ballasting Systems, irreversible ——........-.. 222 =-_ 2.4 3.224225) eee 296
collapsiblevbaps: ge et 250 eo les oe 298
as Olin meee eee ee a eS a i ee i 300
War OS GAn Ks eee = a ee es we ee ee 297
ONES 1h O Gye eee ee Sk ee ed ee ee 299
pressumethullls 2 ess ot ee ee eB 296
smalltweirrhtidvopr, 22.224 ee eee ee 298
Syntacticntoaln meee = 2 a 1 ee en ee 296
Ballastin ea SySctemn saree resi] cy mca cen mene cena ns sm ei i 5 sues Ss cg ans gs 288
ATI CH OTIN Gee er ee ee Se ge ee | OA Ee ee en BO ee 294
Ascent/descent:weights: 22 =. 5-22 ee eee 294
dnacgeables Bask ne se A Se ee os De oe ee a 296
mainiballastitanks \ = 2s = se ee Pe ed 288
vanlablerballast-tanks- (2. <2. = +2 se Se ed ee ee 290
Barton Otis = === ous Soe Paola £2 een ee ee ee 32, 38
Barmett ll Don =. 252 eet oR ee ee) ee eee ee 464, 625
1SyeW ia oleess ON LV 01 0 ek Meee ee we ee ge NS aE eee et eae eee ee 497, 593
IB ASSs Georee me. Geek Be I ee ee Oe ee 48
Bathyscapht ...- 2. {ose es 5 oe Gere SEES. et oe ae ee ie a eS ee oe 38
BATHYSPHERE. described), -o-2 2. 2 es a ee ee eee eee 32-38
Internaliarraneements: --2-- 28-2200 2 a eee 33
Batceriessadvantagesramd Gisacvearive yes eee eee a ee 319
cellicharacteristicsioty three: tyes ieee eae a 322
Chanracterishres ot Secon arsyat yes) eee eee a 320
CELA OI Se we eS eae ee ee ee ere 323
CLECES Os pPLESSUNE OTC ACh bye wee meee ee ee en 322
effectsiotpressureron cellilitercricl icy,cliry oye eee ea 322
ChfecisOnecemperablUmerony CSC hier tee. ici Le eee eae en ee 320
PASSING Dela VO EAMG STONES SUIT Ce ee eee mee rn ee 329
passing hazards G22 28 as ee ee eee 324
hydrogvenweneration. 2-2 -5_ 2 eee ee eee eee 324
in= hull lOCAtVO Wee ee ee ee ee ae a ek eB oe a ee 326

DLessUne-nesistantspOGs === eens wees ny ene 2 Se 2. 2 ee eee 327
PLESSURETCOMpensated Gupe= == ==n awn eanau erent en ae iene ye ee = 2 ee ea ee 328
SV SlelneGes] 27) a= ene en eee ee eee a ee ee ae SE oe: ee ie ee 328
desizmconsiderationssonaveniclerdiyimam CS ee ee 330
[SORTER CORES), iat en he Ae ee ee ee a ee ee ee eee ee 330
biolosicalteticct steamer seen tar FS a et ee Se ee aes 330
Silver-zinesaischarce characteristicsrat, nigh=pressures= === === aes eee ee ee 322
lifes characteris ticsmas= ae) see ee eae SNS ee Be aes Sea ee 323
SOBs ol Coenen ie ae Or taint Oe Se See rn ee So See ee ee ee ee 323
temperature, discharge rate and performance relationships __________________________-__- 321
OLGA ERO EOI] CS wammr eis enmn eee a eo SUC tt ee es ee et ee ee ee 321
EAE: Ree ee ee Se ies noe oot iL eS os oS a a OE ee 56, 64
ESCH CC nme am eteriG mn ee arte Sek es. PP) PT Gets es 5 ee ee 103
cControlwarranzeMmentspa m= ssnew ses 22S SR 25. tse ee es ee ee AL sda 400
NOLSCDOW ClavSTeLeClrl CupO Welw == =a naan oes faa. See E! See Pe Se ees ee 397
Manipulacomcnanaccelistics = —as=== asa. = Sse eee ee eee eee 532
Primes Stem COMmpPONen tS ee 2—— — = See. Woes SR ee eee eee 307
Bee bem Walliprn eee eet ea te ae ol i ee eee ee ee ee eee 382
LByalhanhwrea, INeyeroraell IP wyaeh oye sOerouNTKO Ikvaseey Roy See ee ee PA
ES EYNBECECAUN KG NG fs Det Se ee i ee Se eee eee 57, 60, 64
ballastisyste mise ss sees dae bee eae ales cee ee ee ee eee 2 eee 288
GESCEID CC amr aai ae Sens SNE ne anes oh 8 ee tee eee 105
inapacal] ew eemee metas mr ae eae Re eh Ps 2S See ee eee ee 296
electri calepenernato rs =e se a6 tates Se ae Bs ee ol Rea Se See a ee 342
UI RCONS LU CbLOTIe= == = sea Ba wee S98 ss 8 8 Se Se es OO ee 250
lifessiippOLtasy Stel ame See wes 2 De Dente Pees t oo See ee Seek ee Ue es ek ee ee ae 260-265
PELEsoume kemenc@encyxesScCApelSCCNAT1 OM = see aman ae ee eee 661
SOMAnODESV.SUCTT inmate somes tere al at Nn, Sal a a en ee tee ee 208)
bemperatune variations Gn-hull)durmne GulfiStream Drift) 2222. ee 429
Trackin gas y/ Sci eae Leese Baten Oke Ge eee ie Pe ee eee 501
WALEREETIMESVSLCIN een ants Sa mean tens Fe is De a batts See Pa Sue oe oe os Be eee ee 302
BIEN RHO Say gee et Sole oe RRs Os oS Aa aD ne Eee Ng Al Ea BS ae oe 44
GeSchibed Marea Ua Se whe. Gi- eee oo) a a oe Are ee ere 107
BEN DHOSCO PR Eee sees obo BS OS Pe a) i ee ee eee 38
Cheer AlN CS ee meni me Bes Ne a biel Rin! oo ee ee eee Sa ee 484
ES TaRVVCS1C Vaman Met eens Seale oars SA Se 8 CR ba eer ie Py Pe a Eee 449
ES On TNEN) EUS ECO 10 G1: eee ae ee ge Si ea eee a ee eee eee 427
BottomeMappmedinstriments: sss in 128 Ue 2s ee Sa ee ee ee 548
SIMeSSCATESON 2 Laas ae ee™ Nees s ele ea See eS bo eee eee 548
SUb=DOULOMADNOMleT Maths Weaker Oe Wie he aL Le AS ee eee ee 548
STETECOPHOLOPTADMICIS Stem \at sw aeeess Coa 23 oes ee SS eee ee 548
IBOLCOME SAINI A) GV COS iit seams eae ie oa hee ee eee 550
Boy lang bec mean aera sees MN ae re Pee ee Ss eS et ee es See. 10
LBORHIGHS) JUBSG «pe aia OE, ee ee ee, eee ey BAIR ne ee a 284
Brad levallvobe tame aneierncnne MEL oS Ole Ai i ae oer) ha AT ng. I ee ee ee ee 608
Brazosponis Coleco was sane aeeeias ee ee eS) Se ee 2 eee oe ee 213
137:0 ye IY eg a he De ere BU i ed i I Te 7
BUCY ANGVEneGUIRGINEN tS ape sae rence ae eames ee Ser ee See eee 16
Bushnell] el) 2c eee emanate Be ee ee ee 1
BTCC Otten Gea een eee ain eh ee rae Le oo ee kee ele cee oe a ee
Caplestelect ri cal aara =a meiiaes ia fai eg eS oe ee a eee 351
GESl oT SHINE SC meaner tee seen eae of DN a ee ee EO RS ee eT 352
FEU RTT OCLC Santina am IE Arad el al Asp at met a ss be Sa eb LS 3503

Gable-to-sunface; 1imibilicall 2x2 ee aa = ee ie ee 334
CALYRS ORI Vs 232 = a oe os oe ne ee ee 42
CanadianeWepe sole blew rae O TT e yatta ee ee eee ep 187
Canadian: Worces\ 2 = os = 8 a ee Oe ee ee 191
@arbon| dioxide. — 222 ee ee 2 ee eee 419
ADSOEVAN COMI OU aC hale a CUTTS tl CS eee eee ae 421
Chemicalkcompound store eri viel] (fie eee ae a 419
effects of temperature, humidity and absorbant bed configuration ________________________ 424
ONIGLETMO Vals Atri sk Stes teh ae Me SRR RE Pe Mar Pon, se 424
eCHfEctS On cNUTNANS xp = we nha a ee ee 420
molecular sievememovalisysteme sees eo.) 2a ee ee ee 424
recomimendedwlinniitis== 2" sa ee ee 2 a 419
Scrubber system) perormMancesmecOmmnenm Gat lorsy wees ee eee en a ee 420
souLcesrate ofgbuild-ups removals peewee ee ee ee 419
CRVIAG Fe en | ase loen coe bas care ee Se eh ee es ee 60
Centerofbuoyancydenned: | 2-2 se eees os ee ee ee 16
Gove vaveretss Clbivaver Ul oy aaereexsr Vey eee 17
Centemolttenavity»detimed, ses = Be BaF. a oe ee eee 16
Centres De tudes Mariner AwanCess «a a ek ee oe ee 60, 96, 211
Central Research Institute of Fisheries Information and Economics, USSR ____________________ 10
CeninesNationalypouralebxploicatlonnd esi © Ce ainsi eee eae 61, 95, 96, 211
Gertiti catia nee eee es aire ee ea re en ot oe a 636
Chinn Se eae a Se eae ee en ee 648
LIFE OPEN aN let rae ee Ye ete ne ne ee Src Se i Ee woe See 648
WES Navvanequirements,. a. 2.2222 2) oa le oe ee ee 636
ConSiRuctionsandimabniCabloms =e eee ee ee ee 638
INStrumentswextennala —-2= 2... see a! ee ee ee ee 639
operability andmaintenance —.=- 2-22 2 a a ee eee 639
operationalisatety, = es. —- — se aeaelS oP ed ee ee 644
operator Competency, .<-.-- eo ee ee 642
Qualitysassurance,, 22.2... 2c oe 2 ee ee 638

TO CONG So eet ce NN TS US Sy a Ae REO TE a re ee” ee Ee 637
Scope,otscertification: "-+ =~ =.=” 2a Pa eee oP ee ee Fo ee ee 637

SUV Ver Sis cee a Aa ee ees a UN ee eee 639

en IUD eee Op Ses se Pe eee ee geenan Ae eetpe le. ag oh ee ee a eee 639

eS binge pete fase se ee NE eS Ek ee Ee Sees 2 ea ae ee 638
ChavlencergMecn = —- Sat Se ee oc ee ee ee eee 233,484
M@ivarlers wie ware ee ere eee es re ee a a ee 282
Shloratercandlesy >. Wasi er sa 8 ee ee Bais. 2 ee ee ee 669
ETE OO 2 ne el hs Se Be Pe ee 81
Gincuitdesion*considerations: 2220-8. Va oa ee ee eee 356
GOES) oA ODT G0) | eee ee AR ee ee ee ee eee te 356
voltage and amperage requirements, typical outbound components _______----------------- 359

Cle sSiiGeNnGin, AWneTACa hl ISU Ore Slow joioyee eee 644
bpalllastisvstemy 2. 230 oe 2S es ee ee eo eee ee 645
buoyancy:characteristics, --2.4 Se se ee eee 645
calcillationsmequined(.=--="==452 52 5 ears ye oS ee ee Ce ee 645
drawings mequine dy p22 a epee ee ey ee ee a ee 645
Maneuyerabilitveand controll | se ee ee ee eee 646
Stabilityeandstrim) ) 2 ate. Oe a ee a, Se een a ee Ene eee eee 645

GI UI aT ss aad LT 0 hs,02 015 Rene mia ee cas ae nO ee ee ees etre See Be me eee es ee eae 8 700
Mlosedicimenitsb realtime Teme reer GysUS ClO Lapa eee 668
Coast: Guard vrequirements: <= o2-- 220 sso on are ee ee 646

Rescuekanda Control Gentes essen ere eR eS ye 647
Collapsa chyoun, clattines| Sa eS el ee ee ee ee ee eS 76
(CoOminnuMnGAOOne <2 se ee ee ee ee ee eee 488

7, INO IRS aE = Se ee ee ee ee Oe eee ae ee eee eee 493

FOV AES © UIT C= 190 0, aumento Pe eg BN ge ee Be a a ee 494

onal dau ckgeehkec tyes meee senate ae oe eee eS LL OE ey A a hte Se LP Shas Ba et 493

REVO ROVERS WAN XGA GT OER pa aS eo ae ee ee See Ae ee See ae ee meee 493

SUIOGURBYGS. . 2 ee Be ee es ee ee ee ee ee eee ee 492

QUBARVOD Nee oe ee ea ee ee ee ee Ge Sere re eee 488
(Compressedraimandedeballastin gard efit oreo te te vei) spe eens eee ane 282
CompresscduGaseAssoctalhlo niga eres ae ee ee ee ee 274
Concretesapplicationmmepress ure: lua siya a= ae ee ee ee eee 250
Commecior Gecrncall) Clesieang, ell Vel 2 346

Moldemelastomc tamer = ae ae ee ee Oe ee | ee ee ee ee ee eee 349

TNOLGE CR DL AST Cm eaees Bienen eaten Ne ES es Se ee a ee ee ee 349

Hndenwacendisconnectalblew === te 2 eS ae ee 350

RATINCRTIN OG Cc tees = ene ee Me ty Re Se SN et De te en en ie oe ee 345
(Conens/ Oneta Cols pe sees he SE ee ee on Te ee ee eee 713
(COBO P CEE See emer Wenn soo ei ee A ee ee ee I Se 509
COME, UNCOVER ee ote SN hr a ee ge nn em ae en een oe ee a 5, 36, 40, 370
ECA ee nee Srey Saat eet t- SERIE ea OA 10
Chaos ony, 186° 25 8 a ee ee ae ees Se ee eee ee re ey ern 199
(GNEVIES oO n'areeere oe ore nena Ee Be a a 469
GUSTS UAV fp se ae Se Pp a Se Dh ee 2, 43
(Chummanranvavesl aie vials Breech kes se eo eo ee ee Silla OO
(GuiGrentanCLGLs aerator eee se Re nt ee ee Pe ee eet oe een 548
UTR re res oe ee ee SE Oe ee Ry SR ey eh 53
OUTER AV AT a Ss a a es ee 8 pe le A 8 ee ee 705
(CORYTATIN A et a yo 2 i a ee ee ee Pe Ali
DYAVINES TARR Vie a ae eR en ee ee ee a 583
DeeneDiversystemse Mikes lle tS 2 ee ee ee i ee ee ee 701
EE AD) UVB ie Ne en a ee ee ee ee 56, 64

GIGASET ee es ee re as eee See 109

elechrcalipenetEatonsies ie. te So 0 ees eT ae en eee eee 340

GIES S CTT ge, a naeetee ee Le 2S en ka eee eee 304
DY BIRD | DY A Le ee ee ee ee ee ae eee Co ee 47

Glescri ec aust Meeces te a Ae a Pe LO ee es pi es eee ete
DE DROGEANYS URVIEYIVEHIGLE. 22.2. Sec 20 0 ee) ee ee 50
Dear Ceenin Itedimollosay roe 25 338, 346

DUD CAL ON Smee nant eS EE eee ee Ste 28 See ee oe eo ee 9
DEERE OUIES pare trios OE Se eo 2 Oe eS ee 54

Cablesnandlingspnoonarnigy ses. sees eee ke 2 Se Te ee Se ee ee eee 304

Gnenaveell churmmysyiaves eanounavel iaseaateyoy Le 574

Ghrimarine Dine SBME WAENAVN ST ee 23

electncalapenetratordesl ong =a. = = are ee ae ks ee ee Se ee eee ee Re 257

eLuSONable components tees ss mewn eee Wee Ss ee ee ee 26

DUOCSECOMUEO pam e lies amen at OU Dak eA) Oe De eee ene ee I es 490

UCC Bincl Gwe MEMNe Gimmie) 2 378

SVS TEMG ES Cra Cl igemsabrenmema st) ona So SS ee Ee el re es 20-28

WOTANGS Chases oversee = Sl NR a Te ie ee TE a a eye ee ee 113
DEB PISUBMERGENCE RESCUE VEHICLE, == 62, 64

kacveicillovevel - PE _ So a ee ie ee es Deere ene Pe ee eee Se ne See 125

failluresmodesnnrainitnansportation: 22s eee ec oe 578
rescuecsrequirements; . “22-29-22 we Saas ee eee 698
NESGUC SCONALOW = lank ee ne ee ee ee eee 606
Nudd eran GEGivesplarme/s tae OU lee Vereen ee TIN Ye 378
webicle:controlearrangement.\ 22.) = eee oe. toe ee eee ee 402
DEEP SUBMERGENCE SEARCH VERIGLE, 222-2) eee 63
cablewrescarchyprograiniy potest es le ae 354
DeeprSubmersible; Systems Project: a5 eee es ee ee ee eee 45
Deeio Siillormnenyxerores Shyer lvemeny Cray) 45
DeepfsubmersibleshilotstAssoc.- j2--eeb ee oi. Ne eet) 10, 643
DEE PAVE We it eee, Brae ae Ee ee ES ST ee Oe 47, 65
described ides 2 fee = 3 te ee ese >. Ee Se Bae ee ee 121
hulllfconstructiony <5 52- seen ee ee 28 oe ie 2 ie ine | Oe 254
DEE EV OVA GE Riviere aoe oe ee we De ee ee 60
DEE RS TARGA a= 202 es eee eee os ee ee ee 2 ee 44
DEE STAR 2 O00 0 tha See IE a ee ee Be ee es 59
ES Cr CCl eae eh ee ee ee i pa ee oe ee 115
DEE ESTARA OOO) eee oe a 2 ee es a Se So ee. he 51, 63
ascent descentiballastingysysteims 22----.—. 22-2 ee eee 294
GESCrilby Cc tame sears eS IE er 8 ok J ee ee aly
ina tal leah alt Chit UN Kish Bama te tw Se we ee ee oe ee 673
Oxy PCHISUP PlVsSV Steen was s= ed nO. ee ee ee a eee 414
vViewportiarmangement 2.2. Me ek ee eee 454
DEEP STARZ2 0:00 0 prs ee es ae Os 2 Se ak ee ee ee 62, 63
CORrosionkcontrolaproeraims 2222225. = ee ee eee 275
described gereme te Bak Pan aie ee eS ee A eee eee 119
EINE Gi ee ie Se a ete Det re an Ee Se OS Be a ea ie ee ee 5, 207
Density and temperature as a function of ocean depth —--.-___-_=-_______-_-_______=___---. 33 14
Weparbmentsofathes inten OMeso=s, wn S28 ee Fe ee eee 44
Departmentaofehransportationes #222220 co ee ee eee 282, 414
Depth dicatonssstaccorspe hte Gtr cota c CUT cl Cygne a nn 483
Bourdonsttubem=s]2selack ee) 1 Ps Dee ee ee ee 481
MESTS CAN CENL YM CMOLESS UGE Mt ell S Cl UT Ce Type eer Eu 482
SOT CHC C71 CCS mere ae ere eg ae ah a 484
strainyeapespressurestransducers.22.-. <0 2 eee 482
DickmanteB Wists pe tees ee we ee rcs he OR ee ee Se ee ee 40, 131
Differentialepresstnescape: pa-2---— se... ea ee eee 486
Iiesel-electricypower:generationy 222222. 22555. oe eee 336
TT POROD yw seems es ae a a a a ee eS 5 ee ee 556
Directionalvanternae:. 2 + Sees ee ee ee eee 518
Directionalbynocompass y= wees os aes ee ee 507
Diveuplanesie wets = ce Ds ee haere aa a Re cee 9 pe es 377
Divers prolevinssubimersiblemescues a4 2 2 See 2 ee ee 700
ID VAIN GSS AU CE Rios os ee ele eae 5 Se Sod ee ee, oh Eee eee 40, 48, 207
Doppler Sonar ss oe sl oe a, ee Ne ee ee 508
Dos tally atl aA Pe ee a a ne ad a ee ed ie 424
DOV i ae ee en ee eee 56
Ges exile aha eaters are es wl Rn ee te Jee ey eS ee ee 123
propulsionrarrangvements ss =2 wean. baa ee ee 373
Crimi sy Stemiscomponentss. 2 --2—se ee ee ee ee 307
Viewineranranvements: 5-92-08 ee ee 2 ee Ae eee 459
Draeger- MulticGasiDetecto twee s=s es ee ee ee eee 435
pea Pe SR Pai ese i ge Ss ad re Seo, Sn er ee So 392

RON CHIN? Som ne eS eS Se Se SS SS ESS
flat (RAV GIRS 2 Se ee eee eee
IDyaalyal, Crore; 3 es oe eee
iDiay werelits, GlatineG| =. se eS
DRL F ee ee Oe ee ee ee ee

Biiie CLIVeR ONS E POW .ET kG ein) e classe ene ne
Hlectnceowenryapplicanloninys ib mMersio]l es yeaa en ee
TTC TELNET CC lyre a eee eens eae se Se ee ee eee
tenminolopygandieneraliconsideratlonsi === === ee
EYRE ERAUIATD YS TORRID S Sea | Vg ew a ere ee ee See ee
Pimenrcenciessavoldanceldevicesiand procedures ss
aucomaticrdeballastin ga =aeee = ae enews ee ee
ES U0 S ea a ee ee ee ee
lero. ge © jee a Se
BCHORSOUM CTS yatta ees een ee ee ee ee 2 a ee eee
Life RS Up DOLESIMOMI COTS ms eee Re ee ee ee
PTT 1S ee ee ee
SATAN N4S 0 1120 Tage ee ee ee ee ee
SUEAcCe SUP POLL COMMUN EAL OMNES VS LOTT S eae a ener
STRAT S [OO 10 Cl C2 meee ee ee ee ee
UMNO TRIG NNONES ee SESE
EOARAGHNTD CENMCIS Biel jaRoeolbIsS) 2. =
QC NOWACTNG JEWNEON = 2 ESE
HIPENCONICTO] ge ee es a ee ek ee eee ee eee
HI OOGKCOMtNO tame = are ee a DE Wee ee) Ss ee eee
lniain jomesgome: loalilests wank lon? ——— = = ee
rial ace Ub cos eee ee nee ee ee ee
IRS SUNOS EMIT GASHOS ES
mMeanualgdeballas tin le nee
Sasol GEARS Se SeS ese
TOV. Teall OS S eres ean en Oe eee
jomegsmn Twill Relea Wn eS ES
meleaseablescaps il eget es ee oe eee ee eee eee
GTM UO O De ea a ee ee 2 er ee ee ee ee
eT Ol te CO 1 ieee eee ne ee ee ee
design considerations for:
elastin es] OS Spee em eee eee ge
entanclemcn (a= == ama ee ee ae ee A ee
fimerandenOoxi OUSt@aASse Spas eee See ee ee ee
BOWE ll] OSS meme eee ieee eee ee Pe ee ee eee
tamaain Nags) pe a ee
devicesianduprocedunessavelicle-by—ve lil Clem aaa eee
IT CAGL ERT SH ee Se Le NE ch we A Ele 0s ee ne ue Oe ee A ee eS
arecwlomeall logins: wrenedens Choy) =
syeouimulennam Or SaCliREME cL eee ee ee eee
InWONy @IMIRINGIONNGING 2 oe
CO lliSioramovatlawtnc tt OMe ee ee ee Se ee ee See
Glavin fingrraetony Se ee eee
IU Saliva oC meee eres aye Se ee eee ee ee ee ee ee
elect calbtine: mute meat = 2s hr ee ee i ee ee ee es
COMMER AEA UENO NENON GS ee eee
(SI SHENG eos ee ate, DS ee a eee ee ee ee a

TS UAT UT eg a ee ee ee et ee 694
launchiretriev.als 2222. 223 aie 2 Se 22 os te ee a ee 692
lossrofselectincalypow eres es. = a ae oe ee eee 689
lossiofrouttinesballastinigy tee om ase se ee es 686
operabmesineg Navalkexerciserabe aS seem es ae ee 692
OVEEPOWerIne: watericurrentsie een. 2 ee ee eee 692
Searstat cu vis est Sg ae ee ee wn i, Tc eee ee 694
séaswater density: changes). 2220 6 Se ee eee 691
separationfromysupportcrafty==— = 2s. 5 es ee ee eee 690
underwater Collisionve 2224 ss = ee ee eee 686
surface*devices:and! procedures; — 2.5 2 ee ee eee 670
AUN CH OS nyo es Sneed Oe re en 8k ee ee 672
breathing+easiexpiredte: 22 e-22) es 2. 7 2 ee ee ee ee eee 672
flasivitn owlioih timer = Pee tS a ee ee | ea eer eee 671
intlatablesmate nstruinkeen eee oe 8 ee oe a ee 673
intlatableymo@ulesr £-~.-2sew = bo eI ee ee Se eee 673
lifesrat tsi eiewe De be ee ee ee ee ee eee 672

RAGTOISI PNAS Mee 2a oe kk ee ee 671
PACLORLEANSCCINCTS wae eee soe ee ee ee ee ee 670
rocketsrand wWilanes ter wee een oe oe Ae ee ee ee eee 671

SNOTKe Wp ea se Ness oo ee se eb Re ee ee ee 675
lmunderwatentelepnon@es 2-2-2622 ee 671
Enyironmentalifactors influencinggvehicle design; 22225222) eee 14
ACOUSCLCS tae eemens ieee a ie en el Oo 5 ee eee 15
NIMBLE TE Gall nb ye eae tat ea eke e s 14
bottomiconditions® \ss322- <3. ee oo 52 ee ed re ee ee ne 16
CONGUCLIVIty aera a ee Se ee ee ee Se 14
CURTEN TS ye Barter ee lee A a de a 15
CLOTS ts Vigra eae ee ee 15
NESS URC y elie atey wk es Dn ee a Se ee Ben ee 14

SCANS Calle petereiiteedie desert 3 So be ee ee ee a 15
temperat tne S26 co eE ete ee Be ee eee eee 14
Hquilibriumypstates:of \e.=2. ww aes 2k Le ee ee oe ee ee 16
Pxostructunendeined |) 2tecesatw ers. on 8 ee ee ee 263
ExpenimentaluDivinevWnity st sseeee a a ees ee ee eee 36
Pxternaleattach ments) GS1e-meCOmSlG eet tl Or) Sees ea 18
Bxtennaltstructunes pass Se = a ee ee ee ee, eee eee 263
EXOSERUCLURES =) has eS ee eS ee 263
desion considerations =< == =..- =. ee ee 264
jomineito;pressurevhulll .- 22 22s 2. 26 ee ne ee 264
EAU YEU OS ea = ES ee a 265
advantages vsxdisadvantarests—.- = ee Se eee 265
DUG DO SC pte Be hn alr Sat 2 ale oe ed a ee 265
Hatlsafe deballasting s.<<-. <2... be ee es ee ee 36
AIM OW SSPrograin. a2 8 ba at nee one oe a 212
Marrow MONG -eacea "= oo Se a 11
UEIN TERS Nip seen as os a a en ee ne ee Ce nn Strate. SS Oe 35
NRG a tet ties ee Se el AG ee ee LC ee 35
ES CHL sie ag Ic i ee te ee 127

BIN TRS a cipal TE By ees ms dy em ee Se ode OSE ee eee 38
GES CEUDOC pyel tees ee Ee Te A Sela ea re ee Ree a RT Se, el ee 129
OLOTOLE IN ig ae eel «a eS oe a, le Ue ae ak os eo ee Sa 483
HondseNationallidellasRechercherSelenstiti cyte meses eee eee ee en 35

lAtayaval Gy RVG] GMI ee ee ee ee ee 416
Drea UT Vs ees cc Fs es oe ee 65, 249, 255
Folio prate of risk NePnCAINICU: UNG 22 540
HTRACUR® TACs GMOS — SESE 276
Tiranda Wawel Sigel 2.2 ES 129
DETTE 1X GG Fa N25 a ee 95, 127, 129, 133
eTelecare ee eo Pe a Pe ae ee Re ee 331
Twa @ TA, RXOLNSIAB. cee see a 2
Ga enpResstne (sic) sce tine te see oe ee eee 282
Che eget a ee 36
(Crea en i ra I er ct ie a re ny a a ee a ea eee 51
(Galerne ee Atn cic meena eames anon te er Se eee eS 703
Gasrtcvlinders\colomcoding © 22 = 5-2. oe 2 ee 283
CAS EER G0) Ui er rie a a ce ee ee 175
G0 RSE 0 pea a ery ae ee De ts a ee ee 608
(Giovarmnenmmvigel vere TUN ONYGIS. Se eS 337, 648
Class, Cine ag (Ss a ee ee a ee ee ee ee ee 646
CLASS MUTI NESS UTE UII Sop een eee eee a a oe ee 249
CEO BUTE ee nag et a we a es es Ae Os ps 5 ee Sn ee 82
COLD ELS Eis oe ae re Be a ee Oe 40
LES C131) © Cl Guenter Rr es i byes ee SU BS Al es So ee eS 131
Gravitvameasunre ments: = see = ees et eee ee eee 552
GREE ON RG eSCribe dls Sa a eA ee ee eS 133
GrouperdsEtudesjetide) Rescherches!Sou-marines 2s - 133
GunltisenMerolessOre yea a) a see es se ee eee eee 37
CUE DY arent EME ee NEI eee a OE UB ee Et UG eS eS a ee 61
GeSCHiD eC ean Aaleee ean in seb ba Rees oie 28 2 9 Sess sy se Ge eee 135
EGITMIMS YS LG IN" eens = See es Ane eee SS Se ee ee eee eee 306
Wimbilicalupower syste Mp = saeee ene ese eee ee 335
VR ER aa oe a ee eee 182
sTlen ren bt ty ea etn le le ee Ses re ee ee oe ee eee 449
abt ts an eet iy see dante Se). She SESS 2 oe ee he As Re ee ee eee 5
Trae THTVe Uh ees aN SS 8 eae Soe ee Reh i a es aS et eee 361, 648
EsHCea te Hts 10) Ma eins re 5 pt ae ia A ee ee a ey et Se ee eee ee 159
Peeve AUUICU TING eps oe erat ab aD Batt op seals te te al eh en EY Iain ee SE eh ee eee 424
EAT Con pe ae ee et Sg en ik ee te SO ol We ee eS i ee 82
EAVES, er a ee Ne ee se ee eee 66
GES Crit) CC eee eee nea etiaeren ee lest eee he ea tS es Se a en Ft ee Fn oe ee ee ILai7f
Tp lealesye, JOxob oe nb WANG. ck Sek cee ge ge Ee ee eee eee 1
Hardware inspection, devices and techniques ______--________-------------------------------- 571
Hazards, potential for, from:
OUEOTIMTERTC 7a Gee ten rlcion bee oars elt RE ce Ee al awh pec (pe ee tee 634
CA es Eee sere, Serie Sa fro eon Jd ae I Beg ee AP ek aaa tty SOTA eee oR Re a rh ee 632
EXPLOSIVELOFCINATICC Mem reee ww one a eo So se ee ee eee ee 635
TAS ERRUINTLE TI ts aN ee ete a ae a wa Dee et Sd Ped eo ee ee ees 627
launch nethievalasySterns ayes ene ee a See ee eee eee 628
Material seamGEsuib-sy.s terns iene a mee ee nen on ee eles Je ee ees eee eee 626
ODCEALO Tee eine Ai cael Sil ot Pe eek SS ty a ee eS Sie ee eres 627
SUES UIIACEY Grreuhin Caetano aes 2 ee a ee ee eee ee ie ee eee eet 635
STINE CO Ut TET] Capea an mee we Suess a oe da A ll ale es ree ae SS oy es Re Pe 635
EO C Ks een rete eels iene Sais tElpe's oe «by oe eels Serer We ON NEE EE 633
iniganalitesy, Wbeibar IN, eee eee eae Bee ee ee ree ee ee aS eee eee et eee ee 61
Sieliipnan. [Sle wrol TEC iES IOV ae RR eee ee ee eee ee 701

FCC eS AICS as fais ee Da ed ek gs ee 43
LenS OnG!S ees ae Ae A a et ae el 70
EDLKIN OS es a ee ee eS 8 I es ee 47, 55
described eytecs ott es See Foe te ee Oe eee 139
Hokkaid osWmiversity. 22: @a2- 9 Tae bo 3 a ee ee es eee 149
lOmin Gays Me eee iene Ce we Fey nto Ee Be i ad il
ACOUSHICIRCHECEONS gen a sect Oe See i 6 cd es ee Se ee a 514
markenib WO ysteew =o = erie Ee ee ee ee ee eS ee 513
passiverandbactiveracousticitangetsm es se ee ee ee 513
DUT Se 1s Papen Ds Et So a he Be Ren 0 515
CLAWS PONENTS ts ewe eee POSE ee ee et a 515

FAG od Mahl ationmS ys ternisy ke O yell ON ctype eae 661
Horsepoweridetined( pe tens) a eS ee | eo eee 396
orton wl om aSwe aye eas Sa es et 8 ee ee 58, 70
EXOUOtRGE OTTO), Sena = rer Dee ns eee 38
HUDSONSHANDER RRM V2 5203. 28 2 eo ee eee 598
bin penetrations ese od ct oe A A es a ee 5 255
diveiplanesrandtriddersig® =. 2 94 Set ue 2 ee ee ee 258
CLEC bia ceil ge mere eis Nas Oe Do en EE ha ee ee 257
Nacchyshatt stemware a i et ee ee ae 258
atch Cs tien een eee rs J Ses Bor ees (Seen tee Ne BO fa Rie 256
hull entilatvongersee a. a- 2 oS ed i ee et es 258
Manipulators” ese eS A oe ee es So ee ee 258
[Ssh Oy FO\te 8 A ae ee ey Se ee ee ee ee eee ae ee 262
propellerstandiithnusters; ..2.s2...5 2-2 Re eee 258
KeimloOEce mente Owe —— = a— ee, hs ee 255
BULENT OTA US pala a ee ER al Rs fal SO i ae vi Si Be a wt, | ge 258
weishtadropshaltsees@208 onl eRe OPE ee Oe ee. 258
Humantdesigniconsiderations!\=-2.=— =" = 2. ee ee ee 18
Wa tea Cay SE ee ne aie eee ee ee a ae ee ee ee ey Ree Poe 19
foodie diewateri S ce vee a ee he ne i eg so ote 18
BES PLE ALG YG see ae eg ee ee ee 18
temperaturesand numidity: <== 8 2 ee ee eee eee 18
wastepmanacements. so teu oo ee ee ee eee 19
Human MlementsRangerbxtender: (a ssss ss sies oe sees Os 427
Liuimangwastessnatunerandsstonageues= amen an eee en en 2 ee 427
Hiumidityacontroly ss sss eho 42). ee les ee a 430
EV dnOCa Date eats 2a pi ar ieee be ee es A a ee, Be es ee 825
ERY PDTC OR EAIBS pot Seat pata 28 ee tS et Se eee 56, 333
LANUZ Zig A) ee ae amNY oes iy. Pe oo aw ve ae ee ee 606, 608
Ih g¥oRb Y=} IN Yoyo) Cpe eee een eA Re ee ee ee Ue eM rctyrrt, Uncomgee OS wy es 40
IMnstitutphrancaisdusketrole meee = es eee eee 61, 96
INStLUMENts | CONStEAINtS| Ok CS! oma Gy Ap Llc AL O Time ee 538
failnne+moderexam plese vos = as ot oe eh ee eee ne ee ee 542
interference: with data), os=- 25 es eee ee ee eee 361
ACOUSTIC a. 82) ee re A ee ee eee 363

CUE yO a a a Ao ge A Sy OE eal Sol el ey ie ee ve Se a 364
SCrenitiil Chan GrwOrk = ose Pt we ree Lo ee ee os ee ee 537
Insvirancemequirements p= 22. 2 | oe a ee eee eee 648
InitepratediGontrolcand Display 222-9 =... eee es a 2 ee eee 402
Japanyship ss Vachinerys Development eA SSO Comes me ees ae a a 648
deroninece: Wi branicinmy Ou ley aeOMUNO Soe 648
IM; described): =2> hs 20 ses an sae BES ewe ee es ee eee 141

LOD EINSOINS TOY «is 5 SS ee ee ee eee eee ee ee 143
POLINS ONS EAST LN Kegpearetes etre sre ee eae ae See ieee oil Dey Bits ees er a el ee he 65
ele COC MONTE? — = 5 ee Se eC ee ee ee ee eee 430

GUE SOT EOL aT coy a ee es eet a ee a a ee A ee Se ee 143
Jone, Sen@igel 2-8 os eae ee oe he ee ee ee ee ee ee eee 65
AAO [NOSES "po aS ee ea ee ee pe ee ee ee eee eee 3DD
5 () ace re rs a oe PP Sa ee ee ee 55
GES CED cme are connie ee iain ee Sa ee A ER he ee A a ea = See 145
LifeeSUIpP PONUESV SLM see ok ee Se ak es Se 438
TT ReO IR, GRAN 12a Oe ee Se a nee ee ee eee 55, 438
Treen ntl wl kam a Snes ee NE ee ee Se Se eee ee Ses ee es Ole
ikirag loons Nile va «Ee ee ae oe ee ee eee ee ee ee ee 433
KGL VECETCAT ET i oe re a pn ees ee 2 ee ee en ee ee ae 60
Gesatlonel. 2 en Be ee Fe ee en ee ee as OS Se er 147
UTED STUD | by ee Se es oe ee eS er ee ee ee 40, 150
ROTO SEMD WE ee ee a ee ee ee ee ee ee 40, 42
ESC: CC meni eee By er ye ee SS ee ee 149
DOWermecneraLonUmbilncalac late CLES G1 CS) ee ee eee ee 335, 336
PAVSOQUCOUPRENPLONGEANTE _- 2) =s2222- 226-2 22k 8s Se 207
imaboratony oWlWnderwater Researchwlechnique, USSR) 222 10
Fain chyjvecriev.alkSvStemS ups eee Sane Seni e Se a ee ee ee ee ee 592
Aci Cul ategtboonle ss = Se a a ee eee 596

DA OOTIRASS 15 te Mees ant ne ey eee Dar a eIENT tol 5 es Ee te eee 613

eA THER Ya1 2h 17 E Te wa ee ere eae eke A Se ee ee 601

CONIGE TIO. lll cores wee Fees Ye ER ee a BR ee oe ee ee 611
CONSTANTHLETISTO Il Ieee c= Bes AE ee 8 ee en ee ee ee eee 608

Loe Mei vec MB te ee a Tes SS ee ee ee ee 601
Gira o1:1 0 oe mee eee emt Mei ors 0 Se eee 608
CLEVAt OT meee en eee Lee eee 5 en i ee eee 606

AL etsita Cl CC cies cee eee doe Si a Nii a ce re oe 606

UIT Cl oH Ut Gaga eee a ee 613

hinge Geranp mete ee alee ee ee ee ee oe Ae ee ae ee 698
inaflacablewnann pie @a eo ee ee El Ss Se ee eres ee eee 611
TINENteC MO hAliCim ee eee Been sek el a SS ee ee er ee 604

JTePAVE 21 eee eae en ee car Rg ay es i eS ee ee ON ee ee 604
MONsArtiCUlatccmMbOO UI se se ee ee eee 596

COSA. SHAE le | ge ee ee a eee 601
Overheads Meme ewee: Sons ot SN ee ee a ee ee See 598

MUL CKES Teac hiees eee sere are cane nes RP sg SS ee 614
MOMEUTE RCAC HIM Meta e tees = ei Ee SE Seen ne a eee 615

SPAT UOVAWItheCrolleya| sea eemae sues eae ke Slee ae 611

S GE TSIANGI*AUTI = Wi AS eee ne ee ee a ee se oe Se 606

Silt CORO O11 eee a renner a Rimes ae) cee ee ee Sa ee eee 608
SUID IID i CMe ee ee eee ne ee ge ee Pn en ee eee ® 604
Submencediplattoniis oe ete ee hoe oe Ss ee a Jo eee ee 604
E@LESCOPDINT OM LN OO MMe ee ees et eer a a ae ee ee ee ne ee 608
PELESCODMM PAC Yili Cl ery mets oe ieee aera eg ee ee en ee ee oe ee 614

SAAC TA (DETR Caress | se ee ee eee 595
MAC Osterem Ro mibenon Gravwiniete bs ese se eee eee eee ee Se 553
LAER CER). oooh A el Ee ee eee eek ene ee = ee Saar eees 36
[el ieexs Sinan nl < ae ee a kg le eg Se ee ee te a Se ee ears 2, 626
TAN ene ne re ee en pe eat ee EE 604
Ie tii cli \ | NS cree es ee Se ee ee, | he 645

Lifevsuppont)defiried). 5-6 22 a ee ee ee ee 76
Ghanactenisticssandinstrumentiseyelatcle-biysve la Cle year ae area 417
endurance, defined: 24s A ee eee 76
endumances vehicle-by-vehicleji2 = = a ee eee eee 677

TeAthtH A OO KS 0 vane ea ew NL a a Rp SN ee De aren ee nae 615

Mishteattenvation absorp tloms)S GaGte nin Ox eSe eave e eee ee ae 471
SOUNCEXCHALACKENI SUI CS Se pe a Se po, ES 477
transmission.measurementOf- ss a4 4 Se ee eee 547

iDyfedounvares, Gxiqoyerabaareraness loniy LOM bnavedoweyon (Cojo, 2a eee eee Se ee 475
expariments7byeNlWIR DC «28s es 228 ee 476
IMSIMespresSUTen hill: qe eel ee se Be 2 ee ae 462
MOT CUNY VAD OT aot Se er he ee ee ee 473
aN UGTON Mao UGK). = ee ae ee eee OO ee eS SE Se Le ee eke oe 413
Cravokernie Nise Saw ee Ut © Se ee ere ee Se ee i ee ee 473

Patra dione AA ae ton eee eS rg A ee ee ee 64, 148, 379

Meri ca a cars kes eh) ae ee eo yt A el 109

Mioyvdssveoi sterofes hip piney <a see ee ee 648

Mockouttsulbmensibles - sae 5 Se i eee 18

1B) RO ER Ss ee OS oe ee ee ee ee wer WEA eee Fe 594

ELUTE WEDD S RV oT ig a ec Le ees 8 601

Maloneticssmeasunement.Obe s2ee0—. 2 te ee le ee 552

Maimepropulsionedenimeds =e ease 2 ok ee eee ST

IU NON ee See ee _ SO ee Per Sh oe Ee 47, 65
(CLES Te a pu ae Se Nr pe oe ee Rn Sy cy 151
electro-ay drat espropull sir siys tenn) secs sence aa ee ee 391
inflatablesbuovaneysmodules) <2. 222.5 225 ee a ee 673
POOP UIISTONMC Cl CO Si wee eo eg aad ar pr ae A ed ag 373
av eure ca To Le ho ea SNS iS CS AN a ee he I re 292

Makapuuk@ceamtcdGemteratees a= eee le ey ek pe ee 60

Maneuverability, requirements in design considerations ___-______-_-----_____~~---_________-- 18

Maneuveninprotational/trams| ati ome erin U1 11S see eee 371
Dygpropulsersrornllyse se ee ee ee ees A ee 383
byspropulsenstactic dense cipal eyme Shy vse ee 385

IV Leer iTyo Un eat 17S gp alae A a pe eee ee eg 519
GENS ieee ee ec ee oe ek cee Mg R emne ere a eal mete mr 531
control devi Ces yeas ee es ne Se a eee eee 531
Ge fime dl gwen eee eee pe Re eg ee ee 77
desipnrand! capabilities: 50 22. se 2 525
desipnucOnsiderationsi oe ee 531
electro-mechanicaliysmelectro-kny.cmaullicyalct ratio rim ese 526
IANO G1 ON Sink, fee A kegel Ben oy 2 ee ee A} A re 2 ee 520
TOV ame ge eae I a a oe A 523
CEHTNITIO OP) at easy et CO aa MR oe AS eA cee oe ee 520

Mannedisubmersibles\detined: =--<2<--..-- 2-2 S22 ee ee ee 5

Mannedy Undersea Sciencerand) Mechnolopiya Ero cree yy meee eae 9, 69, 557

Mewaueill jorenivere, Ay oyolbCehnorars thay Syolopa avery oS RS) 309

Mare-lsland!Shipyandiyt <2) 5-2-6 n 235

MamineySciencecd @amte tie te ts se ek ee Se we eh ee et 65, 143

MarineslechnologyaSociety == 3s) 2 6. ol ee De ae ee eee 288, 648
Windersealavielnicl ey Go rmninniits tee meee peewee ane ee 409
Wndersea Vehicle satetya standards @omrnitite cy seme een ea Patil

Manitime SatetyeA ceney- dian sit eee ee ee oe ee eee 203

VEAIXOUN ED MV Be a oe Se a Se ee re a ee ee 583

BTR CATED TRU ps Re ee ee a 66
Beeeyeral ea ak ae ee ae ay eee eee eee 153
ITB RAS VATED TAY ee a ee ee ee 66
éloseloeel ” S538 28 4 «os A Se a ee ees 155
Mietneanian Geninech “<0 cee a eee) a ee ee ee 16
Miatincanicie Ineiedat deine) = 17
AND CATT AU ee ee ee ee ee ee ee 59
RINT DINABIR: CeSGal oe ae Sh ee ee eee 157
DN Tei ee 668
ZANT, (USING) ee ee ee ee ee ee 59
Sinoint DASelitine RACINE SIGHT, So ee re iE 502
WOGQYAINAN THT, Seep oe 2 OS 4 en Ss eS a oe ee ee eee 82
iMi@moc), Wineqclona a = ee ee ee ee eee ee 38
Migixere 1Bxaeiy SBT INC Se eee ee eee 623
VIGGO ls Meee Eee ro en ee ee oe ee ee a ee ee eee 388
NOUS, Ce TONG? ck ee ee eee 389
venrarnvest eal vats cll cl emotes teagan ee 391
ouaimnaminching, Ollie) = se SSS 390
GVODMMEHMUIMOLTAeR, NNT eS SES 390
VAC 1 ear ce eer a er A Be re 2 2
Mimimell Aesisinmes IResene aimcl Sralkyayere lei ee 647
Neral, IMGeraON nae ee Se ee ee 34
National Agmomamiaes gracl Syeri@e obras noo) = 2 ee 60
Natonalicouncilvon Viarine Researchiand Hneineering) 225555)" ==) 2s 54
National Caos nne Seman 4 == ee A ee ee 34, 48
iNininomel Marana lisihnenies Seiam@® ... 25-22 ee eee 370
NanionalkOceanicand Atmospheric Administration) 222222) === 2 ns 9, 416
RECO mATaeinGlael Mite Suan: GlWMNOIN ES 412
National Searen sinel lesen bit 2 ee 647
Naiiiemell Ttxcamical linorsmerom Seradiee 2-5) es 370
INPAUUAUTON FH De ee ee ee ee ee ee eee ee 45
SS CTE) C Cl Rane ee ek writ peice eee Se RE pe ok oat ee ek a IE oe oe ee 159
INCA UU So 2a 2 Be ee a a a re ee a ee a 2
NawaleAippliedasciencewabonatory | Soe 05 9 en loos se ee ee 249
Newalmlectronicsslsaboratony. esas aes eee a ae ee ee 39, 556
NeavalaO@ceanorraphici@Olnce 26+ -- 56 om ae ee ee 2, 6, 50
Naw lkOndinan ced vabonauonys === <a sees ee es a ee 706
Navall Ordinance Wasi Sinisa) 225 <2 == See ee ee 45, 111
Navalysips Research and Development’ Center 2.222202) --_ 2-2-2 ee 270, 297
Neralesuips syvstemsComimands -2o. 0 2.0 2 |! 8 ee oe ee ee ee 637
NaNalaicaponsiGenter st nam i Nob ene so wae ee eS See oe a ee eee 55, 139
Nawigation, sae alls lslormmine Siysuenng, lye 22 en 494
DOAOTAN THOU! BKEOUIMO SIRENS <a ees 510
GeACELe CK OM 2 =e = ae Serre Se eee ee Me ee OE ye on 2 ee ee ee 505
ERAGON SS ea ge Ee 5 SS ee 5 ee a ee ee ee 504
MACE CSCOM PASS mms eeame= sek ae Bee ee Oe Pe ee ee See 505
TGC TRL UO S emer ik a neo ene er ee de Be ee oe 498
SUIPBRGO TRACI GSESTOS sae ee ea Oe ee 496
LCUINCES OMA CANI ON Ong ecies eee re A so Olen en la es ee ee ee 497
OUayEReT MHC RO AVOID GAVGRIGIONS ee eee 498

pINneer Eransponder—hy.drophone/lnterno pe LO tee ee eee ee 501

SOG ASEM CRSIy,S Geile mee eee eae aoe ee aR Ses ee rE Oe oe ee 502

visible markers

Page

Nanya Civil Bmaineerin ga bora tory sas any ae 61, 163, 250, 258
NENay Dini evavel Ojorsienmrorass Wieiawell 282, 424
Navy Material Command, recommended oxygen concentrations ____________ 412
Naviys Undersea’ Centerndes 050s Lr a Se eh! ee ee a ee 2 65, 121, 151, 163
INE IKTON ALPHA? eee cs, ee ere Ca ke ee i Os ee 55
NEKTON ALPHA. BETA) CAMMA- described) eee eee 161
manipulatoricharacteristics: 22s 2-7 ee. a ee er ee ee eee 530
FOLATE CS CU Chee ee oe ee Re ee Rs 2 ee ee 571
INEM OF Sos Petts ts 2 2 = a ete ee Lee a 47, 61
aintconditioneisystem. <= ee al een So al et ee he 430
anchorme systemi™, 25s 43 yee ee Ee en ee oe ee eee 294
described Dy ers 4 ee fe Pad >) rs ee ey eee 163
hull’constru ction = se= a4 ieee ee ee > ee ee er ae ee 253
Wie WIN erarranN se MEN tS mesa wee ee NORE ee ee ee ls 457
INE RESETS Oks = 2 = Sere oe Bo Se ee ee 65
EScri bed ey ae a IE ie he 2 hh on eR pa BL BASED 165
manipulatoreharactenistics2=2— 94 tots eS ee ee eee ee 528
INE ECE ED YO 0 eee ae Snes Oe Eos as a ee ee eee 65, 165
INeGweastles Universit ya eee 6 8 ee ee een ee ee eee 406
Newnan ye) (0 lanier ete Bere Ee? oe bs ee Ee eee es et et oe ee 506
News VorkeZoolosicallMuseumt 2225... 2 a ee eee 32
INTEINOLS OTT AAV VE IV The eee ge ne a A go re a ee 420
Noiseeffectsjontoperatom ae es ee ee ee eee ee eee eee 462
INonsuch¥lislandBermudan eves 22 28 Ji es aia oD Pere Se peer ey er. 34
Ne oe aes Beer erat eh Pm. tn teh ews Joe PA. ce ee ee 60, 334
INOLMAlsteniperatuTeramadsp ress unre (IND E>) mil etn e Cleaners ran ng 282
INUIClEa TINO Wels mee eee eae eae eek ny) ES OR a ee ee 334
Obsenverssdetined » Se see = asi o> sa eS es ELE a ee en 76
OGEANGR ELAS Oy Ss Pere teu ite a. see ae ee eee ee 209
Ongena oma ino, Wel eyouin love, 2 147
Oceanieinstituter, Makapuul Point) 2222288 eee ee eee 147
OfficeroMNavaléResearchiwase 2 Se ee oe ee ee ee 39
Opentcinewity ore atl een ers oe 10 cya Se gee 667
Openationalimstrumentsramd de vicesy (vehicle) emer en men nN 467
Operationaltsatety. a= eae soo Dae ee ee ee ee ee 644
Onperatine:depthsdetined 2] ee Se ee eee 76
Operatmne/Sctentitickequipmients1c © hire cle eee eine me ee em 76
Operator define ditme se t= Sei ee Bee Sor De Ses Do ee Se a eee ee Ti
WiISINFde fim tio mes ie ee, ee eg ee 642
OPRSUBNdescmibedy -2 1h < ies Wat es ee Ee ee Rees oe eas ee 2 167
ORTOLANE (AS R=2 2) ie ee a ee ee eee 703
Oxy cenrconcentratlonsettectsyo nny LAU eyr1s eee eee ee ae ae 412
concentrationsirecommended by, MES) se ee ee 412
COMUTOM LLG wea Ft tes ae ee eee Re? ie, 414
external internals torag eure Ue Tyye i seamen te a 412
hqurd advantages ot mlm eae Oe Boe ee ee ee ee ee eee 416
hecommMendedtstora cent] Aska preSS Ure sees ae aaa ee es en pee 414
Teplenishimentwase Os a Se i ee ee ee ee ee 412
SENSOP@scakwaterrn Me fee. pu ee ee a ed 544
Rallanper Gedroc sess Seema te 55 Le fees ee es Oo oe ee 357
PAU LOU? 2 Sek esi ese ® Se ae Be POOPE OL PD oe i ee ee ae ee 64
GeSeribed i Mts Saks tee Oe Cok a ee ee ee ee 169
Payloads detined: 22 28 =< Pek ee) 1 ee ee ee es es 76
requirements'in; design oe. i0<=2 e822 3k es ee ee 18

FEB OK © ns pet a a ee ee oe eee ys 176
FEOCB AN (GD) nae eae ee a oe ea 45
Bharat overeat pa a a ee eee 171
TRESAB 2anck nk ee ee ee ee Oe ee ee a eee eee 43, 50
desenlyatl. Sat. S. ae ae ee ed ee ee ee ee oe ee 173
TAUGGlerP armel GUNS OS GUAR SVN TONG, a EE 378
IRG3=X@describ cds ee ee ee Be a 175
F205 = (en re ee ey eS ee ee ee ee 55
GESCEI De Cie seine ea Cee ee 2 a a een ne ee eS 177
AG RAB. Cesena Sates ee Sree ee ee ee ee 179
EWU EATEN TON CINE Sia Sue ees Benen a ee ee ee eee 458
= eR in ee NE es as ds SR ee es Se eee ee 229
TEX ETON ~ es 28 Ee ee ee ee ee ee Se eee ee ee ee 83
G21 02 ee ene RR ae ES el eee No) ss Sa 5 en A ee 83
IRGZIARO cscrilbe dlmeennes fom en = Sa a Ss ee es 2 oe ee ee ee 181
WehiGlercontnolkanran CMe NUS sete eee ee ee ee ee 399
TEL 0 2 a re er 2 A A OE ye ES ee oe eee ee 83
2 | pee Pe tenes 8 Se Oe EB ee ee ee 237
2 OG ea etre ee ee ree 2 a oes A A el es eee 83
EMeGhavorse CleGuri Call) Ruv;0e Si eaeeee = een 338-344
hc Rembrsyaa1 216 wee ee ae eee ee ee ee eee 344
nlltastenimoimethod ss 2-2 2 tes ee! See ee 344
nllgseallimoume tod Sie sae ete Bo ees oe ee rag SS Oe 8 ee ee ee 344
IN SEECECY DOS mueeset a meee Seen Se SP ee Bee Bea eB es ee Se Seo ees 344
mioldedeclamdutyipey = ==—,. se 5 ee SE ee ee 342
PRETTY, KONO, Sa ed eee ee 2, 43
Rersonneleandushorestacilitieswe= 2-2 aan eee el ee ee eee eee 617
Rersonnela@lransters Capsulege= ses ee ee a ee eee 661
ON CIM CALC Ween awn 20 2 Orne 2a es Da See ee ee 647
iiladelno nian Wari tines Mise viii as eee ee ee 215
TO EIN DXG6 6 peri eg renee, aS ee es ee A ee 71, 337
photography mUnNderwatery pew eae se a ee ee oe ee ee 554
FT CC URC PAU US Ce me eae ere ae Se ee 2 es ee ee en ee 34, 296, 487
Piecaral, Uaveciias: 5 ee Se 3 ee ee ee ee ee ee ee 38, 39, 48, 57, 483
PZT CE ONGC S 2) 1k) eit ee a ie a Si ey eS ee a 703
1 © ee ec ne ers) fe Oe ee Ce ee ee ee 7, 76
in otn ead efine Cees eee en ee Oe ene a ee eee 498
PTS CES) meee eee Panes Se oe Pe wei ae ee ee ee 52
describe cia ses eceeesen or ae lees a 8 ee ee ee ee 183
POlEMMELUSDOAISAlVAL Chee een ene Se ee a ne ee 573
(eoneaevola) TREAGENVEN o= ee See ae ee ee ee ee ee ee eee ee 557
IBISGESIIIMCescrib cope soe ote te ee ee ee Se ee ee 185
MOG CALIONSELOGENOnthT Seam ne mee ae Oe Ree TN See ee es eee 406
PISGES MT 2 See ee ee ee ee ee eee 60,68
Ghosorallerexo| Se as ES co ee ee ER oe ae ee ee ae ee mee 185
RUT ORIC hata CLETIStICSa 2 = Ser eae ye ee ee Oe ee See 528
HOSOUIS: EVENS Gia SRST ee oe a ee ee ee eee 707
PTS GESELVAC CS Chiba = ee nn ee ee eee ee oe See et de tS 188
PPIQHES TMI | 2:2 a a a eae ee in eR 64
W, cesaalosol’ 2. ee eee eee eee eee ee oe ee eo 187
ES CE SEV ee en enc SE OR ye a ee es 83
PISCIS WHE se ee a epi = See ee cee te ee eae eee 83
I ESOE SAV eee a ek te Nes i coh Se. Bt ee 83

IPISGE SOX (ye PaaS end wh Se See 28 Se Se he dS ee ee 83
PISCE SX 2&2 a ee I es a ee a ee ee. 2 ee 83
Pitch/rollindi¢ators®? 24.2282 22 Se es ee 488
PE GAA) te ee a pa eee = Se eae el oe Be Ee Dee le oe ls 30 109
PE GHAB Set Je oe Seg Se Sh oe le ns So le a ee en 201
ENeuImMaAacle pOWers app liCatlO re ATS UIT SIO eee en 310
see also: deballastingsandicompressed eae: eae ee 282
PORBOISE stots oes S en sie) oe oes he ates eas a Fea See eed Per 2S ee ae 84
Rotassiumssuperoxides «2-2 ses = 2 seamed ners = 2 =. = 2 wi a ed ee on ee 424
Fower*electricall) 22208 soba ons Ee 9 1 po ee onthe oo 8 a ee be eo se ee 17
ower distributions (2 === =~-Ae enor Be i. 2 oe ae res Re ol 3 i 338
Powel sources detined ty ysesese= see ten oe Sd ee I. ee Se oe ee 76
characteristics pviellele-toyavie linc) eae mee seen i aa cee 311
evalWationl crite rd ave tetera are Os Pl el Se Ls ee ee 316
GCOS Viton os 6 ee eke See i Se oe oe i A he ee En ee SY le OO 318
mainéainability andinepair- «-see- 22s. oe ae ett eee os Be eee 318
operationallinand linge Sa = = en sn a BO a ee ee ee 318
Melialoilitys aes ere ws es J se eS he ee Del I a oe 6 318
totalkrequinemenits® 22 s= 2. 5 os he oe one aes ae ok oe 316
welchtiandsvoluimess2=2 <2. 8220. eu levies 3 = See eee ee ee 316

Power spectrumyvanalysis eases <= 2.25222 ee ele Bae oe ee a 317
Pressurescompensationsbl tds =2 2a <2) 2225 eek oe 2S ee ee ees eee eee 332
Bressure hull tdetined ates 222 Mie = 2 5 oe eae bee ee lL es eee Oh he 76
depth and payload as affects configuration and materials ________________________________ 245
fabricationsprocedunes! (28462429)... Ue eke 1 eed ee ee 250
AGITESIViE Seas SMe 6 I rn ip en A me peed ch RS on A 253

Bolitin(e ie ere orn Pees ee ek a de se ee oe Dee es Se 253
Lepr iin oe i a he osm ae me rh A ine to Ve eR OED Oe 254
glass:tozmetal bonding 222-2222 2ssee wanes 9 ns a) nS ee es es oe 254
Welding ire se eer Be oo te pene wee ED eee lL ee a OE 2A Se 250
materials’ wens ee be A Sn ne bo ee eel lS 247
chemicaltanalyses:ofisteels. =2222s22222 5-222 wa. Se ee ee ee eee eee 249
measurementstand tests! soe oe ee oe ee ee ee 271
SEPA PACES 4 oe PRE nes 8 Se A ty oe. penn pens Une 0b lee eo 272
testssprocram for: ARVIN: 22222. -S- sSensase ans = 2. Wok See ope ce ess See 272
VOLUMEtTICStEStin Gta Soc 8 es Seen ded tes hi ea kegel 274
DPROPETbIES eee ee ae oe Be ee 2 ee eee eee 247
brittle fractures == -«<855 5 Seen sek eens Uihel we 2 a ee ee 2 oe 247
COTGOSVOM nef Pee a ey ee wre Bo ee eh et ee ek ee 247

CHEGD Yr) ce 8 eee ak ea tee he Sees On ne hn SEE Be bn es oem ee 247
Guctilitty, ste 0e © eee ce Ga oe ae tl ee bn ee a 247
fORMabilitiyes: oe See ed OE Se Feet te oe he ead ee 247
fractunestoushnesss 22522 3 r ee Su Nets nile ean EE cee 2k 247
lowseycle Pati git Gye ae ee ee ee 247
reproducibility? ot ewe ee Se) Rs ed ee ee 247
stress-corrosion/ cracking: 22 =~ en ee eee ee ee ee eee 247
stréss-reliciiembrittlement (22 02 i = ee ee ee ee eee 247
weldabilitvcs 2422 90a ees Se a oe ee eo) Ed ee ees ee ee 247

Seat Gy Spe es alien! oo es Sa 2 bl ee Oe i A ew ae a ee 241
advantages and disadvantages of various configurations __________________------------ 245
basicconhieunations: S222 222 oe: Aes ee eee oe ee ae Ee oe 246
potential configurations and W/Diratios tor DSI Vs eee eee 245
materialssandidepthsy velaicl e-by=vieli cle =a ae a eae ee en ee 242

ERessuneutestin exe enercl COMMS erat O11 S pee ees ee 266
Precis test iGihhes 2. ee ee 276
are tz ea feted 1) 10 em ee pe ee a ee he ee 685
PERRERVANIN DTD) RR WTI ee eee 60
PYAR, IDO GIS aa ee ee 395
Tecan, EP VAIMOIES) e® 70
Preonects GUIDE WIEN se EE 53
Evrae INMICINGIN| S S22 Ses Se ee ae ee eee 39
[Progen TULTVNING SS a ee 351
Projauillsormieoraneoll Glenmess, Cleviinvero| SES 76
Propulsion clewicas, @yclolall janelle 5. 373
Giwreries] jonray ere es er eee eee 372
(BRED fOIROACIeTES. a ee eee eee 371
Deane TGPAHANS) oe ek OR ee ee ee een a ee ee 372
(era LAAT FOVROVON SO ES 375
VEMGIVC CHD EO PU SLO Mes ere eee oe NE ee ne ee ee ee ee eee 377
Wer FOS ae Se eee 375
TPLROPDWIIGNO IM DONIEIP TRONS) eS 395
PSTeWTN ePAUT CLL S ae ee Ps Pe es ee es ee ee 555
PF ariel Be ee ee eS eee eee 84
PSSM GeSGrily cdma sere ee ns ee ke ee ee ee 189
Ren GHOlO 1 CAlEAS DEC LS mae eee ae as See on ee ee ee eee 463
bon CUnOGy Clem seman: fata Sours a oe eosin Sie ee ee ee eee 337
Pisypelamor Neel ee Se ee ee ee ee 337
EU GED EVILS TR ae ps ne ee ee ee ee 209
Peal, Aeovaray es at ES a ee ee aed 624
PDX 9 i eo a ees ee 101
XT ee Ns a oe ee ek See 57, 105
TUES STE TE Dae SS a aE a pee ee ae eee ee eee 2 ee ee 84
FEC HITT tz APA GLIGG S leat ae ee eee ee 39
Rescuendevicesitolassist undernwaterebne vial ee aes ee 675
TCOUS TCA ne in et ony wee Sener ee ee te eens 680
DV OLG ANCES OIL eee wee toe eee eee ee ee ee eee 680
Enwinonmentalksensorsmeseeens ener eset Oe eee ee SS = eee 683
externalaconnectionsi (airy aassel ec): ewes en ee ee 682
SGC METI li Fats pee ere es ee ee a oe ee eee 681
litte Ad Cyc Smee enon meee Sere Se SE) oe be ee Se eee 682
MIDEK CAD UON S eee ae ea ee Skee Ne eee SS ee ee ee 680
Cele phones pees mee ee emer es ae UE es oe eee ee eee 676
[ROC FROUDE, TRACOM, | ee ee ese 700
Und ery aALerapPeTSOMMe le tiem Sic Teme eer enna En se ee ee 695
Reseanrchbinsthuimentsiae == meee eS ee ee ee eS eee 555
APPKCALONMINEVATIOUSHPOJECtS, sane eS te 2 ee ee ee 558
IRe@wjanmenoray @Qunareiierane, Cereal a EE 419
VEVAOlU SH MRIEO IS ernment te oe ee ee ee eee 44, 48
Event Old SaniUTn bc rameter ee Se ee Pe 393
ReyMoldssOshornew@stiskeiiue mates Wes See 9 ee ee ee ee eee 393
VOGT te Tuer a i ene RT ek ee Ee i ee ee 488
ROUT OG Ci:s een Sat Be SR ge en a sD 2 ee ES a eee 377
Ringsiaaie, Chm co ee eae a ep ee ee se ee eee 159
Saitetar Raaiuiives, Chaliareys| ye eee ee ee Se ene ee ee ee ee eee 77
SantagBbarbaranGitva@ollege,. meses wate ae se Soe Ue ee ee 123
SAVOTTIUIS SCO LC Tamer ae eee a ne) ee De SO oe eee ee ee ee 8 ee 487

SCALDIS SM] V5 2222. os Se ee ee ee 38
SchartfenbergerG ol, ose 2 a eee Sa ee ee el 51
Schlumbercrersside:walll (corer == se 5.2 a eA ee 551
Splice hse Se es ee Se Se ES Se ae se, 353
SCORRION US Sie ee Ss et oes a Se a en 63, 511
ScenippsminstitutevomOceanogaar lirypee meee ee er ee ee 111, 219
S GET AeScrilo ed 2 ee a a is a a 191
wehicle:controlvarranzements peo eo eo 398
Seasbottom ppercentol: bottomiysecc ey tine ee ee ee een ee 246
SHAG GIE Etre =~ = oe Se 2 a te ee oe ee a ee ee 57
describedth 20s. 222 enen se ne ee 193
Manipulators eta ee ow ee RL 0) eo eee 2 ee eee 528
SARE XU OO BU a ee F ed e e e 84
AS EVA ERCUINGDAE Eon VA) Vag oe ese ee a ee eee al i 592
SeaghifegranksWalinan'al oyeess- 2. BRS a eee ee eee 147
SEAT OUST Rip oe = Sees aa See rete A es 8 ne oe ee en 64
GeScrilb ec sen seewnripnope ss 2 ie ES a ee a ee als See oe 195
NOVA Ul AGO tga ee er ae te Pe gl re ee 2 gon eee a 525
rudderrandiplanesarnangement: 2...) ==- =< ee eee 378
SIPAGRANGH RA described =o. 2 ee ee ee 197
SEAL U ANY ap ee i paar ee Se ee ee ee ee 55
eS cribed epee ree ee a ee e 199
Seaystaterdefined as.) =-- 82-56 MIF. Se ee eee 14
STAKE CtSKOMEMALIONS terraces ont SSO eb Sa et eo 595
Seapwatemidensityranditemperatune aos eee 14
SOUMGESPeeO INOR 22 ene ee. 2 a Se ee oe eee 15
Searches dees CUC MES POMS IIIT Spl rg eet eee eee ea 647
SearchysimulationsexpenmentsyDSSV <.-55 se ee eee 452
SPARGHSITARIIM | Vi esas eee 8 oF en ee ee ee ee 59
SIAIVPAIR KEM Vx ee AS 8 a ee ee ee 588
ISH VETRAINICAG | 2 <= bx Sees oe 2 nr es 2k ee 10
Shaftzhorseypowerxdetined! ts. skis Ee ee ee eee 396
GENE pee eee Weis etree Ge ee ee Ee ee Sk he 397
SHE EEED VE Rae 252-0. seats oo Leek eS ee eee ee eee 56
GUSTS cflloveye | aM Sees Se a eS ee ee eee ee ee ee ee Se eee ee 201
IMAM Ulatoe soe sw So aes 2 De oe le te SS A es oe oe ee 528
View pPOktrarranvements =a. 2= 220 - - i a 2S Le ee ee 456
SHUINIGATGescribed se 28 ae ee h cok e et 203
Shiprotsoppontunityiy ee ee = es se ee ee U0
Slantsrangeadefined? 22-2 = et a os eee eee
Smuthsontansinstitutione oe tet OS ee a er ek ee ne ee 65, 109, 143
SNOOBE RSS sal Se ee are ie ows NAS ls ee ee ee ee eee 60
describediy 22s tetas oo et te ee a ee eee 205
Sonaryacousticimagine . 2.2 2 eee eee 470
(CR Mitpaeee es le 2 ee oe ee Ue ee ee ee ee ee ee 469
echorsounders), ess. ae Se) a eee 468
Wesmariseanmin panto a le Pe Oe ee 469
Sodan [eseRIROA IMPOR La 44, 121, 163, 271
SovietAcademmaotsSclences! ---2 J22c- ee nous Bs ee 83
SovietaBlocsubmersibles tees ee.206 = ve es) a ee eee 10
SPS OO ee er opel le ee es 207
SP =350) described: ei en ee es eee 207
fuelicell'experiments2=- = Se ee ee Se ee eee 334

DRO OUUOM BANGS, 2 ee
SPLARND) @ £2382 See 2 Ne a ee ee
CERN NEG wane S Po 5 ae Se ee ee ee
LS FS 0) Cm a ea a ee a
GeESCril) cl game eaters tee See en eee ee a ee ee
SHanis ted ebombpisearchi gees = see. ee SS
SpaacLemdinmanes, denies! _. 2. --2222-- =
Syowael timaliceweress ss a
ISIRORTS MAINES OOV SOOO) a aa a eee
Glagenibeg) 9 jy. = saa pee Se a ee Ree eee ee
SUNT IS 3 UII a
Sialon ay, RAG RONROTETNES
Salo css amen emer ee ate ee ee ee Ee
Sine nity, ele See ee
Siovraclarrel IM ins @aerGEGInISKES 5
Standard temperature and pressure (STP), defined = _______________-_---
Standotmdistancessampleicalculatiors se
GIPAR TP gh RE Sat Se ee ee ee
Ghegyersl reve ly ee eS ee ee
Ruel eal SoegaVSTeNTTET aS ns ee
STRMR I-22 ee ee ee ee
Geschi be dag sents tein oo eee 2 ee ae ee
STRATE IU £5 3 ee ee ee
Gescrily ed emer tae eee Te Se et ee Se
personnel emergency escape procedure _____----_-____-------------
veluGe comuenel raramneemNeMS) ~_--
Straimmcare samplemeadings on DSRV—2) 2s
SUIBTROGA.. eee ca EE ee ee ee
SUB IUAUN ANU din (lec ei) Bes es a ee
Glesesiloacl - a ae Se ee ee ee
SUIBIWVAINA Ulta (Martine), 22-25 oe en a ee
GESCHIDe Cemeeeatt eis ete eT el ee
direselkelectricisy stem) = eee ee ee ee ee
LUGdderandidivierplanesanran semen t= == eee ee
Mi ew POnGAnnan cement eeee n= sa ee eee ee
SUBSE RA? "ope ee A ee a ee re ee ae
Glasvergil ners) ys ee er ieee so ee en a ae a
Suibmemimnes Developments Grupos Orme ge a ee ee
Submarine Rescue (Chamber, rescue scenamo 22-222 === =e
ROQCUO THACMMMSTNAMNS, 2
Submersibles, data sources and references _____-_____-----------------
Cenuincavions proposed legislation ea
COMERGIEG Gy COS meeenntt mk lei tem ) DTh a e ee e e
Glomiinaal Oe VAIEIS) 2 a ee
Gletminvacl Toy WISIN eee ea ee ee
CeserTNWe WaIMmlinOloyay —-- ==. oe E
listinespasteypkesent-duture: veniClesy === ss ee
(DUOC AIMOMS OF WERE: 2. EES
MESCuUeKd ei Ce Sram d abe Clann CULES age ee
MeuMevaledevaces sam pueclirny CUES ie eee ee ee
OND Tal AGUS Sa ee ee ee ee es ee
SOS Chalibieel ips ee ee Ne ee
Sulomaers ilo Ces y;S tenn y cementum Se ee ee ee eee

designiandtoperationallconsid eration see ee 13
Submersible: Satety: Seminary ec. a ee ns ee a ee ee eet 683
Supportrandioperationalicosts.. == =k ns Se ee ee ee ee ee 594
SUpPPOLUCONSId erat OMS sERAras p OL yb) Orie ee ae ar 19

laumneh/retricvallge > os 23 SP ae SS Beers 2 20

Po eat Verias ee Se eS eae eae ae le le a ee a 19

trackinelandi navivation’-<oo4 ee) ss ee ce ey ee a eee eee 20
Supports plattormss submersible related eq unprine rit; esses eee een ee ee 592

UTI ChION SMe em a Se Fe ns Oe ee a Se es ee 581

representative Craft. 2. 5.) see tee sn a eas eo a eee 592
Surfacetsupportydehined ame... ~ seas De. 3 oe 2 ee ee eee 77
SURVAdescribeds- = 2.542. 2 sees ey 2 ot ee a 227
SURVEY sGemneds tesa e2_ tne oe es he ee es ed ee ee ie 544

INSLEUIMENCS Useqducoxcond Gta = ae oe eee ee 544

weightskandedimenslonS~s 25.42.20. -2555..22 2 222-5 ee Se a ee eee 545
SURVEYS UBS oe cee eh oe os De ee er 61

(GKEIS(S ol oysye MRE ae ane cS ee ee ee EE NE en ee ee a 229
ES IY A TINA TV cme a yn ee i NS ee oe 587
Swimumnerdelivernvavielhhticles 22.222... sk a ee ee ee eee 5
Sy CAGE Cyl AIT ey eee ee oe a 8 es ee ee eee ee a 296
YANO) XO) 0 Dt ee ee SP ee 2a Sa Soe Re ee Rares oe a een RR eee Se 85
DAUR 'S pate eevee eet DFM a ee a ek 85
RE ED TVET ge I ee ly be 173
MRCS vai S10 Tigi aie Ce ee eg Ne as tl oe al eee ee Le 480

lowalightulevielQm@iwe a oslo Baltes ond ee eee 481
Remperavunerandsnumniditvareite cess omso CCU ATS eee aap 427
Memperatunes.combrolmmp Res sure a knw | ee ee ee enna aL gn 429

layennesinepressunevh ilies ee). 2-2 4st. =. eS ee eee eS 462
MexasvAtG MMUMIVeTSIGY. ==2-.e 2 Ss ee 181
BIG FA OVIA TS SON TeV wie on se ak RO 0A St I Mp Ph 0k neat OS 625
PHRESHER USS O22 Se os ee ee ee eee 45
Himrustensed elie ds eke SNe tear a Tees De eet RS 377
miburony Marine dMbaboratoryes 25225 ee ee eee 213
ime-latey denne diya" 2d es Se te 5 eet eee 707
MOC IRR Raikes eee Po ae ee ee ee 661
ihoolswengineeringwinspectionnsalVage. Gs...) =— = a ee ee 557
ogreawellerwViar Ce eee Se ee 43
FRCP IKCANT irs ee Es Ne oe he ee a ee See 85
hopaltpower-<capacity. defined... 22— oo eee ee ee ee eee 76
OURS G4 S66." tao es os ee es ee eee 66, 336

descenibed! *i 24 ee et Pee ee eee 231
PracercontaminantsS: 2 2- 2s ee es ee ee 426
Mransportation, all 22. Ss ee Se ee 580

Nepnid etch ct SN a Se ee aon 578

Op gh a ene an ees GIES me eee ee ey OR oe yh eee oe et a 579

tederalureoulatonyCOdes)) ma a a we cree ep 581
TRANSGUESTAMIV6 qo oo a a ee ee ee ee ee ee 590
TRIESTE VsAdesion 222.92) oee 2 os ee ee ee eee 58

describedttsss et oe ae ol aS ae ee ee ee 233

electricalipenetrators 2202-255 ee ee eee 340

hullimeinforcements; .2 5282 es a a eee a 255
RTE STE 20 e352 Oe ee ee ee ee eee 45

SCHL) 1 ee ON i i le he ars wr Rl pak ie 235

lnUIlll COUNGWANCHGIN a= =e 52 ee 2 a ee ee eee 254

lleenaelayiRaneNall OGiGES~ heey Ae ee ee ee ae Se 2 300
T= en ete ee ea a Re ee i ad a 7
@kenmiineyel © ws ee ae SP ee See rr Ce Se LE Be ee ere 76
FRET (UWE OVENS SO a et oS a eee a ee ee 16
SHRISIONS Gxerarmnell eo jae IRS NI ee Re en eee 304
balllasthwelontgd no peat =e een Sd Sete en Be a ee pie oy we) ee ee a le 306
sets tee ra yanss Ih tegument nee ke Ey pe ce ae Le oe ek iy to be 306
IMME Chinese alll) se Se = SE ee ee oe ee ee ee ee 306
TONGA EOS ES ae OP ee ee a ee ee ee a ee en ee 304
OU WRN eS ee ee ee ee ae ren Fee ee eee Oe ee Oe 307
Shotghoppeneditierentlal giles > se a= = ee eee se eee re 306
WASTE Chun eeeReraL OMT ee ee ee ee een ee 304
Vel elea CI ci)S Le Geers ae ey RO tS we CS Sue Se ae ie ee aoe eae 306
SVSLEIMSgNSIdeypTESS Urey Ul nee es Ses ee ee ee 301
WNUENP TOKE oe a Se a ee ee es eee a 302
WEL Osh GES Hi eee = aera ee oh Nn eer Oe ee Oe ee Se ea 304
SVS tel seaeml Cle ty-ve tall Cl erage eet se iets ny nae Se et a es Sn ee 306
SEN LeeeeDe eo Se ee ee eee ey ae ee eee ne es ee 229
TRUDI OTR ws 5S a Se eee ae a ee ES a NE ee eT Se eee ee 5, 189
Ube Bushinellis) sy 828 2225) oe ee ee ere eS 1
TN UTR TN GTS QUUISIN Pi oS et a ee SN 2 a ay ae ee En eg Te ge ee eR we OS eee 57
GlasGiailasels S55. = Bee Se ge ce Ee ee et ee ee 193
Uicleaill, Sirenyane- So = 7S ee Se a ee ee ee ee awe ee 44
WINDERS BAQHIUINE Re | Viasat ee ee a ee ee eee 586
Windenwateratelepho ness mee eee a ere ee eet ee ee ee ee 679
LUTE OONE «Sati a aT era a eo Ree es eee eee eee gee ee a 508
University sol ennsyiVianilawes saeoe oct Sl Oe 2 PRN 22 oa ee eee 571
Ora ZeTES (yao tid be alta Sy loycea ra ea VG rs ara eee nN 48
WinmreannedavelniCles seas seen ans ea eeein rs Oe eee Se a ee eee 703
CREP oa ee oS et ee ee ee ee ee ee I yas ee oe ee =
WS, Aitte- TRON = Ee se Se ee ee ee ee ee Pt OS, ae er eo 171
USS, Airy 2 See oe pee re ees ee en Oe ee Ey Cu 172
LOISSUUA Gy UDO Ree NS ae Ea is Ese ee ea ne eae ge See re Re ie A Georges yee Se 593, 615
(UPUREA eS a ee ee ee a eee epee ae ne ee 85
Warrialblemiallllastasiys tems save ln cl e=10sy= ie TC eyes cae ea en SS 286
Waseem, IDIGG). “<p oS wee ee a ee en ee ee eee ene = 39
WAMGUIP AVURUUE “2 ST sa Pe eek ae ee 1) Se es NT ae TER re seer Saye Ute 145
Vernon w) anes mane eee aii lye Ewe ed a er ls oO ee 625
VA CIGERUSEV.O) VA GEA | Vie ee ee ee ee ee eee 183
WACO ECS AVES INGR OIE Ea Ve es ee es ee 183
Wiewnonis, Gomieall aemylie AGHe ao 261
ier AGAUNEIOGGG “Aes Le. ee AY oR le eye eee er et Ree ee een. eR. Sad eee 260
DROVeLblessOlelasshan Goplas tl Cems ee et ee ae ee 259
RECommMendedudesioneandyseal Spas meee ee ae a ee ee ee eee 261, 262
RAGS eee ee ee ee ee a a ee oe eee 16
Wilsall, Aagealinoaiie 2, 5 Re = ak See ey es a Oe te eee Og eo ee ee 480
Wirneemt, C, eae ee ek oe Ue ee Oe a ee Oe ee ee ers 34
Wittne, Akyin “2.2 ee se eee ee oe 2 ee ese 44, 606
AUP OTOL AST EL ae ee ee ee) a ee Renee fe eens Se ee ee ee 85
VRDTERIG TE ok eS a a ee ge es ee Oe ge eee or See EE Te 64
Glasyera|sevoll ° 22 ae ee See, NS ea ee ee Se ee ee ee 237
Wol unm en (ire e) sinmnvey 1 OWLS ave In Cl es mene ee ae ee ee eee 450

Wakersteering 4 .~ 5 aaa ee ee ne ee st ee ane wg 388

Weal slinwlt) Ker — das eee roe ee a ere ne A 353
Wiel shi DO yit qetsrs Bane ewok i SVE Ws se so wes = I ae ee 39
Washingtony Navy eVierd eigen 5 a de a ee ee ee ee ee 234
Wiaterisenson pod). s 252k ete. ee Se ee eee 544
Watson: Walliainiws==2.. 92) 232 ee Se oe eee A 551
Weicht-and.volume.estimates! =e =. bie us 8 ee ee ee 279
Wieighit-to-displacementmratioi(W/D)— Sse ne ee eee 241
WAEEETESAIN DS USS et 6s 4 tra 1 woh ie eg oe a SU A ee 300
DVD ese Ea ep ee ot eo ee ee wD EI eG ee 595, 606
Winrets@lidiford faye ee 2 a ee a ee ee ee ee 9
Woodxinvpressunethulls: 2on222 9. 2) 8 es A I ee eee 250
WioodspitoleyOceanographiGs (i2ebess5 2 ee eee 8, 91
Wionthimo ton: Kai ee okt eee een a 2 ee 6, 519
AEA OT. cM Vag eo 8 ee ee eo ee ee 240
NASETE DONE BV ia ieee ee ee Sk As ee ee ee ee 10
VOMIURIndescribediie. 22 2— 3). eau ee es eee eee 239
YominrieshimbueNewspaper ee ed ee eee 240

762

ADDENDUM

The first proof print of this book was made in November 1974. Since then, the changes in vehicle
characteristics/components/instruments and their owners have been substantial. Probably the easiest
place to begin is with the purely mechanical corrections; these are:

Page 399—Contronex should read Controlex.

Page 399—PC-14 has been redesignated DIAPHUS, not TECHDIVER.

Page 615 and Fig. 12.31—Pelican Hook should read Standard Lift Hook.

Now, owing to the tremendous impact of offshore oil, i.e., the North Sea, on submersible
employment and a subsequent gain of knowledge on the author’s part, the following corrections and
comments are presented in order to provide a semblance of currency to the topic. The most logical
approach would seem to be chronologically chapter-by-chapter; this method will be followed.

Contemporary Submersible Development—I am indebted to Mr. Motoyoshi Hori of the Japanese
Marine Science and Technology Center (JAMSTEC), Yokosuka for supplying me information regarding
a 4-man submersible built at Taiwan in 1929 by Mr. Ichimatsu Nishimura. Mr. Nishimura was both
designer and funder of this submersible and a follow-on vehicle in 1935. The vehicles were equipped
with glass viewports and were built solely for fisheries research and undersea construction. The second
was used in search of the H.I.J.M. Submarine I-63 which sunk in a 1939 collision in the Bungo Suido.
While strong currents inhibited the vehicle’s effectiveness, the Imperial Japanese Navy recognized the
potential of these crafts and had two identical vehicles built for salvage-type operations, one of the
most noteworthy tasks being the search and investigation of the sunken battleship MUTSU near Kure
in 1943. According to Mr. Hori, these boats are quite distinct from the midget attack submarines of the
Imperial Japanese Navy and were intended for fishing and salvage purposes only. Briefly, the
characteristics of the third and fourth submersibles were:

Length: 12.8m

Beam: 1.85m

Draft: 1.80m

Displ.: 20 tons

Operating Depth: 200m

Power Source: Lead-acid batteries
Propulsion: 2 ea. 16 hp DC motors

From the point of view of modern deep submergence, I believe Mr. Nishimura’s 1929 vehicles to be
the first contemporary civilian submersible.

Manned Submersibles 1948-1974. Little would be gained by again reiterating the changes that have
and are taking place on individual vehicles and the field at large. Table 4.1 is as up to date as the
publisher will tolerate revisions. Still, some comments are in order to make this Table more accurate.

ARCHIMEDE—No longer operational; retired.

DEEP DIVER—No longer at Ft. Pierce, Fla.

DEEPSTAR 2000—Sold to GO International, Marseilles, France.

DEEPVIEW—Being refitted with a plastic bow dome.

DOWB—Being refitted with a plastic bow dome.

DSRV 1 & 2—Classed as operational.

GRIFFON—Operational.

MERMAID I/II—Refitted with plastic bow dome.

Pressure Hulls and Exostructures—Not mentioned as an active pressure hull material was fiber
reinforced plastic which constituted the entire pressure hull, ballast tanks and conning towers of the
SEA EXPLORER of Sea Line, Inc. A consistent trend in virtually all newly built vehicles is the
inclusion of a plastic bow dome in liew of separate viewports. Many of the older vehicles, as noted
above, have been or are being refitted with bow domes.

Life Support—Since the advent of PISCES III and the JOHNSON-SEA-LINK incidents, the life
support endurance on a great number of vehicles has increased by orders of magnitude. Vickers
Oceanics, Ltd. state at least 7 days/man; Northern Offshore, Ltd. 5 days/man; others have followed suit

763

to the point where most, but not all, supply at least 72 hours/man. There is a greater tendency towards
the use of LiOH as a COz scrubber, but in many cases it is carried in reserve rather than for normal
use, while baralyme or soda-sorb is used routinely. Because of the tremendous increase in life support
duration on individual vehicles, Table 14.6 should not be regarded as accurate.

Instruments—The majority of instrument development is concentrated on work tools rather than
scientific devices. This, quite naturally, reflects the nature of the work being performed and
anticipated. One of the more active service corporations is Vickers Oceanics, Ltd. A recent brochure of
theirs provides an indication of the direction in which work tools and developmental techniques are
proceeding; this list includes: Impact wrenches, drills, grinder/cutters, corers (hard rock), chainsaws,
guillotines (cutting hawsers, ropes, etc), mud pumps, stud guns, handwheel operators, wire brushing,
explosive holecutting, underwater non-destructive testing, reciprocating saws, underwater burning,
concrete chippers, and underwater welders. It is evident that engineering and work tools are coming of
age.

Safety Devices/Emergency Procedures—Changes in this area include not only increased life
support, but the appearance of releasable marker buoys that may be used for homing by rescuers; the
carrying of protective (i.e., thermal) clothing and underwater telephones with at least one carrier
frequency of 8.0875 kHz compatible with Navy UQC. Unfortunately, another submersible-related
tragedy occurred in early September 1975 with the STAR I. STAR IT is launched/retrieved with the
LRT system (p. 594) which requires the assistance of three ambient divers: 1 to control the LRT depth/
buoyancy and 2 to release/attach STAR II to the platform. While the incident is still to be fully
investigated and reported, it appears that depth control was either unattainable or misjudged, because
the sole surviving ambient diver recalls passing the 300 ft. level before he abandoned the LRT and
surfaced. The remaining two divers perished. STAR IT was released and surfaced safely. The incident
tragically demonstrates the systems concept of submersibles.

764

7 <<“ = - . - 7 : ~~
aE ee Cele eee tees

<

“Ba +